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There are 1372 search results for: K-band Planar and Low-profile Fabry-Perot Cavity Antenna with a Coupled Strip-Slitline Feed Structure
| Title: | On the Design of a Novel Fractal Antenna for Spectrum Sensing in Cognitive Radio |
| Abstract: | The present paper reports on the development of a novel compact fractal microstrip patch antenna for spectrum sensing in cognitive radio. The geometrical design of the proposed fractal antenna is optimized using nature inspired Moth Flame Optimization (MFO) method. The optimized antenna is having broadband characteristic within two bands (6.206 - 7.864 GHz, 23.56%) and (14.95 - 20 GHz, 28.89%), which are specified for IEEE C-band, Ku-band and K-band applications respectively. The proposed fractal antenna is also having high peak gain of 7.26 dBi at 18.04 GHz and omnidirectional radiation pattern at all frequencies. The performance of the proposed antenna is also validated experimentally by having a comparison of simulated results with the measured results. The proposed design offers 45.54% reduction in antenna physical size (copper required) as compare to a rectangular patch antenna of same size. |
| Author(s): | M. Aggarwal, A. P. S. Pharwaha |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1643 KB |
| Title: | K-band Planar and Low-profile Fabry-Perot Cavity Antenna with a Coupled Strip-Slitline Feed Structure |
| Abstract: | In this paper, a design of a planar, lowprofile, and high gain Fabry-Perot cavity antenna for Kband applications is presented. The antenna is consisted of a frequency selective surface (FSS) made of a circular hole array and a feeding structure made of a coupled strip-slitline. The FSS and the slitline both are lithographically patterned on a high permittivity substrate while the stripline is printed on top of a thin and low permittivity substrate. These two substrates are then closely appressed each other to form a planar structure. The measured results show that the proposed antenna has an impedance bandwidth of about 4% (|S11|?-10 dB), a maximum gain of about 10.4 dBi, and a 3-dB gain bandwidth of approximately 2.9% at the resonance frequency of around 20.8 GHz. The antenna’s compact, planar, and lightweight profile, i.e., approximately 4?o × 4?o × 0.24?o of a free-space wavelength at 21.0 GHz makes it promising for a small and efficient source in K-band applications. |
| Author(s): | H. H. Tran, T. K. Nguyen |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 6 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2166 KB |
| Title: | Design Optimization of a Dual-band Microstrip SIW Antenna using Differential Evolutionary Algorithm for X and K-Band Radar Applications |
| Abstract: | In this work, design optimization and fabrication of a high performance microstrip dual-band antenna are presented using Substrate Integrated Waveguide (SIW) technology with Roger 4350 (εr=3.48 and h=1.52mm). Firstly, the SIW antenna design is considered as a multi-objective multi-dimensional optimization problem for a simple microstrip geometry and its geometrical parameters are optimized efficiently using Differential Evolutionary Algorithm (DEA) in the 3D CST Microwave studio environment based on the gain and return loss characteristics at 12 GHz and 24 GHz. In the second step, for justification of the proposed design method, the optimally designed dual band microstrip SIW antenna has been prototyped. Furthermore, the experimental results are compared with the performance measures of other counterpart designs in literature. Thus, based on the obtained results and comparisons, it can be concluded that the proposed microstrip SIW antenna model and its optimization procedure, is a sufficient and low-cost solution for X and K band radar applications. |
| Author(s): | A. Belen, F. Gunes, P. Mahouti |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1409 KB |
| Title: | Design of Controlling Circuit for Varactor Diodes Based on K-band Pattern Reconfigurable Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 2-3-B Modeling, Design and Optimization of Modern Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 858 KB |
| Title: | CPW Dependent Loss Analysis of Capacitive Shunt RF MEMS Switch |
| Abstract: | CPW (CoPlanar Waveguide) plays major role in design of RF MEMS switch to improve the performance in terms of losses and required bandwidth of operation. This paper proposes the analyses of the mechanical characteristics on the electrical performance of the Capacitive Shunt RF MEMS (CSRM) switch based on various CPW structures and contact area roughness of the switch using electromagnetic 2.5D ADS simulator. The result of momentum method was analyzed up to the K-band frequency of 100 GHz. The result shows that the CSRM switch with two conductor CPW coupler has a maximum isolation of -46 dB with operating bandwidth up to 90 GHz at the resonant frequency of 50 GHz. In order to validate the obtained result, Artificial Neural Network (ANN) has been trained using ADS result. Comparison shows good agreement between ADS and ANN results. |
| Author(s): | S. Suganthi, K. Murugesan, S. Raghavan |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 4 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 468 KB |
| Title: | A Single-Layer Multi-Band Reflectarray Antenna in X/Ku/K-Bands |
| Abstract: | A new center-fed tri-band reflectarray antenna is presented in this paper. Elements of the reflectarray antenna are circular rings and patches loaded with slots. The proposed antenna operates in three bands (X, Ku and K). The introduced element, has been optimized to achieve large linear phase range at the three bands. Phase compensation is achieved by varying the size of elements. Height of the horn antenna has been optimized to get maximum gain and bandwidth at the three bands. |
| Author(s): | Z. Hamzavi-Zarghani, Z. Atlasbaf |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 5 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 562 KB |
| Title: | A Metallic 3D Printed K-Band Ridged Horn Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 2-3-C Advanced Manufacturing Technologies for Microwave Devices Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 530 KB |
| Title: | A K/Ka Dual-band Shared-Aperture Array Design |
| File Type: | Conference Paper |
| Issue: | Volume: 8-TP-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 269 KB |
| Title: | A K/Ka Dual-band Shared-Aperture Array Design |
| File Type: | Conference Paper |
| Issue: | Volume: 10-TE-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu III Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 269 KB |
| Title: | A K-band Spoof Surface Plasmon Polaritons Bandstop Filter with Capacitively Loaded Split-ring Resonator |
| Abstract: | A K-band bandstop filter based on the spoof surface plasmon polaritons (SPP) and the capacitively loaded split-ring resonator (RSS) is proposed in this paper. The capacitively loaded RSS consists of two parts: the traditional rectangle RSS and a T-type stub placed at the center of the arm microstrip line of the rectangle RSS. Thanks to the capacitively loaded RSS, the operating frequency of the resonator is reduced, which is helpful for miniaturizing the circuit size. The dispersion feature of the capacitively loaded RSS is studied by simulation and the geometrical parameters effects on the filter’s final performance are discussed. A K-band bandstop filter with spoof SPP and capacitively loaded RSS is designed, fabricated and measured to verify the proposed design methodology. The measured results show that the bandstop filter works at 21.05 GHz-22.95 GHz with more than 40 dB insertion loss. |
| Author(s): | P. Chen, L. Li, Z. Wang, K. Yang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 3 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1579 KB |
| Title: | A K-Band Low-cost Phase Shifter for Short-Range FMCW Radar Applications |
| File Type: | Conference Paper |
| Issue: | Volume: 3-MA-1 Advances in Phased Array Architectures and Beamforming Technology Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1429 KB |
| Title: | Wire Realization of a Tapered Slot Antenna with Reconfigurable Elements |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 504 KB |
| Title: | Wideband Planar Slot Antennas |
| File Type: | Newsletter Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 363 KB |
| Title: | Wideband Microstrip Patch Antenna at 7 GHz |
| File Type: | Conference Paper |
| Issue: | Volume: Student Microwave Design Projects with Sonnet Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 211 KB |
| Title: | Wideband Compact Antenna with Partially Radiating Coplanar Ground Plane |
| Abstract: | Many of today's portable communication applications require antennas that are compact, broadband, and easily integrable in a big variety of terminal geometries. This paper presents a compact wideband antenna with partially radiating coplanar ground plane. The prototype of the antenna shows a wide bandwidth (VSWR ? 2) of 92% (from 3.53GHz to 9.5GHz). The antenna also exhibits maximum gain of 3.5dBi and stable radiation patterns over the whole bandwidth. Nevertheless, in this paper the significance of the ground planes on the operating bandwidth are examined with the help of current distribution and discussed in detail with supporting parametric analysis. |
| Author(s): | A. T. Mobashsher, M. T. Islam, N. Misran |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 1 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 608 KB |
| Title: | Wideband Bow-Tie Slot Antennas with Tapered Tuning Stubs |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Computational Techniques for Antenna Design Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 113 KB |
| Title: | Wide Band Implantable Antenna Operating at MedRadio Band for MBAN Devices |
| File Type: | Conference Paper |
| Issue: | Volume: 1-4-D EM, Antennas and Wireless Power for Biomedical Applications Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 295 KB |
| Title: | Waveguides with Exceptional Points of Degeneracy of Order 2, 3, 4 and 6 without Loss and Gain |
| File Type: | Conference Paper |
| Issue: | Volume: S33 Complex Meta-Structures and Applications - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1967 KB |
| Title: | Vectorial GO and Diffraction Decomposition of Physical Optics Scattering of Dipole Wave from Planar Surfaces in Terms of Modified Edge Representation Line Integrals |
| File Type: | Conference Paper |
| Issue: | Volume: Asymptotic and High Frequency Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 467 KB |
| Title: | Validity of Approximate Boundary Conditions in Analysis of Strip-Loaded Planar and Curved Surfaces |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 286 KB |
| Title: | UWB Sampler for Wireless Communications and Radar |
| File Type: | Conference Paper |
| Issue: | Volume: Technologies for Ultra-Wideband Communication Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 167 KB |
| Title: | UWB Monopole Antenna with Compact Polygon-Shaped Patch for Portable Devices |
| Abstract: | In this paper, a small ultra wideband (UWB) antenna with co-planar waveguide (CPW) feed, consisting of a polygon-shaped design on the patch and a ground plane truncated with two mirror rectangular–shaped notches is designed for ultra wideband (UWB) applications. In this proposed antenna, through increasing the number of cuts inside the initial patch, a proper control on the upper frequency of the band can be achieved. The overall dimension of the antenna is 19×19 ×1 mm3 and fed by 50 ? coplanar waveguide. The proposed antenna is developed and its VSWR is compared with the simulated result. The proposed antenna operates in the adopted bandwidth (3.1 GHz-10.6 GHz) with VSWR < 2, and covers it very well from 3 GHz to 14.9 GHz, which provides fractional bandwidths of more than 132%. The effect of the ground plane notch on the optimization of the VSWR is discussed in detail. |
| Author(s): | T. Sedghi, V. Rafii, M. Moosazadeh |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 1 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 900 KB |
| Title: | UWB MIMO Antenna for High Speed Wireless Applications |
| Abstract: | The paper proposes a MIMO antenna composed of two elements in the form of UWB monopole antennas. Polarization diversity of the proposed antenna is obtained locating the two elements perpendicularly on a common substrate. Also the isolation between elements is accomplished without using any extra decoupling structures. The two monopoles antennas with half elliptical shape are fed with asymmetric coplanar strip (ACS). The presented antenna is located on substrate 48 × 28 mm2 in total size. The distance between the two elements is 15 mm that is 0.15λ0 at 3GHz. The antenna was designed to work effectively from 3 to 11.5 GHz with reflection coefficient better than -10 dB and isolation lower than 18 dB. In addition, antenna with elements located in parallel was designed to show the advantage of the original design. Envelope correlation coefficient, diversity gain and channel capacity loss document the antennas behavior. The antenna was fabricated and measured. Measurement validated the simulation and showed that the designed antenna can be well applied in UWB MIMO systems. |
| Author(s): | A. A. Ibrahim, J. Machac, R. M. Shubair |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1778 KB |
| Title: | USING THE FDTD METHOD TO MODEL THE REFLECTION COEFFICIENT OF A VIVALDI TAPERED SLOT ANTENNA FED THROUGH A PLANAR BALUN |
| Abstract: | In this paper, the Time-Domain (FDTD) method was used to determine the reflection coefficient vs. frequency of a Vivaldi Tapered Dual-Slot Antenna fed through a planar balun. The reflection coefficient at the input port of the feed stripline was determined through the separate computation of the reflection coefficient of representation of the antenna section and the scattering matrix of the balun, assuming that the electromagnetic coupling between these sections was negligible. Experimental results, which were obtained on a prototype of this structure, confirmed the validity of the proposed approach and demonstrate that the coupling of the model. [Vol. 12, No. 3 (1997), pp 26-30] |
| Author(s): | G. Biffi Gentili, R Braccini, M. Leoncini, G. Biffi Gentili, R Braccini, M. Leoncini |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 3 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 308 KB |
| Title: | Using Efficient Model-Based Parameter Estimation for Pole-Free Solutions of Modal Propagation Constants, as Applied to Shielded Planar Structures |
| Abstract: | A fast and efficient adaptive sampling algorithm is applied to model-based parameter estimation of a Method-of-Lines implementation of two- and three-layer shielded planar structures, creating a pole-free function for the calculation of the propagation constants. The technique minimizes the number of characteristic equation evaluations, and hence reduces the computation time by orders of magnitude when compared to methods using the characteristic equation directly. Examples of a shielded microstrip line and a finline structure are shown below. Between 3 and 15 evaluations of the characterisic function are typically required per determination of an imaginary or real zero. |
| Author(s): | Robert Lehmensiek, Petrie Meyer, Robert Lehmensiek, Petrie Meyer |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 1 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 910 KB |
| Title: | Use of MW Studio in the Implementation of Metamaterial Configurations in Planar Circuit Technology |
| File Type: | Conference Paper |
| Issue: | Volume: CST Modeling and Analysis Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 637 KB |
| Title: | Uniform Sampling Procedure for Constrained Surrogate Modeling of Antenna Structures |
| File Type: | Conference Paper |
| Issue: | Volume: S33 Electromagnetic Simulation for RF and Microwave Design Optimization Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 274 KB |
| Title: | Ultra-wideband Planar Log-periodic Slot Antenna with Exponential Shapes on Slot Edges |
| Abstract: | An improved method of using exponential curve shape on edges of log-periodic slots to decrease resonances and further reduce the antenna size is proposed. The proposed method is adopted to design a planar log-periodic slot antenna for ultra-wideband (UWB) applications. Numerical investigation shows that resonant frequencies can be decreased around 12.3% in low frequencies compared with the conventional planar log-periodic slot antenna with regular shape on edges of slots. Measured and simulated reflection coefficients and radiation patterns of the proposed antenna agree well with each other to demonstrate the validity. The measured |S11| shows that the operating frequency range (|S11| below -10 dB) is from 2.9 GHz to 11.36 GHz, covering the UWB spectrum (3.1 – 10.6 GHz). The proposed antenna has good radiation characteristics and antenna gains. The proposed antenna is a good candidate for the UWB applications. |
| Author(s): | W.-C. Weng, M.-C. Chang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1944 KB |
| Title: | Ultra-Wideband Planar Antennas: Slot vs. Monopole |
| File Type: | Conference Paper |
| Issue: | Volume: S44 EM Modeling Using FEKO I Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 624 KB |
| Title: | Ultra-Wideband Planar Antenna with Notched Bands at 3.5/5.5 GHz |
| Abstract: | In this paper, a microstrip planar antenna with notch bands at 3.5/5.5 GHz is proposed for ultra- wideband communication. An e-shape parasitic slit and an inverted C-shape slit are imprinted beneath the radiating patch to generate notch bands to suppress the interference from WiMAX and WLAN respectively. The experimental results confirmed that the fabricated prototype with a very small size has achieved an UWB operating band for VSWR ? 2 with two notched bands covering frequencies of 3.32 - 3.76 GHz and 5.2 - 5.92 GHz. The presented design achieved a good gain except at notched bands and exhibits stable omnidirectional radiation patterns. In this design, filter elements are embedded only on one side of the substrate without cutting any slot/s in the radiating element/ground plane and no modification of the patch or the ground plane is required which gives the proposed design an advantages over many designs reported for the same applications. |
| Author(s): | R. Azim, M. T. Islam |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 4 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 638 KB |
| Title: | Ultra-wideband Flexible Implantable Antenna for Wireless Capsule Endoscopy System with Performance Improvement |
| Abstract: | The implantable antenna is an important part of the wireless capsule endoscopy (WCE) system to achieve wireless communication. This paper designed an ultra-wideband flexible implantable antenna for wireless capsule endoscopy system. With a very wide bandwidth, the antenna can completely cover the industrial, scientific, and medical frequency bands (ISM, 2.4-2.48 GHz) and Wireless Medical Telemetry Service (WMTS, 1.395-1.4 GHz). The expanded size of the proposed antenna is 18mm× 10mm× 0.1mm. The conformal technology of the antenna has further reduced the space of the system and achieved miniaturization. The capsule antenna in this paper is a compact planar monopole antenna fed by a coplanar waveguide, and it uses a flexible material as a dielectric substrate to achieve the conformal shape of the antenna. U-shaped ground branch (UGB) and a loaded split ring resonator (SRR) structure were used to further improve the antenna performance. Simulation and measurement results were basically the same. On the premise of radiation safety and miniaturization of the antenna, the ultra-wideband operation of the antenna was realized. This antenna design provided reference value for the design and application of the capsule antenna. |
| Author(s): | Y. Feng, P. Chen, S. Pan, G. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 6 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1325 KB |
| Title: | Ultra-Wideband Bandpass Filter Based on Parallel-Coupled Microstrip Lines and Defected Ground Structure |
| Abstract: | A compact planar microstrip bandpass filter with 3.1 GHz ? 10.6 GHz bandwidth, below 1 dB in-band insertion loss, 0.2 ns ? 0.6 ns group delay and out-of-band rejection level better than - 10 dB is presented for ultra-wideband (UWB) applications. The desired UWB is realized by etching a defected ground structure (DGS) in the ground plane and loading a folded steppedimpedance stub by one of the coupling microstrip lines. This can offer two transmission zeros at lower and upper edges of the passband, which improve the passband selectivity and out-of-band rejection significantly. An equivalent lumped circuit model is introduced; the result of the circuit model fits the EM model well. The simulated and measured results are in good agreement |
| Author(s): | L. Yang, Y. Hongchun, W. Yawei, X. Shaoqiu |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1504 KB |
| Title: | Ultra-Wideband Antenna Performance Comparison |
| File Type: | Conference Paper |
| Issue: | Volume: S27 EM Modeling Using FEKO II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 746 KB |
| Title: | U-Shaped Microstrip Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 146 KB |
| Title: | Tunable Bandstop Filter Based on Split Ring Resonators Loaded Coplanar Waveguide |
| Abstract: | In this paper, a novel electrical tunable bandstop filter based on coplanar waveguide (CPW) loaded with split ring resonators (SRRs) is proposed. The unit cell of the bandstop filter is formed by etching single SRR on the CPW back substrate side, and the SRRs can be excited by the CPW slot’s magnetic field. Lumped equivalent circuit models are developed to analyze the frequency responses, and it shows that by loading the common cathode varactor diodes at the split region of the SRR outer ring, the resonant frequency of the bandstop filter can be electronically adjusted by tuning the reverse voltage of the varactor diodes. The prototype with overall size of 26.6 mm ? 50 mm ? 0.508 mm was designed and fabricated to validate the proposed structure. The measured tunable resonant frequency of the fabricated bandstop filter is from 2.19 GHz to 2.31 GHz while a reverse bias voltage is varying from 0 V to 30 V. It also shows that the -10 dB bandwidth is less than 45 MHz. |
| Author(s): | Q. Xiang, Q. Feng, X. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 7 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1138 KB |
| Title: | Triple-Band GCPW Rectifier for Harvesting EM Energy |
| File Type: | Conference Paper |
| Issue: | Volume: 3-3-D Wireless Power Transfer and Harvesting Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 383 KB |
| Title: | Triple Notch UWB Antenna Controlled by Novel Common Direction Pentagon Complementary Split Ring Resonators |
| Abstract: | A small-size CPW-feed multi-band planar monopole antenna is presented. A SwallowShaped-Patch (SSP) that covers the UltraWideband (UWB) frequency range is used in the proposed design. To create a multi-band antenna, several narrow pentagon slots, acting as resonance paths, can be integrated with the SSP antenna. Triple-band antennas are simulated and good results are obtained, while showing a very sharp band-rejection performance at 3.92 GHz, 5.34 GHz and 5.88 GHz, respectively. The antennas have omnidirectional and stable radiation patterns across all the relevant bands. Moreover, a prototype of the triple-band antenna is fabricated and measurement results are compared with simulation results. |
| Author(s): | B. Yan, D. Jiang, J. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 5 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 2155 KB |
| Title: | Triangular-Arranged Planar Multiple-Antenna for UWB-MIMO Applications |
| Abstract: | A triangular-arranged (TA) planar multiple-antenna is proposed. It consists of three ultra-wideband (UWB) planar monopole antenna elements, with the centers and the ports of the elements arranged at the vertexes of two regular triangles, thus the polarization of each element is 120° different. The performance of the TA multiple-antenna is investigated by simulation and measurement, and the measured results agree with the simulated ones in reasonable precision. Within the ultra-wide bandwidth of 3.4 GHz – 12 GHz, the return loss at each port is better than 10 dB, and the isolation between any two ports is higher than 20 dB. Furthermore, good omni-directional radiation pattern is obtained over the interesting frequency band. A linear-arranged (LA) threeelement multiple-antenna is compared with the proposed TA antenna. Comparison between the TA antenna and the LA antenna validates the advantages of the proposed one, which consequently is suitable for UWB-MIMO applications. |
| Author(s): | X.-S. Yang, S.-G. Qiu, J.-L. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 1 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 2389 KB |
| Title: | Transmission plane models for parallel-plane power distribution system and signal integrity analysis |
| File Type: | Conference Paper |
| Issue: | Volume: Applied CEM for EMC Applications Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 120 KB |
| Title: | TRANSMISSION AND REFLECTION CHARACTERISTICS OF A CLASS OF MODIFIED COPLANAR WAVEGUIDE STRUCTURES |
| Abstract: | In this paper, several geometries of a class of grounded coplanar waveguide (GCPW) are investigated using the finite difference time domain (FDTD) method, and their losses are computed. A uniform grounded coplanar waveguide (GCPW) structure is used as a reference case for the other non-uniform geometries. First, this reference case is studied. For this case, four geometries are proposed to study the transmission and loss effect of replacing parts of the dielectric substrate with free space. Afterwards, two new geometries are simulated to study the effect of introducing a neck and a gap in the microstrip feeding line, with and without a bridge that connects the two parts of the microstrip feeding line separated with the gap. The effect of adding a PEC cap above the microstrip feeding line, and connecting the two side ground planes, is also studied. The conductor attenuation is studied for the basic GCPW geometry. The power losses are also calculated for the uniform geometries. The line impedance is calculated for all geometries at several points. |
| Author(s): | Abdelnasser. A. Eldek, Atef. Z. Elsherbeni, Charles. E. Smith, Abdelnasser. A. Eldek, Atef. Z. Elsherbeni, Charles. E. Smith |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 2 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 378 KB |
| Title: | Transformer-Based Dual-Mode VCO for Multi-Mode Multi-Standard Receiver |
| Abstract: | The proposed VCO in this paper is used for multi-mode multi-standard wireless transceiver. The overall scheme includes two VCOs, each VCO adopts transformer-based structure. On-chip transformer which uses coplanar central tap structure and adopts the top metal winding is present. The primary and secondary inductances adopt octagon differential structure. Electromagnetic field (EM) simulation is carried out by using ADS Momentum. Negative conductance unit adopts the current reuse of cross coupled MOSFET. Oscillation mode can be chosen by switch. The primary and secondary inductances of the transformer are connected with 4 bit binary switches capacitor arrays and varactors under different oscillation modes to extend the range of frequency adjustment. Measurement results show that the frequency range is from 1.2 to 7.3 GHz and the phase noise at 1 MHz offset is less than -80 dBc/Hz in the whole frequency range. |
| Author(s): | X. Fan, X. Shi, L. Tang |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 8 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1698 KB |
| Title: | Toward Photonic Nanojet Imaging for Microscopy |
| File Type: | Conference Paper |
| Issue: | Volume: S22 Advanced Numerical Methods for Electromagnetic Analysis Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 427 KB |
| Title: | Time-Domain Magnetic Shielding of a Thin Conducting Screen Against a Small Loop |
| File Type: | Conference Paper |
| Issue: | Volume: S22 Advances on Time Domain Modeling and Design I Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 924 KB |
| Title: | Time-Domain Magnetic Shielding Effectiveness of Planar Stratified Shields |
| File Type: | Conference Paper |
| Issue: | Volume: S25 Time Domain Methods II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 221 KB |
| Title: | The Tilted-Ellipse Representation of Standing-Wave Patterns. |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in CEM Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 1221 KB |
| Title: | The Reduction of Force Component Produced by Short Sides by Analyzing the Corner of Coil in Planar Motor with Halbach Magnet Array |
| Abstract: | The planar motor with moving-magnet is purely levitated by the stator coils. The forces produced by coils are calculated with the analytical model of magnet array and coil surface model for applying to the real time control. Take the coil and the Halbach magnet array which is at 45 degree with the long side of coil for analysis. The force component produced by short sides can be eliminated for conveniently controlling when the length of coil takes certain dimension. In practice, the force component produced by short sides is small but not zero. There are two reasons, one is the higher harmonics and the other is the corner segments of coil. The force integral expressions of coil corner segments are given by the Lorenz force law. Then the forces numerically calculated with harmonic model and coil full model are verified by comparing with the magnetic surface charge model and finite element model. In order to reduce the force component produced by short sides, the different corners of coil are analyzed. Comparing the forces of different corners of coil, the force component produced by short sides can be significantly reduced with slightly change of the other force components. |
| Author(s): | G. Liu, S. Hou, W. Xiao |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 1 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1421 KB |
| Title: | The Planar E Multiple Arm Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D software I Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 581 KB |
| Title: | The Optimal Design of Real Time Control Precision of Planar Motor |
| Abstract: | In this paper, the Halbach permanent magnet array with 2 segments per pole is selected for analysis. The harmonics that the harmonic numbers for the lx and ly-direction in local coordinate system are equal to each other are set as a pair for transformation. Then the expressions of the magnetic flux density distribution of the Halbach array in global coordinate system are derived. The dimensions of the coil are parameterized. The force and torque exerted on the Halbach array by a coil are calculated by Lorentz force law. The first three harmonics are chosen for real time control by analyzing the ratio of each harmonic in the total harmonics. The harmonic model has good performance on torque by comparing with the models used before. As for the force, the errors can be significantly reduced by optimizing the parameterized dimensions of coil because of the cosine or sine form error figures. The optimized model has good precision on both force and torque. The same method can be applied on the Halbach permanent magnet array with different segments per pole. |
| Author(s): | G. Liu, Y. Wang, X. Xu, W. Ming, X. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 10 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2376 KB |
| Title: | The Joy of Computing with Volume Integrals: Foundations for Nondestructive Evaluation of Planar Layered Media |
| Abstract: | As an alternative to the finitedifference time-domain (FDTD), the finiteelement method (FEM), and the method of moments (MoM) based on the surface integral equation (SIE), a volume-integral equation (VIE) approach using the method of moments and conjugate-gradient methods is presented to address a wide variety of complex problems in computational electromagnetics. A formulation of the volume integral method is presented to efficiently address inhomogeneous regions in multi-layered media. Since volume element discretization is limited to local inhomogeneous regions, numerical solutions for many complex problems can be achieved more efficiently than FDTD, FEM, and MoM/SIE. This is the first of a series of papers dealing with volume-integral equations; in subsequent papers of this series we will apply volume-integrals to problems in the field on nondestructive evaluation. |
| Author(s): | H. A. Sabbagh, R. K. Murphy, E. H. Sabbagh, J. C. Aldrin, J. S. Knopp, M. P. Blodgett |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 9 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 837 KB |
| Title: | The Design of Planar Slot Arrays Revisited |
| Abstract: | Design procedures for planar waveguide slot arrays have been known and used for years, but the inexperienced designer is often faced with a number of practical problems when trying to implement them, especially in the case of larger arrays consisting of sub-arrays. Some helpful hints concerning the numerical implementation are provided. These include an effective procedure to avoid the necessity of good initial guesses for the unknown dimensions and recommendations for the subdivision of the nonlinear equations into smaller groups. Other practical aspects which are not explicitly defined elsewhere in the literature, are also addressed. |
| Author(s): | J.C. Coetzee, J. Joubert, J.C. Coetzee, J. Joubert |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 1 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 3222 KB |
| Title: | The Design of 276 GHz Triple-Push VCO Based on 65nm CMOS Process Using Slow-Wave Effect |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-C THz Antenna, Circuit and System Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 269 KB |
| Title: | The Design and Analysis of a Static and Extremely Low-Frequency Magnetic Field Stimulation Platform for Cell Prolifation Inhibition |
| File Type: | Conference Paper |
| Issue: | Volume: 1-SP-3 Advances in Electromagnetic Theory and Simulation Techniques I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 286 KB |
| Title: | The Application of Chirp Z-Transform in Fast Computation of Antenna Array Pattern |
| Abstract: | As an essential means of evaluating antenna array performance and the basis of antenna array design, numerical computation of antenna array pattern is very important. Computation of antenna array pattern by using straightforward summation is very time consuming especially for planar array with many elements. Moreover, in some applications such as antenna array synthesis, huge number of repeated pattern computations is needed that the consumed time is intolerably long. Although the computation can be accelerated by fast Fourier transform (FFT) when the elements are equally spaced by half of a wavelength because the array factor and the element excitation currents is a Fourier transform pair, in general, FFT is not applicable. In this paper, the chirp z-transform (CZT) is introduced to accurately and efficiently compute pattern of general linear or planar antenna arrays. Numerical examples confirm that CZT is flexible, efficient, and accurate. |
| Author(s): | C. Zhang, A. Qing, Y. Meng |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 11 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1910 KB |
| Title: | Terahertz High-Efficiency High-Gain Plate Antenna Array |
| File Type: | Conference Paper |
| Issue: | Volume: 1-4-B THz Antenna, Circuit and System Research in EHF Integrated System Lab. of UESTC Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Terahertz Dielectric Sensor Based on Novel Hexagon Meta-Atom Cluster |
| Abstract: | In this paper, we report meta-atom sensor based on planar hexagon split ring resonators. The subwavelength structure is designed to operate in terahertz frequency band. A modified version of split ring resonator geometry is simulated for sensing dielectric changes by placing thin dielectric layers as sample materials on the full frontal surface of sensor. The effective parameters are retrieved using Nicolson-Ross and Weir method. The meta-atom sensor shows significant changes in resonant frequency as a function of transmission (magnitude of S21 parameter) response, which was observed when the sensor is loaded with the dry layer of dielectric materials of different dielectric constants. This paper contributes new shape of metaatom structure used as a terahertz dielectric sensor. The proposed sensor can be used in multitudinous terahertz near field sensing applications. |
| Author(s): | N. Naeem, A. Ismail, A. R. H. Alhawari, M. A. Mahdi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 9 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 790 KB |
| Title: | Techniques to Improve Ultra Wide Band Performance of Planar Monopole Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Wideband Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 530 KB |
| Title: | TD-UAPO Solutions for the Diffraction by Co-Planar Adjacent Blocks |
| File Type: | Conference Paper |
| Issue: | Volume: S03 Algorithms for Unique Applications I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 570 KB |
| Title: | T-Shaped Broadband Dual Polarized Microstrip Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Projects in Sonnet Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 226 KB |
| Title: | Synthesis of Uniformly Excited Sparse Planar Array Based on Matrix Mapping and Genetic Algorithm |
| File Type: | Conference Paper |
| Issue: | Volume: 5-P-1 Poster Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 271 KB |
| Title: | Synthesis of Thinned Planar Arrays Using 0-1 Integer Linear Programming Method |
| Abstract: | This paper proposes a fast optimization method for synthesizing thinned planar antenna arrays. A 0-1 integer linear programming (ILP) model was proposed for the antenna array optimization. This model mainly aims to minimize the peak sidelobe level (PSLL) and consider the design requirements of narrow beamwidth and high directivity, finally obtaining the optimal distribution of the turned “ON” element positions in the aperture. Several cases of planar array designs with different aperture sizes and scan angles were provided in the paper and compared with other popular algorithms. Numerical results showed that the new method can effectively optimize the thinned planar arrays, including large-scale arrays, while significantly reducing the computational cost and time |
| Author(s): | M. Wang, X. Ping |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 2 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 726 KB |
| Title: | Surface Plasmon Resonance Based on Attenuated Total Reflection |
| File Type: | Conference Paper |
| Issue: | Volume: 1-SP-3 Advances in Electromagnetic Theory and Simulation Techniques I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 394 KB |
| Title: | Superformula-Based Compact UWB CPW-Fed-Patch Antenna With and Without Dual Frequency Notches |
| Abstract: | This paper presents two new designs of UWB coplanar waveguide (CPW)-fed-patch antennas operating in the FCC frequency band (3.1-10.6 GHz). The first design uses the superformula to produce a circular patch with sawtooth-like circumference. As compared to a regular circular patch antenna whose diameter is 25 mm, the proposed circular patch has a smaller diameter of 18.2 mm. Moreover, the proposed antenna covers the entire FCC band unlike a regular circular patch of the same radius. The second design introduces two frequency notches at 3.3-3.8 GHz (WiMAX) and 5-5.9 GHz (WLAN) using two arc shaped circular slots etched on the circular patch and a split-ring resonator (SRR) that is placed on the opposite side of the substrate. Measurements and simulations using HFSS show that the return loss is better than 10 dB across the band except at the two notch locations in Design II. Results are also presented for the radiation pattern and peak gain of both designs. Each of the proposed antennas has a compact size of 24 mm x 19 mm on a 1.5 mm Rogers Substrate (epsilon r=3.85). |
| Author(s): | A. A. Omar, S. Naser, M. I. Hussein, N. I. Dib, M. W. Rashad |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 11 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1949 KB |
| Title: | Super Ultra-Wideband Planar Antenna with Parasitic Notch and Frequency Selective Surface for Gain Enhancement |
| Abstract: | A compact Super ultra-wideband (SUW) antenna is discussed in this work. A rectangular radiator is modified into a tree-shaped structure with the defected partial ground to enhance the operating bandwidth. The novel rectangular parasitic with the circular slot is used as a notch in the ground plane which prevents the WLAN frequency. The proposed SUW antenna is achieving the 10 dB impedance bandwidth (IBW) from 3.5 GHz to 66.5 GHz frequency with a notched band varying from 5.0 GHz to 5.4 GHz. The bandwidth ratio (BDR) of the proposed SUW antenna is 1773.4 whereas the obtained bandwidth percentage (BW %) is 180. A modified SRR frequency selective surface (FSS) is designed for UWB application to improve the gain of the antenna. The compact unit cell of FSS is having electrical dimensions of 0.16λ0× 0.16λ0. The antenna achieves the maximum realized gain 9.46 dB when FSS is loaded as a superstrate and up to 5.2 dB gain enhancement is observed in the UWB frequency. |
| Author(s): | P. Jha, A. Kumar, A. De, R. K. Jain |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2093 KB |
| Title: | Substrate Integrated Waveguide-Fed Tapered Slot Antenna With Smooth Performance Characteristics Over an Ultra-Wide Bandwidth |
| Abstract: | We present an ultra-wide extended Kband (18 GHz – 30 GHz) planar linear tapered slot antenna (LTSA) design. From a parametric study involving eight designs, the best compromise LTSA is selected in terms of flattest gain and beam width and most symmetric beam width. The design is antipodal with alumina (?r = 10) substrate and fed with substrate integrated waveguide (SIW). Regular corrugations improve cross-polarization, input return loss, and gain. Numerical simulations use finite element analysis and time domain finite integration technique field solvers. The resulting design has half power beam widths (HPBW) of only ± 3.2° and ± 2.5° variation in frequency in the E- and H-planes, respectively. Cross-polarization levels at boresight are 35.7 dB at 18 GHz and 17.4 dB at 30 GHz, return loss is better than -11.7 dB and gain is 9.23 dB with ± 0.40 dB variation with frequency. Alternatively, for imaging systems requiring efficient illumination of a reflector or focusing elements, a second resulting design shows near-perfect beam symmetry with HPBWE/HPBWH = 0.91. These two LTSAs are good candidates for dual-polarization focal plane array feed applications in astronomy imaging. |
| Author(s): | L. S. Locke, J. Bornemann, S. Claude |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 5 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 988 KB |
| Title: | Study, Design and Fabrication of a CPW Fed Compact Monopole Antenna with Circular Polarization for Ultra Wide Band Systems Application |
| Abstract: | A compact circularly polarized square slot antenna (CPSSA) is presented in this paper, which is appropriate for UWB applications requiring high data rate transmission. This antenna operates across 2.8 GHz to 10.8 GHz with an impedance bandwidth (IBW) of 117.6% for VSWR less than or equal to 2. The antenna consists of a trapezoidal shaped radiation patch which is fed through a coplanar waveguide (CPW) and includes two inverted L-shaped ground arms at the two opposite corners of the slot to excite two orthogonal resonant modes for circular-polarization (CP) radiation. Furthermore, two square slits at the two other opposite corners of the slot are applied to enhance its IBW. The antenna exhibits CP bandwidth of 50.5% across 3.7 GHz-6.2 GHz, which is suitable for WLAN, WiMAX and C-bands. In addition, the antenna has a considerably compact volume of 25×25×0.8 mm3. The measured and simulated results confirm the usefulness of the antenna for practical applications. |
| Author(s): | M. Shokri, S. Asiaban, A. Amiri |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 9 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1746 KB |
| Title: | Study of MRI Transmit/Receive Coils for 7T/300 MHz Application |
| File Type: | Conference Paper |
| Issue: | Volume: S48 Computational EM in MRI Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1226 KB |
| Title: | Strongly Coupled Wireless Power Transfer With Conformal Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Wireless Powering of Devices and Energy Harvesting Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 1292 KB |
| Title: | Stacked Metamaterial Patch Antenna Made of Low Permittivity Dielectrics |
| Abstract: | A new concept of “meta-lo” architecture is contributed to build compact and broadband stacked metamaterial patch antennas (SMPAs). The new antennas are featured with planar mushroom metamaterials that are all made of low permittivity dielectrics. These metamaterials work as good alternatives to conventional high permittivity dielectrics, enabling the new antenna to resonate at a much lower frequency. To examine the antenna performances, one SMPA is experimentally demonstrated. The new antenna is observed to have a broad bandwidth of 27% in a volume of 0.26λ×0.26λ×0.107λ. The average antenna gain is 7.1 dBi in the operating bandwidth. The compact and broadband SMPA inspired by the meta-lo architecture is promising to be used in the high-speed mobile communications. |
| Author(s): | B. Zhang, X. Xu, X. Deng, Y. Wang, J. Wei |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 6 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 5047 KB |
| Title: | Splitting of Material Cells and Averaging Properties to Improve Accuracy of the FDTD Method at Interfaces |
| Abstract: | In this paper we present a simple modification to the traditional Finite Difference Time Domain (FDTD) method for treating material cells. The Yee cell is split into 8 smaller material subcells so that each E and H field point is considered to be located at the crosspoint of 8 cells with differing material properties. Thus there is no longer an overlap of the material cells associated with the components of the E and H fields. The 8 material properties are averaged at each crosspoint. Since the averaging is done outside the time marching loop there is little increase in the total computational time. Numerical results are shown for a sinusoidal plane wave scattering from a dielectric sphere. These results are compared with the exact Mie solution and the traditional material cell method along different cuts through the sphere. The splitting and averaging is shown to give improved amplitude accuracy in the vicinity of the sphere. Improvement is also observed at planar interfaces angled with respect to the grid. An additional benefit of this subcell formulation is that objects may be modeled with twice the geometrical resolution without increasing the size of the staggered grid. |
| Author(s): | R. S. Schechter, M. Kragalott, M. S. Kluskens, W. P. Pala, R. S. Schechter, M. Kragalott, M. S. Kluskens, W. P. Pala |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 3 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 277 KB |
| Title: | Spherical Conformal Bow-Tie Antenna for Ultra-Wide Band Microwave Imaging of Breast Cancer Tumor |
| Abstract: | In this paper, contribution of spherical conformal ultra-wide band (UWB) bow-tie antenna on enhancement of breast tumor detection capability of a radar-based microwave imaging system is investigated through simulation, demonstrating the potential of the novel antenna element used in a half-spherical antenna array surrounding the breast. The designed conformal antenna operates efficiently across the band from 1 GHz to 8 GHz, and it is immersed in a coupling medium in order to get a good impedance matching with the breast. Images are successfully formed by using delay-and-sum (DAS) algorithm for the detection of a spherical tumor model with 2 mm diameter. The tumor is located at 40 mm depth inside three different breast phantom models with homogeneous fatty breast tissue, quasiheterogeneous mix of fibro-glandular and fatty breast tissues and homogeneous fibro-glandular tissue, respectively. Fidelity factor, indicating the maximum cross correlation between observed and excitation pulses, of the conformal bow-tie is found to be around 13% more than that of the planar bow-tie at 40 mm depth. The use of the spherical conformal antenna presents an excellent solution to increase tumor responses by at least 2.3 dB, as well as to decrease mutual coupling effects between array elements, compared to the same system with planar bow-tie antennas |
| Author(s): | I. Unal, B. Turetken, C. Canbay |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 2 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 3108 KB |
| Title: | Space-Mapping-Enhanced Kriging Surrogates for Accurate Modeling of Microwave Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Optimization Methods for EM Applications Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 1037 KB |
| Title: | Space-Frequency Domain Iterative Method for Modes Analysis of Planar Waveguides |
| Abstract: | We describe a space-frequency domain iterative algorithm to analyze the modes of planar optical waveguides. The one dimensional Maxwell equation was transformed into space-frequency domain by Fourier transform, and became an integral equation which could be solved by an iterative method. For any refractive index profiles, the effective index and mode field distribution are given simultaneously. The numerical result shows that this method is accurate and flexible for planar optical waveguides with any structure. |
| Author(s): | L. Bingxin, Z. Baorong |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 8 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 353 KB |
| Title: | Sonnet Modeling and Simulation of Wilkinson Power Divider with OhmegaPly Resistor |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulations using Sonnet Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 364 KB |
| Title: | Sonnet in RF Power Amplifier Design |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulations using Sonnet Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 112 KB |
| Title: | Sonnet in Directional Coupler Design |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulations using Sonnet Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 151 KB |
| Title: | Solid Characterization Utilizing Planar Microwave Resonator Sensor |
| Abstract: | This paper outlines the design and the implementation of a planar microwave resonator sensor for sensing application using the perturbation concept in which the dielectric characteristics of the resonator influence the quality factor (QF) and the resonance frequency. The designed sensor is fabricated using Roger 5880, and it is operating at 2.27 GHz in ranges of 1-3 GHz for testing solid materials. In addition, applying a specific experimental methodology, practical material is used as material samples such as those in Roger 5880, Roger 4350, and FR4. To investigate the microwave resonator sensor performance, an equivalent circuit model (ECM) is introduced. The proposed sensor has achieved a narrow bandwidth and high QF value of 240 at an operating frequency of 2.27GHz. Besides, the sensitivity and accuracy of the sensor is more than 80%, which makes this sensor an excellent solution to characterize the material, especially in discovering the material characteristics and quality. |
| Author(s): | A. J. A. Al-Gburi, Z. Zakaria, I. M. Ibrahim, R. S. Aswir, S. Alam |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 2 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1984 KB |
| Title: | Small Square-Shaped Slot Antenna for Wearable Passive UHF RFID Tags |
| File Type: | Conference Paper |
| Issue: | Volume: 3-2-B RFID Antennas and Systems Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 254 KB |
| Title: | Slotted Waveguide Transitions for Spatial Power Combining |
| File Type: | Conference Paper |
| Issue: | Volume: Posters Session 2 Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 136 KB |
| Title: | SIW Rotman Lens with Planar Slot Array Antenna at Ku-band |
| Abstract: | A multi-beam antenna, which is the combination of a Rotman lens and a planar slot array antenna, is designed in this paper. The lens and the slot array are designed for 15.5 to 16.5 GHz frequency range and implemented in the same substrate using SIW structure. The Rotman lens with 7 input ports and 7 output ports are connected to a planar slotted array antenna with 7 waveguides. This multi-beam antenna consists of seven beams at angles of 0°, ±10°, ±20° and ±30° symmetrically. This antenna is designed for terrestrial and satellite applications, where the low cost, low profile and light multi-beam antennas are needed. Simulated and measured results show that the amplitude and phase distributions and scattering parameters of the antenna are in good agreement. In addition, the SLL, HPBW, main beam direction and cross polarization levels of all the radiation patterns are desirable. |
| Author(s): | S. A. Hosseini, Z. H. Firouzeh, M. Maddahali |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 6 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2116 KB |
| Title: | SIW like Bull-Eye Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S04 Printed, Flexible and Reconfigurable Antenna Implementations Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 464 KB |
| Title: | SIW Circularly-Polarized Filtering Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 1-P1-A Student Paper Contest Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 611 KB |
| Title: | Single-cut Far-Field Antenna Radiation Pattern Reconstruction Accuracy Analysis in Compact Anechoic Chamber Setup |
| Abstract: | In production testing, it is of importance to measure the key radiation parameters of an antenna under test (AUT), e.g., main beam peak and direction, sidelobes, and null depth and direction in a cost-effective setup with a short measurement time. As a result, practical measurement setups are often compact and equipped with only a few probes (or probe locations). However, these system limitations would introduce errors for antenna testing. This problem has become even more pronounced for 5G radios due to utilization of large-scale antenna configurations and high frequency bands. Spherical near-field measurements are nowadays an accurate and mature technique for characterizing AUTs, which however, necessitates a full spherical acquisition, leading to a long measurement time. Singlecut near-to-far-field transformation is a promising strategy since most of the key AUT parameters are available in the single-cut pattern and it requires much reduced measurement time. In this work, a simple and flexible scheme is proposed to evaluate errors introduced by limitations in practical setups for single-cut far-field (FF) antenna radiation pattern reconstruction, where the near-field data can be easily generated and modified according to the limitations introduced in practical multi-probe anechoic chamber setups, e.g., measurement distance, truncation range, and sampling interval. The reconstructed FF pattern is obtained using a commercial near-field to far-field transformation tool, SNIFT. The proposed scheme is numerically validated via comparing the reference FF pattern of a 4 × 8 uniform planar array composed of ideal Hertzian dipoles and reconstructed FF pattern. With the proposed scheme, the impact of practical system limitations on single-cut reconstruction accuracy can be easily analyzed. |
| Author(s): | O. K. Jensen, Y. Ji, F. Zhang, W. Fan |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 9 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2662 KB |
| Title: | Single-, Dual- and Wide-Band Frequency-Reconfigurable Antenna with Annular Ring Slots |
| Abstract: | This paper presents a frequency reconfigurable antenna enabled using a pair of annular ring slots on a coplanar waveguide (CPW) ground plane. Its initial wideband operation mode from 3 GHz to 6 GHz can be reconfigured into six additional modes: a dual–band mode and five single-band modes, with minimum reflection coefficients (S11) of -10 dB. For demonstration and proof-of-concept purposes, metal switches have been used to represent the switches in simulations and measurements. The ON state is emulated using shorted metal switches, whereas the OFF state is emulated using an open. Good agreements are indicated for simulated and measured S11 and radiation patterns. |
| Author(s): | M. C. Lim, S. K. A. Rahim, M. R. Hamid, P. J. Soh, M. I. Sabran, A. A. Eteng, M. R. Ramli |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 11 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2128 KB |
| Title: | Single Layer Vivaldi Antenna Feed Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: S35 EM Modeling Using FEKO II Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 425 KB |
| Title: | Simulation-Driven Design of Microstrip-to-CPW Transitions Using Variable-Fidelity EM Models |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic-Simulation-Driven-Design: Modeling and Optimization Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 376 KB |
| Title: | Simulation of Compact Electromagnetic Bandgap Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Artificial Material for Electromagnetic Applications Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 198 KB |
| Title: | Simulation of Coherent Remission in Planar Disordered Medium |
| File Type: | Conference Paper |
| Issue: | Volume: S33 Advanced Modeling of Disordered and Topological Systems - I Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 257 KB |
| Title: | Simulation and Design of Multiband Koch Fractal CPS Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: S24 Wideband and Multiband Antenna Modeling and Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 525 KB |
| Title: | Simulating Bondpads Using the Sonnet EM Simulator |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using Sonnet - I Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 144 KB |
| Title: | Simple and Compact Dual Band-Notched Monopole Antenna Using U-Shaped Forms on the Conductor-backed Plane for UWB Applications |
| Abstract: | A planar ultra-wideband antenna with dual band-notched characteristics is proposed. The main features of the proposed antenna are the extremely compact dimensions and band-notched characteristics that are obtained without modifying the radiator. The dual band-notched characteristics are achieved by a pair of mirror U-shaped slots and an inverted U-shaped slot at the conductorbacked plane. The measured results of the manufactured (15 mm × 15 mm) antenna on 1.6 mm FR4 substrate show that the antenna operates with VSWR less than two over the frequency band from 3 GHz to 11.2 GHz. That wideband is featured by the existence of two notched bands VSWR is more than five aimed at suppressing any interference from IEEE802.11a WLAN 5 GHz (5.15 GHz - 5.825 GHz) and ITU 8 GHz (8.025 GHz - 8.4 GHz) band. The antenna has a desirable VSWR level, radiation pattern, and gain characteristics for ultra wideband frequency band range. |
| Author(s): | M. Moosazadeh, Z. Esmati |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 11 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 2656 KB |
| Title: | SigrityX: Fast and Accurate PI/SI Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: S23 Electromagnetic Modeling for Electronic Design Automation Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 362 KB |
| Title: | Shielding Effectiveness of Finite Width Shields Against Low-impedance Magnetic Near-field Sources |
| File Type: | Conference Paper |
| Issue: | Volume: S35 Low Frequency Computational Electromagnetics I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1053 KB |
| Title: | Shaped-Beam Circularly-Polarized Practical Antenna Array for Land Imaging SAR Systems |
| Abstract: | A planar array of M × N circularly polarized microstrip patch antennas is proposed for high resolution land-imaging applications using an airborne side-looking Synthetic Aperture Radar (SAR) systems. The microstrip patch is designed to produce either right-hand or lefthand circular polarization. The planar array is designed to produce a circularly polarized three-dimensional beam of cosecant-squared shape in the range direction and uniform shape in the azimuth direction. The mutual coupling between the adjacent patches in the proposed array is studied for the assessment of the final array design and is shown to have no bad effects on the resulting beam shape or the array performance. A computationally efficient Particle Swarm Optimization (PSO) algorithm is developed and applied to find the amplitude and phase distributions of the feeding voltages over the planar array elements required to produce the desired radiation patterns. This technique is achieved by developing a fast algorithm to extend the amplitudes and phases calculated for M-element and N-element linear arrays to be applied to the elements of a two-dimensional M × N planar array without the need to apply the PSO to calculate the amplitudes and phases for the entire elements of the planar array. A perfect three-dimensional pattern with the desired shapes in both azimuth and range directions is achieved. The input impedance, the axial ratio and the shapes of the radiation patterns produced by the proposed antenna array are investigated and shown to be satisfactory over the frequency band of 3.91 − 4.11 GHz. |
| Author(s): | M. A. El-Hassan, K. F. A. Hussein, A. E. Farahat, K. H. Awadalla |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2032 KB |
| Title: | Sensor Selection via Convex Optimization in Remote Contact-free Measurement of Currents |
| File Type: | Conference Paper |
| Issue: | Volume: S38 Low-Frequency Electromagnetic Inverse Problems I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 440 KB |
| Title: | Self-Inductance of an Extrusion of a Planar Curve |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Modeling and Applications – II Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 388 KB |
| Title: | Selection of New Features in the Electromagnetic Solution Kernel of FEKO Suite 6.0 |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 576 KB |
| Title: | SDR Based Modulation Performance of RF Signal under Different Communication Channel |
| Abstract: | Hardware components are an integral part of Hardware Define Radio (HDR) for seamless operations and optimal performance. On the other hand, Software Define Radio (SDR) is a program that does not rely on any hardware components for its performance. Both of the latter radio programmers utilize modulation functions to make their core components from signal processing viewpoint. The following paper concentrates on SDR based modulation and their performance under different modulations. The bit error rate (BER) of modulations such as PSK, QAM, and PSAM were used as indicators to test channel quality estimation in planar Rayleigh fading. Though it is not commonly used for channel fading, the method of the adder determines the regionally segmented channel fading. Thus, the estimation error of the channel change substantially reduces the performance of the signal, hence, proving to be an effective option. Moreover, this paper also elaborates that BER is calculated as a function of the sample size (signal length) with an average of 20 decibels. Consequently, the size of the results for different modulation schemes has been explored. The analytical results through derivations have been verified through computer simulation. The results focused on parameters of amplitude estimation error for 1dB reduction in the average signal-to-noise ratio, while the combined amplitude deviation estimation error results are obtained for a 3.5 dB reduction. |
| Author(s): | S. Habib |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 8 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2204 KB |
| Title: | SAR Induced by Low and High Directivity Antenna Apertures at Distances Greater than 25 mm from the Body |
| Abstract: | A comprehensive SAR study of low and high directivity antennas operated at distances greater than 25 mm but less than 200 mm from a large homogeneous elliptical phantom is presented. The study considers antennas, such as dipoles, monopoles, planar inverted-F antennas (PIFAs), IFAs, patches, patch arrays, and dipole arrays. SAR estimation methods for low directivity antennas for both near and far field conditions are proposed and elucidated. For directive antennas and arrays radiating directly towards the phantom interesting phenomena are observed that require more detailed investigation |
| Author(s): | A. B. Mazady, G. Schmid, R. Uberbacher, M. Ali |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 9 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 958 KB |
| Title: | SAR and Diversity Performance of Wireless Handheld Devices with Dual Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling of Biomedical Problems - 2 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 247 KB |
| Title: | S-Slot Dual-Fed Tri-Band Square Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | S-Slot Dual-Fed Tri-Band Square Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 467 KB |
| Title: | S-parameter Sensitivity Analysis of Planar Antennas using Self-adjoint Approach with the Method of Moments |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic-Simulation-Driven-Design: Modeling and Optimization Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 329 KB |
| Title: | Rotman Lens Amplitude, Phase, and Pattern Evaluations by Measurements and Full Wave Simulations |
| Abstract: | Microwave lens’ performance is depicted by several parameters such as phase error, amplitude taper, and array scan pattern etc. For decades, these parameters have been estimated by the geometry optics method that does not capture the mutual couplings within the lens geometry. Full wave simulation toolkits to conduct EM prediction are now available. However, using them to synthesize and optimize the electrical performance of Rotman lens is still relatively new. Several microwave lens full wave simulations have been attempted using different methods, such as FDTD, FEM, and FIT. They were reported from the perspectives of either phase or amplitude predictions at a single port or single frequency. However, the lens properties at multiple frequencies and for multiple beam ports using MoM have not been investigated. In this paper, we address such simulations using the planar Green’s function in FEKO. The phase, amplitude and array factor across the frequency band for multiple beam ports are compared with the measured results, and their errors are evaluated. Prominent agreement between FEKO and measurement is demonstrated. The performance of a prototype lens is presented, followed by discussing few future aspects of lens optimization using full wave simulations. |
| Author(s): | J. Dong, A. I. Zaghloul, R. Sun, C. J. Reddy, S. J. Weiss |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 6 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 1200 KB |
| Title: | Roof Shaped Rectangular Slotted Patch Antenna at 18.3 GHz |
| File Type: | Conference Paper |
| Issue: | Volume: S57 Design Simulation and Build Microwave Devices using Sonnet Suites Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 575 KB |
| Title: | Role of Surface Geometric Patterns and Parameters in the Dispersion Relations of Spoof Surface Plasmon Polaritons at Microwave Frequency |
| Abstract: | Spoof surface plasmon polaritons (SSPPs) can be excited using geometric shapes on conducting surfaces in microwave (MW) regime. They are eminent as compared to the conventional microstrip (MS) transmission lines, due to their better efficiency and compactness in high density and high-speed circuitry. In this work, we compare normalized dispersion curves (DCs) of different groove shapes engineered on the planar metallic strip with the variation of geometric parameters of the structure, which are obtained by Eigen-mode solver of ANSYS’s HFSS. It is found the dispersion characteristics are determined by the shape and the asymptotic frequency can finely be tuned through the geometric parameters. All DCs deviate further from the light line indicating slow propagation of SSPPS. The performance of rectangular grooves is clearly outstanding; however, the circular grooves behave comparably better than Vee-groove. Further, a low pass plasmonic filter has been proposed with semicircular gradient subwavelength grooves designed on a planar metallic strip with transition sections to match both the impedance and momentum of MS line and the plasmonic waveguide. Results of S-parameters and magnitude of electric field distributions show excellent transmission efficiency from fast guided wave to slow SSPPs. It is also observed that the confinement of such surface waves is dependent on the geometric parameters which can be useful in plasmonic structure engineering and fine-tuning the cutoff frequencies, hence posing a new prospect for advanced plasmonic integrated devices and circuits. |
| Author(s): | R. S. Anwar, L. Mao, H. Ning |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 1 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2035 KB |
| Title: | Roger Harrington and Shielded Planar Microwave Electromagnetic Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: S36 Celebrating 50th Anniversary of Field Computation by Moment Methods Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 392 KB |
| Title: | Robust Numerical Modeling of Currents Radiating in Non-Birefringent Anisotropic Medium Layers |
| File Type: | Conference Paper |
| Issue: | Volume: S09 Integral Equation Methods and Applications I Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 667 KB |
| Title: | Robust Numerical Modeling of Currents Radiating in Non-Birefringent Anisotropic Medium Layers |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Student Paper Competition I Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 667 KB |
| Title: | Robust Feed Modeling of the Asymmetric Planar Mesh Dipole-Type Antenna |
| Abstract: | This paper explores the feed method for the asymmetric planar XY-mesh dipole-type antenna and the modifications needed to prevent its exploitation by automated genetic algorithm (GA) optimization for the application of RFID tag antennas, where the antenna is optimized to the conjugate of the chip impedance. By removing certain feed parameters from the GA optimization and instead making them wavelength dependent, the goal of creating robust models which achieve accurate and matching results between various electromagnetic (EM) simulators, with a focus on the WIPL-D and Axiem EM simulators, was achieved. |
| Author(s): | J. Rayno, D. S. Linden |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1193 KB |
| Title: | Robust Feed Modeling of the Asymmetric Planar Mesh Dipole-Type Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Advances in Electromagnetic Modeling by WIPL-D I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 271 KB |
| Title: | Robust Cubature Methodology for Spectral Integrals |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Advanced Computational Techniques in Electromagnetics Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 1727 KB |
| Title: | Reliable Design Optimization of FEKO-Simulated Microwave Structures Using Manifold Mapping |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using FEKO II Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 630 KB |
| Title: | Reflection compensation scheme for the efficient and accurate computation of waveguide discontinuities in photonic crystals |
| Abstract: | Abstract—We presented a novel method for the accurate and efficient computation of the reflection and transmission coefficients of waveguide discontinuities within planar photonic crystals (PhCs). This method proposes a novel kind of field source that optimally excites the dominant waveguide mode and mimics procedures that are typically used for the measurement of reflection coefficients. This technique may be applied to arbitrary field simulators working in the frequency domain. The presented reflection compensation scheme is elucidated along the Method of Auxiliary Sources (MAS). In order to verify the results, we compare two test cases with the rigorous connection technique provided by the Multiple Multipole Method (MMP). |
| Author(s): | D. Karkashadze, R. Zaridze , A. Bijamov, D. Karkashadze, R. Zaridze , A. Bijamov |
| File Type: | Journal Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 1069 KB |
| Title: | Reflectarray And Space Fed Microstrip Antenna Arrays |
| File Type: | Conference Paper |
| Issue: | Volume: Analysis and Design of Reflectarrays Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 151 KB |
| Title: | Reduction of Singular Surface Integrals of Tensor Green Function to Non-Singular Line Integrals in Integral Equations for Planar Geometries |
| File Type: | Conference Paper |
| Issue: | Volume: S26 Integral Equation Methods and Applications IV Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Reducing Power Coupling Loss between Laser Diodes and Planar Optical Waveguides by Using Tapers |
| File Type: | Conference Paper |
| Issue: | Volume: Guided Waves in Non-Standard Media Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 96 KB |
| Title: | Reconstruction of the Antenna Far-Field Pattern through a Fast Plane-Polar Scanning |
| Abstract: | This paper provides the experimental validation of a fast and accurate technique, which allows the reconstruction of the antenna radiation pattern from a minimum number of near-field measurements collected through a plane-polar scanning. This near-field to far-field (NFTFF) transformation technique relies on a nonredundant sampling representation of the voltage acquired by the probe, achieved by modeling the antenna with a double bowl, a very flexible model particularly suitable to deal with antennas having a quasi-planar geometry. The NF data required by the standard plane-rectangular NFTFF transformation are efficiently reconstructed from the nonredundant plane-polar ones by using an optimal sampling interpolation algorithm, thus making possible to get a considerable measurement time saving. The accuracy and practical efficacy of the described technique are assessed by experimental tests carried out at the Antenna Characterization Lab of the University of Salerno. |
| Author(s): | F. D'Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 12 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1998 KB |
| Title: | Reconfigurable Planar Monopole Antenna for Fifth-Generation Mobile Communication System |
| Abstract: | A frequency reconfigurable planar monopole antenna for fifth-generation (5G) mobile communication terminal equipment is presented. The proposed antenna uses a meandered monopole, branch resonance and other techniques to make the antenna resonant in multiple frequency bands. The antenna is compact in size (115 mm × 55 mm × 0.8 mm) and has a longitudinal length less than one-tenth of the resonant wavelength (working at 1.79 GHz). The pin diode is designed between the planar meandered monopole antenna and branch. The current path of the highfrequency current on the antenna can be easily controlled by controlling the DC bias voltage of the diode, and the operating frequency of the antenna is switched between three frequency bands. The antenna is fed directly through a 50 Ω matched transmission line. The measured data of the antenna in the anechoic chamber show good consistency with simulation data. The radiation pattern of the antenna shows good omnidirectional characteristics and good frequency characteristics, with a maximum radiation gain of 13.6 dBi. Experimental results demonstrate that the antenna can meet the design requirements of 5G communication. |
| Author(s): | P. Chen, L. Wang, Z. Ma |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 1 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1572 KB |
| Title: | Reconfigurable 2×1 CPW-Fed Rectangular Slot Antenna Array (RSAA) Based on Graphene for Wireless Communications |
| Abstract: | This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λo×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications . |
| Author(s): | D. M. Elsheakh, O. M. Dardeer |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 6 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1678 KB |
| Title: | Realization of High-gain Circularly Polarized Planar Lens Antenna with Beam Steering Capability |
| File Type: | Conference Paper |
| Issue: | Volume: 3-MA-6 Metamaterial based Antennas and Broadband Antennas Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1150 KB |
| Title: | Rapid Prototyping of Nanoslit Lenses |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in CEM Applications I Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 1473 KB |
| Title: | Radiation Pattern Synthesis and Mutual Coupling Compensation in Spherical Conformal Array Antennas |
| Abstract: | This paper presents a novel technique based on Hybrid Spatial Distance Reduction Algorithm (HSDRA), to compensate the effects of deformity and mutual coupling occurred due to surface change in conformal arrays. This antenna surface deformation shifts the position of null points and loss of the main beam resulting in reduced antenna gain along with substantial undesirable effects on the antenna performance. The proposed algorithm, which cumulatively incorporates the Linearly Constraint Least Square Optimization (LCLSO) and Quadratically Constraint Least Square Optimization (QCLSO) techniques, is formulated to minimize/reduce the absolute distance between the actual (simulated/measured) radiation pattern and the desired radiation pattern while keeping the direction of mainbeam and nulls position under control. In particular, a 4x4 conformal microstrip phased array from planar surface is deformed to prescribe spherical-shape surface with various radii of curvature, is validated. For the enhancement of Gain of the conformal array antenna, Gain Maximization Algorithm is also proposed, the simulated results of which is compared to the traditional Phase compensation technique and unconstraint least squares optimization. The analytical results for both planar and spherical deformed configurations are first evaluated in MATLAB and then validated through Computer Simulation Technology (CST). |
| Author(s): | T. A. Khan, M. I. Khattak, A. Tariq |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 6 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1941 KB |
| Title: | Radiation Pattern of a Networks Antenna Supplied with Butler Matrix, Comparison with a Multi-layer Structure |
| File Type: | Conference Paper |
| Issue: | Volume: Analysis and Design of Antennas for Wireless Communications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 387 KB |
| Title: | Radiation From A Large Circular Loop Around A Dielectric Coated Conducting Sphere |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Session Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 130 KB |
| Title: | Quad-Band Lamp-Shaped Antenna at 43 Ghz |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 725 KB |
| Title: | Proximity Effect of UWB U-Slot Patch Antenna on Human Body |
| File Type: | Conference Paper |
| Issue: | Volume: S33 Antenna Systems and Applications Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 492 KB |
| Title: | Printed Cross-Slot Wideband Conformal Antenna for GPS Application |
| Abstract: | A novel cross-slot printed wideband conformal antenna is proposed for GPS application. Initially a planar antenna with cross-slot is designed at a slightly higher frequency and then the planar antenna is transformed to the corresponding cylindrical conformal antenna with the desired radius of curvature. The combination of partial ground plane and cross-slot on patch are used for bandwidth enhancement. The proposed conformal antenna exhibits a fractional bandwidth (for the definition of -10dB) of 79.28% operating from 1091 to 2524 MHz, which is suitable for all GPS bands, GLONASS and GALILEO applications. The radiation pattern exhibits an omnidirectional pattern and gain of proposed conformal antenna is 2.37 to 5.33dBi within operating frequency range. |
| Author(s): | R. Sahoo, D. Vakula, N. Sarma |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 10 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2459 KB |
| Title: | Preconditioned GIFFT: A Fast MoM Solver for Large Arrays of Printed Antennas |
| Abstract: | Abstract— A new type of fast method of moments (MoM) solution scheme using standard basis functions for large arrays with arbitrary contours and/or missing elements is applied to array antennas in a layered configuration. The efficiency of the method relies on use of the FFT along with approximating the Green’s function as a separable sum of interpolation functions defined on a relatively sparse, uniform grid. The method is ideally suited for solving array problems, and its effectiveness is demonstrated here for planar arrays of printed antennas. Both fill and solve times, as well as memory requirements, are dramatically improved with respect to standard MoM solvers. |
| Author(s): | B. J. Fasenfest, F. Capolino, D. R. Wilton, B. J. Fasenfest, F. Capolino, D. R. Wilton |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 3 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 398 KB |
| Title: | Practical CEMist "Current Vector Alignment and Lowered Resoance in Small Planar HF Wire Antenna Designs |
| File Type: | Newsletter Paper |
| Issue: | Volume: 20 Number: 1 Year: 2005 |
| Download Link: | Click here to download PDF File Size: 817 KB |
| Title: | Powering Sensors in IoT System by Using Compact Seven Band PIFA Rectenna |
| Abstract: | A compact seven band coplanar waveguide fed planar inverted F antenna (PIFA) is presented. The proposed antenna is designed to harvest the ambient radio frequency energy at GSM 900, GSM 1800, LTE band 11 and 7, UMTS 2100, Wi-Fi 2.4, LTE and WIMAX 5.2. The antenna is simulated using 3D electromagnetic simulators CST and HFSS. Moreover, the antenna is fabricated and it is used to measure the indoor RF spectrum in Egypt. A simple AC to DC converter unit is designed by using HSMS 2850 Schottky diode to convert the collected RF energy to DC energy. The antenna and the AC to DC converter are integrated to form the RF energy harvesting system. The maximum measured efficiency obtained at 2.4 GHz is about 63.7%. |
| Author(s): | N. A. Eltresy, D. M. Elsheakh, E. A. Abdallah, H. M. Elhennawy |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 12 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2516 KB |
| Title: | Planar Ultra-Wideband (UWB) Antenna with C-Band Rejection Using Self-Complementary Structures |
| Abstract: | In this paper, we describe an application of the Self-Complementary Structures (SCS) to design a low-profile UWB monopole antenna with band-notched function. The proposed antenna consists of a square radiating patch with a rotated Z-shaped slot, a ground plane with a rectangular slot and rotated Z-shaped parasitic structure inside slot; which provides a wide usable fractional bandwidth of more than 125% (2.81- 12.63 GHz), with band-notched function around 3.7-4.2 GHz, to avoid interference from C-band communications. In the presented antenna, by using a rotated Z-shaped parasitic structure inside the rectangular slot in the ground plane, additional resonances are excited and hence much wider impedance bandwidth can be produced; especially at the higher band. To generate a band-stop characteristic, we use the self-complementary structure of the configuration that was inserted in the ground plane, which is a rotated Z-shaped slot at square radiating patch; with this design we can give a C-band rejection performance. The designed antenna has a small dimension of 12×18×0.8 mm3 . |
| Author(s): | N. Ojaroudi, N. Ghadimi, Y. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 3 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 1467 KB |
| Title: | Planar Two-Arm Spiral Antenna Fed by Microstrip Line |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-B Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 214 KB |
| Title: | Planar Terahertz Antenna Optimisation |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Recent Electromagnetics & Antennas Activities in the European Network "ACE" Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 604 KB |
| Title: | Planar Model of RF MEMS Shunt-Capacitive Switches |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 419 KB |
| Title: | Planar Microstrip Tri-Mode Bandpass Filter Using Center-Stub-Loaded Spiral Resonator |
| File Type: | Conference Paper |
| Issue: | Volume: S65 Advanced RF and Microwave I Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 243 KB |
| Title: | Planar Metamaterial for Matched Waveguide Termination |
| Abstract: | We present the design, fabrication, and characterization of a novel matched waveguide termination based on planar artificial metamaterial. This matched termination is realized by recent developed planar metamaterial absorber, which can be designed to near-completely absorb the propagating electromagnetic energy at the edge of a shorted rectangular waveguide. Theoretical discussions, numerical simulations and microwave experiments are employed to illustrate the matched characteristics of the proposed waveguide termination. As an example, a matched waveguide termination with standing wave ratio of 1.23 is experimentally demonstrated at microwave frequency. Our result yields a promising approach to design of novel waveguide terminations by techniques of metamaterials. |
| Author(s): | J. Li, F. Wang, G. Wen, Y. Huang, W. Zhu |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 12 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 458 KB |
| Title: | Planar Magnetic Integration Design Based on LLC Resonant Converter |
| Abstract: | High power density and high efficiency is a major trend in the development of power converters. The main measure to reduce the size of power converter is to improve the working frequency, and the limiting factor is the size of magnetic components. With the development of new semiconductor devices, the working frequency of power converters has been significantly improved, which gives us the opportunity to apply printed circuit board (PCB) winding planar magnetics. Compared with the traditional high frequency magnetics, planar magnetics not only reduce the size of the magnetic components effectively but also improve reliability through repeatable automated manufacturing, which is convenient for large-scale production. Magnetic integration is another method to reduce the size of the power converter. In this paper, a new magnetic structure based on PCB winding is proposed, which integrates inductance and transformer into one component. And the inductor can be independent of the transformer. In this structure, the inductance of inductor and excitation inductance of transformer can be easily controlled by changing the number of winding turns or the length of the air gap. A 20-W 200-kHz halfbridge LLC resonant converter with a peak efficiency of 94.9% is built to verify the feasibility of the designed planar magnetic integrated structure. |
| Author(s): | X. Deng, K. Zheng, Y. Gu, A. Zhang, Z. Jia |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 11 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 17573 KB |
| Title: | Planar Lens Antenna Based on Low-pass Frequency Selective Surfaces |
| File Type: | Conference Paper |
| Issue: | Volume: 4-4-B Antenna Design and Optimization Techniques II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 236 KB |
| Title: | Planar Dual-Band WLAN MIMO Antenna with High Isolation |
| Abstract: | In this paper, a dual-band multiple-input multiple-output (MIMO) antenna with a planar and rotational symmetric structure is presented. The proposed antenna comprises two via-fed monopole antennas arranged orthogonally in cross-pairs. When each monopole is excited, the other can be employed as a parasitic element. By properly adjusting the antenna dimensions, two resonant modes can be generated at about 2.45 and 5.6 GHz. Besides, the radiation patterns of two monopoles are orthogonal to each other, resulting in good pattern diversity and high isolation without using additional decoupling methods. Measured results show that two operating bands ranging from 2.3-2.75 and 5.09-6.16 GHz are obtained, which can cover the whole (2.4/5.2/5.8-GHz) wireless local area network (WLAN) bands. Port-to-port isolation is more than 24 and 22 dB at the lower and higher operating bands, respectively. Envelope correlation coefficient is studied as well. |
| Author(s): | H. Li, L. Kang, Y. Xu, Y.-Z. Yin |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 12 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1923 KB |
| Title: | Planar Compact U-Shaped Patch Antenna with High-Gain Operation for Wi-Fi/WiMAX Application |
| Abstract: | A planar inverted U-shaped patch antenna with high-gain operation applied for WLAN/WiMAX access point or base station has been proposed and investigated. It provides relatively wider impedance bandwidth of 180 MHz covering the operating bandwidth for WLAN/WiMAX system. The proposed planar patch antenna also provides the directional radiation patterns with maximum antenna peak gain and efficiency of 8.0 dBi and 80% across the operating band, respectively. Only with the antenna size of 44 × 35 × 4.0 mm3, the proposed patch antenna has the compact operation with more than 13% antenna size reduction. |
| Author(s): | J. Lu, H. Chin |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 1 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 391 KB |
| Title: | Planar Circular Monopole Antenna with Perforated Dielectric Resonator for Notched Ultra-Wide Band Applications |
| Abstract: | In this paper, a planar circular patch antenna is presented for UWB operating characteristics. The bandwidth of the proposed antenna is increased by inserting a perforated dielectric resonator (DR) material with the planar monopole. The design combines the advantages of a small size dielectric resonator (DR) and thin planar monopole antennas. Two antenna designs A and B are proposed. In design A, two layers of the same dielectric material are presented with the same radius and different thicknesses. While in antenna design B, only one dielectric material layer perforated by 11 holes drilled with the same radius is considered. The effects with respect to the geometric parameters of the proposed antennas on impedance bandwidth and radiation pattern are discussed. In addition, the two proposed antennas are designed to have a rejection frequency band from 5 to 6 GHz by inserting two U-shaped slots in the ground plane, where the WLAN service is allocated. The proposed antennas are completely designed and analyzed using the finite element method (FEM), and then the finite integral transform (FIT) technique is used to check the validity of the numerical results. |
| Author(s): | S. H. Zainud-Deen, A. Shaker, K. R. Mahmoud |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 6 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1008 KB |
| Title: | Planar Balanced-to-Unbalanced Power Divider |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-D Advanced Design of Multifunctional Microwave Passive Circuits Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 431 KB |
| Title: | Planar Antenna Design on the Characteristics of Moore Fractal-based High Impedance Surface |
| Abstract: | This work presents a planar antenna with a rectangular shape designed over a Moore curve fractalshaped High Impedance Surface (HIS). The Moore fractal geometries are space-filling curves and are useful for multiband applications. The Moore curve-shaped fractal HIS is simulated up to three iterations, and performance is examined. The proposed antenna has multiband operation within the S-band, C-band, and lower X-band frequency of operation. The antenna has a peak gain of 5.08 dB, 4.69 dB, and 5.07 dB with a Moore curve fractal HIS, with iterations 1, 2, and 3 used as the ground plane. The antenna has been analyzed regarding the reflection coefficient, radiation pattern, 3-D polar plots, and surface current distribution.With Moore curve iteration 1, a shaped HIS provides a maximum bandwidth of 740 MHz with the center frequency of 10.95 GHz, 1.24 GHz with the center frequency of 10.57 GHz, and 1.09 GHz with the center frequency of 12.5 GHz with the second and third iterations, respectively |
| Author(s): | A. K. Gupta, P. S. R. Chowdary, M. V. Krishna |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 6 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 4992 KB |
| Title: | Phase-only Synthesis Algorithm for Transmitarrays and Dielectric Lenses |
| Abstract: | In this work a phase-only synthesis algorithm is applied for the design of lens-array antennas yielding a desired radiation pattern. The potential relevance of spillover effect on the lens radiation pattern is illustrated, making it necessary to include it in the lens model and to take it into account in the synthesis algorithm. Thus, both the contribution of the lens and the spillover radiation are jointly modeled as a planar array. Moreover, in order to validate the algorithm, it has been applied to the synthesis of pixelated dielectric lenses, which have been simulated using a commercial software. Simulations show good agreement with the algorithm results, validating its use for this type of lenses. |
| Author(s): | S. Loredo, G. Leon, O. F. Robledo, E. G. Plaza |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2188 KB |
| Title: | PET-Based Instant Inkjet-Printed 4 × 4 Butler Matrix Beamforming Network |
| Abstract: | In this paper, a novel planar Butler matrix (BM) utilizing only 3 dB hybrid couplers and a crossover are implemented using a low-cost silver-nano inkjet printing technique. Unlike in the conventional design of BM where a phase shifter is required, this novel design does not need a phase shifter to be implemented. However, the use of delicate substrates like polyethylene terephthalate (PET) in the design makes it unique. This is not possible with the conventional thermal curing process, as PET substrate cannot be subjected to an excessively feverish temperature. The results obtained show good return loss and transmission coefficients better than 26.10 and 23.54 dB, respectively, at the center frequency. Similarly, an amplitude imbalance of less than 2.4 dB with phase mismatch within ±0.25º is achieved at the center frequency. The BM has a -10 dB bandwidth of 24.79% with a beam pattern produced at +13º,-40º, +40º, and -13º when ports 1-4 of the BM are energized. |
| Author(s): | S. A. Babale, S. K. A. Rahim, K. G. Tan, K. N. Paracha, A. D. Butt, I. Ali, S. H. Lawan |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 2 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2236 KB |
| Title: | Perturbed E-Shaped Patch Antenna for Wireless Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 1188 KB |
| Title: | Perspective of the Uniaxial Wavelet-transformed FDTD Scheme |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | Perspective of the Uniaxial Wavelet-transformed FDTD Scheme |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Computational Techniques in Electromagnetics - 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 644 KB |
| Title: | Performance of Multiple-Feed Metasurface Antennas with Different Numbers of Patch Cells and Different Substrate Thicknesses |
| Abstract: | The design and performance of low-profile, multiple-feed metasurface antennas with different numbers of patch cells and different substrate thicknesses at a terahertz frequency are presented in this paper. The utilized antenna designs consist of a periodic array (N × M) metallic square-patch metasurface and a planar feeding structure, which are both patterned on an electrically thin, high-permittivity GaAs substrate. The antenna gain increased in a linear fashion with an increasing number of patch cells, which were directly fed by the slit feedline. A 3-dB gain increment was observed irrespective of the substrate thickness when the number of patch cells was doubled. However, the 3-dB gain bandwidth as well as the radiation efficiency changed significantly with varying substrate thicknesses. The described antenna structure offers useful characteristics by means of a combination of different substrate thicknesses and patch numbers. In addition, the proposed antenna design features a number of benefits, including a low profile, mechanical robustness, easy integration into circuit boards, and excellent suitability for low-cost mass production. |
| Author(s): | N. Hussain, I. Park |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 1 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1747 KB |
| Title: | Performance of Multiple-Feed Metasurface Antennas with Different Numbers of Patch Cells and Different Substrate Thicknesses |
| Abstract: | The design and performance of low-profile, multiple-feed metasurface antennas with different numbers of patch cells and different substrate thicknesses at a terahertz frequency are presented in this paper. The utilized antenna designs consist of a periodic array (N × M) metallic square-patch metasurface and a planar feeding structure, which are both patterned on an electrically thin, high-permittivity GaAs substrate. The antenna gain increased in a linear fashion with an increasing number of patch cells, which were directly fed by the slit feedline. A 3-dB gain increment was observed irrespective of the substrate thickness when the number of patch cells was doubled. However, the 3-dB gain bandwidth as well as the radiation efficiency changed significantly with varying substrate thicknesses. The described antenna structure offers useful characteristics by means of a combination of different substrate thicknesses and patch numbers. In addition, the proposed antenna design features a number of benefits, including a low profile, mechanical robustness, easy integration into circuit boards, and excellent suitability for low-cost mass production. |
| Author(s): | N. Hussain, I. Park |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1810 KB |
| Title: | Performance of MATLAB and Python for Computational Electromagnetic Problems |
| Abstract: | MATLAB and Python are two common programming languages commonly used in computational electromagnetics. Both provide simple syntax and debugging tools to make even complicated tasks relatively simple. This paper studies how these programming languages compare in throughput for a variety of tasks when utilizing complex numbers which are common in electromagnetics applications. The compared tasks include basic operations like addition, subtraction, multiplication, and division, along with more complex operations like exponentiation, summation, Fourier transforms, and matrix solving. Each of these tests is performed for both single and double precision on the CPU. A 2D finite difference frequency domain problem and a planar array beamforming problem are also presented for comparison of throughput for realistic simulations. |
| Author(s): | A. J. Weiss, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1909 KB |
| Title: | Patch Antenna with L-Shaped Radiators |
| File Type: | Conference Paper |
| Issue: | Volume: Student Microwave Design Projects with Sonnet Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 226 KB |
| Title: | Parametric Model Generation Algorithm for Planar Microwave Structures based on Full–Wave analysis and Design of Experiment |
| File Type: | Conference Paper |
| Issue: | Volume: Time Domain Numerical Modeling Beyond FDTD Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 373 KB |
| Title: | Parameters Update Integration in EM Analysis of ATL and PTL in the FDM |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Transmission Lines Modeling, Macromodeling and Signal Integrity Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 136 KB |
| Title: | Parameter Identification of the Planar Integrated EMI Filter Based on the Improved Immune Algorithm |
| Abstract: | The planar integrated EMI filter has been widely used because of its small size and good highfrequency characteristics. During the production process, if the electrical parameters of the integrated LC structure can be accurately identified, it will help improve the high-frequency characteristics of the filter. However, this identification problem is a multi-peak problem, which can easily fall into a local optimal solution. Based on the Feature Selective Validation method, this paper proposes an improved Immune Algorithm. The proposed method keeps changing the fitness function in the iterative process to avoid the algorithm falling into the local optimal solution. Finally, comparing with the measured impedance characteristic curve, it is verified that the proposed method is more accurate than the common Immune Algorithm. |
| Author(s): | J. Bai, H. Zhao, Y. Liu, K. Guo |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 1 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1284 KB |
| Title: | Parallel SAI Preconditioned Adaptive Integral Method For Analysis of Large Planar Microstrip Antennas |
| Abstract: | An efficient parallel sparse approximate inverse (PSAI) preconditioning of the adaptive integral method (AIM) is proposed to analyze the large-scale planar microstrip antennas. The PSAI preconditioner is based on the parallelized Frobenius-norm minimization, and is used to speed up the convergence rate of the loose generalized minimal residual method (LGMRES) iterative solver. The parallel AIM is used to accelerate the required matrix vector product operations. Numerical results demonstrate that the PSAI preconditioner is effective with the AIM and can increase the parallel efficiency significantly when analyzing the large planar microstrip antennas. |
| Author(s): | M. Li, M. Chen, W. Zhuang, Z. Fan, R. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 11 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 302 KB |
| Title: | Palladium Decorated SWCNTs Sensor for Detecting Methane at Room Temperature Based on UWB-RFID |
| Abstract: | A chipless sensor in the protocol of ultra wideband radio frequency identification (UWB-RFID) is proposed in the paper. This sensor, used to detect methane at room temperature, is configured by a planar patch antenna plus a U slot on which interdigitated fingers electrodes (IDE) with load of palladium decorated single walled carbon nanotubes (Pd-SWCNTs) are embedded. The sensor can cover the entire UWB spectrum except for the band that produce band-gap. The amplitudes and frequencies of the band-gap are designated as the signatures modulated and reflecting the status quo of methane retrieved by Pd-SWCNTs. The sensor is validated by an approximate combination of the analytical and numerical method. Results show that if the concentration of methane is increased from 0 ppm to 100 ppm at room temperature, the identifiable sensitivity can be achieved by -9.32 dB in terms of the scheme of the amplitude modulation of band-gap frequency; or, the identifiable sensitivity can be achieved by -11.30 dB in terms of the scheme of the frequency modulation of band-gap frequency. |
| Author(s): | J. Liu, P. B. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 8 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1754 KB |
| Title: | Orthogonally Integrated Hybrid Antenna for Intelligent Transportation Systems |
| Abstract: | The aim of this paper is to design an orthogonally integrated hybrid antenna to address 5G/Wi-Fi/C-V2X communication simultaneously in one device. The proposed antenna consists of three planar monopoles and a defected ground plane with a dimension of 55x30x1.2mm3. High Frequency Structure Simulator (HFSS) is employed to design the proposed antenna, which resonates at three distinct frequencies 2.45 GHz (Wi-Fi), 3.5 GHz (5G), and 5.9 GHz. Further, the prototype antenna is fabricated and experimentally validated in comparing with simulation results. The excellent agreement among the simulation and measured results shows that the designed antenna operates simultaneously at 5G/Wi-Fi/C-V2X frequency bands and the isolation effects between the elements is less than 15dB. |
| Author(s): | S. Syedyusuff, R. Subramaniam, R. Vijay |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 5 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1688 KB |
| Title: | Optimum Plannar Antenna Design Based on an Integration of IE3D Commercial Code and Optimization Algorithms |
| Abstract: | The optimum planar antenna design utilizing a simulation tool based an integration of IE3D commercial code as an electromagnetic computational engine and an add-on optimization algorithm is proposed in this paper. The work is motivated by the popularity of planar antennas and the need of customized designs in industrial applications, which can be effectively achieved by using simulation tools. Currently available commercial codes are reliable and relatively accurate in the analysis with more efforts tending to enhance the efficiency. The quality of the antenna design will mainly rely on an effective optimization algorithm that can be and should be developed independently according to engineers’ own need since the variables and cost functions for optimization can be flexibly selected. The integration of existing analysis codes, as mentioned above, and self-developed algorithms will be most effective for an engineer in the customized antenna design. The concepts and strategies are addressed with numerical examples to validate. |
| Author(s): | Hsi-Tseng Chou, Yuan-Chang Hou, Wen-Jiao Liao, Hsi-Tseng Chou, Yuan-Chang Hou, Wen-Jiao Liao |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 3 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 775 KB |
| Title: | OPTIMIZING PLANAR SOURCE DISTRIBUTIONS FOR DEEP POWER DEPOSITION IN BIOLOGICAL TISSUE |
| Abstract: | In non-invasive hyperthermia, penetration depth in high water content biological tissue can be increased up to 3 times using a focused instead of uniform surface electric field distribution. The focusing involves maximizing the field integral at a focal point by solving for the surface phase function which makes the integrand real and positive for all surface points. The resulting non-linear differential equation is solved in using a series approximation. A focused power deposition pattern is presented using this ideal planar distribution which is the theoretical optimum for high resolution hyperthermia cancer treatment. [Vol. 7, No. 2, pp. 97- 109 (1992), Special Issue on Bioelectromagnetic Computations] |
| Author(s): | Carey M. Rappaport, Carey M. Rappaport |
| File Type: | Journal Paper |
| Issue: | Volume: 7 Number: 2 Year: 1992 |
| Download Link: | Click here to download PDF File Size: 860 KB |
| Title: | Optimization of the Shape of Non-Planar Electronically Scanned Arrays for IFF Applications via Multi-Objective Invasive Weed Optimization Algorithm |
| Abstract: | The identify friend or foe antenna is a complement to many radar antennas which allows the discrimination between friendly and hostile targets by receiving identification data. Such antenna must synthesize both a sum and a difference pattern in azimuth to allow target discrimination and must point to the target being inquired, either by mechanical or electronic scanning in azimuth. In this paper, to attain optimal electronic scanning, an array of antennas lying on a generic planar curve is considered. A multi-objective optimization based on the invasive weed optimization algorithm is then applied to the shape of such curve, aimed at maximizing performances. Whereas a conventional linear array of 6 elements can effectively scan ±30°, with respect to broadside, the proposed array, notwithstanding the same number of elements and overall length, can scan ±45° and still synthesize effective sum and difference patterns. |
| Author(s): | S. Maddio, G. Pelosi, M. Righini, S. Selleri, I. Vecchi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Optimization of Miniature Inverted-F Antenna for Biomedical Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 402 KB |
| Title: | Optimization of Miniature Inverted-F Antenna for Biomedical Applications |
| File Type: | Conference Paper |
| Issue: | Volume: CAD Models and EM Solvers for Antenna Design Optimization Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 402 KB |
| Title: | Optimal Design of Elliptical Array Antenna Using Opposition Based Differential Evolution Technique |
| Abstract: | Radiation pattern synthesis of non-uniformly excited planar arrays with the lowest relative side lobe level (SLL) is presented in this paper. Opposition based differential evolution (ODE) scheme, which represents a novel parameter optimization technique in antenna engineering is applied for the parameter optimization of the single and the multi-ring circular array (CA), hexagonal array (HA) and elliptical array (EA) of isotropic elements. To overcome the problem of premature convergence of differential evolution (DE) algorithm, ODE is designed without significantly impairing the fast converging property of DE. Two design examples are presented which illustrate the effectiveness of the ODE based method, and the optimization goal for each example is easily achieved. The design results obtained using ODE are much more improved than those of the results obtained using the state of the art evolution algorithms like particle swarm optimization (PSO), harmonic search (HS) and differential evolution (DE) methods in a statistically significant way. |
| Author(s): | R. Bera, D. Mandal, R. Kar, S. P. Ghoshal |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 9 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1833 KB |
| Title: | Optimal Design of an Ultra-Wideband Antenna with the Irregular Shape on Radiator using Particle Swarm Optimization |
| Abstract: | An ultra-wideband antenna with an irregular shape radiator for ultra-wideband applications has been designed by particle swarm optimization along with the simulator, HFSS. The proposed antenna design process is automated. Also, the better results can be obtained efficiently. The proposed antenna is fed by a coplanar waveguide line. The optimized antenna has a compact substrate size of 34.0 mm by 33.35 mm. Results show that the optimized irregular shape of the proposed antenna outperforms the antennas with uniform rectangular shapes in impedance matching. The optimized antenna can cover the spectrum of ultra-wideband (3.1 GHz - 10.6 GHz). The current distributions are investigated for describing the antenna characteristics. Moreover, the proposed UWB antenna has good characteristics of radiation, transmission, and impedance bandwidth. |
| Author(s): | W. C. Weng |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 5 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1271 KB |
| Title: | Optimal Design for an Ultra-wideband Antenna Using Particle Swarm Optimization |
| File Type: | Conference Paper |
| Issue: | Volume: Optimization Methods for EM Applications Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 1055 KB |
| Title: | ON THE USE OF PLANAR SCATTERING PROBLEM TECHNIQUES TO ANALYZE THIN PLANAR QUASI-MAGNETO-STATIC SHIELDING |
| Abstract: | A metallic screen scattering technique developed for microwave and millimetre wave applications is adapted, using the principle of duality to a quasi-magnetostatic shielding problem. In the limiting case of low frequency (0.01 Hz) the results compare favourably with the static solution. Moreover, this adaptation is expanded to treat finite permeability shields. [Vol. 9, No. 2 (1994), Special Issue on The Numerical Computation of Low Frequency Electromagnetic Fields, pp 83-92] |
| Author(s): | C.D. Hechtman, E.H. Lenzing, B.S. Perlman, C.D. Hechtman, E.H. Lenzing, B.S. Perlman |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 2 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 431 KB |
| Title: | On the Exploitation of Analytic Sequences for Array Interleaving |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Advances in Array Antenna Synthesis - Emerging Methods and Novel Applications Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 138 KB |
| Title: | On the Dispersive Properties of Planar Spiral Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 398 KB |
| Title: | ON THE APPLICATION OF THE SECANT METHOD TO THE SPECTRAL ITERATIVE APPROACH |
| Abstract: | A new iterative algorithm for calculating the electromagnetic scattering from planar, periodic gratmgs and grids was developed. Results are compared with the moment method and the Spectral Iteration (S.l.T.) method. The Secant approach is used in conjunction with the Spectral Iteration Approach to achieve convergence. It is shown that the Secant approach, which does not depend on the evaluation of numerical derivatives to achieve convergence like the contraction-corrector S.l.T. method, yields good results. Finally, suggestions for applying this method to two dimensional structures are included and discussed. [Vol. 3, No. 1, pp. 103-119 (1988)] |
| Author(s): | C. G. Christodoulou, R. J. Middelveen, J. F. Kauffman, C. G. Christodoulou, R. J. Middelveen, J. F. Kauffman |
| File Type: | Journal Paper |
| Issue: | Volume: 3 Number: 1 Year: 1988 |
| Download Link: | Click here to download PDF File Size: 795 KB |
| Title: | Obtaining Feasible Minimum Side Lobe Level for Narrow Beam Width Using Convex Optimization in Linear, Planar, and Random Antenna Arrays |
| Abstract: | In many applications, the radiating elements of the used antenna may be configured in the form of a one-dimensional linear array, or two-dimensional planar array or even random array. In such applications, a simple optimization algorithm is highly needed to optimally determine the excitation amplitudes and phases of the array elements to maximize the system’s performance. This paper uses a convex optimization instead of other complex global stochastic optimizations to synthesize a linear, planar, and random array patterns under prespecified constraint conditions. These constraints could be either fixed beam width with the lowest possible sidelobe levels or fixed sidelobe level with narrower possible beam width. Two approaches for array pattern optimization have been considered. The first one deals with the problem of obtaining a feasible minimum sidelobe level for a given beam width, while the second one tries to obtain a feasible minimum beam width pattern for a given sidelobe level. Both optimization approaches were applied to the linear, planar, and random arrays. Simulation results verified the effectiveness of both optimization approaches and for all considered array configurations. |
| Author(s): | R. R. Shaker, J. R. Mohammed |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 7182 KB |
| Title: | Numerical Simulation Approaches for Phased Array Design |
| Abstract: | Abstract - This paper reviews the two well-known numerical simulation techniques that are widely used in antenna modeling; the finite-difference time-domain (FDTD) and the Method of Moments (MoM). The packages FDANT (prepared in Fortran language by using FDTD) and NEC2 (public domain code for the MoM) are used to model various types of antenna arrays, their advantages/disadvantages are discussed on characteristic design examples, and they are calibrated one against the other. Also, a simple Matlab package (ANTEN_GUI) for the visualization of radiation patterns, beam forming and beam steering capabilities of user-designed planar arrays of isotropic radiators (which can be used to test the above mentioned packages and as an educational tool, in e.g., antennas and propagation lectures) is introduced1. |
| Author(s): | L. Sevgi, L. Sevgi |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 3 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 1360 KB |
| Title: | Numerical Analysis of Stacked Tapered Slot Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using FEKO I Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 943 KB |
| Title: | Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure |
| Abstract: | A novel planar ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, where the resonator consists of three radial stubs, one located in the middle and two symmetrically at both sides. This radial-stub-loaded structure situates the first four resonant modes in the UWB passband (3.1~10.6 GHz) and makes the fifth resonant mode far away from this passband. To enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. Finally, a UWB BPF with wide upper-stopband and sharp upper rejection skirt has been realized and its design steps have been also presented. The measured and full-wave simulated results of the proposed filter are in good agreement. |
| Author(s): | X. Deng, K. D. Xu, Z. Wang, B. Yan |
| File Type: | Express Journal Paper |
| Issue: | Volume: 32 Number: 12 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1757 KB |
| Title: | Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure |
| Abstract: | A novel planar ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, where the resonator consists of three radial stubs, one located in the middle and two symmetrically at both sides. This radial-stub-loaded structure situates the first four resonant modes in the UWB passband (3.1~10.6 GHz) and makes the fifth resonant mode far away from this passband. To enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. Finally, a UWB BPF with wide upper-stopband and sharp upper rejection skirt has been realized and its design steps have been also presented. The measured and full-wave simulated results of the proposed filter are in good agreement. |
| Author(s): | X. Deng, K. D. Xu, Z. Wang, B. Yan |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 12 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1757 KB |
| Title: | Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure |
| Abstract: | A novel planar ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, where the resonator consists of three radial stubs, one located in the middle and two symmetrically at both sides. This radial-stub-loaded structure situates the first four resonant modes in the UWB passband (3.1~10.6 GHz) and makes the fifth resonant mode far away from this passband. To enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. Finally, a UWB BPF with wide upper-stopband and sharp upper rejection skirt has been realized and its design steps have been also presented. The measured and full-wave simulated results of the proposed filter are in good agreement. |
| Author(s): | X. Deng, K. D. Xu, Z. Wang, B. Yan |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 605 KB |
| Title: | Novel High Performance Low Cost Phase Shifters Design Based on the Ferroelectric Materials Technology Using the WIPL-D Code |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling Using WIPL-D Code(I) Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 174 KB |
| Title: | Novel Broadband Circularly Polarized Monopole Antenna for Multi-communication Systems |
| Abstract: | This paper proposes a novel coplanar waveguide (CPW) fed broadband circularly polarized (CP) monopole antenna, which applies to C-band and various wireless communication systems. The antenna consists of the double circular-shaped patch (DCSP) with square and L-shaped slots, and an improved asymmetric ground plane. The prototype of the designed antenna has been fabricated. The results of the measurement show that the 10-dB impedance bandwidth (ZBW) is 117.8% (2.2–8.5 GHz), the 3-dB axial ratio bandwidth (ARBW) is 62% (4.45–8.45 GHz). |
| Author(s): | H. Chen, Q. Feng, Y. Wen, Q. Fu |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 10 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1257 KB |
| Title: | New Basis Functions for the Electromagnetic Solution of Arbitrarily-shaped, Three Dimensional Conducting Bodies Using Method of Moments |
| File Type: | Conference Paper |
| Issue: | Volume: MoM and Applications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 221 KB |
| Title: | Negative Index of Reflection in Planar Metamaterial Composed of Single Split-Ring Resonators |
| Abstract: | This paper reports the negative index of refraction in planar metamaterial consisted of only a traditional single split-ring resonator (SRR), which is proved to exhibit simultaneously negative permittivity and negative permeability without the use of assistant metallic structures by retrieving the effective electromagnetic parameters. With the aid of current distributions investigation, it is demonstrated that within the left-handed band the negative permittivity is generated in a way analogous to the case of dual parallel cut-wire metamaterial, and negative permeability arises from the asymmetric second-order magnetic resonant mode. |
| Author(s): | M. Tang, S. Xiao, D. Wang, J. Xiong, K. Chen, B. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 3 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1537 KB |
| Title: | Near to Far-Field Plane-Polar Transformation from Probe Positioning Error Affected Data |
| Abstract: | In this article, two efficient approaches for the correction of known positioning errors of the measurement probe in a plane-polar near to far-field (NTFF) transformation, requiring a minimum number of NF data in the case of quasi-planar antennas, are presented and experimentally assessed. Such a NTFF transformation benefits from a non-redundant sampling representation of the voltage detected by the probe got by modeling an antenna with a quasi-planar geometry through a double bowl, a surface consisting of two circular bowls with the same aperture radius, but with lateral bends which may differ to better fit the antenna shape. The uniform samples, i.e., those at the points set by the representation, are accurately retrieved from the collected not regularly distributed ones either by applying a singular value decomposition based approach or an iterative scheme. Then, the input NF data necessary for the classical plane-rectangular NTFF transformation are evaluated from the so retrieved non-redundant uniform samples through a 2-D optimal sampling interpolation formula. |
| Author(s): | F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 4 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 3201 KB |
| Title: | NEAR FIELDS OF A LOGAEPERIODIC DIPOLE ANTENNA: NEC MODELLING AND COMPARISON WITH MEASUREMENTS |
| Abstract: | Experiences of modelling a log-periodic antenna (tapered transmission line type) using NEC are reported. The antenna is required as a component of a near-field EMC test range, and hence computation of the near fields was the primary objective although some discussion of impedance is presented. Measurements of the near field of the real antenna were undertaken on a planar measurement range having the ability to scan planes at varying distances from the antenna. The measurements show good agreement with the predictions of NEC. [Vol. 2, No. 2, pp. 122-130 (1987)] |
| Author(s): | K. T. Wong, P. S. Excell, K. T. Wong, P. S. Excell |
| File Type: | Journal Paper |
| Issue: | Volume: 2 Number: 2 Year: 1987 |
| Download Link: | Click here to download PDF File Size: 773 KB |
| Title: | Mutual Coupling Reduction of Dual-Band Uni-Planar MIMO System Using Neutralization Line Technique |
| Abstract: | This paper presents a low–profile dual-band (2×2) MIMO antenna that works at 2.4GHz, 5.2GHz and 5.8GHz for wireless local area networks (WLAN) applications. A neutralization line technique for enhancing the isolation is used by introducing a strip line with a length of λg/4 at the isolation frequency (2.4GHz) between the radiating elements. The overall dimensions of the proposed antenna are 36×33.5×1.6 mm3. The antenna is fabricated and tested to validate the simulation results. The practical results show fair agreements with the simulated outcomes. The antenna achieves impedance bandwidths from 2.15GHz to 2.52GHz and from 4.5GHZ to 6.45GHz for reflection coefficient |S11| < -10dB. On the other hand, the result of S21 for the two bands is better than -10dB and it has reached to -25dB around 2.4GHz and -35dB around 5.5GHz. The MIMO antenna performance characteristics are reported in terms of scattering parameters, envelope correlation coefficient (ECC), total active reflection coefficient (TARC), channel capacity loss (CCL), diversity gain (DG) and antenna radiation patterns. Analysis of these characteristics indicates that the design is appropriate for the WLAN. |
| Author(s): | A. M. Saleh, T. A. Nagim, R. A. Abd-Alhameed, J. M. Noras, C. H. See |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 2 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2731 KB |
| Title: | Mutual Coupling Reduction in CBS Antenna Arrays by Utilizing Tuned EM-EBG and Non-planar Ground Plane |
| Abstract: | Radiation surface wave (surface current) on ground plane has a destructive effect on the characteristics of antennas which benefits from a common ground plane, especially Cavity Backed Slot (CBS) antennas. Surface current increases mutual coupling in an antenna array. This in turn causes unwanted characteristics in array applications. The main goal of this work is to design a new modified antenna array achieving less mutual coupling by reshaping ground plane and using tuned Elongated Mushroom Electromagnetic Band Gap (EM-EBG). Moreover, in this study, we focus on the influence of changing depth of EM-EBG holes. In this regard, four different designs for CBS antenna arrays are investigated. The results reveals that by using two new methods, namely stepped ground plane and tuned EMEBG, mutual coupling will be decreased by more than 9 dB. Decrement of mutual coupling improve radiation characteristic of array such as Front to Back Ratio (FBR) by 8 dB. The effectiveness of our design is confirmed by experimental results. |
| Author(s): | S. Manshari, F. H. Kashani, G. Moradi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1270 KB |
| Title: | Mutual Coupling Compensation-based Nonuniform Fourier Transform Technique for Accurate and Efficient Pattern Evaluation and its Application to Synthesis of Aperiodic Arrays |
| Abstract: | A rapid solution for evaluating the radiation pattern of aperiodic arrays, taking into account mutual coupling, is presented in this paper. The evaluation is achieved by eliminating the anisotropy of the active element pattern of the array through the use of the mutual coupling compensation matrix (MCCM) technique, in conjunction with the non-uniform fast Fourier transform (NuFFT). In order to eliminate the impact of mutual coupling on array pattern calculation, the MCCM is utilized to convert the active element pattern (AEP) of each element into a shared uniform term and make the NuFFT technique suitable for the array pattern calculation. The proposed solution is validated by evaluating the radiation pattern of a 64-element planar aperiodic array. In addition, the proposed solution is integrated into the Particle Swarm Optimization (PSO) to realize a pattern synthesis method. Two synthesized patterns, including a pencil beam with low sidelobe level and a flat-top beam pattern, are executed to validate. Compared with several reported methods, the proposed method can improve the synthesis efficiency and maintain good accuracy simultaneously. |
| Author(s): | F. Peng, C. Liao, Y.-F. Cheng, J. Feng, S.-D. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 6 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 7167 KB |
| Title: | Multiresolution Time Domain for Studies of Planar Stratified Media |
| File Type: | Conference Paper |
| Issue: | Volume: Posters Session 2 Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 374 KB |
| Title: | Multiresolution Time Domain Based Different Wavelet Basis Studies of Scattering of Planar Stratified Medium and Rectangular Dielectric Cylinder |
| Abstract: | In this paper, several wavelet bases, namely, the Daubechies, the biorthogonal Coiflet, the Deslauriers-Dubuc interpolating functions, and the cubic spline Battle-Lemarie, are applied to the multiresolution time domain (MRTD) technique for planar stratified media and electromagnetic scattering. These MRTD schemes are studied via field expansions of the scaling functions in one-dimensional (1D) and two-dimensional (2D) cases. A rigorous treatment method for inhomogeneous media structures is given. We have focused here on the study of reflected and transmission coefficients for an electromagnetic wave propagation on a stratified slab media and the scattering width (SW) of a rectangular dielectric cylinder. The 1D propagation characteristics of single and periodical stratified media and the 2D scattering width of the MRTD schemes are compared with the results of the FDTD method. Finally, we describe the computational accuracy of the relative peaks and shifting position errors, via a comparison of the results of the MRTD scheme based on the different basis with those of the FDTD method. |
| Author(s): | Q. Cao, K. K. Tamma, Q. Cao, K. K. Tamma |
| File Type: | Journal Paper |
| Issue: | Volume: 20 Number: 1 Year: 2005 |
| Download Link: | Click here to download PDF File Size: 639 KB |
| Title: | Multiple Rectangular Slotted Patch Antenna with Roof-top Shaped at 15.3 GHz |
| Abstract: | In this paper, a compact sized, high frequency microstrip patch antenna with probe feeding is designed, simulated, built and tested. The patch of the antenna is diamond shaped which has a rectangular slot in the upper-center. Main contribution of the paper is to perturb the side edges of the patch and to add a rectangular slot. Parametric study of that twosubstrate change was investigated. The proposed structures were simulated by using the Sonnet Suites, a planar 3-D electromagnetic simulation software which gave S11 value of -13.82 dB and gain value of 6.33 dB at 15.3 GHz. |
| Author(s): | M. E. Koca, T. Durak, S. T. Imeci |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1450 KB |
| Title: | Multiband Multipolarized Planar Antenna for WLAN/WiMAX Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Finite-Difference Time-Domain Method: Theory and Applications Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 232 KB |
| Title: | Multiband Antenna for Wireless Applications Including GSM/UMTS/LTE and 5G Bands |
| Abstract: | A simple ultra thin multiband antenna is introduced. The proposed antenna with four bands covers many wireless applications. The proposed antenna has simple configuration including two open L-shaped slots to create resonat mode at GSM and GPS bands and also two rectangular slots on the radiating element for creating multi resonant modes to meet the specifications of mentioned frequency bands. According to the simple, small and planar configuration, the proposed antenna design is inexpensive and can easily be integrated with the other microwave circuit boards. The proposed antenna has the small size of 10 mm and the total size of 120 mm x 60 mm x 0.5 mm, promising to be used widely in compact and ultra slim handsets. |
| Author(s): | A. J. Khalilabadi, A. Zadehgol |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1115 KB |
| Title: | Multiband Antenna for Wireless Applications Including GSM/UMTS/LTE and 5G Bands |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Wideband and Multiband Antennas Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 147 KB |
| Title: | Multi-Slot Antenna for Radar Systems |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Antenna Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 220 KB |
| Title: | Multi-Fidelity Multi-Grid Design Optimization of Planar Microwave Structures with Sonnet |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using Sonnet - I Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 245 KB |
| Title: | Multi-Fidelity Design Optimization of Planar Inductors with Sonnet |
| File Type: | Conference Paper |
| Issue: | Volume: S41 EM Modeling using Sonnet I Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 234 KB |
| Title: | Multi-Bandwidth CPW-Fed Open End Square Loop Monopole Antenna for Energy Harvesting |
| Abstract: | Compact CPW-fed open end square loop monopole antenna is presented. The antenna can harvest ambient power at different radio frequencies of 1.8, 1.9, 2.4 and 5.2 GHz. The multi-band coplanar waveguide antenna (MCPW) is designed and fabricated on a very thin and lowprofile substrate. The proposed antenna is used to measure the ambient spectrum in two different places. One of them is indoor and the other is outdoor, in order to see the effect of the place on the proposed energy harvesting system. A multi-band rectifier circuit is designed and integrated with the proposed antenna. The maximum simulation efficiency is 60.98% at 1.9 GHz and -1 dBm input power. The maximum measured efficiency is 60.57% at 2.5 GHz and -1 dBm RF received power. Also, the proposed rectenna has 53.1% measured efficiency at 2.5 GHz and RF received power of -5 dBm. |
| Author(s): | N. Eltresy, D. Elsheakh, E. Abdallah, H. Elhenawy |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1550 KB |
| Title: | Multi-Bandwidth CPW-Fed Open End Square Loop Monopole Antenna for Energy Harvesting |
| File Type: | Conference Paper |
| Issue: | Volume: S42 Wireless Implants for Biomedical Telemetry II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 289 KB |
| Title: | Multi-band Loop Antenna Integrated with a Telephone Handset |
| File Type: | Conference Paper |
| Issue: | Volume: Integrated Antennas for Portable Devices Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 473 KB |
| Title: | Multi Band Antenna System for Energy Harvesters |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Wireless Power Transfer and Energy Harvesting: Advances in Modelling and Practice Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 203 KB |
| Title: | MTRT - A MODIFIED TRANSVERSE RESONANCE TECHNIQUE |
| Abstract: | In this work a modified formulation of the transverse resonance technique (TRT) is presented. The difference between the usual TRT and the formulation presented here, MTRT, is the equivalent network considered. With the MTRT proposed formulation, mode solution identification requires less arduous work. The complete equation set is described. Numerical results are presented for dispersion characteristics of microstrip lines, coupled microstrip lines and conductor-backed coplanar waveguides (CBCW). When compared to results obtained by other methods, a good agreement is observed. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 19-25] |
| Author(s): | Alfredo Gomes Neto, Creso S. da Rocha, Herve' Aubert Aubert, D. Bajon, H. Baudrand, Alfredo Gomes Neto, Creso S. da Rocha, Herve' Aubert Aubert, D. Bajon, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 303 KB |
| Title: | Modeling of Planar Multilayered Periodic Arrays using the Method of Lines |
| Abstract: | This paper presents an implementation of the Method of Lines, a semi-analytical method, for the numerical modeling of radiating stratified periodic structures composed of dielectric layers interspersed with metallic patches and slots. Beam scanning antenna arrays and frequency selective surfaces (FSS) are among possible applications. The combined use of the Modified Bioconjuguate Gradient Squared method with Stabilization, an interactive resolution method, together with the Fast Fourier Transform allows for the analysis of a wide array of problems using uniform, high discretization density by considerably speeding up the resolution process and drastically reducing memory requirements. Periodic FSS and slot coupled patch array antennas were simulated. A comparison of simulation results with available literature allows validation of the new approach. |
| Author(s): | Aric Choiniere, Jean-Jacques Laurin, Aric Choiniere, Jean-Jacques Laurin |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 2 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 1387 KB |
| Title: | Modeling of Medium Frequency Propagation Along a Thin Wire Parallel to a Lossy Return Path |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using FEKO I Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 753 KB |
| Title: | Modeling of Dual-Polarized Frequency Independent Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO - II Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 832 KB |
| Title: | Modeling Large Finite Frequency-Selective Surfaces with FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis - 2 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 263 KB |
| Title: | Modeling and Design of Frequency Independent Antennas for Millimeter Wave Electronic Warfare and UHF Platform Integration |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using FEKO Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 527 KB |
| Title: | Mode Conversion Caused by Bending in Photonic Subwavelength Waveguides |
| Abstract: | We study the propagation of light in a subwavelength planar waveguide with an angular bend. We observe the mode conversion of a guided wave with a symmetric beam profile impinging into the bending of a waveguide. The guided wave outgoing from the bend is a mixed set of symmetric and asymmetric modes. The amount of mode conversion through the bend is quantified by calculating the Fourier transform of the electric field profile. It is found that the conversion rate is a function of the bending angle. |
| Author(s): | Y. J. Rodriguez-Viveros, D. Moctezuma-Enriquez, P. Castro-Garay, B. Manzanares-Martinez, C. I. Ham-Rodriguez, E. Urrutia-Banuelos, J. Manzanares-Martinez |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 12 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 708 KB |
| Title: | MIXED ELEMENT FORMULATION FOR THE FINITE ELEMENT-BOUNDARY INTEGRAL METHOD |
| Abstract: | A mixed element approach using right hexahedral elements and right prism elements for the finite element-boundary integral method is presented and discussed for the study of planar cavity-backed antennas. The mixed element method is shown to decrease the required computation time for geometrically constrained geometries by reducing the unknown count on the open aperture on the cavity. By reducing the unknown count on the surface, the memory and computational cost associated with the boundary integral portion of the solution is decreased versus solutions using only prism elements. The accuracy of the mixed element approach is shown to be comparable with that of a single element approach, especially for far field parameters such as radiation pattern and radar cross section. |
| Author(s): | J. Meese, L. C. Kempel, S.W. Schneider, J. Meese, L. C. Kempel, S.W. Schneider |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 1 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 329 KB |
| Title: | Miniaturized Omnidirectional UHF RFID Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: S36 Antennas and Arrays Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 464 KB |
| Title: | Miniaturized Dual Band RFID Planar Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Small Antennas - II Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 333 KB |
| Title: | Miniaturization of a Broadband Quadrature Hybrid Coupler Using ?-Model Transformation-Based Artificial Transmission Line |
| Abstract: | In this paper, a novel compact broadband quadrature hybrid coupler based on planar artificial transmission line is presented. This coupler can be used for WLAN application at 2.4 GHz. The planar artificial transmission line has been implemented using ?-model technique. The size of the proposed coupler is merely 38% of that of a conventional one. The compact coupler performs well wideband response. |
| Author(s): | V. I. Nejad, A. A. Lotfi-Neyestanak, A. Shahzadi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 3 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 500 KB |
| Title: | Miniaturization and Optimization of Meander-line Dipole Antenna Arrays via Orthogonal Array Initialized Hybrid Particle Swarm Optimizer |
| File Type: | Conference Paper |
| Issue: | Volume: Optimization Methods for Electromagnetics Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 437 KB |
| Title: | Millimeter Wave Fuze Radome Design Based Bandpass Frequency Selective Surface |
| Abstract: | This paper studies a fuze radome system applied to millimeter waves. The system consists of feed antenna, radome, planar FSS array or curve conformal array. Microstrip antenna is used as the feed antenna. Based on the principle of equispaced and equal period respectively, cross units loading single layer dielectric form planar and curve FSS array. The FSS radome system can improve the permeability of hood to electromagnetic waves (EM) of passband, and reduce the interference of complex EM in the external environment to the system. The FSS radome will not deteriorate radiation characteristics of the feed antenna. The planar FSS radome has a passband of 98.2 GHz to 101.55 GHz with -10dB relative bandwidth of 3.35%. The curve FSS radome has a passband of 96.3 GHz to 101.8 GHz with -10dB relative bandwidth of 5.5%. In addition, the radiation characteristics of the proposed system are analyzed. It is found that the radiation pattern of the antenna is basically consistency before and after loading the radome. |
| Author(s): | M. Zhao, J. Bi, J. Xu, J. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1682 KB |
| Title: | \"Introduction to Antennas\" – an antenna training DVD |
| File Type: | Conference Paper |
| Issue: | Volume: CEM for Applied Analysis and Synthesis Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 350 KB |
| Title: | \"Capacity estimation of HF ionospheric Channel\" |
| File Type: | Conference Paper |
| Issue: | Volume: Posters Session 2 Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 352 KB |
| Title: | Zooming into the Near-fields: Embedding Generalized- and Pseudo-functions in the Solution Space of Maxwell's Equations |
| File Type: | Conference Paper |
| Issue: | Volume: Mathematical Aspects of CEM Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 330 KB |
| Title: | Z-diagonalized Planewave/FD Approach for Analyzing TE Polarized Waves in 2D Photonic Crystals |
| File Type: | Conference Paper |
| Issue: | Volume: FDTD Methods and Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 300 KB |
| Title: | Yee-based 3D electromagnetic algorithm for discontinuous anisotropic dielectrics with global 2nd-order error |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Finite Difference Time Domain Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 138 KB |
| Title: | X-Band Radar for Monitoring Space Debris |
| File Type: | Conference Paper |
| Issue: | Volume: S16 Advanced Technology for Radar Remote Sensing Applications Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 329 KB |
| Title: | X-Band Linear Dielectric Resonator Antenna Array Fed by Dielectric Resonator Power Divider Array |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Phased Array Modeling Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 486 KB |
| Title: | X-Band Isoflux Concentric Circular Antenna Arrays for Image Data Download from LEO Satellites to Ground Stations |
| Abstract: | A circularly polarized isoflux beam synthesized by concentric circular arrays of printed microstrip patch antennas is proposed for X-band transmission of image data from land-imaging LEO satellites to the ground stations. This beam has a wide coverage angle of about 100° of uniform illumination. The paper introduces a novel design of a compact righthand circularly polarized microstrip patch as an element for the concentric circular arrays. The patch antenna has impedance matching bandwidth of about 600 MHz and axial ratio bandwidth of about 170 MHz at 8.1 GHz. A prototype of the proposed patch antenna is fabricated for experimental measurements. The electromagnetic simulation and experimental results show good agreement. A computationally efficient particle swarm optimization (PSO) procedure is developed and applied to find the distribution of the excitation magnitudes over the array elements so as to generate an isoflux beam in all the elevation planes with circular symmetry in the azimuth planes. The phase of excitation is the same for all the array elements. The method proposed to apply the PSO reduces the computational resources to about 6.5% of those required by the conventional method of application. Moreover, the proposed iterative PSO procedure is shown to be very fast convergent. |
| Author(s): | M. A. El-Hassan, K. F. A. Hussein, A. E. Farahat, K. H. Awadalla |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 11 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1802 KB |
| Title: | Wrapping Existing Electromagnetic Code into an Object-Oriented Scripting Programming Language |
| File Type: | Conference Paper |
| Issue: | Volume: Object Oriented Computational Electromagnetics Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 151 KB |
| Title: | Women’s History Month Special Article: Interview with “Professor Ozlem Kilic” |
| Abstract: | The month of March is Women’s History Month. We all have heard and know that only a small percentage of electrical engineers are female. This percentage is even smaller for those that are experts in the field of applied computational electromagnetics. In this article, we are focusing on Dr. Ozlem Kilic, one of the well-known and established intellectuals in the field of computational electromagnetics. Dr. Kilic not only has been a role model for young students as an excellent researcher, a technical leader, and a prolific writer in this field, but also she has extensive experience in teaching and has taken many academic administration roles. |
| Author(s): | S. Noghanian |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 3 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 398 KB |
| Title: | Women’s History Month Special Article: Interview with “Professor Cynthia Furse” |
| Abstract: | In this article I had the pleasure of interviewing Professor Cynthia Furse. Professor Furse is not only an internationally well-known researcher in the field of computation and applied electromagnetics (EM), but also an innovator in modern teaching techniques, an entrepreneur, an academic leader, and a true mentor for many young professionals in the electromagnetics field. |
| Author(s): | S. Noghanian |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 3 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 796 KB |
| Title: | Wireless Propagation in Non Line of Sight Urban Areas using Uniform Theory of Diffraction |
| Abstract: | This paper describes a three-dimensional electromagnetic propagation model for signal power prediction in a non line of sight urban area located in Singapore. The model, which is implemented using the Ohio State NEC-BSC V4.2 basic scattering code and is based on ray theory and uniform theory of diffraction (UTD) takes into account first, second, and third order effects including triple reflections and diffractions. The simplified propagation model of Raffles Place, the central business district of Singapore, uses more than 360 geometrical structures and is compared with data measured at 937.6 MHz along a drive route at the site. The results from the propagation model produced reasonable agreement with the measurements showing that a simplified model using UTD can be used to simulate the gross features of electromagnetic scatter in an urban area. It is shown that use of penetrable dielectric building walls are also necessary for accurate prediction of radio wave propagation in urban areas under non line of sight conditions. It is also found that third order scattering effects can be dominant in non line of sight situations and may be necessary for accurate predictions. |
| Author(s): | G. A. Ellis, G. A. Ellis |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 126 KB |
| Title: | Wireless Power Transfer via Negative Permittivity Metamaterials as Resonating Elements |
| File Type: | Conference Paper |
| Issue: | Volume: S42 Wireless Power Transfer Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 252 KB |
| Title: | Wireless Power Transfer Using Magneto-Electric Dipoles |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Wireless Power Transfer and Energy Harvesting: Advances in Modelling and Practice Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 245 KB |
| Title: | Wireless Power Transfer to Closely Coupled Loop Antennas Embedded in Concrete for Sensing |
| File Type: | Conference Paper |
| Issue: | Volume: Wireless Powering of Devices & Energy Harvesting Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 235 KB |
| Title: | Wireless Energy Harvesting Using a Negatively Charged UV Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 3-3-D Wireless Power Transfer and Harvesting Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 230 KB |
| Title: | Wireless Communication Applications of the Continuous Transverse Stub (CTS) Array at Microwave and Millimeter Wave Frequencies. |
| File Type: | Conference Paper |
| Issue: | Volume: Phased Array and Active Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 915 KB |
| Title: | Wireless Communication Antennas: Special Requirements And New Designs of Dielectric Resonator Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 108 KB |
| Title: | Wireless Body Area Networks: UWB Antenna design and Channel Modeling |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Biomedical Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 2905 KB |
| Title: | WIREGRID: A NEC2 PRE-PROCESSOR |
| Abstract: | WIREGRID is a pre-processor for the widely used public domain method of moments computer code NEC2. WIREGRID was developed for modelling metallic structures using a mesh of wires. In particular, it has powerful facilities for controlling the density of the mesh, permitting the same basic model to be used for different frequencies, with the code automatically generating a suitable mesh for a particular frequency. WIREGRID is not limited to generating wire meshes: it can also be usefully applied to true thin-wire modelling, for instance for Yagi-Uda and log-periodic antennas. In this paper, the basic philosophy of the code is described, and the code capabilities are detailed. Sufficient detail is presented so that the paper can serve as a reference for code users. The meshing algorithm is briefly described. An example is shown of the automatic mesh generation capabilities applied to an automobile. WIREGRID is available in the public domain via anonymous ftp; details of the ftp sites and hardware requirements are given in the appendices. [Vol. 10, No. 1 (1995), pp 31-39] |
| Author(s): | C. F. du Toit, D.B. Davidson, C. F. du Toit, D.B. Davidson |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 844 KB |
| Title: | WIRE-GRID MODELING OF SLOT ANTENNAS |
| Abstract: | The ability of a computer code to model slot antennas is investigated. A comparison of experimental and numerically calculated antenna data is presented. [Vol. 1, No. 1, pp.6-14 (1986)] |
| Author(s): | Jimmy L. Funke, Jimmy L. Funke |
| File Type: | Journal Paper |
| Issue: | Volume: 1 Number: 1 Year: 1986 |
| Download Link: | Click here to download PDF File Size: 1140 KB |
| Title: | Wire Grid Moment Method (NEC) Models of a Patch Antenna |
| Abstract: | Wire grid models of an air-loaded resonant circular patch antenna are used to calculate several observable quantities. The resonant frequency, input reactance, and bandwidth are accurately calculated, but the input resistance is underestimated by the grid models due to the existence of separate currents on both the top and bottom of the measured solid patch. The Lawrence Livermore (NEC3) Method of Moments computer program was used to generage the grid models. Averge wire lengths of about 0.03 wavelengths are required for accurate results. A comparison with other studies suggests that the 0.03 wavelength segmentation may be required because the patch is close to the ground plane (0.0175 wavelengths), and/or because errors in the near field calculation are compounded by the large fraction of energy stored in the near field since the patch is a high Q resonator. |
| Author(s): | P.G. Elliot, S.T. McBride, P.G. Elliot, S.T. McBride |
| File Type: | Journal Paper |
| Issue: | Volume: 4 Number: 3 Year: 1989 |
| Download Link: | Click here to download PDF File Size: 703 KB |
| Title: | Wire Fault Diagnosis Using Time-Domain Reflectometry and Backtracking Search Optimization Algorithm |
| File Type: | Conference Paper |
| Issue: | Volume: S43 Inverse Finite Element Optimization in Electromagnetic Product Design and Non-Destructive Evalutation II Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 251 KB |
| Title: | Wire Fault Diagnosis Based on Time-Domain Reflectometry and Backtracking Search Optimization Algorithm |
| Abstract: | The development of a robust and accurate fault diagnosis approach under various system and fault conditions is a research area of great interest. The objective of this paper is to develop a new non-destructive approach for wiring diagnosis based on Time Domain Reflectometry (TDR) in one hand and on Backtracking Search Optimization Algorithm (BSA) in the other hand. Real-world case studies are investigated to demonstrate the effectiveness and robustness of the proposed approach. Simulation results evaluated from experimental data demonstrate that the proposed approach can be used for effective diagnosis of complex wiring networks. |
| Author(s): | H. Boudjefdjouf, H. R. E. H. Bouchekara, F. de Paulis, M. K. Smail, A. Orlandi, R. Mehasni |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 4 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 723 KB |
| Title: | WIPL-D Results and Time Domain Response for an Impulse Radiating Antenna (IRA) |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Electromagnetic Modeling by WIPL-D Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | WIPL-D Results and Time Domain Response for an Impulse Radiating Antenna (IRA) |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Electromagnetic Modeling by WIPL-D Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 193 KB |
| Title: | WIPL-D Parallelization Effort |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Electromagnetic Modeling by WIPL-D Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 117 KB |
| Title: | WIPL-D Model and Simulation Results for a 6ft Diameter Impulse Radiating Antenna (IRA) |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D Software Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 148 KB |
| Title: | WIPL-D Compared to Other EM Codes for the Analysis of Printed Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling by WIPL-D Code Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 431 KB |
| Title: | WIPL Code Validation for Metallic Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling by WIPL-D Code Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 253 KB |
| Title: | Wind Turbine RCS Modeling and Validation* |
| File Type: | Conference Paper |
| Issue: | Volume: Topics in Radar Scattering Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 201 KB |
| Title: | Wind Power Axial-Flux PM Generator Loss Computation Using Quasi-3D FEA |
| File Type: | Conference Paper |
| Issue: | Volume: S07 Low Frequency Magnetics Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 779 KB |
| Title: | Wideband, Scanning Array for Simultaneous Transmit and Receive |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Broadband Antennas and Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 322 KB |
| Title: | Wideband Single-Fed Circularly Polarized Stacked Patch Antenna With L-Shaped Stub |
| Abstract: | A wideband single-fed circularly polarized (CP) stacked patch antenna with an L-shaped stub is presented. The CP antenna is made up of the bottom gradient microstrip transmission line, middle driven patch and top square radiation patch. The driven patch with an Lshaped stub and opening slot can achieve a wideband CP radiation which is different from a conventional patch. The presented CP stacked patch antenna maintains good directional radiation, while featuring wideband CP radiation. The final tested results indicate that the presented CP antenna has significant performance with a –10-dB impedance bandwidth of 42.1% (4.26-6.53 GHz), a 3- dB AR bandwidth of 26.0% (4.36-5.66 GHz) and broadside peak gain of 8.6 dBic. Moreover, the fifth-generation (5G) N79 band (4.4-5.0 GHz) and 5G wireless local area network (WLAN) band (5.15-5.35 GHz) can be covered by the operating bandwidth of the presented CP antenna. |
| Author(s): | W. Li, W. Xue, Y. Li, X. Xiong, K. L. Chung, Z. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 12 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2257 KB |
| Title: | Wideband Single Arm Spiral Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: S14 EM Modeling using FEKO - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 478 KB |
| Title: | Wideband Self-adjoint Jacobian Computation with Time-domain Field Solutions |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling with QuickWave/Concerto Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 210 KB |
| Title: | Wideband Quasi-Yagi Antenna with Broad-Beam Dual-Polarized Radiation for Indoor Access Points |
| Abstract: | This paper presents a wideband, broad beamwidth, dual-polarized antenna for the indoor access points. Its primary radiating elements are two quasi-Yagi antennas, which are arranged orthogonally. The antenna element employs two balanced directors to broaden bandwidth and avoid the structural conflict of the orthogonal installation. A microstrip-slotline transformer is used in the feeding structure for allowing the wideband operation and high port-to-port isolation. The dualpolarized quasi-Yagi antenna is incorporated with a metallic cavity in order to improve the unidirectional radiation in terms of gain, front-to-back ratio, and beamwidth. The final prototype has been fabricated and tested. The antenna yielded a wide impedance bandwidth covering a frequency range from 1.64 to 3.0 GHz (60%) for both ports with port-to-port isolation of a higher than 25 dB. In addition, at both ports, the antenna achieves stable unidirectional radiation with broad beamwidth, high front-to-back ratio, and high radiation efficiency. |
| Author(s): | S. X. Ta, C. D. Bui, T. K. Nguyen |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1560 KB |
| Title: | Wideband Printed Lotus Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Wideband Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 283 KB |
| Title: | Wideband Printed CPW-fed Binomial Curved Slot Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling and Small Antennas Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 250 KB |
| Title: | Wideband Printed Antipodal Vivaldi Antenna using Straight Slots for UHF DVB-T/T2 Applications |
| Abstract: | This paper presents a wideband printed antipodal Vivaldi antenna using straight slots for UHF DVB-T/T2 applications covering a frequency range of 470–862 MHz. The proposed antenna consists of two radiation flares with straight slots and a feeding line. A wideband impedance matching was achieved by inserting the slots between the flares and the feeding line. For the experimental verification of the proposed antenna, it was fabricated on a flat circular printed circuit board (PCB) substrate with a radius of 0.25 λ0, where λ0 is the wavelength at 0.74 GHz (the center frequency of the operating band). The measured −10 dB impedance bandwidth and maximum gain were approximately 72.1% (0.47–1.00 GHz) and 2.57 dBi, respectively. Due to the addition of the slots, the impedance bandwidth of the proposed antenna was improved by approximately 212% compared with the Vivaldi antenna without slots. |
| Author(s): | N.-R. Kwon, S.-H. Ahn, W.-S. Lee |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 6 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 4821 KB |
| Title: | Wideband Power Divider Using Novel Split-Ring Resonator |
| Abstract: | A set of novel split-ring resonator basic block Hybrid-Microwave Integrated-Circuit (HMIC) components (transmission line, open and short stubs) is presented with applications to the RF/Microwave power divider. This new open and short LH HMIC resonators have compact sizes of 0.81 and 1.44 mm2 , respectively. The prototypes of an LH power divider constructed from these basic components have been designed, fabricated, and characterized. The LH power divider including two LH branches shows equal power split from 1 to 7 GHz. The proposed power divider benefit from the miniaturized LH HMIC components and have compact sizes of 2.205 mm2 , respectively. There is a good agreement between the full-wave simulations and measurement results with 0.254-mm thick RT5880 substrate. While maintaining similar performance, a 50% reduction in impedance transformer is achieved in comparison to a conventional design. |
| Author(s): | T. Huang, D. Jiang, H. Hu |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 2 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 235 KB |
| Title: | Wideband Open Sleeve Dipole Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S45 UWB and Multi-Band Antennas II Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 720 KB |
| Title: | Wideband Octagonal Dual Circularly Polarized Sub-array Antenna for Ku-Satellite Systems |
| Abstract: | In this paper the analysis and design of a dual circularly polarized 4×4 antenna array operating in Ku-band are discussed with emphasis on its sequential feeding network. The dual circular polarization is achieved by feeding a stacked octagonal patches with a wideband branch line coupler. The proposed 4×4 antenna array is based on two separate sequential feeding networks for LH and RH circular polarizations. The advantage of the proposed feeding network is that it is implemented on a single layer. Simulation results by using both HFSS and CST are presented for comparison. In addition, experimental verifications are presented. |
| Author(s): | K. M. Ibrahim, W. M. Hassan, E. A. Abdallah, A. M. Attiya |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 12 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1254 KB |
| Title: | Wideband Multi-Port Network Integrated by 3-dB Branch-Line Couplers |
| Abstract: | The design of a multi-port network integrated by symmetrical alignment of four 3-dB branch-line couplers (BLCs) for wideband communication applications is presented. The BLC is designed with the implementation of stub impedance at each port’s transmission line and defect ground structure (DGS) underneath the shunt branches of BLC to improve bandwidth. The designs of the BLC and the multi-port network are performed by using CST Microwave Studio, a three-dimensional (3D) electromagnetic wave simulator. The designed wideband BLC and multi-port are fabricated, and their wideband performances of 2.3 to 5.3 GHz are verified. |
| Author(s): | N. A. M. Shukor, N. Seman, T. A. Rahman |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 7 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2248 KB |
| Title: | Wideband Multi-polarization Reconfigurable Antenna based on Non-uniform Polarization Convert AMC Reflector |
| Abstract: | A novel design of wideband multipolarization reconfigurable antenna is proposed, based on a non-uniform polarization convert artificial magnetic conductor (AMC) reflector. The proposed antenna consists of a radiator element and an AMC reflector. Firstly, a modified polarization convert AMC reflector is designed. The non-uniform AMC reflector causes an enhancement of 3 dB axial ratio (AR) performance. Secondly, a wideband linearly polarized monopole antenna is presented as the main radiator, utilizing the broadband characteristic of a C-shaped monopole. The polarization reconfigurability of the proposed antenna can be achieved by properly rotating the AMC reflector, which can be switched between linear polarization (LP), lefthand circular polarization (LHCP), and right-hand circular polarization (RHCP). A prototype of the proposed antenna is fabricated and experimented with to validate the theoretical performance. The measured results show a - 10 dB impedance bandwidth of 42.7% and 44.4% for LP and CP modes, respectively, and a 3 dB AR bandwidth of 20% for CP modes. In addition, the measured peak gain reaches 8 dBi/dBic. A good agreement is shown between the simulation and measurement, pointing to the good performance of the proposed antenna. |
| Author(s): | L. Li, J.-J. Liang, X. Liu, T. Chen, J. Lv, Z. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 9 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 6353 KB |
| Title: | Wideband Monostatic RCS Prediction of Complex Objects using Support Vector Regression and Grey-wolf Optimizer |
| Abstract: | This paper presents a method based on the support vector regression (SVR) model and grey wolf optimizer (GWO) algorithm to efficiently predict the monostatic radar cross-section (mono-RCS) of complex objects over a wide angular range and frequency band. Using only a small-size of the mono-RCS data as the training set to construct the SVR model, the proposed method can predict accurate mono-RCS of complex objects under arbitrary incident angle over the entire three-dimensional space. In addition, the wideband prediction capability of the method is significantly enhanced by incorporating the meta-heuristic algorithm GWO. Numerical experiments verify the efficiency and accuracy of the proposed SVR-GWO model over a wide frequency band. |
| Author(s): | Z. Zhang, P. Wang, M. He |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 8 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 13038 KB |
| Title: | Wideband MIMO Directional Antenna Array with a Simple Meta-material Decoupling Structure for X-Band Applications |
| Abstract: | In this paper, a compact wideband MIMO directional antenna array with a single-layered meta-material is proposed to realize high isolation. The meta-material decoupling structure, which is composed of a modified split-rings and a square loop structure, is suspended over the two antenna elements to reduce the mutual coupling. The achieved results show that the proposed antenna array owns a −10 dB impedance bandwidth ranging from 8.5 GHz to 11.5 GHz. Furthermore, by loading the proposed meta-material superstrate over the two-element MIMO antenna, the designed MIMO antenna array not only has good performance but also enhances the isolation to be more -15 dB within the operating frequency band. In addition, the performances of the proposed antenna array are also tested by radiation pattern, gain, envelope correlation coefficient, diversity gain, total active reflection coefficient and so on. Therefore, these simulation results prove that the proposed wideband MIMO directional antenna array is a suitable candidate for X-band communication. |
| Author(s): | J. Jiang, Y. Li, L. Zhao, X. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Wideband Microstrip Patch Antennas with Transverse Electric Modes |
| Abstract: | A wideband microstrip patch antenna, exciting the fundamental transverse electric (TE) mode, is investigated. The excitation of the TE mode is facilitated through replacing both of the patch and ground plane of a conventional microstrip antenna with artificial magnetic conductors (AMC), consisting of unipolar compact photonic bandgap (UC-PBG) unit cells. The AMC patch and the ground plane of this antenna behave as magnetic conductors within the bandgap region of the unit cells. Similar to conventional patch antennas, it is shown that by cutting a U-shaped slot in the AMC patch, wideband characteristics are realized. The antenna shows a 40% impedance bandwidth and operates at the TE10 mode. Moreover, the width of the patch is 1.75 times smaller than its length, reducing the overall size of the antenna by about 60%, compared with the conventional U-slot PEC antenna supporting the transverse magnetic (TM) mode. |
| Author(s): | T. Mitha, M. Pour |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 8 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1356 KB |
| Title: | Wideband Microstrip Patch Antennas with Transverse Electric Modes |
| Abstract: | A wideband microstrip patch antenna, exciting the fundamental transverse electric (TE) mode, is investigated. The excitation of the TE mode is facilitated through replacing both of the patch and ground plane of a conventional microstrip antenna with artificial magnetic conductors (AMC), consisting of unipolar compact photonic bandgap (UC-PBG) unit cells. The AMC patch and the ground plane of this antenna behave as magnetic conductors within the bandgap region of the unit cells. Similar to conventional patch antennas, it is shown that by cutting a U-shaped slot in the AMC patch, wideband characteristics are realized. The antenna shows a 40% impedance bandwidth and operates at the TE10 mode. Moreover, the width of the patch is 1.75 times smaller than its length, reducing the overall size of the antenna by about 60%, compared with the conventional U-slot PEC antenna supporting the transverse magnetic (TM) mode. |
| Author(s): | T. Mitha, M. Pour |
| File Type: | Express Journal Paper |
| Issue: | Volume: 35 Number: 8 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 410 KB |
| Title: | Wideband Microstrip Endfire Antenna based on SIW and Magnetic Dipole |
| File Type: | Conference Paper |
| Issue: | Volume: 1-P1-C Wideband and Multiband Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 420 KB |
| Title: | Wideband LTCC Vertical-Fed Dipole Antenna for Millimeter-Wave Applications |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-B Millimeter Wave and Terahertz Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 529 KB |
| Title: | Wideband Low Profile Multi-Polarization Reconfigurable Antenna with Quasi-cross-shaped Coupling Slot |
| Abstract: | A wideband low profile multi-polarization reconfigurable antenna with quasi-cross-shaped coupling slot is proposed. The antenna consists of an upper oval radiating patch, the quasi-cross-shaped coupling slot, fork-shaped folded feed lines and a reconfigurable Wilkinson power divider network with four pairs of p-in diodes. The antenna reconfigurable polarization modes change among ±45° Linear polarization (LP), dual-LP, left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) by controlling the ON/OFF states of the p-i-n diodes. The designed prototype has been fabricated and measured. Good agreement between the measured and simulated results is achieved. Measured results show that the antenna has wide impedance bandwidth (over 21.35% for LP and 17.70% for CP) and axial ratio (AR) bandwidth (16.13% for LHCP and 16.88% for RHCP). The average realized gains are about 7.6 dBi for different polarization modes. The proposed antenna has the advantages of multi-polarization reconfigurable ability, wide bandwidth, low profile, and high gains, which make it possible to be applied to wireless communication systems. |
| Author(s): | Q. Xu, Z. Liu, S. Liu, X. Kong, Z. Huang, B. Bian, Q. Yu, J. Qin |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 3 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1903 KB |
| Title: | Wideband Iris-Fed Patch Antenna Under Operation of Dual-Resonance for X-band Applications: MOM-GEC Approach |
| Abstract: | In this paper, a microstrip patch antenna fed by a waveguide using an end-wall iris through ground plane has been modelled. The iris feed technique was proposed to overcome the narrow bandwidth problem of microstrip patch antenna. The iris is sized so that it is resonant and subsequently the antenna operates under the fusion of two modes relating to the iris and the patch, resulting in a wideband radiation characteristic with dual resonance. Measurement demonstrates the single bandwidth dual resonance type and the radiation bandwidth of (8 GHz-10.6 GHz). In order to show the impact of the iris feed technique on microstrip patch antenna’s bandwidth, a comparison with some state-of-the-art works proposing various bandwidth enhancement techniques in the X-band is made. The proposed prototype, with a size of 1.76λ0×1.65λ0×1.29λ0, is more compact than several designs. It has a fractional bandwidth of 27.9%, thus it presents the prototype with the widest bandwidth with the simplest design fabrication. With regard to the electromagnetic modelling, this work is oriented towards the use of the hybrid MOM-GEC method in order to be able to perform a rigorous electromagnetic. It has been found that the MOM-GEC model is more efficient in terms of memory requirements and approximately four times faster than HFSS simulator software. |
| Author(s): | M. Abdi, T. Aguili |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 2 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 4305 KB |
| Title: | Wideband High-Gain Fabry-Perot Resonator Antenna with Small Footprint Dielectric Superstrates and a Conical Short Horn |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-B Modeling, Optimization and Design of Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 421 KB |
| Title: | Wideband Hexagonal Fractal Antenna on Epoxy Reinforced Woven Glass Material |
| Abstract: | In this paper a novel hexagonal-circular Fractal antenna is proposed for wideband applications. The proposed antenna is made of iterations of a circular slot inside a hexagonal metallic patch with a transmission line and is fabricated on low cost epoxy matrix reinforced woven glass material. Measurement shows that with a dimension of 0.36?0×0.36?0×0.0071?0 (where ?0 is the lower edge frequency of the operating band), the proposed antenna achieves a wide impedance bandwidth ranging from 1.34 GHz to 3.44 GHz (88%). The proposed antenna also achieves high gain and exhibits a stable radiation pattern which makes it suitable for many wireless communications such as DCS-1800, PCS-1900, IMT-2000/UMTS, ISM (including WLAN), Wi-Fi and Bluetooth. |
| Author(s): | M. A. Dorostkar, R. Azim, M. T. Islam, Z. H. Firouzeh |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 6 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 902 KB |
| Title: | Wideband GCPW-Fed Dielectric Resonator Antenna for WLAN Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Broadband Antennas and Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 412 KB |
| Title: | Wideband Filtering Crossover Based on Ring Resonator with Sharp Rejection |
| Abstract: | A wideband filtering crossover based on ring resonators with sharp rejection is proposed in this paper. Four transmission zeros near the crossover passband can be adjusted conveniently by the even/odd-mode characteristic impedance of the coupled lines. A high selectivity wideband filtering crossover located at 3.0 GHz is designed and fabricated for verification. Good filtering performance and high selectivity for the crossover are realized and experimentally verified. |
| Author(s): | W. Yang, W. Feng, W. Che |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 10 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2101 KB |
| Title: | Wideband Fabry-Perot Cavity Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-B Modeling, Optimization and Design of Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 350 KB |
| Title: | Wideband Equivalent Circuit Model and Parameter Computation of Automotive Ignition Coil Based on Finite Element Analysis |
| Abstract: | This paper presents a coupled fieldcircuit method to predict the wideband characteristic of ignition coils. A lumped circuit model is proposed, which separates the winding of ignition coil into individual sections. In this circuit model, the capacitance between sections, turn-toturn series capacitance of each single section and inductance of winding are calculated by Finite Element Analysis (FEA). This parameter identification is based on the energy principle. In addition, this paper analyzes the influence of frequency on the magnetic-flux distribution and the inductance, using the finite-element model with T- ? formulation. The parameter inductance applied to the circuit model is classified into high frequency inductance and low frequency inductance. Through contrasting the measured and calculated result in frequency and time domain, reliability and feasibility of the presented method in this paper is verified. |
| Author(s): | J. Jin, W. Quan-di, Y. Ji-hui, Z. Ya-li |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 7 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 1059 KB |
| Title: | Wideband Dual-polarized Vivaldi Antenna with Gain Enhancement |
| Abstract: | A wideband dual-polarized Vivaldi antenna covering 1.85-18.3 GHz band with enhanced gain is presented in this letter. The proposed antenna consists of two Vivaldi antenna elements (VAEs), which are designed based on the conventional Vivaldi antenna. Dual-slot structure is employed to improve the gain of the conventional Vivaldi antenna. As a result, sphericallike waves across the slot aperture of the conventional Vivaldi antenna can be transformed to be plane-like waves and thus gain enhancement can be achieved. In order to extend lower frequency limit of the VAE, elliptical slots are adopted. The proposed dual-polarized Vivaldi antenna is obtained by combining two VAEs in a cross-shaped form. The prototype is simulated, fabricated, and measured. A good agreement between EM simulated and measured results evidently validates the proposed antenna. |
| Author(s): | H. Lv, Q. Huang, J. Hou, J. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 9 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2769 KB |
| Title: | Wideband Dielectric Resonator Antenna with Parasitic Strip |
| File Type: | Conference Paper |
| Issue: | Volume: Dielectric Resonator Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 270 KB |
| Title: | Wideband Dielectric Resonator Antenna Excited by a Closed Circular Loop GCPW Slot for WLAN 5.5 GHz Applications |
| Abstract: | A dielectric resonator antenna is designed for WLAN 5.5 GHz band applications in this study. The dielectric resonator antenna is fabricated on a cheap FR4 substrate with grounded CPW (GCPW) structure. A new closed circular loop GCPW slot structure is employed to obtain wideband impedance matching. Results of the designed dielectric resonator antenna show that good agreement between simulated and measured reflection coefficients, radiations, and antenna gains is observed. The measured -10 dB bandwidth of the dielectric resonator antenna is 1.6 GHz (28.5%, 4.8 – 6.4 GHz), which covers the WLAN 5.5 GHz band. |
| Author(s): | W.-C. Weng, M.-C. Chang, M.-S. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1811 KB |
| Title: | Wideband Decoupled 8-Element MIMO Mobile Phone Antenna for Sub-6GHz 5G NR Bands |
| Abstract: | A broadband decoupled dual antenna pair suitable for sub-6G mobile terminal application is proposed and designed. The multiple input multiple output (MIMO) antenna pair is arranged on the metal frame of the mobile phone, with two antenna pairs on each metal frame. The slotted antenna element structure and defect ground decoupling structure are used to achieve wide band and high isolation. Based on the decoupled antenna pair, an eight-element MIMO antenna is designed. Similarly, the coupling between antenna pairs is effectively reduced by etching the decoupled defect structure of a zigzag shape on the system surface. The prototype of the antenna array is successfully fabricated and tested. Simulation and experimental results show that the proposed eight-element MIMO antenna can fully cover the n77/n78/n79 band of 5G New Radio and 5 GHz band of WLAN. The overall efficiency of the antenna is 50%- 75%, the envelope correlation coefficient (ECC) is below 0.08, and the isolation between any two ports is better than 11 dB. |
| Author(s): | J. He, S. Zhu, J. Yu, H. Li, G. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 12 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1119 KB |
| Title: | Wideband Center-fed Stacked Patch Circularly Polarized Antenna used in Phased Array |
| Abstract: | A center-fed circularly polarized stacked patch antenna (CF-CPSPA) with enhanced axial-ratio (AR) bandwidth is proposed in this paper. The antenna is composed of two microstrip patches, the lower patch consists of a circular pad, an elliptical-ring, and two branch lines connecting them, which is used to realize the center-fed condition, and the upper patch is an elliptical patch to achieve the wide band performance. Firstly, two center-fed linearly polarized stacked patch antennas with wide band are designed, one mode radiated with x polarization, and the other generates y polarized radiation. Next, the orthogonal modes of two linearly polarized antennas are combined together by a specific design. Finally, the approximate equal amplitude and quadrature phase difference of the introduced modes are achieved in the operating frequency band with proper parameters analysis. And the impedance bandwidth and 3dB AR bandwidth is improved to 30.4% and 16.5%. |
| Author(s): | J. Wang, X. Liu, P. Zhang, Z. Xu, A. Li, Z. Chen, J. Fan |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 4563 KB |
| Title: | Wideband and High Gain Shared-Aperture Fabry-Perot Resonator Microstrip Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 2-P2-E Antennas with Advanced/Artificial Materials and Processes Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 386 KB |
| Title: | Wideband and Dual-Band Loaded Monopole Dielectric Resonator Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Antenna Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Wide-Angle Claerbout Scheme for Three-Dimensional Time Domain Parabolic Equation and its CN, ADI, AGE Solutions |
| Abstract: | The wide-angle Claerbout scheme of three-dimensional time domain parabolic equation (Claerbout-TDPE) is derived in this paper, which can provide accurate results at angles within 25° of the paraxial direction. At first, the Crank-Nicolson (CN) type is introduced to discretize the Claerbout-TDPE. In this way, a three-dimensional EM scattering problem can be divided into a series of two-dimensional ones. Moreover, the alternating direction implicit (ADI) type is utilized to the Claerbout-TDPE. In this way, a three-dimensional EM scattering problem can be further reduced to a series of one-dimensional ones. Furthermore, the alternating group explicit (AGE) type is introduced to the Claerbout- TDPE for higher computational efficiency. Comparisons are made among the CN, ADI and AGE types in the numerical results. |
| Author(s): | Z. He, H.-C. Yin, R.-S. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1847 KB |
| Title: | Wide-Angle Absorbing Boundary Conditions for Low and High-Order FDTD Algorithms |
| Abstract: | Wide-angle performance of the perfectlymatched- layer absorbing boundary conditions for the finite-difference time-domain (FDTD) method is investigated for efficient modeling of electrically large structures. The original split-field, uniaxial and convolutional perfectly-matched-layer formulations are all optimized to produce near-flat absorption for incidence angles up to 87 degrees. Optimized wide-angle parameters are derived for both the standard FDTD method and a high-order finite-volumes-based variant. The investigated high-order algorithm in particular is shown to produce improved wide-angle performance over standard FDTD for all three perfectly-matched-layer variants even when they are optimized for normal wave incidence. In all cases, optimization is managed through appropriate choices of modeling parameters which can be directly and unobtrusively applied to existing FDTD codes. |
| Author(s): | Mohammed F. Hadi |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 1 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 113 KB |
| Title: | Wide Stop-Band Microstrip Lowpass Filter with Sharp Roll-off Using Hairpin Resonators |
| Abstract: | A compact microstrip lowpass filter with wide stop-band and sharp roll-off skirt is presented. The structure consists of a combination of modified Hairpin units. The cut-off frequency is 3.1 GHz. The proposed low-pass filter has a very good performance such as extended stop-band bandwidth from 3.36 GHz to 21.5 GHz with the insertion-loss higher than -20.0 dB, sharp roll-off, low insertion-loss, and high return-loss in the passband. The filter is designed, fabricated, and tested and the measured results are in good agreement with the EM-simulation results. |
| Author(s): | M. Hayati, H. S. Vaziri |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 10 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1113 KB |
| Title: | Wide Bandwidth Endfire Antenna with Log-Period Directors |
| Abstract: | This paper presents the design and implementation of a novel wide bandwidth endfire antenna with log-periodic directors. The feeding structure of the proposed antenna includes a balun which is formed using a pair of microstrip-to-slotline transitions. The proposed antenna has three resonant frequencies in the operating frequency band. Both simulation and measurement results show that the operating frequency band of the antenna for S11 < -10 dB covers the wide bandwidth (5 GHz – 10 GHz), and the relative bandwidth is 67%. Far field measurements in azimuth plane and elevation plane show that the radiation patterns are stable and end fire within the operating band at frequencies of 5 GHz, 7 GHz, 8 GHz, 10 GHz. The proposed antenna radiates a well-defined endfire beam, with a front-to-back ratio > 18 dB and cross polarization level below -28 dB. The dimension of the proposed antenna is 26 mm × 27 mm. Good return loss and radiation pattern characteristics are obtained and measured results are presented to validate the usefulness of the proposed antenna structure for wide bandwidth endfire applications. |
| Author(s): | Y. Sun, G. Wen, H. Jin, P. Wang, Y. Huang, J. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 957 KB |
| Title: | Wide Band Wide Scanning Angle Phased Array Antenna Design in Ku-band |
| File Type: | Conference Paper |
| Issue: | Volume: 1-P1-C Wideband and Multiband Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 242 KB |
| Title: | Wide Band Flexible Terahertz Metasurface Wave Plate |
| File Type: | Conference Paper |
| Issue: | Volume: 1-SP-4 Metasurfaces/Metamaterials Theory, Design and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 388 KB |
| Title: | Wide Band Antenna with Ultra-smooth Spectral Characteristics |
| File Type: | Conference Paper |
| Issue: | Volume: S09 Advances in Electromagnetic Modeling by WIPL-D - I Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 389 KB |
| Title: | Wide Band Antenna with Ultra-smooth Spectral Characteristics |
| Abstract: | Understanding the evolution of Universe is, in the forefront of, the modern day observational cosmology. It requires precise and accurate measurement of cosmological signal, orders of magnitude weaker than the bright sky background. Detection of such a signal having distinct spectral signature, needs an antenna with frequency independent characteristics over more than an octave bandwidth. A spherical monopole antenna has been designed to operate in the frequency range 50-200 MHz with a spectral smoothness of about few parts in 104. The structure has been modeled and optimized using WIPL-D, to minimize spectral features arising out of abrupt reflections of surface currents and frequency dependent radiation patterns. A prototype has been built to validate the design. This paper presents the methodology adopted in the overall antenna design, experiences in its prototyping and simulation and the measurement results. |
| Author(s): | A. Raghunathan, B. S. Girish, R. Somashekar, K. S. Srivani, S. Singh, R. Subrahmanyan, N. U. Shankar, M. S. Rao, J. Nambissan T. |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1331 KB |
| Title: | Why does SBVH outperform KD-tree on parallel platforms? |
| File Type: | Conference Paper |
| Issue: | Volume: S41 Parallel and GPU Computations Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 191 KB |
| Title: | Whistler Mode Wave Refractive Index in a Finite Temperature Anisotropic Plasma Medium |
| Abstract: | Whistler mode waves, which exist in a magnetized plasma, are prevalent in the Earth's magnetosphere in the extremely low frequency (ELF) and very low frequency (VLF) bands (100 Hz - 30 kHz). Due to the impact of whistler mode waves on space weather processes, it is important to accurately predict the propagation trajectory of these waves and their properties. Numerical raytracing determines the power flow path of the whistler mode waves in the anisotropic medium of the magnetosphere based on local calculation of the refractive index. In the majority of previous work, magnetospheric raytracing has been implemented assuming a cold background plasma (0 K). However, a more accurate description of the magnetospheric plasma includes a background temperature of about 1 eV (11600 K). We present solutions to the dispersion relation that include the effects of finite electron and ion temperatures on the wave refractive index using a warm plasma formulation. Finite temperature effects of the background plasma are shown to be most significant for highly oblique wave normal angles where the refractive index is bounded to smaller values than in the ideal cold plasma approximation. |
| Author(s): | M. Golkowski, A. Maxworth |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 10 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1848 KB |
| Title: | Whistler Mode Wave Numerical Raytracing in a Finite Temperature Anisotropic Plasma Medium |
| File Type: | Conference Paper |
| Issue: | Volume: S39 Modeling Electromagnetic Waves in Plasma Environments Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 273 KB |
| Title: | Whispering Gallery Mode Laser in an Elliptical Microring |
| Abstract: | Studies on whispering gallery mode (WGM) laser in microrings have been limited to circular geometry. Elliptical microring lasers, despite their potential engineering use, have not been analyzed to guide experiments. This paper introduces a computationally efficient method for determining the WGM laser resonance and the laser field distribution in an elliptical microring. An analytical method is applied to avoid computing high order Mathieu functions. Both WGM resonant frequencies and electromagnetic (EM) field distributions are computed and presented in this paper. Computed results clearly show that the WGM laser field is concentrated on the outer surface of the microring. Results also show that the eccentricity of the ellipse affects the distribution of resonant frequencies and the laser field. |
| Author(s): | R. Baktur, L. W. Pearson, J. M. Ballato |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 2 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 419 KB |
| Title: | What Do You Mean By a Solution to an Operator Equation? |
| Abstract: | The main thrust of this presentation is to illustrate that for many electromagnetic field problems the quality of the solution is very subjective and not objective at all. Therefore to classify solutions on a subjective criteria which is not scientific will create more problems than it would solve. The underlying feature to all this is what do "we mean" by a solution. |
| Author(s): | T.K. Sarkar, E. Arvas, T.K. Sarkar, E. Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 4 Number: 3 Year: 1989 |
| Download Link: | Click here to download PDF File Size: 333 KB |
| Title: | Well-Conditioned CFIE for Scattering from Dielectric Coated Conducting Bodies above a Half-Space |
| Abstract: | In this paper, a well-conditioned coupled combined-field integral equation called the electric and magnetic current combined-field integral equation (JCFIE-JMCFIE) is proposed for the analysis of electromagnetic scattering from coated targets above a lossy half-space. The halfspace multilevel fast multipole algorithm (MLFMA) is used to reduce computational complexity. The inner-outer flexible generalized minimal residual method (FGMRES) was used as the iterative solver to further speed up the convergence rate. Numerical results were presented to demonstrate the accuracy and efficiency of the proposed method. |
| Author(s): | D. Ding, J. Ge, R. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 11 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 401 KB |
| Title: | Well-Conditioned 2D Models of Rod Arrays for Accelerating 3D Simulations of Photonic Crystals and Plasmonic Structures |
| File Type: | Conference Paper |
| Issue: | Volume: S06 Advanced Methods for Numerical Electromagnetic Analysis - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1009 KB |
| Title: | Wearable Textile Fabric Based 3D Metamaterials Absorber in X-Band |
| Abstract: | In this paper, a new wearable (flexible) textile fabric-based 3D metamaterials absorber (MMA) structure is proposed. The proposed MMA was created from three layers; weft-knitted fabric, silicone, and plain weave fabric and then, it was simulated in Computer Simulation Technology (CST). It was obtained maximum absorption power (99.66%) at 9.38 GHz, and the average absorption power of 81-95% was obtained in the frequency range of 8 to 12 GHz depending on the incident angle in the simulation. The effect of the wearable textile structure on absorption was investigated. When compared with other materials, it can be said that the proposed MMA is broadband, incident angle independent, TE and TM polarization-independent, flexible, breathable, wearable, ease of fabrication, practical, low weight, and cost advantage. With this designed the textile fabric-based MMA, it can be obtained both low reflection coefficients and low transmission coefficients at broadband X-band frequencies. This provides a good solution for the cloaking of radar systems. |
| Author(s): | E. Delihasanlar, A. H. Yuzer |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 2 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1722 KB |
| Title: | Wearable Radar Antenna Array Design on Flexible PCB for Visually Impaired People |
| File Type: | Conference Paper |
| Issue: | Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 304 KB |
| Title: | Wearable Panda-Shaped Textile Antenna with Annular Ring-Defected Ground Structure for Wireless Body Area Networks |
| Abstract: | This research presents a compact pandashaped wearable antenna with a defected ground structure (DGS). It is fabricated using a flexible material to work at 2.4-GHz industrial scientific medical (ISM) band, confirming the wireless body area network (WBAN) application requirements. The annular ring DGS and circular and elliptical slots in the patch aid in achieving the operating frequency. Good impedance bandwidth is maintained during on-body and bending analysis. Furthermore, this antenna exhibits a peak gain of 7.3 dB and a minimum specific absorption rate (SAR) of 0.0233 W/kg for 1 g tissue and 1.02 W/kg for 10 g tissue. The investigation shows that an antenna with good robustness, compact, high flexibility, and very low SAR makes it a strong candidate for WBAN applications. |
| Author(s): | T. Annalakshmi, S. Ramesh |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 5 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3568 KB |
| Title: | Wearable Graphene Based Curved Patch Antenna for Medical Telemetry Applications |
| Abstract: | In order to explore the expediency of graphene for biotelemetry in Wireless Body Area Network (WBAN), conformal square patch antenna design has been presented in this paper. The operational efficiency of the antenna is attributed to the incredible properties of graphene as patch conductor. The proposed antenna designed for operating in band from 1-4.88 GHz is fed with microstrip line and quarter wave transformer for impedance matching. The antenna however achieves best performance at 2.4 GHz in ISM band with good impedance matching, reasonable dB gain and high radiation efficiency for the wideband of frequencies in GHz range. The proposed wearable conformal graphene based antenna is optimally positioned at distance from body to make it suitable for Ultra Wide Band (UWB) health monitoring systems fulfilling the requirements of wideband operation, high gain and improved radiation efficiency at reduced SAR. |
| Author(s): | R. Bala, R. Singh, A. Marwaha, S. Marwaha |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 5 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 798 KB |
| Title: | Wearable Antennas for Body-Centric Communications: Design and Characterization Aspects |
| Abstract: | Wearable antennas exhibit numerous challenges in terms of design and optimization due to the specific environment in which they operate. Therefore, the design of such antennas is a non-trivial task, as multiple constraints have to be satisfied. We present an algorithm for design-and-optimization of flexible wearable antennas with high radiation efficiency and low specific absorption rate, that takes into account the dielectric loading of the human body. It provides a list of feasible antenna designs, not just a single solution, and identifies the optimal wearable antenna design. Numerical examples on the design and optimization of a wearable antenna (based on a dipole structure with a reflector) to demonstrate the validity and efficiency of the proposed algorithm are given. The optimal antenna design shows robust on-body performance and provides a suitable balance between small antenna size (antenna surface is 2214 mm2), high radiation efficiency (57.73%), and low value of the maximum 10 g average SAR (0.112 W/kg) on a homogeneous semisolid phantom. Finally, the optimal antenna design is fabricated. The antenna performance is studied under different conditions: on a homogeneous semisolid phantom, on a liquid phantom, on a three-layer semisolid phantom, on a human arm and in the free space. A good agreement between simulated and measured antenna performance is observed. |
| Author(s): | A. G. Al-Sehemi, A. A. Al-Ghamdi, N. T. Dishovsky, N. T. Atanasov, G. L. Atanasova |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1835 KB |
| Title: | Wearable and implantable RFIDs for Human-body Sensing |
| File Type: | Conference Paper |
| Issue: | Volume: RFIday 2010 Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 149 KB |
| Title: | Ways to Improve Computational Efficiency of GRE |
| File Type: | Conference Paper |
| Issue: | Volume: High Frequency Techniques Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 437 KB |
| Title: | Waveport Modeling for DGTD Method and Its Applications |
| File Type: | Conference Paper |
| Issue: | Volume: 2-SE-3 Advances in Electromagnetic Theory and Simulation Techniques II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 7 KB |
| Title: | Wavelet Packet Transform with Iterative Technique based on Method of Moments |
| File Type: | Conference Paper |
| Issue: | Volume: MoM and Applications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 211 KB |
| Title: | Wavelet Packet Transform of the Method of Moments Matrix for Large-Scale Problems |
| File Type: | Conference Paper |
| Issue: | Volume: MoM and Applications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 191 KB |
| Title: | Wavelet Model of Multivariate Prior Covariance |
| File Type: | Conference Paper |
| Issue: | Volume: S59 Uncertainty Quantification and Modeling for Complex Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 397 KB |
| Title: | Wavelet Analysis of Permanent Magnet Synchronous Machine Flux Density Harmonic Content With Different Pole Number Designs |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in CEM Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 372 KB |
| Title: | Waveguides with Hyperbolic Metasurface Claddings |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 588 KB |
| Title: | Waveguides with Hyperbolic Metasurface Claddings |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Methods in Nanoelectromagnetics Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 588 KB |
| Title: | Waveguide Mode Computation through Smoothed Particle Electromagnetics |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling, Design and Optimization of Complex Electromagnetic Systems Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 160 KB |
| Title: | Waveguide Microwave Imaging: Solids Volume Fraction of Particulate Materials |
| Abstract: | An original modeling-based microwave imaging technique for determining the volume fraction of solid material in dielectric powders is described. The desired characteristic is determined by analyzing S-parameter measurements in a waveguide containing the sample with the help of an artificial neural network trained by data from 3D FDTD simulation. The powder sample is represented by a mixture of air and millimeter-scale particles reproduced in the FDTD model. Computational tests with 20 to 40 mm cubic samples of SiC and ZrO2 powders in WR340 show that the solids volume fraction is determined with less than 5% error. |
| Author(s): | A. V. Brovko, E. K. Murphy, V. V. Yakovlev |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 2551 KB |
| Title: | Waveguide Filter Modeling and Simulation using Mode-matching, Fullwave Network Analysis and Swarm Optimization |
| Abstract: | This paper presents the modeling of waveguide bandpass filter synthesis. It consists of a combination of the most appropriate and reliable methods and techniques of analysis, simulation and optimization used in determined order and leading to a fast and accurate method of filter synthesis. An example of a forth-order filter synthesis is given, employing a symmetric configuration and symmetric response. The obtained results, reference measurement and commercial software simulator results are compared for validation. |
| Author(s): | I. Bouchachi, J. Mateu, M. L. Riabi |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 2 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1964 KB |
| Title: | Wavefront Reconstruction Using a Dispersive Propagation Model |
| File Type: | Conference Paper |
| Issue: | Volume: Inverse Scattering in Medicine and Biology - State of the Art, Recent Advances and Future Trends Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 146 KB |
| Title: | Waveform of Class E Power Amplifiers with PI Network |
| File Type: | Conference Paper |
| Issue: | Volume: 4-1-C Passive/Active Microwave and Terahertz Devices Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 242 KB |
| Title: | Wave Propagation on a Circular Chiral Rod |
| File Type: | Conference Paper |
| Issue: | Volume: Guided Waves in Non-Standard Media Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 84 KB |
| Title: | Wave Propagation and Radio Network Planning Software WinProp added to the Electromagnetic Solver Package FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Modeling with FEKO Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 972 KB |
| Title: | Wave Propagation Along a Thin Vertical Wire Antenna Placed in a Horizontally Layered Medium |
| File Type: | Conference Paper |
| Issue: | Volume: Fundamental Electromagnetics: Materials and Boundaries Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 261 KB |
| Title: | Wave Concept Iterative Process Merges with Modal Fast Fourier Transformation to Analyze Microstrip Filters. |
| Abstract: | A novel iterative method based on the concept of waves is reported for use in the field theory, computer aided design and optimization of high frequency integrated circuits. It consists of a recursive relationship between a given source and reflected waves from the discontinuity plane which is divided into cells. A high computational speed has been achieved by using Modal Fast Fourier Transformation (MFFT). The theory as well as its procedure implementation is described. Numerical results are succussfully compared with published data. |
| Author(s): | A. Gharsallah, R. Garcia, A. Gharbi, H. Baudrand, A. Gharsallah, R. Garcia, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 1 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 459 KB |
| Title: | Wave Concept in MoM-GEC Formalism |
| File Type: | Conference Paper |
| Issue: | Volume: S34 Computational Electromagnetics Advanced Algorithms and Emerging Applications IV Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 173 KB |
| Title: | Wave Characteristics Of Layered Anisotropic Media for Remote Sensing Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S49 EM Modeling and Applications - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 169 KB |
| Title: | Water-based Metamaterial Absorber for Broadband Electromagnetic Wave Absorption |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-C Properties, Modelling and Novel Concepts of Artificial Electromagnetic Structures I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 521 KB |
| Title: | Water Extraction of SAR Image Based on Region Merging Algorithm |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-E Synthetic Aperture Radar Techniques and Applications I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 314 KB |
| Title: | Water Content and Tissue Composition Effects on Microwave Tomography Results |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave Imaging and Inverse Problems Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 310 KB |
| Title: | Waffle Iron Filter Design using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Advances in Electromagnetic Modeling by WIPL-D - II Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 914 KB |
| Title: | W-Band Longitudinal-Slot Coupling Four-Way SIW Power Combiner/Divider |
| File Type: | Conference Paper |
| Issue: | Volume: 3-P3-H Passive/Active Microwave and Terahertz Devices Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 352 KB |
| Title: | W-band High-Gain Antenna Arrays with Low-Loss Gap Waveguide Feeding Network |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-B Modeling, Optimization and Design of Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 832 KB |
| Title: | W-band Electronic Focus-Scanning by a Reconfigurable Transmitarray for Millimeter-Wave Imaging Applications |
| Abstract: | A w-band electronic focus-scanning function, which is desired for high-resolution fast-speed millimeterwave imaging systems, is realized by a reconfigurable transmitarray antenna (RTA). As a two-layer structure, each RTA element is integrated with two packaged PIN diodes symmetrically within a limited area (1.6×1.6mm2). When a linearly polarized electromagnetic wave incidents on this reconfigurable element, an orthogonally polarized transmission wave is generated, with the ability of 1-bit phase adjustment (0°/180°). Using this element, a 32×2 reconfigurable transmitarray is designed and fabricated to realize 1-D steerable focal points in a near-distance focal plane. The measured focal points agree well with the design, illustrating the feasibility of the proposed RTA for w-band microwave imaging systems. |
| Author(s): | X. Pan, F. Yang, S. Xu, M. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Voxel-Based Inverse Methods |
| File Type: | Conference Paper |
| Issue: | Volume: Nondestructive Evaluation and Materials Characterization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 97 KB |
| Title: | Vortex Beam Optimization Design of Concentric Uniform Circular Array Antenna with Improved Array Factor |
| Abstract: | In this paper, an improved array factor of the concentric uniform circular array (CUCA) antenna is proposed for the orbital angular momentum (OAM) vortex beam optimization design. From the perspective of the radiation pattern’s power conservation principle, a correction factor is introduced to the conventional array factor of CUCA. Then, based on the improved array factor, by adjusting the rings’ radii parameters of the CUCA, we optimize the vortex beam’s sidelobe level through the generic algorithm (GA). Two different CUCA antenna model are calculated as examples to further illustrate the effectiveness of the improved array factor. Subsequently, an electromagnetic simulation model of two rings CUCA antenna is built at C band for generating low sidelobe vortex beam carrying OAM mode. The electromagnetic simulation model of the designed CUCA antenna is also fabricated and measured. The corresponding antenna far-field vortex beam radiation pattern and near-field vortex wave electric field distributions are measured. The simulation results and the measurement results are in good agreement. The proposed designs of antenna and OAM vortex beam regulation are expected to be used for 5G and 6G communications applications. |
| Author(s): | Q. Feng, Y. Lin, Y. Zheng, L. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 7 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1726 KB |
| Title: | VOLUME LOADING -- A NEW PRICIPLE FOR SMALL ANTENNAS |
| Abstract: | Volume loading means placing conductively enclosed volumes at the ends of the arms of a short linear antenna to increase and control the capacitance of the structure. This technique allows tuning the antenna to make it series-resonant at a design frequency for which it is electrically small. This paper describes the discovery and development of the concept, gives some computed examples to illustrate the relation between shape and performance, and describes some experimental work, including a 900 MHx corless phone demonstration design. |
| Author(s): | D.B. Miron, D.B. Miron |
| File Type: | Journal Paper |
| Issue: | Volume: 14 Number: 2 Year: 1999 |
| Download Link: | Click here to download PDF File Size: 662 KB |
| Title: | Voltage Parameter Identification of AC Overhead Transmission Lines by Using Measured Electric Field Data |
| Abstract: | With the development of smart power grids, the demand for real-time voltage monitoring along overhead transmission lines (OTLs) has been growing. However, the existing voltage measurement of OTLs by using potential transformers involves formidable difficulties. This study proposes a non-contact measurement method in which the voltages on AC OTLs are inversely calculated on the basis of the measured data of the power frequency electric field under OTLs. To improve the accuracy and stability of the inverse calculation, an accurate mathematical model and modified inverse algorithms are investigated and then a set of feasible approaches are proposed. First, considering an overhead conductor’s actual physical form and the meteorological conditions of its operating environment, a 3-D catenary model is built, and the mathematical relations between 3-D electric fields and the voltages on OTLs are identified. Second, the improved particle swarm algorithm is used to search the optimal measurement positions of the electric field to improve the ill-posedness of inverse problems. Third, the iterative Tikhonov regularization method, in which the number of iterations is considered as the variable, is adopted to further improve the ill-posedness of inverse problems and reduce the susceptibility of regular solutions to regularization parameter alpha. Fourth, root mean square values and phase parameters of AC voltages are identified from the sinusoidal fitting curves obtained by the real-time inverse calculation. Results of the simulation and experiment examples show that inverse solutions of high precision can be obtained under the condition with relatively high errors of electric field measurement. Moreover, the advantages of the proposed inversion method, such as fast computing speed and good stability, are demonstrated. |
| Author(s): | D. Xiao, Q. Zheng, Y. Xie, Q. Ma, Z. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 8 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1840 KB |
| Title: | Voltage and Current Analysis for Arcing Detection on AC Overhead Electrified Railways |
| File Type: | Conference Paper |
| Issue: | Volume: Numerical Techniques for Electromagnetic Applications Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 135 KB |
| Title: | Vivaldi Antenna for GPR |
| File Type: | Conference Paper |
| Issue: | Volume: Novel Antennas Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 156 KB |
| Title: | Visualizing Time-Domain Distributed Electromagnetic Fields Using Sonnet |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications in Sonnet Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 755 KB |
| Title: | Visualization of Electric Field Amplitudes inside Porous Spherical Cavity Resonators |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using WIPL-D Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 1752 KB |
| Title: | Visualization of Electric and Magnetic Fields Inside Circular and Baffle Waveguides |
| File Type: | Conference Paper |
| Issue: | Volume: S10 Educational Electromagnetics Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 410 KB |
| Title: | Virtual Source Modeling of the High-Frequency Scattering of the Infinite Conducting Strip under Cylindrical Wave Excitation |
| File Type: | Conference Paper |
| Issue: | Volume: Macromodeling for EMC and SI Complex Systems Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 136 KB |
| Title: | Virtual Design of Insulation Elements Based on FEM and Automated Optimization Process |
| File Type: | Conference Paper |
| Issue: | Volume: Hybrid CEM Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 201 KB |
| Title: | Vibration Isolation of Magnetic Suspended Platform with Double Closed-loop PID Control |
| Abstract: | In magnetic vibration isolation field, magnetic force is used for the isolation, while the whole isolation system is always supported passively, which have non-control shortcomings. Aimed at this problem, a novel active control strategy with a double closed-loop PID algorithm was designed in this paper. The double closed-loop strategy includes an internal and external loop control, which was designed to fulfill the magnetic levitation and isolation, respectively. Firstly, the vibration isolation strategy proposed in this paper was simulated in both time and frequency domain. The simulation results showed that this method possesses good performance of vibration isolation. Then, an active levitation and vibration isolation control experiment was designed. The experimental results showed that the control algorithm has a good vibration control effect under periodic vibration and random vibration conditions. |
| Author(s): | M. Tang, J. Zhou, C. Jin, Y. Xu |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 8 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2261 KB |
| Title: | Via Modeling in Multi-Gbits/s Signal Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: Black Box Modeling Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 334 KB |
| Title: | VHF-UHF Monocone Antenna for Ground Penetrating Radar Application |
| Abstract: | This paper introduces a VHF-UHF monocone antenna for ground penetrating radar GPR application. The proposed antenna covers different bandwidths through only changing the cone geometry. Same ground plane shape and feeding system are used. Firstly, both conventional and proposed monocone antennas are designed, simulated and their simulated results are compared. One antenna cone is fabricated and measured for verification purpose. Good agreement is obtained between measured and simulated bandwidths. The measured bandwidth extends from 73 MHz to 500 MHz. Secondly, another antenna cone is designed and simulated without altering the upper or the lower cone radii. The second cone antenna bandwidth extends from 130 MHz to 1000 MHz. The receiver antenna of the commercial SIR 2000 impulse GPR is replaced by the proposed VHF-UHF first monocone antenna and the field test results are recorded and discussed. |
| Author(s): | T. G. Abouelnaga, E. A. Abdallah |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1931 KB |
| Title: | VHF Antennas on Unmanned Air Vehicles (UAV) for a Simplified Synthetic Aperture Radar (SAR) |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 506 KB |
| Title: | VHF Antenna Modeling for Rocket Application |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO – I Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 182 KB |
| Title: | VFD Approach to the Computation TE and TM Modes in Elliptic Waveguide on TM Grid |
| File Type: | Conference Paper |
| Issue: | Volume: Finite Difference Methods Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 351 KB |
| Title: | VFD Approach to the Computation TE and TM Modes in Elliptic Waveguide on TM Grid |
| Abstract: | We describe here a vector finite difference approach (VFD) to the evaluation of eigenvalues and modes of elliptical waveguides. The FD is applied using a 2D elliptical grid in the waveguide section. A suitable Taylor expansion of the vector mode function allows to take exactly into account the boundary condition. To prevent the raising of spurious modes, our FD approximation results in a constrained eigenvalue problem, that we solve using a decomposition method. This approach has been evaluated comparing our results to known data for the elliptic case. |
| Author(s): | A. Fanti, G. Montisci, G. Mazzarella, G. A. Casula |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 12 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 515 KB |
| Title: | Versatile Nanoparticle Manipulation with Designer Thermoplasmonic Metasurface |
| File Type: | Conference Paper |
| Issue: | Volume: S48 Computational Nanophotonics: Advanced Numerical Methods and Applications II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1011 KB |
| Title: | VERIFYING WIRE-GRID MODEL INTEGRITY WITH PROGRAM 'CHECK' |
| Abstract: | A wire-grid model of a complex surface such as an aircraft consists of hundreds of "vertex" points joined by hundreds of wires or "links". A wire antenna analysis program such as NEC is used to find the currents on the wires. The formulation within NEC imposes restrictions on the geometry of the wires, which limit the length of "segments" compared to the wavelength, the radius compared to the wavelength, the ratio of the segment length to the radius, and so forth. This paper collects these limitations together into a set of "modeling guidelines". The"integrity" of a wire-grid is its ability to represent the electrical behaviour of the continuous surface that it models. An important aspect of integrity is conformance to the "modeling guidelines". Gross errors creep into complex grids: repeated wires, omitted wires, wires of zero length. More subtle errors which violate the "modeling guidelines" can lead to incorrect current distributions and misleading radiated or scattered fields form the wire-grid when solved with the NEC code. This paper describes a program called CHECK which examines an input geometry file for the NEC program for conformance to the "modeling guidelines" by each individual wire, by wires forming junctions, and by pairs which do not join but are closely spaced. CHECK tabulates "notes", "warnings" and "errors" to aid the user in assessing the degree to which the model satisfies the guidelines. CHECK systematically finds all the guideline violations in a model. CHECK produces lists of wires for display with computer graphics to show the location of each type of problem that CHECK finds. The guideline violations found by CHECK inherently suggest improvements that can be made to the wire-grid. [Vol. 5, No. 2. pp. 17-42 (1990)] |
| Author(s): | C. W. Trueman, S. J. Kubina, C. W. Trueman, S. J. Kubina |
| File Type: | Journal Paper |
| Issue: | Volume: 5 Number: 2 Year: 1990 |
| Download Link: | Click here to download PDF File Size: 1753 KB |
| Title: | Verifying Received Power Predictions of Wireless InSite Software in Indoor Environments at WLAN Frequencies |
| Abstract: | This paper introduces a study on verifying received power at WLAN frequencies in indoor environments, Wireless InSite is a popular electromagnetic ray-tracing software which is widely used for predicting channel behaviour in indoor and outdoor environments. The study compares software-generated data with measurements collected through 3rd floor Chesham Building, University of Bradford, at WLAN frequencies, the paper also investigates the effect of changing settings on results accuracy and computational time, and finally, the paper presents a comparison between simulation results with empirical models. |
| Author(s): | H. A. Obeidat, O. A. Obeidat, M. F. Mosleh, A. A. Abdullah, R. A. Abd-Alhameed |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1903 KB |
| Title: | Verify Microstrip Antenna Using Feature Selective Verification Method |
| File Type: | Conference Paper |
| Issue: | Volume: 4-3-B Antenna Design and Optimization Techniques I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 463 KB |
| Title: | Verification Testing of Multi-Dynamical Solver for Multiferroic Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: S42 Computational Methods Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 433 KB |
| Title: | Verification of the CADRCS RCS tool for NCTR work |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling, Inversion and Applications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 228 KB |
| Title: | VERIFICATION OF SOFTWARES FOR ELECTROMAGNETIC FIELD ANALYSIS USING MODELS PROPOSED BY INVESTIGATION COMMITTEES IN IEE OF JAPAN |
| Abstract: | In order to investigate methods for analyzing electromagnetic fields and to compare the accuracy and the CPU time of various codes and so on, investigation committees were set up in IEE of Japan. In this paper, the activities of various investigation committees relating electromagnetic field analysis are described from the viewpoint of the verification of software. [Vol. 12, No. 3 (1997), pp 50-61 |
| Author(s): | Norio Takahashi, Norio Takahashi |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 3 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 793 KB |
| Title: | Verification of Nonlinear Characteristics of Radar Angular Glint by Surrogate Data Method |
| Abstract: | In this paper, we present a nontrivial verification of nonlinear characteristics of angular glint by the surrogate data method. Glint is a key cause of target loss in radar detections. Prediction and suppression of glint is a hot topic. Firstly, glint data of a typical target are calculated by GRECO method for two motions. As glint is calculated by quadric surface calculations, it is nonlinear in mathematical nature. The surrogate data method is explained and workflow is summarized to verify the nonlinear traits of glint. Surrogate methods of phase randomized Fourier transform and amplitude adjusted Fourier transform are illustrated. Test statistics of higher order moments and time reversibility are given. Lorenz model is simulated as a standard nonlinear model to verify effectiveness of workflow, and nonlinear verification criteria are drawn. A new parameter is designed to measure the powerfulness of nonlinearity. Finally, nonlinear verifications for the two angular glint series are given. Results are illustrated in figures and data and they agree with nonlinear criterion. This paper lays the foundations for chaotic verifications of glint. |
| Author(s): | J. Zhang, Z. Li, C. zheng, J. Miao |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 10 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 997 KB |
| Title: | Vector Parabolic Equation Modeling of Wireless Propagation in Tunnels with Statistically Rough Surface Walls |
| File Type: | Conference Paper |
| Issue: | Volume: S59 Uncertainty Quantification and Modeling for Complex Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 524 KB |
| Title: | Vector Parabolic Equation Modeling of Wireless Propagation in Tunnels with Statistically Rough Surface Walls |
| File Type: | Conference Paper |
| Issue: | Volume: S10 Student Paper Competition II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 524 KB |
| Title: | Vector Parabolic Equation Method for the EM Scattering from PEC Objects in Half-Space |
| Abstract: | The vector parabolic equation method was widely used to analyze the electromagnetic scattering from electrically large PEC objects in free space. In this paper, it is applied for the analysis of the electromagnetic scattering from PEC objects in halfspace. By introducing both the incident field and the reflected field to illuminate the objects, the vector parabolic equation method can be used to efficiently calculate the radar cross-section of PEC objects with electrically large size in half-space. The numerical results demonstrate that the proposed method can efficiently give reasonably accurate results. |
| Author(s): | Z. He, T. Su, R. S. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 8 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1155 KB |
| Title: | Vector Hysteresis Modeling in Arbitrarily Shaped Objects Using an Energy Minimization Approach |
| Abstract: | It is known that proper and efficient modeling of vector hysteresis is crucial to the precise design and performance estimation of electric power devices and magnetic recording processes. Recently, discrete Hopfield neural networks have been successfully utilized in the construction of vector hysteresis models. This paper presents a novel energy-minimization Hopfield neural network approach to implement Stoner-Wohlfarthlike vector hysteresis operators in triangular sub-regions. Advantages of the approach stem from the nonrectangular nature of such operators, which could mimic major hysteresis loops as well as their implementation in the most commonly used triangular discretization subdomains. Details of the approach are given in the paper. |
| Author(s): | A. A. Adly, S. K. Abd-El-Hafiz |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1305 KB |
| Title: | Vector Control of PMSM Take Over by Photovoltaic Source |
| Abstract: | This article established with the modeling and the field oriented control of permanent magnet synchronous machines, with a focus on their applications in variable speed domain in photovoltaic source. |
| Author(s): | T. Yuvaraja, K. Ramya |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 6 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2266 KB |
| Title: | Vector Control of PMSM Take Over by Photovoltaic Source |
| Abstract: | This article established with the modeling and the field oriented control of permanent magnet synchronous machines, with a focus on their applications in variable speed domain in photovoltaic source. |
| Author(s): | T. Yuvaraja, K. Ramya |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1641 KB |
| Title: | Vector Control of PMSM Take Over by Photovoltaic Source |
| Abstract: | This article established with the modeling and the field oriented control of permanent magnet synchronous machines, with a focus on their applications in variable speed domain in photovoltaic source. |
| Author(s): | T. Yuvaraja, K. Ramya |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1641 KB |
| Title: | VARIOUS APPROACHES TO TORQUE CALCULATIONS BY FEM AND BEM |
| Abstract: | Different algorithms for the torque calculation by Maxwell stress method (MSM) are dealt with in the paper. The aim of designing these algorithms was to reduce the influence of the choice of the integration path and discretization of the air gap between the stator and rotor on the accuracy of the results. In some of these algorithms the connection between the stator and rotor is released For the magnetic field calculation the finite element method (FEM), boundary element method (BEM), and hybrid finite element - boundary element method (HM) were used. The calculation results were tested on a permanent magnet DC motor and a single phase brushless motor. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 127-130] |
| Author(s): | Mladen Trlep, Anton Hamler, Bozidar Hribernik, Mladen Trlep, Anton Hamler, Bozidar Hribernik |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 321 KB |
| Title: | Variational Analysis of Substrate-Integrated Waveguides with Longitudinal Slot |
| File Type: | Conference Paper |
| Issue: | Volume: S43 Advanced Applications I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 290 KB |
| Title: | Variable Phase-Shifter/Down Converter for Active Microstrip Phased Array Antenna Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 1063 KB |
| Title: | Validation, Verification and Calibration in Applied Computational Electromagnetics |
| Abstract: | Model validation, data verification, and code calibration (VV&C) in applied computational electromagnetics is discussed. The step by step VV&C procedure is given systematically through canonical scenarios and examples. Propagation over flat-Earth with linearly decreasing vertical refractivity profile, having an analytical exact solution, is taken into account as the real-life problem. The parabolic wave equation (PWE) is considered as the mathematical model. MatLab-based numerical simulators for both the split step Fourier and finite element implementations of the PWE are developed. The simulators are calibrated against analytical exact and high frequency asymptotic solutions. Problems related to the generation of reference data during accurate numerical computations are presented. |
| Author(s): | G. Apaydin, L. Sevgi |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 12 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 1225 KB |
| Title: | Validation, Verification and Calibration in Applied Computational Electromagnetics |
| File Type: | Conference Paper |
| Issue: | Volume: CEM for EM Education Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 755 KB |
| Title: | VALIDATION OF, AND LIMITATIONS ON, THE USE OF NEC-4 FOR RADIATION FROM ANTENNAS BURIED WITHIN A HOMOGENEOUS HALF-SPACE |
| Abstract: | The use of the computer program NEC-4 for the simulation of radiation from buried antennas is considered. NEC-4 uses the “exact” Sommerfield integral formulation for stratified media (in NEC-4, re-stricted to an homogeneous half-space). Although the formulation is rigorous, certain approximations have to be made for numerical implementation. The formu-lation, and some of these issues, is outlined in the paper. Several validation examples comparing results computed using NEC-4 and results available in the lit-erature are presented for antennas buried in various typical media, including ground, fresh water, and the sea. Satisfactory agreement has generally been obtained; where differences have been noted, we have able to explain most in terms of approximate implementa-tion issues. |
| Author(s): | David B. Davidson, H. du Toit Mouton, David B. Davidson, H. du Toit Mouton |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 3 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 554 KB |
| Title: | VALIDATION OF THE NUMERICAL ELECTROMAGNETICS CODE (NEC) FOR ANTENNA WIRE ELEMENTS IN PROXIMITY TO EARTH |
| Abstract: | This paper summarizes recent MITRE efforts to validate the NEC-3 and NEC-GS versions of the Numerical Electromagnetics Code (NEC) developed by Lawrence Livermore National Laboratory for predicting the performance of antenna wire elements in close proximity to flat earth. In an early version (NEC-l), the effect of the air-ground interface was included by applying a plane-wave Fresnel rei:lection coefficient approximation to the field of a point source. The NEC-2 version, while still retaining the Fresnel reflection coefficient model as an option, provides a more accurate ground model by numerically evaluating Sommerfeld integrals. The version NEC-3 extends the NEC-2 version to cases for bare wire segments below the air-earth interface. Version NEC-GS utilizes rotational symmetry to provide a more efficient version of NEC-3 for the case of a monopole element with a uniform radial wire ground-screen (GS). Results of the various versions are compared with each other and with other mndels. The input-output format of the NEC-GS version is discussed. It is concluded that the NEC-3 Sommerfeld integral option in the NEC-GS version is the best available model for monopole elements with electrically small radial-wire ground planes. [Vol. 8, No. 2 (1993), pp 44-71] |
| Author(s): | M. M. Weiner, M. M. Weiner |
| File Type: | Journal Paper |
| Issue: | Volume: 8 Number: 2 Year: 1993 |
| Download Link: | Click here to download PDF File Size: 1395 KB |
| Title: | Validation of Fast Site-Specific Mean-Value Models for Indoor Propagation |
| Abstract: | A fast assessment of the local mean value of the electric field strength throughout a floor plan is useful for the design of local-area networks. Site-specific models require coding the location of walls, doorways, and other features and modelling their structure and electrical properties. Using ray tracing to find the field strength throughout the floor plan is slow and expensive because a grid of closely-spaced points is needed to trace the rapid variations called fast fading; then the raytracing local area average is found by explicit spatial averaging, to obtain the slow fading behavior. The raytracing mean value is obtained by combining the amplitudes of the fields associated with the rays on an energy basis; widely-spaced grid points can be used because the local mean value varies slowly with position, making the calculation fast and inexpensive. The Sabine method provides a energy-balance approach for an inexpensive estimate of the local mean value field strength. This paper tests the accuracy of the fast methods (the ray-tracing mean value and the Sabine mean value) against the local area average found from dense ray tracing, and against measurements. In a 40 m2 room of roughly square floor plan, the fields from the fast methods were close to those of dense ray tracing and to the measurements. But it is shown that in a long corridor, the ray-tracing mean value and the Sabine mean value were low compared to dense ray tracing, and so these fast methods should be used with caution. |
| Author(s): | C. W. Trueman, D. Davis, B. Segal, W. Muneer |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 3 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 264 KB |
| Title: | Validation of a Z-Matrix Finite Element Program for Analyzing Electrostatic Fields |
| Abstract: | Modern electrical equipment designs demand more compact, complex geometries and require more strigent analyses of the associated three-dimensional electrostatic fields. Analytical solutions of such fields are limited to relatively simple geometries. Numerical solutions using the finite element method are limited by available computer storage and processing time. Lauber posed an economical method for solving three-dimensional finite element electrostatic fields by forming the finite element system matrix using Brown's Z-matrix techniques. (Lauber, 1982) (Brown, 1975) This method was implemented by a FORTRAN computer program. (Barber and Lauber, 1986) (Barber, 1988) The purpose of this paper is to briefly describe the present version of the program called FEWZ (Finite Elements using a Windown and the Z-matrix) and to show how it was validated. |
| Author(s): | P.F. Barber, T.S. Lauber, E.D. Patterson, P.F. Barber, T.S. Lauber, E.D. Patterson |
| File Type: | Journal Paper |
| Issue: | Volume: 4 Number: 3 Year: 1989 |
| Download Link: | Click here to download PDF File Size: 945 KB |
| Title: | VALIDATION AND DEMONSTRATION OF FREQUENCY APPROXIMATION METHODS FOR MODELING DISPERSIVE MEDIA IN FDTD |
| Abstract: | Recently, digital signal processing techniques were used to design, analyze and implement discrete models of polarization dispersion for the Finite-Difference Time-Domain (FDTD) method. The goals of the present work are to illustrate the FDTD update equations for these techniques and to validate and demonstrate these techniques for one-dimensional problems involving reflections from dispersive dielectric half-spaces. Numerical results are compared with several other dispersive medial FDTD implementations. |
| Author(s): | J.H. Beggs, J.H. Beggs |
| File Type: | Journal Paper |
| Issue: | Volume: 14 Number: 2 Year: 1999 |
| Download Link: | Click here to download PDF File Size: 484 KB |
| Title: | Validating the Magnetostatic Frill Source with WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using Wipl-D Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 267 KB |
| Title: | Valence Electron High-harmonic Generation Analysis by the Finite Difference Time Domain Method |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-A Multiphysics Modeling and Simulation Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 162 KB |
| Title: | V-Band Frequency Reconfigurable Cavity-Based Bandpass Filters |
| File Type: | Conference Paper |
| Issue: | Volume: S55 Nanotechnology Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 410 KB |
| Title: | V Transmission lines Frequency Operation Band |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave, Optical Devices, and Propagation Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 384 KB |
| Title: | UWB-MIMO Quadruple with FSS-Inspired Decoupling Structures and Defected Grounds |
| Abstract: | In this paper, a quad element Ultra Wideband Multiple-Input Multiple-Output (UWB-MIMO) antenna system is presented. The proposed design is compact as it has four semielliptical shaped antennas along with the decoupling structures, fabricated on a compact substrate. The substrate employed is a low cost FR-4 laminate. The antenna elements are decoupled by employing Defected Ground Structures (DGS) and structures inspired from Frequency Selective Surfaces. An enhanced impedance match over lower to medium band is achieved by introducing dipole-like parasitic stubs on rear sides of the antennas. Measured results show that the isolation achieved by the proposed design is more than 20 dB over desired frequency band. |
| Author(s): | T. Shabbir, R. Saleem, A. Akram, F. Shafique |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 2 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1186 KB |
| Title: | UWB Square Monopole Antenna with Omni-Directional Radiation Patterns for Use in Circular Cylindrical Microwave Imaging Systems |
| Abstract: | In this paper, a novel ultra-wideband printed monopole antenna (PMA) for the use in a circular cylindrical microwave imaging system is presented. The proposed antenna consists of a square radiating patch and a ground plane with a pair of L-shaped slots and two L-shaped conductor back plane, which provides a wide usable fractional bandwidth of more than 130 % (3.02 GHz - 15.21 GHz). By cutting two modified Lshaped slots with variable dimensions on the ground plane corners and also by inserting two Lshaped conductor back plane on the other side of the substrate, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band. The proposed antenna has an ordinary square radiating patch, therefore displays a good omni-directional radiation pattern even at higher frequencies, and also its radiation efficiency is greater than 82% across the entire radiating band. The designed antenna has a small size of 12 × 18 mm2. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for circular cylindrical microwave imaging system. |
| Author(s): | N. Ojaroudi, M. Ojaroudi, N. Ghadimi, M. Mehranpour |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 2 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 542 KB |
| Title: | UWB Slot Antenna with Band-Stop Operation by Using H-Shaped Parasitic Structures for UWB Applications |
| Abstract: | A novel ultra wideband (UWB) printed slot antenna with band-notched performance is designed and manufactured. In order to increase the impedance bandwidth of the slot antenna, we use a rectangular slot with an H-shaped parasitic structure inside the rectangular slot on the feedline that with this structure UWB frequency range can be achieved. Additionally, by using a square ring radiating stub with a rotated H-shaped parasitic structure inside the square ring, a frequency band-stop performance has been obtained. The designed antenna has a small size of 20 × 20 mm2 while showing the radiation performance in the frequency band of 2.97 GHz to over 12.39 GHz with a band rejection performance in the frequency band of 5.01 GHz to 5.98 GHz. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range. |
| Author(s): | M. Ojaroudi, N. Ojaroudi, N. Ghadimi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 12 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 448 KB |
| Title: | UWB Slot Antenna with Band-Notched Property with Time Domain Modeling based on Genetic Algorithm Optimization |
| Abstract: | This paper presents a kind of band-notched slot antenna with time domain designing method for ultra-wideband (UWB) applications. The proposed antenna consists of a square radiating stub with a defected mircostrip feed-line using an M-shaped step impedance resonator (SIR) slot and a defected ground plane with a pair of inverted U-shaped slots. By cutting two inverted U-shaped slots in the ground plane, a new resonance at the higher frequencies is excited and hence much wider impedance bandwidth can be produced that. To generate a band-notched characteristic, we use an M-shaped slot at the feed-line. The proposed antenna can operate from 3.03 to 13.21 GHz with frequency band-notched function in 7.28-7.79 GHz to avoid interference from downlink of X-band satellite communication systems. To verify the validation of the proposed antenna an equivalent circuit based on time domain reflectometry (TDR) analysis is presented. In addition, the accuracy of the equivalent circuit models have been improved using Genetic algorithm optimization (GAP). Detailed simulation and numerical investigations are conducted to understand their behaviors and optimize for broadband operation. The proposed antenna exhibits almost omni-directional radiation patterns in UWB frequency range and could be used in wireless systems. |
| Author(s): | J. Zolghadr, Y. Cai, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 8 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1770 KB |
| Title: | UWB Monopole Antenna with WLAN Frequency Band-Notched Performance by using a Pair of E-Shaped Slits |
| Abstract: | In this paper an ultra-wideband monopole antenna with frequency band-stop performance is designed and manufactured. The proposed antenna consists of square radiating patch with two E-shaped slits and a ground plane with a protruded T-shaped strip inside the rectangular slot. In the proposed structure, by inserting a rectangular slot with a T-shaped strip protruded inside the slot on the ground plane, additional resonance is excited and hence, much wider impedance bandwidth can be produced, especially at the higher band. In order to create band-rejected function we use two E-shaped slits in the square radiating patch. The fabricated antenna has the frequency band of 3 GHz to over 12.7 GHz with a rejection band around 5 GHz – 6 GHz. Good VSWR and radiation pattern characteristics are obtained in the frequency band of interest. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for UWB applications |
| Author(s): | N. Ojaroudi, M. Ojaroudi, N. Ghadimi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 12 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 403 KB |
| Title: | UWB Monopole Antenna with Switchable Band-Notch Characteristic Using a Novel MEMS Afloat |
| Abstract: | In this paper, a novel microelectro-mechanical system (MEMS) U-shaped afloat is designed and used instead of a simple slot to activate and deactivate the band notch characteristic of an ultra wideband (UWB) monopole antenna at the WLAN band (5.15-5.825 GHz) without extra DC bias lines. The novelty of this work is design of MEMS afloat that can stay in down state permanently. When the dc actuation voltage, about 20 volts, is applied to the microstrip center line, the ?/2 long U-shaped afloat moves down and creates a slot (resonating element) in its vacant place. Whereas no voltage is applied, the afloat remains in the up position and serves as a part of the antenna, which eliminates the resonance. The proposed design for MEMS afloat has least negative effect on gain, reflection coefficient, and pattern of the antenna. The gain of the antenna is about 3.2 dBi over the entire UWB frequency band (3.1-10.6 GHz), while it decreases sharply over 7 dB at the rejection band. More-over, the time-domain characteristics of the antenna is investigated, which shows 1 ns delay over the UWB frequency band for 20 cm. Due to a novel afloat design, the addition of the resonance element does not affect on the radiation performance, reflection coefficient, gain, and group delay of the antenna outside of notched band frequencies. |
| Author(s): | A. Nemati, B. A. Ganji |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 12 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1070 KB |
| Title: | UWB Monopole Antenna with Dual Band-Stop Performance Using G-Shaped SRR and SIR Structures at Feed Line |
| Abstract: | This article presents a new design of ultra-wideband monopole antenna with the characteristics of dual band rejection .The antenna consists of a circular radiating patch, a feed-line with G-shaped Step-Impedance Resonator (SIR) slot and Split-Ring Resonator (SRR) structure, and a ground plane which provides a wide usable fractional bandwidth of more than 120% with two notch bands around 5.15-5.35 GHz and 7.25-7.75 GHz, to avoid interferences from High Performance Radio Local Area Networks (HIPERLAN) and downlink frequency of X-band satellite systems. The simulated and measured results show that the antenna design exhibits an operating bandwidth (VSWR<2) from 2.86 to 12.92 GHz, excluding the rejected bands. The proposed antenna configuration is simple, easy to fabricate and can be integrated into any UWB system. The antenna has an ordinary circular-disc radiating patch, therefore displays good omnidirectional radiation patterns, even at higher frequencies. |
| Author(s): | S. Ojaroudi, Y. Ojaroudi, N. Ghadimi, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 10 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 761 KB |
| Title: | UWB Monopole Antenna with Dual Band-Notched Function |
| Abstract: | In this letter, an Ultra-Wideband (UWB) monopole antenna with dual frequency band-stop performance is designed and manufactured. In the proposed structure, by inserting an S-shaped parasitic structure inside a square slot in the ground plane a new resonance at higher frequencies can be achieved, which provides a wide usable fractional bandwidth of more than 125%. In order to generate dual bandnotched function, we use four L-shaped strips protruded inside square ring. The measured results reveal that the antenna offers a very wide bandwidth from 2.63 to 14.2 GHz with two notched bands covering all the 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX and 4 GHz C bands. Good VSWR and radiation pattern characteristics are obtained in the frequency band of interest. |
| Author(s): | Y. Ojaroudi, S. Ojaroudi, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 2 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 523 KB |
| Title: | UWB MIMO Antenna with Decoupling Strip for 5G Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 624 KB |
| Title: | UWB Microstrip-Fed Slot Antenna with Band-Rejection Performance Using an SRR Conductor-Backed Plane |
| Abstract: | In this article, a novel and compact ultra-wideband (UWB) slot antenna with bandnotched function is presented. This antenna consist of a square radiating stub, a 50? microstrip feedline, a ground plane with a pair of rotated Tshaped strips protruded inside square slots and a Split Ring Resonator (SRR) conductor-backed plane. In this design, by cutting a pair of modified square slots with rotated T-shaped strips protruded inside slots, additional resonance is excited and hence much wider impedance bandwidth can be produced. In order to achieve a band-notched function, an SRR parasitic structure was inserted in the ground plane. The measured results show that the proposed antenna can achieve the Voltage Standing Wave Ratio (VSWR) requirement of less than 2.0 in frequency range from 3.1 GHz to 13.15 GHz, with band-rejection performance of 5.08 GHz to 6 GHz, to avoid interference from WLAN communications. The presented microstrip-fed slot antenna exhibits good radiation behavior. The antenna has a small size. |
| Author(s): | N. Ojaroudi, N. Ghadimi, Y. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 3 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 691 KB |
| Title: | UWB Gain Enhancement of Horn Antennas Using Miniaturized Frequency Selective Surface |
| Abstract: | In this work, enhancement of the radiation performances of horn antennas are worked out within their operation bandwidth by placing the miniaturized Frequency Selective Surface (FSS)s perpendicularly into the inner part of their flares. Here each FSS consists of only a single miniaturized double-sided inverted Tshaped square unit cell designed on the low-cost FR4 with relative permittivity 4.4, loss tangent 0.0035 and thickness 1.58 mm in 3D CST environment so that it is able to focus the propagating electromagnetic waves to increase the directivity properties like a dielectric lens, while keeping the mismatching characteristics with less size and low manufacturing cost compared to its counter parts. Herein an exponentially tapered TEM horn with the operation bandwidth of 5-13 GHz is taken as an example horn antenna for measurements. From the measured results of the prototyped module, it can be observed that the proposed module keep mismatching characteristics of the horn antenna, meanwhile the gain and beam widths are enhanced to amplify the signal in the operation band without any increase in the total volume of the module or making the design bulky. Thus, it is expected that this methodology can be implemented to horn antennas effectively reducing volume and cost of communication systems. |
| Author(s): | M. A. Belen, F. Gunes, P. Mahouti, A. Belen |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 9 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2272 KB |
| Title: | UWB Compact TEM Ridged Horn Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Application of Electromagnetic Simulation for Designing and Analysis of Antennas and Radio Propagations Part I Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 322 KB |
| Title: | Utilizing Hybrid Dielectric-Metal and Mesh Refinement Techniques When Modeling a MMIC in Concerto Quickwave |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling with QuickWave/Concerto Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 344 KB |
| Title: | Utilization of Protruded Strip Resonators to Design a Compact UWB Antenna with WiMAX and WLAN Notch Bands |
| Abstract: | In this paper, a new design of ultrawideband (UWB) microstrip monopole antenna is presented. The main novelty of the proposed structure is the using of protruded strips as resonators to design an UWB antenna with dual band-stop property. In the proposed design, by cutting the rectangular slot with a pair of rotated Y-shaped strips in the ground plane, additional resonance is excited and much wider impedance bandwidth can be achieved. To make a single band-notched function, the square radiating patch is converted to the square-ring structure with a pair of protruded fork-shaped strips. Finally, by cutting a rectangular slot with a protruded M-shaped strip at the feed line, a desired dual band-notched function is achieved. The measured results reveal that the presented dual band-notched antenna offers a very wide bandwidth from 2.8 to 11.6 GHz, with two notched bands, around of 3.3-3.7 GHz and 5-6 GHz covering all WiMAX and WLAN bands. |
| Author(s): | J. Mazloum, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 2 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 684 KB |
| Title: | UTD Shooting-and-Bouncing Extension to a PO/PTD Ray Tracing Algorithm |
| Abstract: | This paper deals with the efficient combination of three well-established electromagnetic modeling methods, a Shooting-and-Bouncing-Rays (SBR) algorithm on the basis of the Geometrical Optics (GO), a source-based calculation of scattered field strengths using Physical Optics (PO) and Physical Theory of Diffraction (PTD), and diffraction calculation on the basis of the Uniform Theory of Diffraction (UTD). While the conventional GO-PO/PTD methods are able to accurately calculate wedge contributions to scattered fields, the further propagation of diffracted rays is generally not considered in SBR approaches. Thus, the aim of this paper is to describe the implementation of diffracted rays according to the UTD concept into an SBR code. This novel implementation allows for the modeling of double diffraction and reflected-diffractedreflected paths in complex scenarios consisting of a very large number of surface elements as well as the accurate simulation of cavities. The comparison with numerically exact reference simulations proves that the proposed hybrid GO/UTD-PO/PTD algorithm yields excellent results and that the UTD-SBR extension definitely improves the simulations of the ray tracing algorithm also for realistic objects. |
| Author(s): | F. Weinmann |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 3 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 526 KB |
| Title: | UTD Ray and Beam Methods for Analysis of Large EM Wave Problems Abstract |
| File Type: | Tutorial Abstract |
| Issue: | Volume: S35 UTD Ray and Beam Methods for Analysis of Large EM Wave Problems Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 92 KB |
| Title: | Using YATPAC for Modeling of a Marchand Balun |
| File Type: | Conference Paper |
| Issue: | Volume: MEFiSTo Modeling and Analysis Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 189 KB |
| Title: | Using Transfer Function Approach To Develop MRI Visible and Low RF Heating Sleeve for Cardiac Applicaion |
| File Type: | Conference Paper |
| Issue: | Volume: S54 Computational Electromagnetic Modeling in EMC Applications Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 300 KB |
| Title: | Using Time-domain Codes to Find RF Cavity Eigenmodes |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Finite Difference Time Domain Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 29 KB |
| Title: | Using System-Theoretical Consideration for Calculating Coupling Effects in Packages |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in CEM Applications I Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 421 KB |
| Title: | Using Superformula to Miniaturize CPW Rat Race Coupler |
| Abstract: | This paper proposes a new CPW rat race coupler whose shape has been meandered using the superformula for size reduction. The coupler operates at a center frequency of 1.8 GHz. The size reduction in the proposed design is about 74% as compared to conventional ring rat race coupler. The bandwidth of the proposed coupler defined by |S11| < -15 dB is about 31.6%. |
| Author(s): | A. A. Omar, N. I. Dib |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 12 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1901 KB |
| Title: | USING NONUNIFORM SEGMENTS LENGTHS WITH NEC TO ANALYZE ELECTRICALLY LONG WIRE ANTENNAS |
| Abstract: | In this paper an electrically long monopole is analyzed using the Numerical Electromagnetics Code, version two (NEC-2). Due to the electrical length of the monopole and the segment length requirement established for the NEC-2 program, the computer memory requirement and computational time become excessive. By successively increasing the segment length with distance from the source, very large structures can be analyzed accurately and efficiently. Various schemes for selecting the segment lengths are considered, and the results are compared to those obtained by using a large number of electrically short segments. This technique of grading segment lengths allows one to employ NEC-2 to analyze other electrically long wire antennas. [Vol. 5, No. 2, pp. 2-16 (l990)] |
| Author(s): | Saad N. Tabet, J. Patrick Donohoe, Clayborne D. Taylor, Saad N. Tabet, J. Patrick Donohoe, Clayborne D. Taylor |
| File Type: | Journal Paper |
| Issue: | Volume: 5 Number: 2 Year: 1990 |
| Download Link: | Click here to download PDF File Size: 689 KB |
| Title: | Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground |
| File Type: | Conference Paper |
| Issue: | Volume: S03 EM Modeling using Feko/WinProp Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 426 KB |
| Title: | Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground |
| Abstract: | This paper compares the theoretical and measured antenna patterns of a slant 45-degree antenna on a rolled edge ground plane. Advantages of using sampled nearfield currents in combination with large element physical optics in determining the reflected far fields will be described. |
| Author(s): | K. Snyder |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1397 KB |
| Title: | Using MATLAB’s Parallel Processing Toolbox for Multi-CPU and Multi-GPU Accelerated FDTD Simulations |
| Abstract: | MATLAB is a good testbed for prototyping new FDTD techniques as it provides quick programming, debugging and visualization capabilities compared to lower level languages such as C or FORTRAN. However, the major disadvantage of using MATLAB is its slow execution. For faster simulations, one should use other programming languages like Fortran or C with CUDA when utilizing graphics processing units. Development of simulation codes using these other programming languages is not as easy as when using MATLAB. Thus the main objective of this paper is to investigate ways to increase the throughput of a fully functional finite difference time domain method coded in MATLAB to be able to simulate practical problems with visualization capabilities in reasonable time. We present simple ways to improve the efficiency of MATLAB simulations using the parallel toolbox along with the multi-core central processing units (CPUs) or the multiple graphics processing units (GPUs). Native and simple MATLAB constructs with no external dependencies or libraries and no expensive or complicated hardware acceleration units are used in the present development. |
| Author(s): | A. J. Weiss, A. Z. Elsherbeni, V. Demir, M. F. Hadi |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1792 KB |
| Title: | Using MATLAB to Model Inhomogeneous Media in Commercial Computational Electromagnetics Software |
| Abstract: | This paper presents a new method to model inhomogeneous media in commercial electromagnetics software, especially FEKO. In this method, the inhomogeneous medium is fragmented to some homogeneous pieces. If the size of these pieces is chosen correctly, then the electromagnetic behaviors of them and inhomogeneous medium are the same. Since creating these homogeneous pieces in FEKO manually is very difficult and time consuming, MATLAB is employed to create these pieces in FEKO. |
| Author(s): | A. Farahbakhsh, D. Zarifi, A. Abdolali |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 9 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 511 KB |
| Title: | Using MATLAB to Control Commercial Computational Electromagnetics Software |
| Abstract: | This paper provides details on how to use MATLAB to control some commercial electromagnetics software packages. FEKO is an example that can be directly called from MATLAB. Other commercial software, such as CST Microwave Studio and Ansoft HFSS, require a scripting language interface. An example of a design of an inset rectangular patch antenna is presented using a direct call to FEKO and a Visual Basic for Applications interface to CST Microwave Studio are presented. |
| Author(s): | R. L. Haupt, R. L. Haupt |
| File Type: | Journal Paper |
| Issue: | Volume: 23 Number: 1 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 176 KB |
| Title: | POINT-MATCHED TIME DOMAIN FINITE ELEMENT METHOD APPLIED TO MULTI-CONDUCTOR ELECTROMAGNETIC TRANSIENTS ANALYSIS. |
| Abstract: | A point-matched time domain finite element method (TDFE) applied to the analysis of electromagnetic transients in multi-conductor transmission line network is presented. The TDFE method solves the partial differential transmission line equations based on a semi-discrete approximation using the finite element method and leap-frog scheme. Some oscillations can occur due to the stability condition of the technique. Using the modal analysis these oscillations can be eliminated. A surge propagation in a simple multi-conductor network is presented and the results are compared with the Electromagnetic Transients Program (EMTP) simulations. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 39-43] |
| Author(s): | Glassio Costa de Miranda, Glassio Costa de Miranda |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 319 KB |
| Title: | SELF ADAPTIVE FUZZY SETS IN MULTI OBJECTIVE OPTIMIZATION USING GENETIC ALGORITHMS |
| Abstract: | Optimization in electrical engineering has attracted an increasing attention over the last few years. Various strategies to solve electromagnetic optimization problems have been introduced, amongst them stochastic, deterministic and hybrid ones. Most of today's real world applications, however, involve multiple conflicting objectives which should be considered simultaneously. The aim of this paper is to introduce self adaptive fuzzy sets to treat vector optimization problems. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 26-31] |
| Author(s): | Ch. Magele, G. Furntratt, B. Brandstatter, K.R. Richter, Ch. Magele, G. Furntratt, B. Brandstatter, K.R. Richter |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 428 KB |
| Title: | OPTIMIZATION OF A SMES DEVICE UNDER NONLINEAR CONSTRAINTS |
| Abstract: | In this paper a method to calculate the gradients for the TEAM 22 problem is presented. Furthermore an objective function different from the one proposed in the benchmark is used where the energy requirement was handled as an equality constraint. The so derived gradients of the objective function and the constraints together with a standard optimization routine are used to solve the problem. In the last section some new results concerning the presence of local minima for the problem are given. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 50-53] |
| Author(s): | B. R. Brandstatter, Wolfgang Ring, B. R. Brandstatter, Wolfgang Ring |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 383 KB |
| Title: | A STRONG COUPLING MODEL FOR THE SIMULATION OF MAGNETOMECHANICAL SYSTEMS USING A PREDICTOR/MULTI-CORRECTOR ALGORITHM |
| Abstract: | A recently developed modeling scheme for the numerical simulation of coupled magnetomechanical systems is presented. The scheme allows the calculation of dynamic rigid motions as well as deformations of magnetic and anti-magnetic materials in a magnetic field. The equations governing the magnetic and mechanical field quantities are solved using a combined Finite Element /Boundary-Element-Method (FEM-BEM). To circumvent the nonlinear system of equations resulting from a direct coupling of the magnetic and mechanical systems, the calculation of the magnetic forces is based on predictor values of the magnetic quantities. Therewith, a decoupling into a magnetic and mechanical matrix equation can be achieved. To ensure the strong coupling between the magnetic and mechanical quantities, a sophisticated Predictor/Multicorrector Algorithm is used resulting in an efficient iteration between the two matrix equations within a single time step. Computer simulations of an electromagnetic forming system and a magnetomechanical transducer immersed in an acoustic fluid (acoustic power source) show good agreement between simulation results and measured data. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 102-106] |
| Author(s): | M. Kaltenbacher, H. Landes, R. Lerch, M. Kaltenbacher, H. Landes, R. Lerch |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 347 KB |
| Title: | CALCULATION OF ELECTROMAGNETIC SCATTERING VIA VARIATIONS AND ANALYTIC CONTINUATION |
| Abstract: | In this paper we review a numerical method we introduced recently for the solution of problems of electromagnetic scattering. Based on variations of the boundaries of the scatterers and analytic continuation, our approach yields algorithms which are applicable to a wide variety of scattering configurations. We discuss some recent applications of this method to scattering by diffraction gratings and by large two-dimensional bounded bodies, and we present results of new applications to three-dimensional gratings containing corners and edges. In many cases of practical interest our algorithms give nu- merical results which are several orders of magnitude more accurate than those given by classical methods. [Vol. 11, No. 1 (1996), pp 17- 31, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | Oscar P. Bruno, Fernando Reitich, Oscar P. Bruno, Fernando Reitich |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 1314 KB |
| Title: | MONO-STATIC RCS COMPUTATION WITH A BLOCK GMRES ITERATIVE SOLVER |
| Abstract: | We present a new method of computing mono-static radar cross sections using a preconditioned Block GMRES iterative algorithm. The convergence properties of this algorithm are analyzed using RCS error, equation residual error and solution error. It is found that this method is nearly an order of magnitude faster than direct methods (LINPACK) for realistic method of moment problems. [Vol. 11, No. 1 (1996), pp 63-69, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | William E. Boyse, Andrew A. Seidl, William E. Boyse, Andrew A. Seidl |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 617 KB |
| Title: | MODERN KRYLOV SUBSPACE METHODS IN ELECTROMAGNETIC FIELD COMPUTATION USING THE FINITE INTEGRATION THEORY |
| Abstract: | A theoretical basis for numerical electromagnetics, the so-called Finite Integration Theory, is described. Based upon Maxwell's equations in their integral form, it results in a set of matrix equations, each of which is a discrete analogue of its original analytical equation. Applications of this discretization process are described here in the context of the numerical simulation of electroquasistatic problems and of time-harmonic field computations including a new type of waveguide boundary condition, which is presented here for the first time. In both fields the process of mathematical modelling and discretization yields large systems of complex linear equations which have to be solved numerically. For this task several modern Krylov subspace methods are presented such as BiCG, CGS and their more recent stabilized variants CGS2, BiCGSTAB(I) and TFQMR. They are applied in connection with efficient preconditioning methods. The applicability of these modern methods is shown for a number of examples for both problem types. [Vol. 11, No. 1 (1996), pp 70-84, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | Markus Clemens, Rolf Schuhmann, Ursula van Rienen, Thomas Weiland, Markus Clemens, Rolf Schuhmann, Ursula van Rienen, Thomas Weiland |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 1195 KB |
| Title: | FINITE DIFFERENCE METHODS FOR THE NONLINEAR EQUATIONS OF PERTURBED GEOMETRICAL OPTICS |
| Abstract: | Finite difference methods are developed to solve the nonlinear partial differential equations approximating solutions of the Helmholtz equation in high frequency regime. Numerical methods are developed for solving the geometrical optics approximation, the classical asymptotic expansion, and a new perturbed geometrical optics system. We propose a perturbed geometrical optics system to recover diffraction phenomena that are lost in geometrical optics approximations. We discuss techniques we have developed for recovering multivalued solutions and we present numerical examples computed with finite difference approximations of the above systems. [Vol. 11, No. 1 (1996), pp 90-98, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | E. Fatemi, B. Engquist, and S. Osher, E. Fatemi, B. Engquist, and S. Osher |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 661 KB |
| Title: | A GUIDE TO IMPLEMENTATIONAL ASPECTS OF THE SPATIAL DOMAIN INTEGRAL EQUATION ANALYSIS OF MICROSTRIP ANTENNAS |
| Abstract: | In the analysis of microstrip radiating structures integral equation methods rate among the more accurate approaches. By far the most demanding part in the use of these methods is the actual numerical implementation. This paper presents a detailed illustrated description of the numerical implementation of a spatial domain mixed-potential integral equation analysis of microstrip radiating structures. [Vol. 10, No. 1 (1995), pp 40-51] |
| Author(s): | Louis T. Hildebrand, Derek A. McNamara, Louis T. Hildebrand, Derek A. McNamara |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 1533 KB |
| Title: | MUTUAL VALIDATION OF THREE PROGRAMS FOR NUMERIC ANTENNA COMPUTATIONS |
| Abstract: | The numerical results obtained by three different codes, GALNEC, WARAN and NEC-2 are compared for thin dipoles and thick ones with hemispherical end caps and for arrays of such collinear dipoles. The electric field integral equation and Galerkin's method are used in the code GALNEC where solid thick dipole bodies are implemented. Mei's (1965) integral equation and collocation technique are wed in the code WARAN, where thick dipoles are simulated as arrays of thin wires. Good agreement has been obtained for current distri- butions and input and mutual impedances. [Vol. 10, No. 2 (1995), pp 96-101] |
| Author(s): | Andrew A. Efanov, Harald Schopf, Bernhard Schnizer, Andrew A. Efanov, Harald Schopf, Bernhard Schnizer |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 421 KB |
| Title: | CURRENT-BASED HYBRID MOMENT METHOD ANALYSIS OF ELECTROMAGNETIC RADIATION AND SCATTERING PROBLEMS |
| Abstract: | A current-based hybrid method combining the method of moments (MM) with asymptotic current expansions for the higher frequency range is presented for the analysis of arbitrarily shaped, three-dimensional, perfectly conducting electromagnetic radiation and scattering problems. Some examples demonstrate the drastic saving in memory requirement and CPU-time when applying the hybrid method as compared to the conventional MM. Even though the proposed method is a frequency domain formulation, some time domain results based on a Fourier transform are presented as they show an accurate description of diffracted and creeping waves. [Vol. 10, No. 3 (1995), Special Issue on Advances in the Application of Method of Moments to Electromagnetic Radiation and Scattering Problems, pp 38-46 |
| Author(s): | Ulrich Jakobus, Friedrich M. Landstorfer, Ulrich Jakobus, Friedrich M. Landstorfer |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 3 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 739 KB |
| Title: | PARAMETRIC MAPPING OF VECTOR BASIS FUNCTIONS FOR SURFACE INTEGRAL EQUATION FORMULATIONS |
| Abstract: | A parametric mapping of vector basis functions is presented for curved-patch discretizations of surface integral equations. The mapping of the vector basis function maintains the normal continuity of the surface current density at cell boundaries, and is therefore suitable for use with the electric-field integral equation. Expressions for the matrix elements associated with the electric and magnetic field integral equations are developed. [Vol. 10, No. 3 (1995), Special Issue on Advances in the Application of Method of Moments to Electromagnetic Radiation and Scattering Problems, pp 107-115] |
| Author(s): | Andrew F. Peterson, Keith R. Aberegg, Andrew F. Peterson, Keith R. Aberegg |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 3 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 632 KB |
| Title: | APPLICATION OF THE UMOM FOR THE COMPUTATION OF THE SCATTERING BY DIELECTRICS COATED WITH WEAKLY NONLINEAR LAYERS |
| Abstract: | The paper describes an iterative approach to the computation of the electromagnetic scattering by isotropic, dielectric objects partially made of weakly nonlinear materials The approach is started by using a perturbative moment-method solution based on the Sherman-MorrisonWoodbury formula. The nonlinearity is assumed to be of the Kerr type, i e, the dielectric permittivity depends on the square amplitude of the electric field The bistatic scattering width and the field distribution are computed for some test cases, in particular, for infinite cylinders coated and filled with nonlinear materials The convergence of the medium is numerically evaluated and the results are compared with those obtained by the iterative distorted-wave Born approximation. [Vol. 10, No. 3 (1995), Special Issue on Advances in the Application of Method of Moments to Electromagnetic Radiation and Scattering Problems, pp 139-145] |
| Author(s): | Salvatore Caorsi, Andrea Massa, Matteo Pastorino, Salvatore Caorsi, Andrea Massa, Matteo Pastorino |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 3 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 561 KB |
| Title: | ON THE COMBINATION OF MMP WITH MOM |
| Abstract: | The Multiple Multipole Program (MMP) [1] is based on the Generalized Multipole Technique (GMT) [2]. This method lies between a purely analytic solution and the well-known Method of Moments (MoM) [3]. The goal of this paper is to demonstrate how a combination of MMP with MoM can be achieved for obtaining more powerful codes. The combination presented here is based on an implementation of rooftop functions as a new type of basis function in 3D MMP. Since users of this code are often interested in the close near-field, a special implementation of rooftop functions is presented and tested. (Vol. 9, No. 3 (1994), Special Issue on Generalized Multipole Technique (GMT), pp 18-27] |
| Author(s): | Ch. Hafner, J. Waldvogel, J. Mosig, J. Zheng, Y. Brand, Ch. Hafner, J. Waldvogel, J. Mosig, J. Zheng, Y. Brand |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 3 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 6282 KB |
| Title: | COMPUTER-BASED ELECTROMAGNETlC EDUCATION |
| Abstract: | Computers provide an exciting opportunity for boosting electromagnetic education and corporate training. Animated graphics of the wave propagation phenomenon, visualization of the abstract and highly mathematical subjects, one-on-one and self-paced tutoring, and the ability to mimic often unavailable and expensive laboratory experiments are among the often-cited benefits of a computer-based electromagnetic education. In this paper, we review the activities of the NSF/IEEE Center for Computer Applications in Electromagnetic Education (CAEME). This Center was established to stimulate and accelerate the use of computers and software tools in EM education. A reflection on the extensive software package developed and distributed by the CAEME Center is described and examples of the developed software are presented. To help integrate available EM software in classroom teaching and corporate training, CAEME developed four multimedia lessons for instruction. These interactive media lessons integrate and allow individuals to interactively manipulate information from multimedia sources such as video, software, and animated graphics and also include instructional information such as quizzes and tutorials to help evaluate the students' performance. Features of these lessons are presented, and future developments in the Center's activities are described. [Vol. 8, No. 1, (1993), Special Issue on Computer Applications in Electromagnetics Education, pp 77-107] |
| Author(s): | Magdy F. Iskander, Magdy F. Iskander |
| File Type: | Journal Paper |
| Issue: | Volume: 8 Number: 1 Year: 1993 |
| Download Link: | Click here to download PDF File Size: 4497 KB |
| Title: | ANALYSIS AND COMPUTATION OF LEAKY-WAVE HYPERTHERMIA APPLICATOR |
| Abstract: | The use of electromagnetic waves to induce hyperthermia in cancer therapy has been the subject of intensive research but obtaining good resolution at depth in the abdomen and pelvic regions remains a fundamental problem. This paper investigates the prospects for generating leaky-waves in tissue to improve field penetration and focussing at depth. An approximate analysis based on a planar structure illustrates the feasibility of obtaining good resolution at depth but leaky-wave action in a strict sense is not possible. Measurements on an applicator conformal with the phantom tissue simulated by a saline solution, demonstrate good resolution and penetration but hotspot regions are detected around the launcher region. A three dimensional finite difference time domain (FDTD) computation is performed in Cartesian, circular cylindrical and elliptic cylindrical coordinates to model all the effects for various geometries of the phantom region and different launching symmetries. The results illustrate the need for symmetric launching of the strip, computational convergence and mode diagnostic data, the shape of the focal region and the useful property of being able to shift the focal region by changing frequency. It is concluded that this new quasi-leaky-wave applicator concept is potentially capable of giving improved focal resolution at depth with some positional control and only one generator is required. Optimising the launching of the quasi- leaky waves on the applicator and preventing hotspot regions from creating unwanted tissue heating are remaining practical problems to address. [Vol. 7, No. 2, pp. 72-84 (1992), Special Issue on Bioelectromagnetic Computations] |
| Author(s): | J. R. James, G. Andrasic., J. R. James, G. Andrasic. |
| File Type: | Journal Paper |
| Issue: | Volume: 7 Number: 2 Year: 1992 |
| Download Link: | Click here to download PDF File Size: 2500 KB |
| Title: | TWO-DIMENSIONAL TEMPERATURE RETRIEVAL IN BIOLOGICAL STRUCTURES BY MULTIFREQUENCY MICROWAVE RADIOMETRY: A SOBOLEV-SPACE SOLUTION |
| Abstract: | The problem of retrieving a two-dimensional temperature distribution from radiometric data measured at various frequencies and for different positions of the sensing antenna around the body has been considered. The retrieval has been modelled as an inverse problem whose solution is investigated in a suitably defined functional space which takes regularity properties of temperature functions into account. The retrieval of hot spots in a cylinder at uniform temperature has been numerically analyzed, the examples being relevant in the hyperthermia treatment of malignancies. [Vol. 7, No. 2, pp. 110-120 (1992), Special Issue on Bioelectromagnetic Computations] |
| Author(s): | Fernando Bardati, Valerie J. Brown, Piero Tognolatti, Fernando Bardati, Valerie J. Brown, Piero Tognolatti |
| File Type: | Journal Paper |
| Issue: | Volume: 7 Number: 2 Year: 1992 |
| Download Link: | Click here to download PDF File Size: 740 KB |
| Title: | COMPUTATIONAL METHOD FOR POWER LINE MAGNETIC FIELD EVALUATION |
| Abstract: | The paper reports a model for the power line magnetic field evaluation. The obtained results for three different power lines (380 kV double circuit,380 kV single circuit, 220 kV double circuit) was validated with measurement data. Calculated and corresponding measured data were found in good agreement. The influence of geometrical and electrical power line parameters, such as the spatial configuration of the conductors and line phase sequences, is evaluated and discussed. Data on the influence of adjacent line span on the field are also reported. The method can be used for prediction of human exposure in epidemiological studies. [Vol. 7, No. 2, pp. 148-161 (1992), Special Issue on Bioelectromagnetic Computations] |
| Author(s): | Santi Tofani, Giovanni d'Amore, Giancarlo Bonazzola, Giovanni Fiandino, Santi Tofani, Giovanni d'Amore, Giancarlo Bonazzola, Giovanni Fiandino |
| File Type: | Journal Paper |
| Issue: | Volume: 7 Number: 2 Year: 1992 |
| Download Link: | Click here to download PDF File Size: 740 KB |
| Title: | A HYBRID FINITE ELEMENT FOR CONDUCTORS WITH THIN DENSE COATINGS |
| Abstract: | A hybrid method of using finite elements and boundary integral methods to compute scattering from two dimensional coated conductors is presented. Finite elements are used in and around an electrically dense coating where high sampling rates are required. Since the matrix equations they generate are sparse, they can be quickly solved. The finite element sampling rate is reduced with distance from the scatterer to a very low rate where the boundary integral method provides the exact near field radiation condition. The boundary integral generates a dense matrix which is small due to the reduced sampling. This technique is compared for accuracy and efficiency with series solutions and with method of moments. [Vol. 4, No. 2, pp. 59-72 (1989)] |
| Author(s): | Willlam E. Boyse, Andrew A. Seidl, Willlam E. Boyse, Andrew A. Seidl |
| File Type: | Journal Paper |
| Issue: | Volume: 4 Number: 2 Year: 1989 |
| Download Link: | Click here to download PDF File Size: 982 KB |
| Title: | HYBRID MOM/SBR METHOD TO COMPUTE SCATTERING FROM A SLOT ARRAY ANTENNA IN A COMPLEX GEOMETRY |
| Abstract: | A method of moments (MoM) code has been developed to compute the scattering from a pla-nar or cylindrically conformal slot array antenna. By hybridizing the MoM with the shooting and bouncing ray (SBR) method, the scattering from a large, complex target with a slot array antenna can be computed. The scattering problem can be decomposed using the field equivalence prin-ciple such that the MoM is employed to model the slot array while the SBR method is used to compute the scattering from the large, complex target. Sample results show the utility of the method and the need to include slot array scat-tering when computing the RCS of a complex target. |
| Author(s): | Andrew D. Greenwood, Jian-Ming Jin, Andrew D. Greenwood, Jian-Ming Jin |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 1 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 514 KB |
| Title: | SOME EXPERIENCES IN USING NEC2 TO SIMULATE RADIATION FROM SLOTS ON CYLINDERS |
| Abstract: | A numerical method based on use of the NEC2 code has been used to study radiation from a slot in the surface of a conducting cylinder and the results used in a comparison with the eigenfunction series solu-tion. The two cases of an axial and circumferential slot have been taken as representative between them of the more general case of an inclined slot. In the case of a circumferential slot, truncation of the cylin-der to finite length has been found in all cases to lead to numerical and analytic results which are in poor agreement and this has been accounted for with an argument based on the geometrical theory of dif-fraction. However this alone is not enough to explain what is observed with axial slots where, for small cyl-inders, agreement of the two approaches is good but fails for larger cylinders. It is postulated that this is due to excitation of waveguide modes on the inside of the larger cylinders and the result confirmed by clos-ing the ends of the cylinder in the NEC2 model with a system of radial wires, when agreement is again re-stored. |
| Author(s): | S. H. H. Lim, H. E. Green, C. E. Brander, S. H. H. Lim, H. E. Green, C. E. Brander |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 1 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 422 KB |
| Title: | ON THE BOUNDED PART OF THE KERNEL IN THE CYLINDRICAL ANTENNA INTEGRAL EQUATION |
| Abstract: | The kernel in the cylindrical antenna integral equation was partitioned by Schelkunoff into a com-plete elliptic integral and a bounded integral. This paper gives an exact expression for the bounded part. |
| Author(s): | M. P. Ramachandran, M. P. Ramachandran |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 1 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 343 KB |
| Title: | HIGHLY PARALLEL IMPLEMENTATION OF THE 3D INTEGRAL EQUATION ASYMPTOTIC PHASE METHOD FOR ELECTROMAGNETIC SCATTERING |
| Abstract: | In this paper, we discuss the implementation of the 3D Integral Equation-Asymptotic Phase (IE-AP) method using the parallel architecture IBM RS/6000 SP. The IE-AP method is a hybrid numerical/asymptotic approach for electromagnetic scattering that attempts to reduce the number of unknowns required to accurately model electrically large structures. The IE-AP method will be described, and results will be reported for the parallel matrix fill implementation, and the relative performance of the PESSL and PETSc toolkits for parallel matrix solution. |
| Author(s): | Xianneng Shen, Aaron W. Davis, Keith R. Aberegg, Andrew F. Peterson, Xianneng Shen, Aaron W. Davis, Keith R. Aberegg, Andrew F. Peterson |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 2 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 651 KB |
| Title: | FAST FREQUENCY RESPONSE CALCULATIONS OF CAVITY-BACKED APERTURE ANTENNAS USING HYBRID FEM/MOM TECHNIQUE IN CONJUNCTION WITH MODEL BASED PARAMETER ESTIMATION |
| Abstract: | Model Based Parameter Estimation (MBPE) is presented in conjunction with the hybrid Finite Element Method (FEM)/Method of Moments (MoM) technique for fast computation of the input characteristics of cavity-backed aperture antennas over a frequency range. The hybrid FEM/MoM technique is used to form an integro-partial-differential equation to compute the electric field distribution of a cavity-backed aperture antenna. In MBPE, the electric field is expanded as a rational function of two polynomials. The coefficients of the rational function are obtained using the frequency derivatives of the integro-partial-differential equation formed by the hybrid FEM/MoM technique. Using the rational function approximation, the electric field is calculated and the input characteristics of the antenna are obtained over the frequency range. Numerical results for an open coaxial line and a cavity-backed microstrip patch antenna are presented. Good agreement between MBPE and the solutions over individual frequencies is observed. CPU timings for all numerical calculations are presented. |
| Author(s): | C. J. Reddy, , M. D. Deshpande, B. R. Cockrell, F. B. Beck, C. J. Reddy, , M. D. Deshpande, B. R. Cockrell, F. B. Beck |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 3 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 575 KB |
| Title: | A Hybrid Mom/FEM Technique for Scatter from a Complexe BOR with Appendages |
| Abstract: | A hybrid technique is developed to allow the scattering from small appendages to be approximately combined with the scatter from a large body of revolution (BOR). The hybrid technique thus enables the rotational symmetry of the large BOR to be exploited to solve the scattering problem with much less computational complexitity than a fully three-dimensional (3-D) solution. The technique combines the finite element method (FEM) for BOR scattering with the method of moments (MoM) for small appendages. The hybrid forumlation is discussed in detail, including an approximate Green's function with permits the decoupling of the solutions from the FEM and the MoM. Numerical examples are given to show the applicability and accuracy of the hybrid technique. |
| Author(s): | Andrew D. Greenwood, Jian-Ming Jin, Andrew D. Greenwood, Jian-Ming Jin |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 1 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 2981 KB |
| Title: | Introduction to Genetic Algorithms in Electromagnetics |
| Abstract: | This special issue of the ACES Journal is devoted to nev developments in Genetic Algorithm (GA) applications in computational electromagnetics. Genetic Algorithms have become extremely popular in the computational electromagnetics literature. The papers included in this special issue are very arcane, so I decided to include an unreviewed tutorial overview at the last minute as an introduction for those of you who are at a more basic level. GAs model natural selection and genetics on a computer to optimize a wide range of problems. |
| Author(s): | Randy L. Haupt, Randy L. Haupt |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 2 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 2442 KB |
| Title: | Optimum Population Size and Mutation Rate for a Simple Real Genetic Algorithm that Optimizes Array Factors |
| Abstract: | The population size and mutation rate of a genetic algorithm have great influence upon the speed of convergence. Most genetic algorithm enthusiants use a large population size and low mutation rate due to the recommendations of several early studies. These studies were somewhat limited. This paper presents results that show a small population size and high mutation rate are actually better for many problems. |
| Author(s): | Randy L. Haupt, Sue Ellen Haupt, Randy L. Haupt, Sue Ellen Haupt |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 2 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 9141 KB |
| Title: | On the Implementaion of the Equivalence Theorem in the Hybrid FDTD-MoMTD Technique |
| Abstract: | The hybrid FDTD-MoMTD technique is a powerful tool for analysing the transient excitation of inhomogeneous permeable bodies by arbitrary thin-wire antennas. The technique is based upon the calculation of the equivalent electric and magnetic currents on a Huygen's surface that encloses the antenna. The paper studies, by means of several numerical experiments, the effects on the accuracy of the results of the size of the Huygen's box, the size of the spatial increment in the FDTD algorithm and the distance from the Huygen's surface to the observation point. |
| Author(s): | M. A. Hernandez-Lopez, A. Ruibo Bretones, M. Quintillan, R. Gomez Martin, M. A. Hernandez-Lopez, A. Ruibo Bretones, M. Quintillan, R. Gomez Martin |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 1 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 409 KB |
| Title: | A MICROWAVE IMAGING APPROACH BASED ON AMPLITUDE-ONLY DATA FOR THE RECONSTRUCTIN OF THE ELECTROMAGNETIC FIELD INDUCED IN BIOLOGICAL PHANTOMS |
| Abstract: | In this paper, a microwave imaging technique for the reconstructin of the electromagnetic field distribution inside exposed biological bodies from amplitude-only data is presented. The scattering problem, formulated in terms of integral equations, is recast into an optimization problem after defining a suitable cost function which is proportional to the difference between reconstructed and measured amplitudes of the scattered and of the incident electric fields in the near-field region. The field solution is obtained by minimizing the cost function by means of an hybrid simulated annealing-conjugate gradient based procedure, which, in principle, ensures the convergence to the global minimum, preventing the solution from being trapped in local minima. Moreover, the proposed approach prevents the problems due to inaccuracies in near-field phase measurements. The effectiveness of the microwave imaging approach is assessed by means of some numerical expamples (with synthetic input data) concerning a realistic cross-section of a biological phantom exposed to a TM electromagnetic illumination. The presence of noise on synthetic data is also considered and the dependence of the reconstruction accuracy on the signal-to-noise ratio investigated. Finally, in order to give some indications to further improve the prediction capability of the proposed approach, some preliminary guidelines are pointed out. |
| Author(s): | Salvatore Caorsi, Emanuela Bermani, Andrea Massa, Salvatore Caorsi, Emanuela Bermani, Andrea Massa |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 2 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 1321 KB |
| Title: | Higher Order Spatial Operators for the Finite Integration Theory |
| Abstract: | The Finite Integration Technique (FIT) according to T. Weiland is an efficient and universal method for solving a large scale of problems in computational electrodynamics. Up to now the conventional formulation itself has had an accuracy order of two with respect to the spatial discretization. In this paper an innovative extension to fourth or even higher order is presented. The convergence of the presented scheme is demonstrated by a general dispersion equation and stability issues are discussed. An approach for a stable spatial interface connecting regions of higher order with the standard FIT scheme is proposed. |
| Author(s): | Holger Spachmann, Rolf Schuhmann, Thomas Weiland, Holger Spachmann, Rolf Schuhmann, Thomas Weiland |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 1 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 2009 KB |
| Title: | Methods for the Evaluation of Regular, Weakly Singular and Strongly SingularSurface Reaction Integrals Arising in Method of Moments |
| Abstract: | The accurate and fast evaluation of surface reaction integrals for Method of Moments computations is presented. Starting at the classification of the integrals into regular and weakly, strongly and nearly singular integrals, appropriate methods are presented that handle each. A Gauss-Legendre quadrature rule evaluates regular integrals. For singular integrals, the singularity is lifted or weakened by an extraction of the singularity, a transform to polar coordinates or a domain transform. The resulting regular integral is in turn solved by a quadrature rule. The different methods are finally applied to an example, and the resulting accuracy tested against the analytical result. The presented methods are general enough to be used as integration methods for integrands with various degrees of singularity and is not limited to Method of Moments. |
| Author(s): | Alexander Herschlein, Juergen v. Hagen, Werner Wiesbeck, Alexander Herschlein, Juergen v. Hagen, Werner Wiesbeck |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 1 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 340 KB |
| Title: | Accuracy of currents produced by the locally-corrected Nystrom method and the method of moments when used with higher-order representations |
| Abstract: | The locally-corrected Nyström method is described, and the accuracy of the currents produced by it and the method of moments are compared. Results suggest that when the underlying representation has the same order, the methods are comparable in accuracy. Additional results are presented to illustrate the Nyström approach, and advantages and disadvantages of the method are reported. |
| Author(s): | Andrew F. peterson, Andrew F. peterson |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 1 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 184 KB |
| Title: | High-Order Nystrom Method for Computing Waveguide Modes |
| Abstract: | We report a novel method for accurately computing the modes of an arbitrarily-shaped hollow waveguide. Our method uses a point-based (Nystrom) discretization of an integral operator over the waveguide aperture to compute the modes. |
| Author(s): | J. J. Ottusch, S. M. Wandzura, J. J. Ottusch, S. M. Wandzura |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 1 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 2246 KB |
| Title: | Electric Dyadic Green's Functions for Modeling Resonance and Coupling Effects in Waveguide-Based Aperture-Coupled Patch Arrays |
| Abstract: | An efficient technique for the rapid development of electric Green's dyadics of a transversely layered, terminated rectangular waveguide is presented with application to waveguide-based aperture-coupled patch arrays. This technique uses a partial eigenfunction expansion resulting in a Sturm-Liouville problem for one-dimensional characteristic Green's functions in the waveguiding direction. In this representation, the one-dimensional characteristic Green's functions provide physical insight into resonance and surface wave effects occurring in overmoded layered waveguide transitions. Particularly, this is related to the correlation between transverse resonances in the waveguide cross-section and surface waves associated with a grounded dielectric slab waveguide. This is demonstrated for the examples of aperture-coupled patch arrays in the N-port waveguide transition, although the analysis is applicable to other waveguide-based antenna structures, which allow for the propagation of surface waves. |
| Author(s): | Alexander B. Yakovlev, Sean Ortiz, Mete Ozkar, Amir Mortazawi, Michael B. Steer, Alexander B. Yakovlev, Sean Ortiz, Mete Ozkar, Amir Mortazawi, Michael B. Steer |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 2 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 234 KB |
| Title: | A Comparative Study of NN and SVM-Based Electromagnetic Inverse Scattering Approaches to On-Line Detection of Buried Objects |
| Abstract: | Microwave-based sensing techniques constitute an important tool for the detection of buried targets. In this framework, a key issue is represented by real-time scatterer localization. As far as such a topic is concerned, this paper presents a comparative evaluation of the performances provided by a conventional NN-based inverse scattering technique and by a new SVM-based electromagnetic approach. In order to estimate the effectiveness values of the two methods, realistic configurations and noisy enviornments are considered and current capabilities, as well as potential limitations, are pointed out. Finally, possible future research work is outlined. |
| Author(s): | Salvatore Caorsi, Davide Anguita, Emanuela Bermani, Andrea Boni, Massimo Donelli, Salvatore Caorsi, Davide Anguita, Emanuela Bermani, Andrea Boni, Massimo Donelli |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 2 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 319 KB |
| Title: | Accelerating Computations with a MoM-Based Computer Program |
| Abstract: | Electromagnetic research often requires studies within wider frequency ranges. For achieving a fine resolution in the frequency domain, the required computation time is usually high. Here the MoM-based field computation program FEKO working in frequency domain is used for this purpose. In order to reduce the computational costs by minimizing the number of sampling points used, the interpolation algorithm MPBE (Model Based Parameter Estimation) is applied to achieve a mathematically based approximation of the problem. This paper presents the acceleration of computations with FEKO using the interpolation algorithm MBPE. A short introduction to FEKO is given at the beginning. Subsequently the implementation of MBPE as well as three possible adaptive strategies for further shortening the computation time is presented. Finally examples are given that show the advantages of this implemented method. |
| Author(s): | M. Schick, F. M. Landstorfer, M. Schick, F. M. Landstorfer |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 878 KB |
| Title: | Computation of SAR in Cell Culture Flasks Exposed to 900 MHz GSM Type Signals in a Modified TEM Cell |
| Abstract: | In order to provide rigorous dosimetry for in vitro studies, Telstra Research Laboratories has developed a modified transverse electromagnetic cell exposure system. The system acts as a chamber for experiments in which a human cell culture exists as a very thin monolayer adhered to the bottom of a plastic culture flask under a layer of several millimetres of RPMI nutrient medium while incubated in a controlled atmosphere. A key to the rigour of any experiment seeking to investigate possible effects of electromagnetic energy on living systems is to ensure that the exposures used are accurately known, and to achieve this, numerical methods for the challenging task of characterising the SAR profile in the medium have been developed. This paper describes salient aspects of the development and analysis of the system. |
| Author(s): | R. L. McIntosh, R. J. McKenzie, S. Iskra, A. Carratelli, P. Standaert, R. L. McIntosh, R. J. McKenzie, S. Iskra, A. Carratelli, P. Standaert |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 238 KB |
| Title: | High Accuracy Calculation of the Magnetic Vector Potential on Surfaces |
| Abstract: | |
| Author(s): | Malcolm M. Bibby, Andrew F. Peterson, Malcolm M. Bibby, Andrew F. Peterson |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 1 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 395 KB |
| Title: | Numerical Study of Coupling between Coagulators and Electrodes of Cardiac Pacemakers under Consideration of the Human Body |
| Abstract: | The paper presents a numerical, worst-case study of the coupling between coagulators and cardiac pacemakers under consideration of the human body. For this purpose two special body models have been implemented. With these models whose electrical properties correspond to a weighted average of those of different tissues of the human body the influence of the latter can be taken into account in the computations. Different parameters such as position of the pacemaker and its electrode, coagulation frequency, and coagulation point on the surface of the human body are considered. Based on results of previous investigations simplified approaches to account for the dielectric coating of the coagulator electrode and housing of the pacemaker can be used. The investigation shows, that for the scenario described above, strong peaks occur in the resulting graphs arising form resonance effects on the coagulator cable. |
| Author(s): | Markus Schick, Friedrich M. Landstorfer, Markus Schick, Friedrich M. Landstorfer |
| File Type: | Journal Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 6529 KB |
| Title: | MODELISATION OF PROBE FEED EXCITATION USING ITERATIVE METHOD |
| Abstract: | This paper presents an implementation of an iterative method based on the waves concept for analyzing patch antennas fed by coaxial probes. This method includes a two-dimensional fast Fourier transform (FFT-2D) in a wave guide environment. The method has the advantage of simplicity in that it does not involve basis functions and inversion of matrices, as used in other calculation methods. Therefore, it is capable of analyzing larger bodies than other classical techniques. An implementation of the iterative calculation is shown for the extraction of S parameters of microwave components and antennas. The good agreement between simulation results and experimental published data justifies the design procedure and validates the present analysis approach. |
| Author(s): | H. Zairi, A. Gharsallah, A. Gharbi, H. Baudrand, H. Zairi, A. Gharsallah, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 19 Number: 3 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 416 KB |
| Title: | FDTD Analysis of a Probe-Fed Dielectric Resonator Antenna in Rectangular Waveguide |
| Abstract: | Dielectric resonator antennas (DRA) are characterized for operation in a guided-wave environment with the ultimate goal of their use in modeling of waveguide-based DRA amplifier arrays for spatial power combining. Performance of a single probe-fed DRA element in rectangular waveguide is analyzed by varying design parameters of the DRA and the feeding probe to optimize the structure for the scattering characteristics (port matching and coupling). The effect of hard walls on the DRA behavior is also studied. The numerical analysis of waveguide-based DRA elements is based on the Finite-Difference Time-Domain (FDTD) method and a coaxial probe is modeled by a thin wire approximation implemented in the FDTD algorithm. The numerical results are compared with those generated by using commercial software and exhibit a very good agreement. |
| Author(s): | Yizhe Zhang, Ahmed A. Kishk, Alexander B. Yakovlev, Allen W. Glisson, Yizhe Zhang, Ahmed A. Kishk, Alexander B. Yakovlev, Allen W. Glisson |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 1 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 347 KB |
| Title: | Comparison of WIPL-D to Other EM Computation Methods |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling Using WIPL-D Code(II) Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 214 KB |
| Title: | Surface Based Differential Forms |
| File Type: | Conference Paper |
| Issue: | Volume: Hybrid CEM Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 188 KB |
| Title: | Response Sensitivity Analysis with Frequency-Domain Full-Wave Electromagnetic Solvers |
| File Type: | Conference Paper |
| Issue: | Volume: Optimization and Solution of Complex EM problems Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 258 KB |
| Title: | Computer-Aided Design of Compact Dual Frequency Arrow Shaped Microstrip Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Computational Techniques for Antenna Design Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 187 KB |
| Title: | Improving the Numerical Efficiency of Generalized Multipole Technique by Non-redundant Multipole Choices |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Techniques Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 435 KB |
| Title: | Analyzing the Stability of the New FDTD Technique for Non-Dispersive Bi-Isotropic Media Using the von Neumann Method. |
| File Type: | Conference Paper |
| Issue: | Volume: Bianisotropic and Metamaterial Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 205 KB |
| Title: | New Ray-Tracing Techniques and Propagation Modeling for Challenging Communication Environments |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 549 KB |
| Title: | Application of an iterative method for the solution of electromagnetic scattering from wire antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 167 KB |
| Title: | Design and Optimisation of an Antenna Array for WIMAX Base Stations |
| File Type: | Conference Paper |
| Issue: | Volume: Beamforming and Smart Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 816 KB |
| Title: | Hard and Soft Surfaces Realized by Frequency Selective Surfaces on a Grounded Dielectric Slab |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Analysis of Wave Phenomena Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 207 KB |
| Title: | European effort towards a unified framework for the analysis of antenna structures |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Recent Electromagnetics & Antennas Activities in the European Network "ACE" Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 153 KB |
| Title: | The Channel Characterization and Performance Evaluation of Mobile Communication Employing Stratospheric Platform |
| File Type: | Conference Paper |
| Issue: | Volume: Propagation Channel Characterization Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 210 KB |
| Title: | Propagation Prediction Software for Wireless Communication System Optimization |
| File Type: | Conference Paper |
| Issue: | Volume: Propagation Channel Characterization Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 379 KB |
| Title: | Efficient Calculation of Field Distribution with High-Resolution Using Ray-Tracing Method |
| File Type: | Conference Paper |
| Issue: | Volume: Fast and Efficient CEM Methods Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 268 KB |
| Title: | Study of Electromagnetic Scattering From Material Object Doped Randomely WithThin Metallic Wires Using Finite Element Method |
| File Type: | Conference Paper |
| Issue: | Volume: Hybrid CEM Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 121 KB |
| Title: | Analysis of a Linear Slot Array Comprised of Tilted Edge Slots Cut in the Narrow Wall of a Rectangular Waveguide |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Communication Antenna Analysis and Design Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 160 KB |
| Title: | Narrow Beam Adaptive Array for Advanced Wireless Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Communication Antenna Analysis and Design Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 349 KB |
| Title: | The Influence of Data Density on the Consistency of Performance of the Feature Selective Validation (FSV) Technique |
| Abstract: | The human visual system has an immense capacity for compensating for poor or incomplete data. Psycho-visual coding schemes make use of the brain’s ability to extrapolate and interpolate independently of conscious awareness to reduce data (bit) rates but maintain the same level of ‘information’ within a video signal. However, when attempting to produce a simple method for comparing data-sets, primarily for validation of computational electromagnetics, could give rise to a problem. Namely that someone undertaking the visual inspection of (e.g.) modeled data against experimental data will see the same picture whether sampled at N, 100N or 0.01N data points whereas the software undertaking the comparison would process three very different data sets. The Feature Selective Validation (FSV) method was developed to attempt to mimic the group response of a number of experts undertaking the visual comparison. Hence, the quality of performance of the FSV method should not be severely affected by the number of data points if this assertion is to hold, despite the obvious potential for variation. This paper investigates the FSV performance as a function of data density and shows that the accuracy of its performance remains largely unimpeded by variations in the precision of the data supplied. |
| Author(s): | Alistair Duffy, Antonio Orlandi, Alistair Duffy, Antonio Orlandi |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 2 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 294 KB |
| Title: | Polarization Isolation Characteristics Between Two Center-Feed Single-Layer Waveguide Arrays Arranged Side-by-Side |
| Abstract: | Abstract - The near field coupling between two large alternating-phase fed single-layer waveguide arrays arranged side-by-side is analyzed by the Finite Element Method (FEM) (HFSS). First, the overall reflection as well as the radiation pattern from the array (320 slots and 18.4 λ x 14.9 λ) is analyzed, and excellent agreement with measurements is observed. Next, the isolation between two arrays is computed, and remarkable polarization isolations of more than 80 dB are predicted. The isolation is verified by measurements. The influence of the relative arrangement of the arrays upon the isolation is discussed. |
| Author(s): | Yasuhiro Tsunemitsu, Jiro Hirokawa, Makoto Ando, Yohei Miura, Yasuhiro Kazama, Naohisa Goto, Yasuhiro Tsunemitsu, Jiro Hirokawa, Makoto Ando, Yohei Miura, Yasuhiro Kazama, Naohisa Goto |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 3 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 1538 KB |
| Title: | Genetic Algorithm Optimization of a Traveling Wave Array of Longitudinal Slots in a Rectangular Waveguide |
| Abstract: | Abstract — Genetic Algorithm is used to optimize the performance characteristics of a traveling wave array consisting of longitudinal slots cut in the broad wall of a rectangular waveguide. An analysis method employing a loaded transmission line to model the slot arrays is employed. External mutual coupling is considered. The self admittance of the radiating slots is computed using the method-of-moments technique applied to the pertinent integral equations. Numerical results indicate typical performance improvements possible using the genetic algorithm optimization. |
| Author(s): | Anders Jensen, Sembiam R. Rengarajan, Anders Jensen, Sembiam R. Rengarajan |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 3 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 496 KB |
| Title: | Cascading Optical Negative Index Metamaterials |
| Abstract: | We use a spatial harmonic analysis (SHA) method to homogenize optical metamaterials with a negative refractive index; the method provides a more general approach than other methods for estimating the effective index of materials arranged of cascaded elementary layers. The approach is validated for a single layer and a triple layer two dimensional metal grating. |
| Author(s): | Alexander V. Kildishev, Uday K. Chettiar, Alexander V. Kildishev, Uday K. Chettiar |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 1 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 395 KB |
| Title: | Characterizing Infrared Frequency Selective Surfaces on Dispersive Media |
| Abstract: | With the emergence of frequency selective surfaces (FSS) and other passive planar antenna devices at infrared frequencies, the increasing need for accurate characterization using numerical modeling prior to device fabrication has exposed limitations in the traditional modeling procedures used for lower frequency FSS designs. To improve full-wave FSS models at IR, a procedure to measure and integrate dispersive material properties in modeling is described. Measured and modeled results are provided as verification demonstrating the need to account for material dispersion in infrared FSS design. |
| Author(s): | James Ginn, Brian Lail, David Shelton, Jeffrey Tharp, William Folks and Glenn Boreman, James Ginn, Brian Lail, David Shelton, Jeffrey Tharp, William Folks and Glenn Boreman |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 1 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 509 KB |
| Title: | Investigation of Wire Grid Modeling in NEC Applied to Determine Resonant Cavity Quality Factors |
| Abstract: | Numerical computer simulations using the NEC Method of Moments (MoM) code were performed on wire grid models of resonant cavities in order to study how well conductive structures and their surface impedances can be modeled by wire meshes. The resonant cavity quality factor, or Q, was examined due to its high sensitivity to surface impedance. Several half-wave coaxial cavities were simulated using various mesh element sizes. The cavities’ outer conductor radius was varied to obtain different geometries. The quality factor Q was determined from the simulated input impedance spectra. The wire grid model results were compared to well known theoretical and experiment results. Qualitative agreement between simulation, theoretical, and experimental results was achieved for fixed mesh parameters, giving confidence in comparative simulation using the same wire grid meshing parameters. Quantitative agreement of simulation results was achieved through repeated simulation with varying mesh element lengths and extrapolating the simulation results to a conceptual mesh element length of zero. This shows that simulations to determine quantities sensitive to surface impedances can be successfully performed with codes such as NEC. |
| Author(s): | Franz A. Pertl, Andrew D. Lowery, James E. Smith, Franz A. Pertl, Andrew D. Lowery, James E. Smith |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 3 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 297 KB |
| Title: | A Review of Statistical Methods for Comparing Two Data Sets |
| Abstract: | Statistical approaches to compare data for validation of computational electromagnetics have been used for several years. They provide an accepted means of obtaining a numerical value to quantify the data under consideration. However, the use and meaning of these ‘numbers’ depends, by necessity, on the application. This paper provides an overview of some of the most widely applicable techniques, relating the output of these to visual assessment. It further includes comparison with the FSV (Feature Selective Validation) method allowing a triangulation between statistical approaches, visual approaches and heuristic approaches to validation. It is important that the decision to use or reject a particular technique for validation is based on a rational and objective selection approach. This paper suggests a framework to support this selection approach. |
| Author(s): | A. Duffy, A. Orlandi, A. Duffy, A. Orlandi |
| File Type: | Journal Paper |
| Issue: | Volume: 23 Number: 1 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 165 KB |
| Title: | Analysis and Design of a Planar Multilayered FSS with Arbitrary Incidence |
| File Type: | Journal Paper |
| Issue: | Volume: 23 Number: 2 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 209 KB |
| Title: | Characterization of Meta-Materials Using Computational Electromagnetic Methods |
| File Type: | Conference Paper |
| Issue: | Volume: Metamaterials Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 241 KB |
| Title: | Numerical Modeling Interaction of RF Field in MRI with a Pregnant Female Model |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Imaging Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 138 KB |
| Title: | Lightning Electromagnetic Fields Computation using Time Domain Finite Element Method |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Time Domain Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 68 KB |
| Title: | A Multiresolution Model of Transient Microwave Signals in Dispersive Chiral Media |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Time Domain Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 214 KB |
| Title: | Low-cost Nonplanar Microstrip-line Ferrite Phase Shifter Utilizing Circular Polarization |
| File Type: | Conference Paper |
| Issue: | Volume: Phased Array and Active Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 217 KB |
| Title: | Slot Antenna for Ultra Wideband System |
| File Type: | Conference Paper |
| Issue: | Volume: Wideband Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 257 KB |
| Title: | Comparative Study of Wideband Properties of Planar Solid and Strip Fractal Bow-Tie Dipoles |
| File Type: | Conference Paper |
| Issue: | Volume: Wideband Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 775 KB |
| Title: | High Performance Low Cost Ferroelectric Phase Shifters Designed for Simple Biasing |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Electromagnetic Modeling by WIPL-D Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 211 KB |
| Title: | Numerical Simulation of the Generation of Synchrotron Radiation in a Vacuum Chamber with FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis - 2 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 257 KB |
| Title: | Self-Adjoint Sensitivity Analysis of High-Frequency Structures with FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis - 2 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Fast Hybrid CAD Technique for the Optimization of Advanced Waveguide Components and Aperture Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Hybrid Techniques Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 1500 KB |
| Title: | Self-Adjoint Sensitivity Analysis of High-Frequency Structures with FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Session- Students Paper Competition Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Modeling Localized Surface Plasmons in Light Tunneling and New Optical Sensing Approach |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Electromagnetics for Photonics Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 208 KB |
| Title: | Low-frequency analysis of electromagnetic interference from SMPS |
| File Type: | Conference Paper |
| Issue: | Volume: Innovation in the Macromodeling of High Speed Interconnects Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 206 KB |
| Title: | Optimization of a High-Speed Interconnect Link Under Signal Integrity Constraints |
| File Type: | Conference Paper |
| Issue: | Volume: Innovation in the Macromodeling of High Speed Interconnects Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 500 KB |
| Title: | Parallelized Integral Equation Methods for Signal Integrity |
| File Type: | Conference Paper |
| Issue: | Volume: Macromodeling for EMC and SI Complex Systems Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 101 KB |
| Title: | Analysis of Photonic Band Gap using Multilayer Contribution of Wave Concept Iterative Process MLC-WCIP |
| Abstract: | Microstrip elements are modeled in multilayered contribution. An iterative method based on the concept of waves is developed in a form useful for efficient computation for interacting microstrip elements, which may be located at any substrate layer and separated by a large distance. The multilayer contribution of iterative method is developed in the spatial domain. Examples for regularly shaped geometries in multilayered media are presented. These involve the optimization of a microstrip ring with a narrow gap which induces multiple reflections with a fixed phase correlation necessary to make the photonic band gap. The analysis takes into account eventual coupling parasites. Experimental measurements are performed to validate the computation. The approach involves the mixed magnetic and electric field equation technique and the wave concept iterative process which involves S-parameters extraction technique. In this sense, a program in FORTRAN has been elaborated to determine different parameters Sij characterizing the studied structure. A good agreement between numerical and reported results is important to validate the theory of the multilayer contribution of iterative method MLC-WCIP. |
| Author(s): | E. A. Hajlaoui, H. Trabelsi, A. Gharsallah, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 3 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 281 KB |
| Title: | A Mode Selecting Eigensolver for 2D FIT Models of Waveguides |
| Abstract: | For the computation of eigenmodes in multimodal waveguide structures, the Jacobi- Davidson eigenvalue solver is extended by a vector-based weighting function. It allows to generate only modes with a desired field distribution. The performance of this solver is studied by means of an eigenmode computation in a photonic crystal fiber which is discretized by the finite integration technique. The new algorithm is able to separate the modes in the fiber core from a number of non-physical modes which originate from a transversal PML-type boundary condition. |
| Author(s): | B. Bandlow, R. Schuhmann |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 6 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 461 KB |
| Title: | Application of the Normalized Surface Magnetic Source Model to a Blind Unexploded Ordnance Discrimination Test |
| Abstract: | The Normalized Surface Magnetic Source (NSMS) model is applied to unexploded ordnance (UXO) discrimination data collected at Camp Sibert, AL, with the EM63 electromagnetic induction sensor. The NSMS is a fast and accurate numerical forward model that represents an object’s response using a set of equivalent magnetic dipoles distributed on a surrounding closed surface. As part of the discrimination process one must also determine the location and orientation of each buried target. This is achieved using a physics-based technique that assumes a target to be a dipole and extracts the location from the measured magnetic field vector and the scalar magnetic potential; the latter is reconstructed from field measurements by means of an auxiliary layer of magnetic charges. Once the object’s location is estimated, the measured magnetic field is matched to NSMS predictions to determine the timedependent amplitudes of the surface magnetic sources, which in turn can be used to generate classifying features. This paper shows the superior discrimination performance of the NSMS model. |
| Author(s): | F. Shubitidze, J. P. Fernandez, I. Shamatava, L. R. Pasion, B. E. Barrowes, K. O'Neill |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 1 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 907 KB |
| Title: | New Antennas Based on Triangular Patch as a Solution for RFID Application |
| Abstract: | This paper covers the design of a new antenna for RFID applications at microwave frequencies. Five antennas are studied. The first three structures are inspired from a triangular patch, whereas the fourth and the fifth are inspired from a Sierpenski fractal antenna. The size reduction is more than 80%, which explains the utility of the proposed antennas. |
| Author(s): | A. Ferchichi, N. Sboui, A. Gharsallah, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 3 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 477 KB |
| Title: | RFID-Based System for Pilgrims Identification and Tracking |
| Abstract: | This paper describes a prototype of a system developed using a passive RFID wristband tag for identification of pilgrims in the holy areas during Hajj. Upon presentation of the tag to a handheld reader all information related to the pilgrim holding the tag will be displayed on the screen of the reader. This way if a pilgrim gets sick, lost, or dies he can be easily identified through the tag on the spot. Officers around the holy area will have a light-weight handheld reader that can get all information from the tag without the need to burden the already overloaded communication network during the Hajj season. The developed prototype was tested on 1000 pilgrims from the country of Ivory Coast in collaboration with officials from Hajj Ministry and Development Commission of the Holy cities of Makkah and Madinah. The results of the experiment have convinced Hajj authorities to utilize this technology for all pilgrims in the future. Additionally, we have explored the possibility of tracking pilgrims using active RFID system. Due to the small number of working tags, experiment was performed only on 6 persons. Results of the latter experiment have shown that the system requires further development and needs to be validated with a larger number of tags. |
| Author(s): | M. Mohandes |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 3 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 900 KB |
| Title: | A New Software and Hardware Parallelized Floating Random-Walk Algorithm for the Modified Helmholtz Equation Subject to Neumann and Mixed Boundary Conditions |
| Abstract: | A new floating random-walk algorithm for the one-dimensional modified Helmholtz equation subject to Neumann and mixed boundary conditions problems is developed in this paper. Traditional floating random-walk algorithms for Neumann and mixed boundary condition problems have involved “reflecting boundaries” resulting in relatively large computational times. In a recent paper, we proposed the elimination of the use of reflecting boundaries through the use of novel Green’s functions that mimic the boundary conditions of the problem of interest. The methodology was validated by a solution of the one-dimensional Laplace’s equation. In this paper, we extend the methodology to the floating random-walk solution of the onedimensional modified Helmholtz equation, and excellent agreement has been obtained between an analytical solution and floating random-walk results. The algorithm has been parallelized and a near linear rate of parallelization has been obtained with as many as thirty-two processors. These results have previously been published in [1]. In addition, a GPU implementation employing 4096 simultaneous threads displayed a similar near-linear parallelization gain and a one to two orders of magnitude improvement over the CPU implementation. An immediate application of this research is in the numerical solution of the electromagnetic diffusion equation in magnetically permeable and electrically conducting objects with applications in dielectrometry and magnetometry sensors that have the ability to detect sub-surface objects such as landmines. The ultimate goal of this research is the application of this methodology to the solution of aerodynamical flow problems. |
| Author(s): | K. Chatterjee, M. Sandora, C. Mitchell, D. Stefan, D. Nummey, J. Poggie |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 4 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 229 KB |
| Title: | Iterative Solution of Electromagnetic Scattering by Arbitrary Shaped Cylinders |
| Abstract: | The electromagnetic scattering analysis of geometrically complex structure has played an important role in electromagnetic field theory and practicable applications. The fast and rigorous methods to solve such problem are in great demand. In this work, the Wave Concept Iterative Process (WCIP) combined with a coordinate transformation has been extended to the scattering problems of electromagnetic conducting square cylinder, conducting super-ellipsoid and conducting super-ellipsoid coated with thin dielectric materials. Numerical results illustrate the efficiency of our approach. The radar cross section (RCS) is then reached and compared with the literature. |
| Author(s): | J. Selmi, R. Bedira, A. Gharsallah, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 7 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 470 KB |
| Title: | Analysis of Dual-Mode Microstrip Patch Filter using Multiscale Wave Concept Iterative Process |
| Abstract: | An iterative method based on the multiscale approach named multiscale wave concept iterative process (MWCIP) is introduced in this paper. This new approach is an extension of the known wave concept iterative process (WCIP). The specificity of the MWCIP method is the nonuniform meshing with macropixels used to improve the time delay computations of the classical iterative procedure. The method is applied successfully to a nondegenerate dual-mode microstrip patch filter. Comparison between the new and classical iterative methods shows that with the presented approach the CPU time and memory requirement have been considerably reduced. |
| Author(s): | T. I. E. Brahim, H. Zairi, A. Gharsallah, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 9 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 488 KB |
| Title: | Analysis of Circular Slots Leaky-Wave Antenna in Cylindrical Waveguide by Wave Concept Iterative Procedure |
| Abstract: | This paper presents the analysis of circular slots leaky-wave antenna by using an iterative method based on the wave concept. The classic method has been reformulated in cylindrical coordinates in order to be adequate for the analysis of the leaky-wave antenna with fast convergence. The proposed leaky-wave antenna can be used to replace a micro-strip patch array. Numerical results are presented to illustrate the advantages of the proposed structure. A good agreement between the new wave concept iterative procedure (WCIP) method results and published data is obtained. |
| Author(s): | Z. Houaneb, H. Zairi, A. Gharsallah, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 10 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 569 KB |
| Title: | Fast Design Optimization of Microwave Structures Using Co-Simulation-Based Tuning Space Mapping |
| Abstract: | Tuning space mapping (TSM) expedites efficient design optimization of microwave circuits by replacing sections in the electromagnetic (EM) model with corresponding sections of designable equivalent elements. A key assumption of TSM is that these designable elements can replace their respective EM model sections without introducing significant distortion in the structure’s response. This can be achieved through the co-calibrated ports technique introduced in Sonnet em. Here, we generalize the TSM algorithm. A tuning model is constructed by simulating the EM model sections separately and connecting them with the tuning components through a co-simulation process. This allows us to implement the TSM algorithm with any EM simulator. The response misalignment between the original structure and the tuning model is reduced using classical space mapping. The proposed algorithm is illustrated through the design of two microstrip filters simulated in FEKO. |
| Author(s): | S. Koziel, J. W. Bandler |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 8 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 704 KB |
| Title: | Improving the Convergence of the Wave Iterative Method by Filtering Techniques |
| Abstract: | Among the numerical methods used in the electromagnetic modeling of high frequency electronic circuits, we include the wave concept iterative method. In this paper, we propose to improve the convergence speed of this method when modeling a complex structure. This method requires a maximum number of iterations, noted “Nmax”, to achieve the convergence to the optimal value. Our goal is to reduce the number of iterations calculated by this method to the value “Nmin” in order to reduce the computing time and to improve the convergence speed. This is done by adding a new algorithm based on filtering techniques. |
| Author(s): | H. Hrizi, L. Latrach, N. Sboui, A. Gharsallah, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 10 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 226 KB |
| Title: | Surface Integral Equation Solvers for Large-Scale Conductors, Metamaterials and Plasmonic Nanostructures |
| Abstract: | Surface integral equation (SIE) approaches for the accurate solution of different problems in computational electromagnetics are addressed. First, an efficient message passing interface (MPI)/OpenMP parallel implementation of the multilevel fast multipole algorithm-fast Fourier transform (MLFMA-FFT) is presented for the solution of large-scale conducting bodies. By combining the high scalability of the fast multipole method-FFT (FMM-FFT) with the high efficiency of MLFMA, challenging problems up to one billion unknowns are solved using a parallel supercomputer. Second, looking for the extension of these rigorous approaches to new demanded areas, the SIE method is successfully applied to the solution of left-handed metamaterials and plasmonic nanostructures. Numerical examples are presented to confirm the validity and versatility of this approach for the accurate resolution of problems in the context of leading-edge nanoscience and nanotechnology applications. |
| Author(s): | J. M. Taboada, M. G. Araújo, J. Rivero, L. Landesa, F. Obelleiro |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 2 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 961 KB |
| Title: | Efficient Analysis of Switchable FSS Structure using the WCIP Method |
| Abstract: | A precise technique based on the wave concept iterative procedure (WCIP) and a fast mode transformation (FMT) is used to adjust the frequency selective surface (FSS) response. This adjustment is achieved by integrating RF-MEMS switches. These systems use the manufacturing processes of integrated circuits. In order to initialize the iterative procedure, an incident wave is defined in spectral domain. The numerical results are compared to those obtained with the finite element method (FEM). The good agreement between simulated and published data justifies the design procedure. |
| Author(s): | N. Sboui, A. Salouha, L. Latrach, A. Gharsallah, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 751 KB |
| Title: | An Adaptive Time-Stepping Algorithm in Weakly Coupled Electro-Thermal 2D-FE Modeling |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 345 KB |
| Title: | HPC for Legacy EM Code, a Mixed Language Approach using CUDA |
| File Type: | Conference Paper |
| Issue: | Volume: GPU for CEM Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 144 KB |
| Title: | Supercomputing solution of large electromagnetic problems with parallel MLFMA-FFT |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Numerical Techniques for Multiscale EM Wave Problems Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 391 KB |
| Title: | Fast Surface Integral-Equation Solutions of Metamaterial and Plasmonic Problems |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Integral Equation Methods Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 632 KB |
| Title: | Analysis and Discretization of the Yukawa-Calderon Preconditioned CFIE |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Integral Equation Methods Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 347 KB |
| Title: | An Adaptive Time-Stepping Algorithm in Weakly Coupled Electro-Thermal 2D-FE Modeling |
| File Type: | Conference Paper |
| Issue: | Volume: Multi-Physics Modeling and Simulations Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 345 KB |
| Title: | Physical Modeling of a Parasitic Net Area Check (NAC) Tie-Down Diode for De-embedding |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications in Sonnet Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 673 KB |
| Title: | E-Shaped High Gain Microstrip Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 169 KB |
| Title: | Mortar Element Method for the Integral Equation Based Modeling of Scattering by Perfect Electrical Conductors |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Integral Equation Methods Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 537 KB |
| Title: | A 60GHz Aperture-Coupled Micromachined Microstrip Antenna for Heterogeneous 3D Integration (System-In-Package) |
| File Type: | Conference Paper |
| Issue: | Volume: System-on-Package (SoP) Wireless Components Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 298 KB |
| Title: | Tuning Space Mapping for Microwave Design Optimization |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulations using Sonnet Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 336 KB |
| Title: | The Method of Auxiliary Sources for Solving Low-Frequency Electromagnetic Induction Problems in Underwater Environments |
| File Type: | Conference Paper |
| Issue: | Volume: New Electromagnetic Techniques and Measurements Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 1302 KB |
| Title: | Low-Frequency Response of a Sphere Embedded in Water |
| File Type: | Conference Paper |
| Issue: | Volume: Numerical Techniques for Electromagnetic Applications Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 263 KB |
| Title: | Extraction of the Complex Permittivity of Dispersive Materials with a Stochastic Optimization Technique |
| File Type: | Conference Paper |
| Issue: | Volume: Nondestructive Evaluation and Materials Characterization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 81 KB |
| Title: | Co-Simulation Based Tuning Space Mapping with FEKO for Computationally Efficient Optimization of Microwave Structures |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using FEKO Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 245 KB |
| Title: | A Parallelized Quasi-Monte Carlo Algorithm for The Extraction of Partial Inductances in IC Interconnect Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Advances in Integral Equations and Fast Methods Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 196 KB |
| Title: | Spectral Properties and Regularization of Loop, Star, and Tree Related Gram Matrices |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Advances in Integral Equations and Fast Methods Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 940 KB |
| Title: | Physical bounds on the partial realized gain |
| File Type: | Conference Paper |
| Issue: | Volume: Small Antennas - I Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 182 KB |
| Title: | Accurate Modeling of Microwave Devices Using Space Mapping and Kriging |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Simulation-Based Modeling and Design Optimization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 286 KB |
| Title: | Secure RFID Communications |
| File Type: | Conference Paper |
| Issue: | Volume: RFIday 2010 Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 207 KB |
| Title: | Ultra-Wideband Offset Bicone/Dipole Antenna: Simulations and Measurements |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 379 KB |
| Title: | A Framework for Optimization and Statistical Analysis of On-chip Passive Devices |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Electromagnetic Methods of Significantly Reduced Complexity for High-Speed IC Design Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 380 KB |
| Title: | Microwave Design Optimization Using Implicit Space Mapping with Adaptive Selection of Preassigned Parameters |
| File Type: | Conference Paper |
| Issue: | Volume: Optimization Methods for Electromagnetics Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 118 KB |
| Title: | Automated Tuning Space Mapping Implementation for Rapid Design Optimization of Microwave Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave Modeling and CAD Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 131 KB |
| Title: | Appropriate Choice of Trial Functions for Efficient Modeling of Asymmetric Coplanar Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave Modeling and CAD Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 465 KB |
| Title: | A New Parallelized Floating Random-Walk Algorithm for the Modified Helmholtz Equation Subject to Neumann and Mixed Boundary Conditions: Validation with a 1D Benchmark Problem |
| File Type: | Conference Paper |
| Issue: | Volume: Parallelized Computing for Accelerated EM Applications Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 198 KB |
| Title: | A mode selecting eigensolver for 2D FIT models of waveguides |
| File Type: | Conference Paper |
| Issue: | Volume: Fast and Efficient Methods for Transmission Lines and Waveguides Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 181 KB |
| Title: | Left-Handed Media as a Tool to Determine Scatterer Location |
| File Type: | Conference Paper |
| Issue: | Volume: Wave Propagation in Metamaterials and Nanostructures Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 93 KB |
| Title: | 25 Years of Progress and Future Challenges in Boundary-Element Based Field-Circuit and Multiphysics Solvers |
| File Type: | Conference Paper |
| Issue: | Volume: 25 Years of Progress and Future Challenges in Applied Computational Electromagnetics II Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 629 KB |
| Title: | Normalized Surface Magnetic Source Model Applied to Camp Sibert Data Sets: Discrimination Studies |
| File Type: | Conference Paper |
| Issue: | Volume: Low-Frequency Computational Electromagnetics Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 239 KB |
| Title: | Using the Feature Selective Validation Technique to Compare Data Sets |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Numerical EM and Propagation Tools Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 655 KB |
| Title: | Breast Skin Effect on Scattered Electromagnetic Fields |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 495 KB |
| Title: | An hp-Adaptive Discontinuous Galerkin Method in Time Domain Applied to the Simulation of Highly Localized Current Sources |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 127 KB |
| Title: | Breast Skin Effect on Scattered Electromagnetic Fields |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave Imaging and Inverse Problems Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 495 KB |
| Title: | Data-Derived Generalized SEA Applied to MPV TD Data |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave Imaging and Inverse Problems Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 148 KB |
| Title: | Investigation of Signal Integrity in On-Chip Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling and Small Antennas Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 1244 KB |
| Title: | An hp-Adaptive Discontinuous Galerkin Method in Time Domain Applied to the Simulation of Highly Localized Current Sources |
| File Type: | Conference Paper |
| Issue: | Volume: Finite-Volume and Discontinuous Galerkin Time-Domain Techniques Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 127 KB |
| Title: | Space Mapping Optimization of Microwave Structures with FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO – I Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 100 KB |
| Title: | Adaptive Mixed-Order FDTD Techniques on a Non-uniform Mesh |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Developments and Applications with Time-domain Modeling Techniques Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 257 KB |
| Title: | Coarse Models for Microwave Design Optimization with Space Mapping |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Optimization Methodologies for Engineering Design Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 147 KB |
| Title: | A Space Mapping Methodology for Defect Characterization |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Optimization Methodologies for Engineering Design Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 92 KB |
| Title: | Simulation of Frequency Agile RF MEMS Antennas Using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling by WIPL-D Software Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 483 KB |
| Title: | Statistical Analysis of Multi-Antenna Channel Capacity in the Urban Microcell Scenario |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Systems for Future Wireless Communications Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 119 KB |
| Title: | Capacity of an Antenna System in the Transmission Mode with Near-field Effects |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Systems for Future Wireless Communications Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 754 KB |
| Title: | Space Use Radial Line Slot Antenna with Honeycomb Structure |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 325 KB |
| Title: | A Statistical Toolkit For Validation |
| File Type: | Conference Paper |
| Issue: | Volume: New Techniques for Computational Electromagnetic Validation Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 106 KB |
| Title: | Ultra-Wideband Low Profile, U-Slot Microstrip Patch Antennas: L-Probe Feed Design Guidelines |
| Abstract: | The need for low-profile and ultra-wideband (UWB) antennas is rising in wireless communication and medical applications. The method of dimensional invariance, which is a class of U-slot patch design methods, is utilized to realize an initial, low-profile, wideband design. Building on this initial wideband design, this study establishes ideal L-probe feed dimensions through extensive parametric study on ?r = 2.2 and 4.5 substrates to propose empirical guidelines for the design of L-probe feeds which yield first-pass optimum impedance bandwidth. The established ideal L-probe dimensions, after further extrapolation, are used successfully on other substrates, ?r = 3.27, 6.0 and 9.2, for the design of first-pass L-probe feeds which yield impedance bandwidth over 55%, 60%, and 53%, respectively. The results of three commercially available EM simulation solvers show good agreement. |
| Author(s): | M. M. Elsewe, V. K. Dandu, D. Chatterjee |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 11 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2001 KB |
| Title: | Small-Size Tapered Slot Antenna (TSA) Design for use in 5G Phased Array Applications |
| Abstract: | The design and development of a compact tapered slot antenna (TSA) for the fifth generation (5G) phased array communications is described in this manuscript. The proposed low-profile TSA element is designed on a Rogers RT 5880 (?=2.2 and ?=0.0009) dielectric to work in the frequency range from 21 to 23 GHz. The configuration of the employed TSA antenna elements is composed of a slot-line flare from a small gap to a large opening, matching to free space’s wave impedance. Eight TSA elements with well-defined endfire radiation patterns have been used on the top portion of a mobile-phone PCB to form a 1×8 linear phased array. The TSA elements are fed by hockey-stick baluns. In addition, the radiation performance and SAR characteristics of the phased array 5G antenna in the vicinity of user’s hand & head have been investigated in this study. The results show that the proposed design provides good characteristics in terms of S-parameters, antenna gain, efficiency, SAR, and beam steering, which fit the need of 5G cellular communications. |
| Author(s): | N. O. Parchin, M. Shen, G. F. Pedersen |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 3 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2330 KB |
| Title: | Simulating Improved Antenna Performance using Measured Data of Electrically Thin Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: S17 Computational Electromagnetics, Advanced Algorithms and Emerging Applications/ High Performance Computing in Electromagnetics Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 501 KB |
| Title: | Printed UWB Pacman-Shaped Antenna with Two Frequency Rejection Bands |
| Abstract: | In this paper, the design and analysis of microstrip-fed low-profile, compact ultra-wideband (UWB) monopole antenna with two band-notches characteristics is carried out. The antenna is mounted on a low-cost FR-4 substrate with dimensions of 25×38×1.6 mm3, and relative permittivity of 4.4. The original shape of the patch is circular with radius of 11.5 mm, and then a sector is removed from the patch (making it a Pacmanshaped antenna) to improve the impedance bandwidth. The proposed antenna provides an impedance bandwidth between 2.9-15 GHz with better than 10 dB return loss and has nearly an omni-directional radiation pattern. Additionally, the antenna can reject the interference from WiMAX (3.5 GHz center frequency) and WLAN (5.5 GHz center frequency). |
| Author(s): | S. Naser, N. Dib |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 3 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1873 KB |
| Title: | Platform Tolerant and Conformal RFID Tag Antenna: Design, Construction and Measurements |
| Abstract: | This paper presents the design of a novel platform tolerant and conformal RFID (Radio Frequency Identification) tag antenna, which operates at the 902–928 MHz UHF band. The antenna has a simple, low-profile (1.8 mm thick) structure. It consists of two microstrip patches, which are separated by a narrow gap and driven by a microchip in the gap. The tag is designed to complex conjugate match an Alien- Higgs2 microchip. The performance of the tag is investigated on different surfaces (free space, human and metal) through simulations using parameters like power reflection coefficient, input impedance and radiation patterns. The effects of bending are investigated on the tag design. Experimental read-range, radiation pattern and impedance measurements are performed for the tag. High Frequency Structure Simulator (HFSS) simulation validation has been achieved due to excellent agreement with measurements for this particular application. The experimental measurements show that the maximum boresight average read range of the designed RFID tag on different platforms is about 3.5m (4 W EIRP). |
| Author(s): | H. Rajagopalan, Y. Rahmat-Samii |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 6 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 2626 KB |
| Title: | Passive Fractal Chipless RFID Tags Based on Cellular Automata for Security Applications |
| Abstract: | In this paper, we propose a novel design of low-profile fractal chipless tags with unique specific electromagnetic responses. The tags are designed using cellular automata (Game of Life) technique to ensure the randomness of the generated fractal tags. The tags are simulated in CST Microwave Studio for the frequency range of 2 to 10 GHz. The tags are realized on FR4 substrate and their radar cross-section (RCS) characteristics are analyzed for the nine different tags for the three different polarizations (horizontal, vertical, and oblique). Each tag shows a unique signature resonance response. The obtained results of coding capacity (16-20 bits), coding spatial capacity (1-1.25 bits/cm2), coding spectral capacity (2.15-2.9 bits/GHz), and coding density (0.15-0.18 bits/GHz x cm2) of realized tags are very good. The presented tags could be used for the development of secure RFID systems. |
| Author(s): | M. N. Zaqumi, J. Yousaf, M. Zarouan, M. A. Hussaini, H. Rmili |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 5 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1965 KB |
| Title: | Multi-Band Printed Meandered Loop Antennas for Wireless Routers with MIMO Implementation |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Design, in memory of Stan Kubina Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 1438 KB |
| Title: | Modeling and Validation of a Low-Profile Circularly Polarized Antenna Developed Using FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis IV Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 468 KB |
| Title: | Metamaterial-Based Low-Profile Broadband Hexagonal-Grid-Slotted Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 2-P2-E Antennas with Advanced/Artificial Materials and Processes Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 381 KB |
| Title: | Low-profile, Broadband Polarization Converting Surface Ground Planes for Antenna Polarization Diversity |
| File Type: | Conference Paper |
| Issue: | Volume: Novel Antennas Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 348 KB |
| Title: | Low-profile, Broadband Polarization Converting Surface Ground Planes for Antenna Polarization Diversity |
| Abstract: | A broadband antenna backed by a polarization converting surface ground plane is presented. The conversion of reflected field polarization provides diversity from a single, linearly polarized antenna, while avoiding broadside nulls in the radiation pattern as a function of frequency. Results for a low-profile dipole planar inverted cone antenna ~?/10 above a polarization converting surface indicate greater than 40% bandwidth. Comparison with solid ground planes and high impedance ground planes are discussed, with polarization diversity and lack of broadside nulls identified as key advantages to the proposed design. |
| Author(s): | B. A. Lail, K. Y. Han |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 1 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 543 KB |
| Title: | Low-profile Wideband Slot-loaded Dipole for Base Station Antenna Element |
| File Type: | Conference Paper |
| Issue: | Volume: 4-1-B Advanced Antenna Designs and RF Measurement Techniques Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 333 KB |
| Title: | Low-Profile Textile Antenna with Omni-Directional Radiation for Wearable Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S24 Applied EM for Biomedical and IoT Radar Technologies Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 604 KB |
| Title: | Low-profile Normal-Mode Helical Antenna for Use in Proximity to Metal |
| Abstract: | To expand the applicability of UHF tags, a low-profile, small, normal-mode helical antenna (NMHA) that can be used on metallic plates was developed. This paper clarifies the design method for antenna structures for use in proximity to metal. The design data were obtained with the electromagnetic simulator FEKO. Fundamental electrical characteristics such as the antenna input impedances, self-resonance conditions, and radiation characteristics were clarified in proximity to metal. For antenna sizes of 0.03–0.05 wavelengths, antenna gains of about –0.5 dBd were achieved. The calculated results were verified using an actual antenna (size, 0.04 wavelengths). A tap feed structure was used for impedance matching. It was shown that very precise design results could be achieved. Moreover, the developed NMHA was designed to be a tag antenna. Here, the antenna impedance was matched to the IC chip impedance. The read range of the developed tag was measured to be about 15 m. |
| Author(s): | W. Hong, N. Michishita, Y. Yamada |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 3 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 3524 KB |
| Title: | Low-profile Hybrid-mode Antenna Providing Near-hemispherical Field-of-view Coverage |
| Abstract: | The hybrid-mode model (HMM) combining monopole and dipole radiation modes can provide near-hemispherical coverage but has a high profile. To reduce the profile of HMM, a modified HMM is presented in this paper using a dipole radiator and a magnetic current loop radiator. Based on the modified model, a low-profile on-board antenna is proposed. When the side length of the ground is infinite, the 3-dB beamwidths in the xz plane and yz plane of the proposed antenna are both 180°. When the side length of the ground is finite, the proposed antenna can provide a near-hemispherical field-of- view coverage. The design example demonstrates the practicability of the modified HMM and the proposed antenna can be used in wide-angle scanning arrays and rich-multipath communication systems. |
| Author(s): | R. Wang, B.-Z. Wang, X. Ding, C. Hu |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 9 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1950 KB |
| Title: | Low-profile Dual-polarized Filtering Antenna with Improved Gain and Impedance Bandwidth using Characteristic Mode Analysis |
| Abstract: | A low-profile dual-polarized filtering microstrip patch antenna (MPA) with improved gain and bandwidth is realized without requirement of filtering circuit. Herein, the characteristic mode analysis (CMA) method is adopted to analyze the antenna performances. Initially, the resonant modes of the MPA are deeply analyzed, which indicates that its resonant frequencies of CM1 and CM3 could be moved close to each other by loading slots and shorting pins, thus broadening the impedance bandwidth. Then, the influence of the slots on radiation patterns of the antenna is further studied. The results demonstrate that the non-broadside radiation beam of its CM1 could be reshaped as the broadside beam, and the sidelobe level of its CM3 could be reduced by cutting the slots, leading to the improved gain. After that, the effect of the pins on the gain-response is investigated, It shows that the gain nulls of the MPA could be controlled at both lower and upper bands, especially for the non-filtering scheme. Finally, the proposed dual-polarized antenna is fabricated and tested. The results prove that its impedance bandwidth reaches to about 7.4% with a low-profile of about 0.038 free-space wavelength. Besides, a stable enhanced gain of around 10 dBi is achieved over the operating band. |
| Author(s): | Z.-Z. Wang, N.-W. Liu, L. Fang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 5996 KB |
| Title: | Low-Profile Dual-Band Emulated GPS Constellation Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S07 Novel Antennas for Upstream and Downstream Satellite Applications Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 256 KB |
| Title: | Low-profile Circularly Polarized Conformal Antenna Array with Side Lobe Suppression for Vehicular SATCOM Applications |
| Abstract: | A circularly polarized microstrip antenna array with low side lobe levels is proposed for Vehicular Satellite Communication. The suppression of side lobe levels is accomplished by the non-uniform power distribution utilized to feed the individual patch elements. Impedance matching is ensured by the incorporation of a quarter-wave transformer via a microstrip line fed to the edge of the patch. When the proposed amplitude-weighted feed is compared to the conventional corporate feed, simulation results indicate a reduction in side lobe levels of 8.9 dB. The proposed antenna is constructed out of RT/DUROID 5880 material, which is lighter, more flexible, and less expensive than ceramic materials. The radiation characteristics of the proposed antenna are compared when the antenna is planar versus when it is made to conform to the roof of the vehicle. The measured results indicate a reflection coefficient at the resonant frequency of -31.5 dB and -27.7 dB when conformal, an impedance bandwidth of 410 MHz and 180 MHz when conformal, an axial ratio bandwidth of 140 MHz and 170 MHz when conformal, and a peak gain of 15.719 dB and 14.335 dB when conformal. The measured results validate the simulation results that this proposed antenna is appropriate for a variety of Vehicular Satellite Communication applications. |
| Author(s): | E. Abishek, R. Subramaniam, P. Ramanujam, M. Esakkimuthu |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 6 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2183 KB |
| Title: | Low-Profile Broadband Top-Loaded Triangular Antenna with Folded Rim |
| Abstract: | This paper presents the impedance matching technique and the bandwidth characteristics of a low-profile top-loaded triangular antenna with oblique shorting pins. The folded rim is arranged at the edge of the finite ground plane. The bandwidth diagrams for various antenna heights, finite sizes of the ground plane, and the widths of the folded rim are obtained through the moment-method simulation. The maximum bandwidth of 43 % is achieved with 0.05 ? height. For the low-profile configuration, the bandwidth of 17 % is obtained with 0.03 ? height. |
| Author(s): | N. Michishita, W. J. Kim, Y. Yamada |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 2 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 991 KB |
| Title: | Low-Profile Asymmetrical-CSRR-Loaded Stacked Microstrip Patch Antenna |
| Abstract: | By introducing an asymmetrical-CSRRloaded parasitic patch beneath the radiating patch of a traditional low-profile microstrip antenna, a novel stacked antenna with both 22.46% fractional bandwidth, and stable and uniform radiation patterns in the entire operating frequency range is achieved, even the total height is only approximate 0.04?L (where ?L indicates the free-space wavelength corresponding to the lower bound of the operating frequency band). The antenna is designed, fabricated and tested. The experimental results agree with the simulations. |
| Author(s): | M.-C. Tang, T. Shi, H. Xiong, S. Qing |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 8 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1712 KB |
| Title: | Low Profile Magneto-Dielectric Ground Plane for Ultra-Wideband Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO - II Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 450 KB |
| Title: | Internal Network Boundary Condition Incorporated in FDTD to Efficiently Modeling Low-profile Periodic Structure |
| File Type: | Conference Paper |
| Issue: | Volume: 4-3-A Advances in FDTD Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 517 KB |
| Title: | In-Situ Simulation of Collision Avoidance Antenna in Vehicle-Mounted Environment |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis II Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 326 KB |
| Title: | Four-Element Planar MIMO Antenna for Indoor Communications with High Isolation |
| Abstract: | A low-profile monopole microstrip antennas with multiple-input-multiple-output (MIMO) configuration for a 4G/5G communication terminal is presented. The MIMO antenna system consists of four elements that operate in the LTE1800/2600 and GSM1800 bands. The antenna elements are mounted along the four sides of a rectangular ground plane of size 120×100 mm2. Spatial diversity technique and a modified ground plane are used to enhance isolation between elements. To mitigate the mutual coupling effect, the lower corners of the ground plane have been truncated. The measured isolation is lower than -17 dB between any two elements over the operating frequency bands. The total efficiency ranges from 69% to 83% and from 73% to 86% over LTE1800 and LTE2600 bands, respectively. The diversity performance of the measured envelope correlation coefficient (ECC) and radiation patterns meet the diversity criteria for 4/5G networks. |
| Author(s): | M. M. Morsy |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 12 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1489 KB |
| Title: | Flat-topped Beams using Phase Compensation based on Low-profile Transmitarray |
| Abstract: | This paper proposes a method to add an additional phase compensation to conventional phased arrays to achieve flat-topped beam forming, which can convert the spherical waves emitted by common conical horn antennas into cylindrical flat-topped beams, at the same time, there is also a certain power enhancement. A centrosymmetric unit composed of four layers of F4B and metal patches is designed. By changing the value of the parameters, a 360° phase change can be achieved, and it has the advantages of small size and low-profile. To validate the design concept, a prototype of the transmitarray (TA) was designed, fabricated, and measured by calculating the phase distribution of the front. The measurement results show that the designed TA can achieve flat-topped beams at 5.2GHz, the maximum gain is 1.15dB higher than that of the horn antenna, and the flat-topped range is about ±10°. The results are in good agreement with the simulation within the test range. |
| Author(s): | H. Zhang, T. Lan, S. Zhao, Q. He, Z. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 6 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 3389 KB |
| Title: | FEKO Simulation of Multi-Resonant Low-Profile PIFA |
| File Type: | Conference Paper |
| Issue: | Volume: S16 EM Modeling using FEKO Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 82 KB |
| Title: | FEKO Simulation of Multi-Resonant Low-Profile PIFA |
| Abstract: | A passive, low-profile multi-resonant planar-inverted-F antenna (PIFA) element well-suited for portable communications is presented. The antenna combines the optimal low-profile geometry of a planar inverted-F antenna with a double-tuned structure to create a multi-resonant element with monopole-class radiation properties. The form factor and overall dimensions are held constant for comparisons to a similar single-resonant antenna in different near-field environments. |
| Author(s): | C. W. Hearn, W. A. Davis |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 10 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 512 KB |
| Title: | FE-BI Analysis of a Leaky-Wave Antenna with Resistive Sheet Termination |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Electronically Reconfigurable WLAN Band-Notched MIMO Antenna for Ultra-wideband Applications |
| Abstract: | A low-profile electronically reconfigurable WLAN band-notched dual port multiple-input multipleoutput (MIMO) antenna design for ultra-wideband applications has been presented. Antenna elements exhibit good impedance match (S11 ≤ -10 dB) over entire ultrawideband (3.1 to 10.6 GHz) spectrum. The decoupling structure is used to improve isolation (S12/S21) above 20 dB over entire UWB band. Moreover, reconfigurable band-notching is achieved by inserting PIN diodes along the inverted L-shaped slots, in each radiator. Notch at WLAN (5.5 GHz) frequency band is achieved by switching the PIN diode to ‘OFF’ state. The antenna design is fabricated as well as measured, and the results suggests that the proposed design with switchable WLAN band-notch characteristics is suitable candidate for ultra-wideband applications. |
| Author(s): | A. Quddus, R. Saleem, S. Arain, S. R. Hassan, M. F. Shafique |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 8 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2079 KB |
| Title: | Development of Wideband Random Phased Arrays Composed of Modified Canted Sector Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Phased Array and Active Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 165 KB |
| Title: | Design of a Miniatured, Electromagnetic Quasi-Yagi Antenna with Circularly Polarized Characteristics |
| Abstract: | A novel low-profile circularly polarized (CP) quasi-Yagi antenna with a wide 3-dB axial ratio (AR) bandwidth is proposed, which generates the endfire beam by combining magnetic microstrip cavity and folded electric dipoles with a 90° phase difference. The proposed antenna includes two shorting pins, which are employed to attain wider impedance bandwidth. Then, a phase delay line is added to connects two pairs of folded dipoles and a magnetic microstrip cavity to realize righthanded circularly polarized (RHCP). After optimization, a prototype with an overall size of 1.17 × 0.91 × 0.0387λ03 is designed. Simulated results demonstrate that the final model has 18.1% (5.01-6.01 GHz) 3- dB AR bandwidth and –10 dB impedance bandwidth of 5.2% (5.67–5.97 GHz), respectively. In addition, experimental results demonstrate that the designed antenna is very applicable to the RFID system. |
| Author(s): | Y. Zhang, L. Liu, Z. Sun, X. Li, J. Che, H. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 3 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 5588 KB |
| Title: | Design of a Low-Profile Wideband Patch Antenna with L-Shaped Feeding Mechanism |
| File Type: | Conference Paper |
| Issue: | Volume: 9-P-2 Poster Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 210 KB |
| Title: | Design of a Low-Profile 2 to 6 GHz Circular Polarized Single Arm Hexagonal Spiral Array Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Antenna Design I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 715 KB |
| Title: | Compact, Low-Profile, Bandwidth-Enhanced Substrate Integrated Waveguide Filtenna |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-6 Low Profile and Wideband Antennas Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 110 KB |
| Title: | Calculation of Dual Leaky-wave Antenna Performance using Quad-core Processors and OpenMP |
| File Type: | Conference Paper |
| Issue: | Volume: Advancements in Finite-Element Analyses Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 200 KB |
| Title: | CADFEKO Curve Primitive Geometry Functions to Create a Reduced-Drag, Low-Profile Wideband Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 177 KB |
| Title: | Broadband and Low-profile Microstrip Antennas with Periodical Structures |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-6 Low Profile and Wideband Antennas Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 263 KB |
| Title: | Artificial Magnetic Conductors for Wideband Antenna Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Numerical Challenges in Modeling Metamaterials Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 281 KB |
| Title: | An Ultra-Wideband Absorber Backed Planar Slot Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S16 EM Modeling using FEKO Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 142 KB |
| Title: | An Ultra-Wideband Absorber Backed Planar Slot Antenna |
| Abstract: | Planar antenna designs have many advantages such as low-profile, light-weight, and ease of fabrication and integration. Here, a planar slot antenna implemented on ceramic substrate with coplanar waveguide feed is considered. With absorber loading the design provides 50 ? input impedance over the frequency range 0.3–3 GHz so it is considered ultra-wideband. This paper summarizes a numerical investigation using both frequency and timedomain solvers. The results serve to guide the future analysis of broadband antennas with lossy dielectric loading for ground penetrating radars. The evaluation of radar performance requires further simulation and model validation based on antenna measurements. |
| Author(s): | W. O. Coburn |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 407 KB |
| Title: | An Ultra-Wideband Absorber Backed Planar Slot Antenna |
| Abstract: | Planar antenna designs have many advantages such as low-profile, light-weight, and ease of fabrication and integration. Here, a planar slot antenna implemented on ceramic substrate with coplanar waveguide feed is considered. With absorber loading the design provides 50 omega input impedance over the frequency range 0.3–3 GHz so it is considered ultra-wideband. This paper summarizes a numerical investigation using both frequency and timedomain solvers. The results serve to guide the future analysis of broadband antennas with lossy dielectric loading for ground penetrating radars. The evaluation of radar performance requires further simulation and model validation based on antenna measurements. |
| Author(s): | W. O. Coburn |
| File Type: | Express Journal Paper |
| Issue: | Volume: 32 Number: 12 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1551 KB |
| Title: | An Ultra-Wideband Absorber Backed Planar Slot Antenna |
| Abstract: | Planar antenna designs have many advantages such as low-profile, light-weight, and ease of fabrication and integration. Here, a planar slot antenna implemented on ceramic substrate with coplanar waveguide feed is considered. With absorber loading the design provides 50 omega input impedance over the frequency range 0.3–3 GHz so it is considered ultra-wideband. This paper summarizes a numerical investigation using both frequency and timedomain solvers. The results serve to guide the future analysis of broadband antennas with lossy dielectric loading for ground penetrating radars. The evaluation of radar performance requires further simulation and model validation based on antenna measurements. |
| Author(s): | W. O. Coburn |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 12 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1551 KB |
| Title: | An Ultra-Wide Bandwidth Absorber Based on Tightly Coupled Array |
| File Type: | Conference Paper |
| Issue: | Volume: 1-P1-A Student Paper Contest Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 330 KB |
| Title: | An I-C Shaped Via-Patch Antenna with High Directivity and Wideband for RFID Tag Mounted on Metallic Surface |
| File Type: | Conference Paper |
| Issue: | Volume: S50 Antenna and Array Technologies for Modern Smart Radar Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 815 KB |
| Title: | A Wideband, High Gain and Low Sidelobe Array Antenna for Modern ETC Systems |
| Abstract: | Modern electronic toll collection (ETC) systems are currently moving towards a system design that is capable of fast and optimal payment handling for a single lane. Thus, the antenna of a roadside reader unit (RSU) needs to provide sufficient coverage over the vehicle lane during a payment cycle. In this paper, a left-hand circularly polarized (LHCP) 24 array antenna is proposed for European standard RSU readers at 5.8 GHz. The proposed array antenna consists of patch element antennas with parasitic elements to enhance gain and bandwidth. Sequential phase rotation feeding networks are applied to make the antenna low-profile. By using the optimized nut-shaped metasurface, the antenna can achieve higher gain due to concentrated radiation power in the boresight direction. The antenna has a wide impedance bandwidth of 2.34 GHz (37.73%), axis ratio bandwidth of 2.07 GHz (32.9%), high gain of 17 dBi, and sidelobe level (SLL) lower than -15 dB at 5.8 GHz. Especially, half-power beamwidths are 34° and 17° in horizontal and vertical planes, respectively, which covers sufficient space for a single lane while avoiding interference with other lanes. The performance of the proposed antenna is verified by measured results. It showed that the proposed antenna is a promising candidate for ETC applications. |
| Author(s): | L. T. Tran, C. D. Khuat, L. V. Phi |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 5 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 7299 KB |
| Title: | A Novel Symmetric Cascaded Frequency Selective Surface wtih Butterworth Response In X-Band |
| File Type: | Conference Paper |
| Issue: | Volume: 3-P3-E Perodic Structures Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 1226 KB |
| Title: | A Novel Method for the Low-detectable Dihedral Corner Utilizing Phase Gradient Metasurface based on Phase Cancellation Mechanism |
| Abstract: | In this paper, a phase gradient metasurface (PGM) is proposed to reduce the radar cross-section (RCS) of the dihedral corner based on phase cancellation mechanism. The phase cancellation mechanism is used to derive the formula of the low-detectable dihedral corner for the first time, which is directly used to deal with the wave path difference problem that introduced by the dihedral corner. According to the formula, six sub-cells are designed with a 60° phase difference, which is arranged by sub-array along the y-axis. The reflection coefficients of the selected sub-cells are all above 0.8. The RCS reduction of the dihedral corner achieves over 10 dB from 4.9 GHz to 5.14 GHz under an incident angle of 45°. In particular, the RCS reduction of the low-detectable dihedral corner is 13.97 dB at 5 GHz. Meanwhile, the proposed dihedral corner with PGM also has an excellent performance of angle insensitivity ranging from 0° to 75°. To further verify our design, the dihedral corner with PGM is manufactured by a low-cost printing circuit board technique. The measured results agreed well with the simulations, and both of them show an excellent performance of RCS reduction in the operating frequency band, regardless of any angle within 75°. Overall, the dihedral corner with PGM that we proposed has the advantages of being low-detectable, low-profile, low-cost, lightweight, and it is easy to design and manufacture. It has wide application prospects in the future. |
| Author(s): | Q. He, J. Xie, Q. Liu, X. Yao, Z. Wang, H. Chen, F. Li, L. Deng |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2345 KB |
| Title: | A Novel Double-layer Low-profile Multiband Frequency Selective Surface for 4G Mobile Communication System |
| Abstract: | A novel double-layer multiband, low-profile frequency selective surface (FSS) for IMT-Advanced (4G) mobile communication system is presented in this article. On aspired to a minimum transmission coefficient of –10 dB for surface materials when the frequency bands targeted for blocking are stopped. For this project, we chose the dielectric substrate FR4 (loss-tangent = 0.02; dielectric constant = 4.54) and a thickness of 1 mm. Dodecagonal rings, upright bars, and square frame make up the FSS unit cell. The desired frequency responses of the FSS were intended to avoid being changed according to the angle of incidence of the electromagnetic waves. The FSS design is proposed as a symmetrical structure to make it polarization-independent and is aimed to stop 800, 900, 1800, 2100, and 2600 MHz frequencies to prevent harmful effects to human health and interference effects at these frequencies. With a cell size of 0.17λ, the planned FSS is quite small and, thus, has a low sensitivity at the angle of the incident wave. In addition, FSS geometry was manufactured by a printed circuit board (PCB) and measured in a non-reflective environment after being studied in Ansys high-frequency structure simulator (HFSS) software. By comparing the analysis and measurement results of the design, the success of the FSS to the frequencies to be stopped has been verified. The effect of each patch on different frequencies has been examined by drawing the surface current density graphs of the design. |
| Author(s): | S. Balta, M. Kartal |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 4 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 4339 KB |
| Title: | A Miniaturized, Low-Profile, Self-Actuated Radome for EM Protection |
| File Type: | Conference Paper |
| Issue: | Volume: 3-P3-E Perodic Structures Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 351 KB |
| Title: | A Low-Profile, Dual-Polarized Base-Station Antenna with FSS Loading |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-1 Antenna Designs, Simulations, and Measurements for 5G Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1504 KB |
| Title: | A Low-profile Wideband PIFA with Co-design of Ground Plane for WLAN Applications |
| Abstract: | In this paper, a novel low-profile wideband planar inverted-F antenna (PIFA) with co-design of the ground plane for WLAN applications and IoV applications is proposed. This antenna consists of three parts: a slotted radiating patch, a vertical shorting plate and a ground plane with a cross-shaped slot. The influence and the parameter of the slot are discussed. The antenna is fed by a 50 Ω coaxial line and a shorting pin is also used in this design. The overall size of the antenna is 30×44×3.5 mm³. The whole structure is simulated in ANSYS Electronics Desktop 2018.0 and several prototypes are made to verify the simulation results. The bandwidth of the antenna can reach 3.96 GHz (–10 dB) and cover the frequency range of 5.64 – 9.6 GHz. The max gain of the antenna is 5.4 dBi. |
| Author(s): | X. Y. Li, Z. A. Liu, M. S. Tong |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 2 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 15109 KB |
| Title: | A Low-Profile Wideband Circularly Polarized Metasurface Antenna Based on Characteristic Mode Theory |
| Abstract: | A novel low-profile wideband circularly polarized metasurface (MTS) antenna is proposed. The characteristic mode analysis is used to investigate the operating mechanism of the MTS antenna. Then, the desired modes are chosen and excited by the annular ring slot combined with an L-shaped microstrip line. Simulation studies revealed that this type of feeding structure effectively excites the desired modes to accomplish wideband circular polarization and high-gain radiation. Experimental results show that the antenna has both the wide impedance bandwidth (IBW) and axial ratio bandwidth (ARBW), with a maximum radiation gain of 9.3 dBi and a –10 dB relative IBW and 3 dB relative ARBW of 39.8% and 30%, respectively. |
| Author(s): | S. Liu, L. Yang, X. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 11 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2290 KB |
| Title: | A Low-Profile Miniaturized Frequency Selective Surface with Insensitive Polarization |
| Abstract: | In this letter, a low-profile miniaturized broadband bandpass frequency selective surface (FSS) is proposed. The proposed structure consists of a convoluted dipole metal layer and its complementary pattern, which are separated by a dielectric substrate with a thickness of 0.003lambda0, where lambda0 is the resonant wavelength in free space. The cell size of the proposed FSS is only 0.03lambda0 × 0.03lambda0. Furthermore, 3 dB bandwidth of the proposed FSS is approximately 50% for the normal incidence. Low profile and miniaturization of the structure element contribute to the great stability of frequency response under the incident waves with different incident angles and polarizations. To better understand the operational principle of the proposed FSS, the equivalent circuit model is presented. The proposed FSS prototype was fabricated and measured to validate the design. |
| Author(s): | M. Wang, L. Zhao, J. Wang, X. Liang, S. Zhang, Y. Li, W. Yu |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 9 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2195 KB |
| Title: | A Low-Profile Hybrid-Fed Dual-Polarized Antenna with High Isolation and High Cross-Polar Discrimination |
| Abstract: | This work presents a wideband hybrid-fed ±45º linear dual-polarized patch antenna design for sub- 6 GHz 5G base stations. Two polarizations are created by a slot-coupling with rectangular H-slot (+45) and a capacitive coupling with modified L-probe (−45). Antenna exhibits wideband −10 dB impedance bandwidths of 40.7% and 35.6% for slot-fed and probe-fed ports, respectively. Due to the special design of suspended stacked patches with hybrid-fed excitations, high port isolation (< −47 dB) and high cross-polar discrimination (> 38 dB) are achieved. Symmetric and directional radiation patterns with stable gain are obtained in E and H planes for each polarization. Compared to its bandwidth, antenna is low-profile (10.6 mm) with front-to-back ratio greater than 22 dB. Simulations and experimental results are reported and discussed. |
| Author(s): | M. Ciydem, E. A. Miran |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 9 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1994 KB |
| Title: | A Low-Profile Dual-Polarized Crossed Dipole Antenna on AMC Surface |
| Abstract: | A low-profile dual-polarized crossed dipole antenna on artificial magnetic conductor (AMC) surface is presented in this paper. The antenna consists of two orthogonal dipoles, a periodic arrangement of artificial magnetic conductors and a ground floor. The antenna has a section height of only 13mm (0.13λ0, λ0 is the wavelength in free space at 3 GHz). With utilizing the 6×6 unit cell of square patch based AMC, the antenna can achieve a wide band. To verify this design, a prototype of this antenna is designed, fabricated and measured. Measured results exhibit that bandwidth from 2.9 GHz to 3.32 GHz (S11< -10dB) for one port and from 2.995 GHz to 3.47 GHz (S22< -10dB) for another port are obtained, respectively. Meanwhile, the isolation between two ports is less than -30 dB, and stable radiation patterns are realized in operating frequency band. |
| Author(s): | R. He, Z.-H. Yan, Y.-B. Meng |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 7 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1460 KB |
| Title: | A Low-Profile Dual-Polarized Antenna with High Isolation and High Front-to-Back Ratio for 5G Base Stations |
| Abstract: | A dual-polarized, broadband, slot-coupled patch antenna design is presented for sub-6 GHz 5G base stations. Proposed antenna is made up of two suspended stacked patches above feedline layer and is excited by crossed elliptic-H slots for ±45º slant, linear dual polarized operation. Prototyped antenna has an impedance bandwidth of 22.1% (3.14 - 3.92 GHz) for |S11|, |S22| < −15 dB and port isolation |S21| is also obtained to be < −28 dB in this band. Antenna exhibits directional radiation patterns with half power beamwidths of 57º - 65º and 60º - 64º in elevation and azimuth planes, respectively with varying gain of 8.6 - 9.1 dBi. Proposed antenna is also low profile (11.1 mm) with high front-toback ratio (> 27 dB) without reflector. Design details, numerical studies, and measurement results are presented. |
| Author(s): | M. Ciydem |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 9 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1925 KB |
| Title: | A Low-profile Dual-band Dual-polarization Co-aperture Array Antenna with High Isolation |
| Abstract: | This paper proposes a low-profile highisolation dual-polarization array antenna operating in the L/S band. The radiating unit of the array antenna adopts U-shaped bending dipoles to realize the staggered arrangement of high- and low-band units, and is connected to the feeding network by a coaxial cable. To achieve the non-influence of high-band and low-band feed networks, multi-layer printing technology is used and grooves are etched on the metal plate. In order to reduce the coupling of the high- and low-band dipoles at low frequency, a bandpass filter is added to the highband feed network, which greatly improves the isolation at low-frequency. The measured results show that the impedance bandwidth of the array is 4.5% (0.971-1.015 GHz) and 7.5% (1.89-2.04 GHz), with gains of 15 and 19 dBi at 1 GHz and 2 GHz, respectively. And the isolation between the dual-polarized ports more than 50 dB and 35 dB was achieved at 1 GHz and 2 GHz, respectively. The proposed array will have practical value in L/S band full-duplex wireless communication systems. |
| Author(s): | L.-X. Xia, Q. L. Zhou, N.-W. Liu, G. Fu |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 3447 KB |
| Title: | A Low-Profile Circularly Polarized Magnetic-Electric Dipole Antenna Array |
| Abstract: | A low-profile circularly polarized (CP) magneto-electric dipole (MED) antenna array is presented in this paper. By tilting the vertical walls of a MED with two protruded stubs being orthogonal to the horizontal patches and by using a staircase-shaped feeding strip, a wideband CP MED antenna is formed. In comparison to the conventional MED, the profile of the antenna is reduced from 0.25λc to only 0.07λc at the center frequency of the operating band. The sequentially rotated feeding (SRF) network is employed to construct a 2×2 array with enhanced 3 dB axial-ratio (AR) bandwidth. The overall size of the array is as compact as 1.33λc×1.33λc×0.07λc, and the measured results show that the usable overlapped bandwidth of the reflection coefficient |S11|< -10 dB and AR< 3 dB is 31.2%, covering 1.76 GHz to 2.41 GHz. The peak gain of the array is 12.9 dBic with the gain variation being less than 3 dB within the 1.85-2.32 GHz band, and the front-backratio (FBR) is greater than 20 dB. The proposed array is promising in the applications for portable and individual communication devices for wireless communications. |
| Author(s): | P. Zhou, M. He, W. Tian, C. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 12 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1857 KB |
| Title: | A Low-Profile Broadband Circularly Polarised Wide-Slot Antenna with an Artificial Magnetic Conductor Reflector |
| Abstract: | In this letter, a novel broadband circularly polarisation (CP) wide-slot antenna with an artificial magnetic conductor (AMC) as the reflector is presented. The wide-slot antenna is composed of a knife-shaped radiator and an improved ground plane. A broadband CP characteristic can be achieved by slotting the ground plane to make it an asymmetric ground shape. However, the average gain of the wide-slot antenna is only about 3 dBic because of bidirectional radiation. An AMC reflector is adopted to enhance the gain of the wide-slot antenna without introducing a high profile similar to the PEC reflector. In addition, the four metal plates are vertically placed around the antenna to broaden the axial ratio (AR) bandwidth of the antenna with the AMC reflector. The measurement results show that the 3dB AR bandwidth of the proposed CP antenna is 32.4% (2.35GHz─3.26GHz), the average gain is 6.5dBic in the AR bandwidth and the value of VSWR in the AR bandwidth is less than 2. The size of the antenna is 0.84λ0× 0.84λ0× 0.13λ0 at the centre frequency of 2.805 GHz. The proposed antenna has a low profile, broad AR bandwidth and high gain, thereby being a good candidate for various wireless communication systems. |
| Author(s): | F. Fan, X. Fan, X. Wang, Z. Yan |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 6 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1526 KB |
| Title: | A Low-Profile and Beam-tilted Continuous Transverse Stub Array Antenna at W-band |
| Abstract: | This paper presents a low-profile, high gain, beam-tilted continuous transverse stub (CTS) array antenna at W-band. The antenna compromises 32 radiating slots and is fed by a parallel plate waveguide (PPW) network with a linear source generator. To deflect the outgoing beam, the principle of linear array scanning is adopted to design inverted T-type structure in each stub to introduce wave path difference. PPW network allows the antenna to obtain lower profile compared to other transmission lines. The design procedure, and the antenna characterization are described. The main beam of the antenna is titled 12 degree in H-plane. The simulation and measured results show that this antenna achieves peak gain of 32.4 dB and a 12 degree beam tilt angle at 99GHz. S11 parameters of the antenna is less than -10 dB in a broadband from 96 GHz to 103 GHz. This antenna has an advantage of miniaturization over other high-gain antenna solutions. The promising performance of this proposed CTS antenna reveals the possible candidate for Millimeter wave (MMW) telecommunication applications. |
| Author(s): | D. Chu, Y. Xiong, P. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 7 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1690 KB |
| Title: | A High-gain, Low-profile Filtering Antenna Based on a Novel Metasurface |
| Abstract: | In this paper, a filtering antenna based on a metasurface is designed using slot-coupled feeding, and the metasurface unit is a fractal pattern. Replacing the rectangular patch on the metasurface with a fractal patch can introduce a radiation zero point on the upper sideband of the antenna, thereby enhancing the sideband selectivity. In addition, the current is reversed by loading shorting pin, and a radiation zero point is also introduced in the lower sideband. After measurement, the -10 dB impedance bandwidth of the filtering antenna is 23.6% (3.22-4.08 GHz), and the average antenna gain in the passband is 8.1 dBi. The filtering antenna does not involve an additional filter circuit, has a simple structure, and a small size, and ideally eliminates insertion loss. To verify, the real object was made and tested and found that the reflection coefficient, pattern, gain, etc. were in good agreement with the simulation results, it can be applied to the 5G communication frequency band. |
| Author(s): | J. Zhu, G. Zhang, Z. Li, Z. Che, J. Yue, Y. Feng, Q. Zhang, R. Qiu |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 11 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3445 KB |
| Title: | A Flush-mounted Ultra-wideband Scanning Phased Array with End-fire Radiation Pattern |
| File Type: | Conference Paper |
| Issue: | Volume: 4-MP-4 Student Paper Competition I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 513 KB |
| Title: | A Conformal Low-profile Series-fed Microstrip Array for Aircraft Applications |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-B Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 467 KB |
| Title: | A Compact, Low-Profile Dual-Band Patch Filtering Antenna for Off-Body Communications |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-5 Microwave and Antenna Technology for Wireless Body-Centric Systems Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 249 KB |
| Title: | A Compact Low-profile C-band Dual Circularly Polarized Sub-array Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-B Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 501 KB |
| Title: | A Compact Low-profile 5G Millimeter-wave Circularly Polarized Antenna Based on LTCC |
| Abstract: | In this paper, a circularly polarized millimeter-wave L-shaped dipole antenna based on low temperature cofired ceramic (LTCC) technology is proposed, which realizes compact size and low-profile performance. The designed antenna consists of radiation patches and the grounded coplanar waveguide-substrate integrated waveguide (GCPW-SIW) feeding structure, which connects each other by two via holes. The radiation patches include a pair of L-shaped patches and four parasitic patches. The simulated results show that the proposed antenna operates from 26.5 to 29.5 GHz for |S11| < −10 dB and AR < 3 dB with a peak gain of 6.7 dBic. The antenna element size is only 0.58λ0×0.58λ0×0.056λ0, where λ0 is free-space wavelength at the center frequency of 28 GHz. A sample of the antenna is fabricated and measured to verify the proposed design, which has a good agreement with the simulated ones, indicating that the antenna has potential applications for the fifth generation (5G) mm-Wave n257 (26.5 - 29.5 GHz) frequency band communications and satellite communication systems. |
| Author(s): | T. Wang, J. Wang, C. Ding, Z. Miao, J. Wang, L. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 9 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 3016 KB |
| Title: | A Compact and Low-Profile Wideband Circularly-Polarized Slot Antenna Fed by Coplanar Waveguide and Microstrip Line |
| File Type: | Conference Paper |
| Issue: | Volume: S38 Antenna Applications II Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 253 KB |
| Title: | A Broadband Microstrip-Fed Patch Antenna with Harmonic Suppression |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-6 Low Profile and Wideband Antennas Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 404 KB |
| Title: | Tri-polarization Reconfigurable Fabry-Perot Resonator Antenna in Ku-band |
| Abstract: | In this paper, a broadband tri-polarization reconfigurable antenna applied to polarization diversity is proposed. A partially reflective surface (PRS) is designed to form an air-filled resonator cavity. The reflection phase of the PRS has a positive phase gradient in order to achieve the characteristics of the proposed antenna gain enhancement in the wideband. A metal patch of a four-arm meander structure is used as the radiation structure and the feeding is realized through a four-channel rotating feeding network with equal amplitude and 90◦ phase difference. The feeding network is connected to the radiation structure through four metallized vias. In order to realize the polarization reconfigurability, the PIN diodes and the corresponding DC bias circuit are integrated in the rotating feeding network. The characteristics of horizontal polarization (HP), vertical polarization (VP) and right-hand circular polarization (RHCP) are realized by changing the ON/OFF states of PIN diodes integrated in the feeding network. In order to verify the performance of the proposed antenna, fabrication and testing were carried out. The measurement results show that the −10 dB impedance bandwidths of HP, VP, RHCP are 11% (12.5-14 GHz), 6.4% (13.7- 14.6 GHz) and 20% (12.2-14.9 GHz), and the peak realized gains are 9.1, 9.2 and 11.5 dBi, respectively. For RHCP mode, the 3-dB axial ratio bandwidth reaches about 17% (12.35-13.4 GHz and 13.6-14.9 GHz). |
| Author(s): | S. Zhu, J. He, J. Yu, Y. Feng, S. Pan, G. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3046 KB |
| Title: | Study on Fabry-Perot Antennas Using Dipole Exciters |
| Abstract: | Fabry-Pérot (F-P) cavity antennas with Artificial Magnetic Conductor (AMC) ground planes and Frequency Selective Surface (FSS) superstrates have been investigated in this paper. The method of periodic imaging is used to analyze the cavity antennas, and we can calculate the working frequency and quality factor. One or two dipole antennas are utilized to excite the cavity antennas. The results demonstrate that the gain will be enhanced with the increase of the cavity size, and two exciters in the cavity will improve radiation efficiency obviously. |
| Author(s): | Y. Zhang, W. Yu, W. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 12 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 755 KB |
| Title: | Size Reduced Array Antenna with Enhanced Directivity |
| Abstract: | Small array antennas with directive coverage are an attractive solution for size limitation in wireless devices. In this paper, the design of a directive 10 GHz antenna with reduced size microstrip array and frequency selective superstrate (FSS) is presented. Inductive loading and reduced patch separation is used to incorporate 7-elements within a 100x30 mm2 array aperture. The superstrate (FSS) layer is optimized to properly excite the Fabry-Perot cavity and further increase the antenna directivity. Using HFSS software, the reflection response and the radiation pattern of the antenna array is optimized. The simulated responses agreed well with the measured results. |
| Author(s): | S. S. I. Mitu, F. Sultan |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 872 KB |
| Title: | High-gain Wideband Fabry-Perot Resonator Antenna Based on Single-layer FSS Structure |
| File Type: | Conference Paper |
| Issue: | Volume: 2-SE-2 Electromagnetic Characteristics of Complex Media Simulated by Time Domain Method II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 76 KB |
| Title: | High-gain Wideband Fabry-Perot Resonator Antenna Based on Single-layer FSS Structure |
| Abstract: | In this paper, a wideband Fabry-Perot (FP) resonator antenna is designed based on single-layer frequency selective surface (FSS) structure. The antenna adopts a single-layer complementary circular FSS structure as the partially reflecting surface (PRS) of Fabry-Perot resonator antenna to improve the gain. The wideband slot-coupled patch antenna is used as the source. The proposed FSS maintains a positive slope reflection phase gradient in the band of 10.3-16.0 GHz, which satisfies the realization conditions of the wideband Fabry-Perot resonator antenna. The measured results show that the 10-dB impedance matching bandwidth of the proposed Fabry-Perot resonator antenna covers 11.99-15.54 GHz (25.8%), the maximum gain is 13.16 dBi at 14.2 GHz, and the 3-dB gain bandwidth is 26.1%. The measurement results verify the feasibility of the design method. |
| Author(s): | Z. Liu, S. Liu, X. Kong, Z. Huang, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 6 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2000 KB |
| Title: | High Gain Fabry-Perot Cavity Antenna With Phase Shifting Surface |
| File Type: | Conference Paper |
| Issue: | Volume: S53 Antenna and Arrays IV Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 5102 KB |
| Title: | Design of Tilted-Beam Fabry-Perot Antenna with Aperiodic Partially Reflective Surface |
| Abstract: | A fast synthesis model for designing highgain tilted-beam antennas with the aperiodic partially reflective surface (PRS) is presented in this paper. In this model, concepts of array synthesis and thinning are introduced to realize the tilted beam and control the sidelobe level (SLL). Since a large number of data need to be processed during the optimization process, an efficient hybrid real-binary bat algorithm (HRBBA) is proposed and embedded in the model to optimize the loop widths and the absence of the square loops on the PRS. As an example, an antenna with an expected tilted beam in the elevation plane (? = 40°) is manufactured and measured, and both the simulated and measured results show that the antenna can tilt its beam toward the expected direction with good performance. |
| Author(s): | Y.-F. Cheng, W. Shao, X. Ding, M.-X. Yu |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 5 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1779 KB |
| Title: | Unified Formulation for Evaluation and Visualization of Electric and Magnetic Fields Inside Waveguides and Cavities |
| Abstract: | The output of this research is an interactive software package developed to enhance and expedite the design of waveguides and cavity resonators through the computation and visualization of the electric and magnetic field distribution. The software features a userfriendly interface through which users can select one of seven different configurations and specify parameters of their design, such as structure dimensions, transverse electric or magnetic mode, mode numbers, operating frequency, number of points of any of the field components along the x, y, and z axis for rectangular structures, and any 2D plane angles between 0° to 360° for cylindrical structures. Both transverse and longitudinal field components can be visualized in vector, color contour or both. The software makes it easy for users to see how the changes of physical dimensions and operating frequency affect the field distribution. Moreover, the user interface allows users to select how visualizations of the field distribution are generated and displayed. Field distributions can be displayed as static images or video animations using appropriate sequencing of computed field values at different plane cuts. The software provides all necessary warning messages for invalid input parameters. Mathematical expressions of the field components used in this software were derived from the classical solution of the wave equations using the separation of variables technique in cartesian coordinates for rectangular configurations and cylindrical coordinates for all other configurations. Results obtained using this software were validated against values found in the literature for similar types of problems, and results show perfect agreement. |
| Author(s): | Z. Hasan, A. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 6 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 4961 KB |
| Title: | Time-modulated Coupled-cavity System for Optical Switching |
| File Type: | Conference Paper |
| Issue: | Volume: S07 Time Domain Modeling of Switchable and Tunable Devices in Photonics Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 438 KB |
| Title: | Time-modulated Coupled-cavity System for Optical Switching |
| Abstract: | The scattering parameters of a time-modulated twocoupled- cavity system are obtained using coupled mode theory and verified using the finite-difference time-domain method. We find that a suitably tailored time-modulation of the cavities allows for switching the output on and off. The proposed functionality can be used in direct amplitude modulation of an optical carrier from a frequency-modulated RF message. |
| Author(s): | A. Mock |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1304 KB |
| Title: | The Use of Offset Coupled Microstrip Combline Filters for IF Filters Requiring High Selectivity |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using Sonnet - II Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 820 KB |
| Title: | The Isolation Island and the Displacement of Decoupling Capacitors for Power Integrity Issues |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Compatibility and Interference Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 266 KB |
| Title: | Supercavity Modes in Dielectric Resonators Excited by Two Current Sources |
| File Type: | Conference Paper |
| Issue: | Volume: S35 Advanced Time-Domain Numerical Methods For Nonlinear and Quantum Optics with Engineered Materials - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 267 KB |
| Title: | Study on the Matrix Pencil Method with Application to Predict Time-domain Response of a Reverberation Chamber |
| Abstract: | The full wave simulation of reverberation chamber in time domain usually takes large computational time because of its resonant characteristic. This contribution makes the pioneer exploration of accelerating this kind of simulation by time-domain signal prediction. The prediction technique is based on the well known matrix pencil method (MPM). An approximation to the existing MPM is proposed to obtain a new kind of MPM, which is more computationally efficient. To conduct the prediction effectively, the signal’s oversampling should be avoided and the singular values appeared in MPM should be judged appropriately. The signal can be resampled according to Nyquist sampling law while the singular values can be selected by the newly proposed criterion based on cavity theory. For wideband time-domain responses, it is suggested to apply digital band-pass filter before prediction to get higher precision. Using the proposed methods, the computational time can be reduced almost 50 % for the reverberation chamber’s FDTD simulation. |
| Author(s): | S. Wang, Z. C. Wu, L. Du, G. H. Wei, Y. Z. Cui |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 9 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 254 KB |
| Title: | Study on Electromagnetic Properties of Sodium Chloride in Microwave Drying |
| File Type: | Conference Paper |
| Issue: | Volume: 5-P-1 Poster Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 872 KB |
| Title: | Study of the Effects of the Back Cavity on a Broadband Sinuous Antenna and an Optimized Loaded Back Cavity |
| Abstract: | Sinuous antennas, like spiral antennas, have wideband characteristics, such as constant beam width and low axial ratio over a broad range of frequencies, and thus they are suitable for communicating in transmitting and receiving over bands of frequencies that may encompass multiple channels. In the presence of the back cavity, the performance of the sinuous antenna is affected. The purpose of this paper is to study the affects of the back cavity, and use these findings to build an optimized lossy cavity to improve the performance of the sinuous antenna. The performance of the antenna with and without the back cavity is compared to the antenna with the optimized loaded cavity. |
| Author(s): | S. Palreddy, A. I. Zaghoul, R. Cheung |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 8 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 887 KB |
| Title: | Study of The Effects of The Back Cavity on a Broadband Sinuous Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: CEM Applications Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 845 KB |
| Title: | Study of Reduced Size Circular Microstrip Patch Antenna with Two-Pin Loading |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Antenna Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 58 KB |
| Title: | Statistical Analysis of the Normalized Impedance Matrix Derived by the Random Coupling Model |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Electromagnetic Modeling Methods Part II Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 318 KB |
| Title: | Statistical Analysis of an Electrical System within a Reverberant Cavity |
| File Type: | Conference Paper |
| Issue: | Volume: EMC in Complex Systems and Reverberant Environments Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 236 KB |
| Title: | Static and Dynamic Scattering Characteristics of Complex Cavity with Rotating Blades |
| File Type: | Conference Paper |
| Issue: | Volume: 8-TP-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 290 KB |
| Title: | Static and Dynamic Scattering Characteristics of Complex Cavity with Rotating Blades |
| File Type: | Conference Paper |
| Issue: | Volume: 10-TE-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu III Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 290 KB |
| Title: | Spherical Domain Truncation for the FVTD Method |
| File Type: | Conference Paper |
| Issue: | Volume: Finite-Volume and Discontinuous Galerkin Time-Domain Techniques Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 967 KB |
| Title: | SLF/ELF Electromagnetic Field of a Horizontal Dipole in the Presence of an Anisotropic Earth-Ionosphere Cavity |
| Abstract: | In this paper, the region of interest is a cavity between a spherical and electrically homogeneous earth and an anisotropic homogeneous ionosphere. Both the dipole (Vertical Electric Dipole (VED), Vertical Magnetic Dipole (VMD), or Horizontal Electric Dipole (HED)) and the observation point are assumed to be located on or near the spherical surface of the earth. The approximate formulas are obtained for the electromagnetic field of a vertical magnetic dipole and that of a vertical electric dipole in the presence of an anisotropic earthionosphere cavity, respectively. Based on the results obtained, the approximate formulas are derived readily for the electromagnetic field of a horizontal electric dipole in the presence of an anisotropic earth-ionosphere cavity by using a reciprocity theorem. Analysis and computations in SLF/ELF ranges are carried out specifically. |
| Author(s): | G. Z. Li, T. T. Gu, K. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 12 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 488 KB |
| Title: | SIW Cavity-Backed Dual-Polarized Shorted Annular Patch Antenna with High Gain |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-1 Antenna Designs, Simulations, and Measurements for 5G Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 302 KB |
| Title: | Simulation and Analysis of HEMP Coupling Effect on Wires Inside a Cylindrical Shielding Cavity with Apertures |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using Wipl-D Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 229 KB |
| Title: | Simulation and Analysis of HEMP Coupling Effect on a Wire Inside an Apertured Cylindrical Shielding Cavity |
| Abstract: | High altitude nuclear electromagnetic pulse (HEMP) can damage electronic equipments of radar and communication systems. Back door coupling is one of the main ways of HEMP attacks on the electronic devices. In this paper, the three-dimensional (3D) electromagnetic (EM) simulation software MicroStripes7.5, which is based on the transmission line matrix (TLM) method, are employed to investigate the HEMP coupling effect on a wire located inside a cylindrical shielding cavity having one or few apertures. The EM models of the wire and the apertured shielding cavity are constructed, and the induced wire currents through the aperture of cavity are simulated. By comparing the simulation results of the wire with and without shield of the cavity, the shielding effectiveness (SE) is calculated. Further, the effects on induced wire in various cases are compared and analyzed, including single-aperture and multiple-aperture, different incident angles, polarization angles, and wire locations. Also, the cylindrical cavity is compared with the rectangular cavity. |
| Author(s): | S. T. Song, H. Jiang, Y. L. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 6 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 905 KB |
| Title: | Scattering by a 2D Crack: The Meshfree Collocation Approach |
| Abstract: | In this paper, the meshfree collocation method is applied to the problem of EM scattering by a 2D crack in a PEC plane. The hybrid PDE-IE formulation is the mathematical statement of the problem. Consequently, the geometry and the filling material of the cavity is arbitrary. Validations are based on convergence analysis, modal solution and measurement results. Furthermore, elliminating numerical integrations has lead to a fast, accurate, and general meshfree solution. |
| Author(s): | B. Honarbakhsh, A. Tavakoli |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 787 KB |
| Title: | Rigorous Analysis and Design of Resistor-Loaded Patch Antennas with Flexible Gain for Indoor Radar Sensors |
| Abstract: | A high-precision cavity model of resistorloaded patch antenna (RLPA) with adjustable gain is proposed and rigorously studied in this article. In our analysis, the loaded resistors are perceived as controlled current sources, thus the RLPA can be solved as a modified cavity model. Accurate expressions of field distribution, input impedance, and radiation patterns are derived in this way, and a gratifying agreement has been achieved between the calculated and simulated results. Based on this approach, RLPAs for indoor motion radar are designed and analyzed. Comprehensive analysis is conducted to reveal the loading effect on radiation gain, radiation efficiency, and quality factor of RLPAs under various circumstances. Through altering the value of the loaded resistance, its radiation gain and coverage range can be flexibly adjusted. Besides, enhanced operating bandwidth and improved performance stability are also achieved due to the loaded resistors. Last but not least, several indoor motion radars based on the proposed patches are carried out and measured, which demonstrates the validity of the proposed method and design. |
| Author(s): | S.-W. Yu, X. Zhang, Q.-S. Wu, L. Zhu, T. Yuan, H.-Q. Hu |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2950 KB |
| Title: | RF Antenna Design for 3D Quantum Memories |
| File Type: | Conference Paper |
| Issue: | Volume: S25 Microwave Quantum Information Technology - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 738 KB |
| Title: | Resonant Frequency Analysis using Perturbation and Resonant Cavity Method in Printed Dual Band Antenna for WiMAX Application |
| Abstract: | A printed dual-band antenna is designed to resonate at 3.5 GHz with the measured gain of 6.38 dBi and at 5.5 GHz with that of 5.84 dBi for the WiMAX application. The bandwidth of this antenna at 3.5 GHz and 5.5 GHz is 8% and 5%, respectively. The radiation efficiency of 91.45% is obtained at 3.5 GHz and that of 89.56% at 5.5 GHz. A novel approach based on the perturbation technique is used to relate the resonant frequency to the electromagnetic energy stored and the volume of the proposed antenna’s structure. The dual resonant length of this antenna is determined by a parameter named as the length reduction factor, which is computed by the curve fitting method. A polynomial equation connects the length reduction factor and resonance frequency. The resonant cavity model has been used to derive the resonant frequency equations for dual bands. The simulation and measured results are used to validate the analytically predicted resonant frequency caused by the structure perturbation and cavity technique and show good agreement. This antenna is fed by a balanced parallel plane, which conveniently facilitates the PCB’s integration. |
| Author(s): | C. Mahendran, M. Vijayaraj |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 2 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 4370 KB |
| Title: | Reducing Electromagnetic Coupling in Shielded Enclosures using a Genetic Algorithm -- Finite-Difference Time-Domain Solver |
| Abstract: | Comprehensive shielding in modern electronic equipment may lead to resonant behaviour within the equipment enclosure. This paper presents a method for optimising the placement of sources of electromagnetic (EM) energy and susceptors to this EM energy within an enclosed resonant cavity. The source and susceptor are placed on a dielectric slab within a perfectly conducting enclosure to reduce the level of EM coupling between the two. Optimisation is facilitated using a genetic algorithm coupled with a finite-difference time-domain solver. Results are presented for single objective optimisation and multi-objective optimisation cases. |
| Author(s): | Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan, Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 3 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 1130 KB |
| Title: | Reducing Electromagnetic Coupling in Shielded Enclosures using a Genetic Algorithm -- Finite-Difference Time-Domain Solver |
| Abstract: | Comprehensive shielding in modern electronic equipment may lead to resonant behaviour within the equipment enclosure. This paper presents a method for optimising the placement of sources of electromagnetic (EM) energy and susceptors to this EM energy within an enclosed resonant cavity. The source and susceptor are placed on a dielectric slab within a perfectly conducting enclosure to reduce the level of EM coupling between the two. Optimisation is facilitated using a genetic algorithm coupled with a finite-difference time-domain solver. Results are presented for single objective optimisation and multi-objective optimisation cases. |
| Author(s): | Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan, Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 1809 KB |
| Title: | Reduced Order Modeling in TLM |
| File Type: | Conference Paper |
| Issue: | Volume: Hybrid and Coupled Time Domain Solution Methods Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 172 KB |
| Title: | Radiated Fields of Patch Antennas – A Comparison of Simulated and Analytic Results |
| File Type: | Conference Paper |
| Issue: | Volume: S35 EM Modeling Using FEKO II Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 522 KB |
| Title: | RADAR CROSS SECTION OF A RECTANGULAR CAVITY- A MASSIVELY PARALLEL CALCULATION |
| Abstract: | A sequential code that calculates the radar cross section of a rectangular waveguide cavity was modified to execute on a MasPar MP-l massively parallel computer with a SIMD architecture. The code uses the mode matching method of analysis to produce a set of matrix equations. Steps taken to accomplish the parallelization are discussed and some specific examples of program modification are presented. Timing results for wideband data are given that demonstrate the power of parallel computers for this type of application. Suggestions are made for further improvements as increased memory space becomes available. [Vol. 10, No. 2 (1995), pp 30-45] |
| Author(s): | L. D. Vann, L.T. Willet, J.S. Bagby, H.F. Helmken, L. D. Vann, L.T. Willet, J.S. Bagby, H.F. Helmken |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 835 KB |
| Title: | RADAR ANTENNA PATTERN ANALYSIS FOR THE SPACE SHUTTLE USING NEC-BSC |
| Abstract: | In order to improve tracking capability, radar transponder antennas will be mounted on the space shuttle solid rocket boosters (SRB). These four antennas, each being identical cavity-backed helices operating at 5.765 GHz, will be mounted near the top of the SRB's, adjacent to the intertank portion of the external tank. The purpose of this study is to calculate the roll-plane pattern (the plane perpendicular to the SRB axes and containing the antennas) in the presence of this complex electromagnetic environment. The large electrical size of this problem mandates an optical approach, thus a general purpose code, the Numerical Electromagnetics Code - Basic Scattering Code, was chosen as the computational tool. This code is based on the modern Geometrical Theory of Diffraction and allows computation of scattering of bodies composed of canonical shapes such as plates and elliptic cilinders. Apertures mounted on a curved surface (the SRB) cannot be accommodated by the code, so an antenna model consisting of wires was devised that approximated the actual performance of the antennas. Although the method of moments (MM) was not used in developing the antenna model, the code's MM input option proved instrumental in implementing the scheme. The improvised antenna model matched well with measurements taken at the NASA/Marshall Space Flight Center (MSFC) range. The SRB's, the external tank, and the shuttle nose were modeled as circular cylinders, and the code was able to produce what is thought to be a reasonable roll-plane pattern. [Vol. 5, No. l, pp. 39-46 (1990)] |
| Author(s): | Roger Radcllff, Warren Harper, Roger Radcllff, Warren Harper |
| File Type: | Journal Paper |
| Issue: | Volume: 5 Number: 1 Year: 1990 |
| Download Link: | Click here to download PDF File Size: 338 KB |
| Title: | Preparation and Electrical Testing of Double Top Gate Graphene Field-Effect Transistor |
| Abstract: | In this paper, we prepare and test a graphene field-effect transistor with two top gates. The Fermi energy level of graphene can be adjusted by applying positive and negative voltages to the two top gates, and N-type and P-type graphene are formed in the channel region, thus inducing a graphene p-n junction. The current model is established using the gradual channel approximation (GCA) method, and the current and p-n junction characteristics of the device were obtained by formula simulations. Based on the principle of p-n junction luminescence, this device with graphene p-n junction is expected to achieve terahertz wave radiation with an appropriate optical resonant cavity. |
| Author(s): | J. Huang, Y. Wu, B. Su, J. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1646 KB |
| Title: | Predicting the Aperture Coupling to Complex Cavities: A Stochastic Green’s Function Approach |
| File Type: | Conference Paper |
| Issue: | Volume: S23 Advances in Frequency-Domain CEM Techniques and Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 509 KB |
| Title: | Performance Comparison of Uniform EBG and Broadband Progressive EBG Inside a Back Cavity of a Spiral Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Antenna Design and Applications Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 3982 KB |
| Title: | Performance Capability Modeling and Optimization of RF and Millimeter Wave Systems Using Hybrid Statistical/Electromagnetic Techniques |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced EMC Modeling Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 118 KB |
| Title: | Parameter Selection for the Radial Point Interpolation Time-Domain Method |
| File Type: | Conference Paper |
| Issue: | Volume: Time Domain Methods in Numerical Electromagnetics Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 475 KB |
| Title: | Overview of Vital Sign Detection-Simulation and Measurements |
| File Type: | Conference Paper |
| Issue: | Volume: S25 Vital Sign Detection I Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 140 KB |
| Title: | Optimized Design of Substrate Integrated Waveguide Cavity based Oscillators |
| File Type: | Conference Paper |
| Issue: | Volume: Efficient Microwave Subsystem Design and Optimization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 244 KB |
| Title: | Optical Isolation using Compact Time-modulated Cavity Array |
| File Type: | Conference Paper |
| Issue: | Volume: S08 Advances in Finite Difference and Other Numerical Methods for Computational Electromagnetics and Photonics Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 511 KB |
| Title: | Optical Isolation using Compact Time-modulated Cavity Array |
| Abstract: | It is shown using coupled mode theory and verified using finite-difference time-domain simulations how a timemodulated three-cavity array can be designed to allow transmission from port 1 to port 2 but to prevent transmission from port 2 to port 1 thereby implementing optical isolation. The reciprocity of the system is broken by phase-shifting the modulation signal applied to each cavity by 120 degrees which gives the system a synthetic linear momentum. |
| Author(s): | A. Mock |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1395 KB |
| Title: | Numerical Study on Drastic-variation Condition of Electric Field in Microwave Heating System |
| File Type: | Conference Paper |
| Issue: | Volume: 3-4-A Multi-Physics Modelling and Time-Domain and Frequency-Domain Computational Methods Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 241 KB |
| Title: | Numerical Simulation and Experimental Study of ISAR Imaging of Spherical Convergent Flap Nozzle |
| Abstract: | The research on the electromagnetic scattering characteristics of the aero-engine nozzle can provide an important reference for the electromagnetic stealth design of aircraft. In this paper, the numerical simulation and experimental measurement are used to study the radar cross section (RCS) and inverse synthetic aperture radar (ISAR) image characteristics of spherical convergence flap nozzle (SCFN). Firstly, the feasibility of using the shooting bouncing ray (SBR) method to calculate the scattering characteristics of electrically large and deep cavity is verified. Secondly, the numerical simulation data and experimental data of electromagnetic scattering of SCFN are processed by ISAR imaging algorithm, the numerical and experimental ISAR images of SCFN are obtained. The results show that SBR can effectively calculate the RCS of the electrically large size cavity within ± 30° of the axis direction. The polarization influences the experimental ISAR image. Both the numerical and the experimental ISAR image can accurately reflect the scattering center distribution inside the SCFN, and the numerical ISAR image is superior to the experimental ISAR image in image entropy and equivalent number of looks (ENL), and is partly inferior to the experimental ISAR image in terms of image average gradient. The results prove the validity and accuracy of the numerical ISAR image. |
| Author(s): | Y. Liang, Q. Yang, Y. Shi, J. Bai, Q. Lin |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 4 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1877 KB |
| Title: | Numerical Investigation of the Quarter Wave Coaxial Cavity Resonator Quality Factor through Wire Grid Modeling in NEC |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Computer-Aided Design of Electromagnetic Structures and Devices Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 885 KB |
| Title: | Numerical Characterization of Cavity-Backed Aperture- Coupled Antenna Problem using Hybrid Finite Element Method (FEM) / Method of Moment (MoM) technique |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Antenna Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 90 KB |
| Title: | NUMERICAL ANALYSIS OF THE "FERRIS WHEEL" MICE EXPOSURE SYSTEM USING AN EFFICIENT CYLINDRICAL FDTD SCHEME |
| Abstract: | The objective of this study is to develop a numerical tool for characterizing the "ferris wheel" exposure system employed in a long-term study of RF exposure on mice [5]. The "ferris wheel" is a radial cavity loaded with forty mice around its perimeter. In order to exploit the angular periodicity of the radial exposure system, we developed a Finite Difference in Time Domain (FDTD) code based on a cylindrical grid to analyze a single angular sector of the 40-mouse "ferris wheel". The singularity of the Maxwell equations in the cylindrical FDTD scheme was appropriately removed, and other suitable expedients were implemented to reduce simulation time and memory requiremnts. In order to estimate RF leakage, the actual openings in the radial cavity, needed to insert the mice, were considered as well. The FDTD scheme incorporates the perfectly matched layer (PML) unsplit formulation (anisotropic medium), as absorbing boundary condition. The code was validated with measurements, showing good agreement. A criterion for assessing the uniformity of the exposure is presented, together with results at 900 MHz and 1.8 GHz. |
| Author(s): | P. Russo, A. Faraone, P. Russo, A. Faraone |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 2 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 1077 KB |
| Title: | Novel Design of Cavity-Backed Slot Antenna by Reformed Ground Plane (Corner Notch and Stepped) and Elongated Mushroom (EM)-EBG |
| Abstract: | A common problem for the performance of a Cavity-Backed Slot (CBS) antenna could be the heavily effect of ground plane. Travelling surface currents on ground plane could cause destructive effect on the characteristics of CBS antenna. This mainly appears on gain back lobe and also Front to Back Ratio (FBR) of pattern. To resolve this problem, the stepped ground plane and the Extended Mushroom Electromagnetic Band-Gap (EM-EBG) structure was introduced, which could minimize ground plane effects by changing the current distribution. Good agreement was achieved between the simulated and measured results. Experimental results showed that on a frequency range over 14-16 GHz, the gain was better than 11 dB and FBR of pattern in the H-plane reached to 26 dB. |
| Author(s): | S. Manshari, M.-N. Azarmanesh |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 8 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 1125 KB |
| Title: | Novel Compact Substrate Integrated Waveguide Balun Filter and Balanced Filter |
| File Type: | Conference Paper |
| Issue: | Volume: 3-MA-2 Novel Multi-functional Integrated Microwave Circuits and Components Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 392 KB |
| Title: | New Heating Characteristics of a Radio Frequency Rectangular Resonant Cavity Applicator Using Various Antennas for Hyperthermic Treatment |
| Abstract: | The heating characteristics of a radio frequency rectangular resonant cavity applicator excited by various antennas are investigated for use in hyperthermic treatment. The coupled electromagnetic and heat-transfer equations are solved to obtain the heating characteristics. Two types of antennas and three types of dielectric phantoms are used in the calculations and measurements. Clear differences in the heating characteristics are observed for these phantoms and antennas. Previously, we were only able to heat up the surface or end regions of the phantom, while it is now possible to uniformly heat up the deeper regions with the current applicator. Therefore, this applicator is suitable for hyperthermic treatment. |
| Author(s): | Y. Tange, Y. Kanai , Y. Saitoh, T. Kashiwa, Y. Tange, Y. Kanai , Y. Saitoh, T. Kashiwa |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 2 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 798 KB |
| Title: | New Heating Characteristics of a Radio Frequency Rectangular Resonant Cavity Applicator using an L-Type Antenna for Hyperthermic Treatment |
| File Type: | Conference Paper |
| Issue: | Volume: Low Frequency Applications - 1 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 200 KB |
| Title: | New Compact and Broadband Patch Antenna Configurations for Wireless Applications |
| Abstract: | We present new compact patch antenna configurations with broadband capabilities for wireless applications. Analytical, simulation, and experimental work is performed on semi-circular and quarter-circular patch antennas with a shorting pin. The resonant frequencies and radiation fields of the dominant cavity modes of the shorted patch are derived. For the shorted semi-circular patch, the broadband operation is based on the efficient excitation of two staggered modes of the patch. It is shown that a relative bandwidth of 58% is achieved with a patch area that is only 13.6% of the central wavelength squared. The shorted quarter circular patch with the same radius as the half circular one provides a relative bandwidth of about 30%. |
| Author(s): | A. F. Almutairi, N. A. Aljuhaishi, S. F. Mahmoud |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 5 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 341 KB |
| Title: | Near-field BER and EVM Measurement at 5.8 GHz in Mode-stirred Metal Enclosure |
| Abstract: | This work presents over-the-air (OTA) performance, near-field bit-error-ratio (BER), and error vector magnitude (EVM) measurement using software-defined radio (SDR) in the mode-stirred metal enclosure at 5.8 GHz. The metal enclosure is stirred at 5.8 GHz using metallic paddle rotating with uniform speed. Paddle rotation creates a uniform electromagnetic field in the metal enclosure. The electromagnetic field environment in the metal enclosure can be controlled by loading the cavity with absorbing material. Field absorption can be different depending on the amount of absorbing material and location of the absorbers in the metal enclosure. It is shown that signal attenuation increases as we increase the number of absorbers. BER and EVM are measured in this environment and the performance of SDR based digital receiver is analyzed in this environment at RF frequency of 5.8 GHz. |
| Author(s): | M. Lodro, C. Smart, G. Gradoni, A. Vukovic, D. Thomas, S. Greedy |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2052 KB |
| Title: | Narrow Band, Sharp Roll-Off Rejection Frequency Selective Surface Based on Substrate Integrated Waveguide |
| Abstract: | In this paper, a novel frequency selective surface which has a narrower passband and sharper rolloff rejection than the other single layer designs, is presented. Also, it has better independency from angle and polarization of incident plane wave. In this design a ring loop is placed on a cylindrical cavity of substrate integrated waveguide (SIW). Because of the most compatibility between loop and the electric fields of cylindrical cavity, minimum insertion loss and narrow passband are achieved. |
| Author(s): | M. S. Samani, R. S. Shirazi, G. Moradi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 7 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 630 KB |
| Title: | Mutual Coupling of Internal Transmit/Receive Pair in Launch Vehicle Fairing Model using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using Wipl-D Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 593 KB |
| Title: | Multi-Mode Excitation by Interleaved EBG Structure for Suppression of Power/Ground Noise in Multi-Layer PCBs |
| Abstract: | Signal line transition with layer transition via is inevitable in multi-layer PCB. The return current can generate voltage noise between the cavities due to the discontinuity of the return current path. Other layer transition vias passing through the cavity can pick up the voltage noise and result in problems of signal integrity. In this paper, an electromagnetic bandgap (EBG) structure is proposed for suppression of the broadband cavity noise. The impedance discontinuity between layers of interleaved EBG cell enhances the efficiency of noise suppression, and the slots embedded in the EBG cell excite multi-mode resonances for extending the bandwidth of noise suppression. The dispersion diagram is utilized to preliminarily analyze the characteristic of the proposed EBG cell, and a 5×5 cells EBG board is further analyzed for characterizing the efficiency of noise suppression. Both simulation and measurement results prove the proposed structure can effectively suppress the cavity noise under −35 dB over the frequency range from 0.56 GHz to the highest measurement frequency, 20 GHz. |
| Author(s): | D.-B. Lin, Y.-H. Chen, M.-H. Hsieh |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 5 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1662 KB |
| Title: | Multi-channel Combiner Design Using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications Using WIPL-D Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 368 KB |
| Title: | Modulation of the Antenna-Head Interaction inside a Closed Environment Using MOM-GEC Method |
| Abstract: | The interaction between human head and GSM antenna evaluations are usually conducted in freespace situations but wireless communication devices are frequently used in enclosed environments, such as vehicle, that consist of metallic boundaries. In such fully enclosed or semi-enclosed spaces, human exposure in terms of SAR is closely related to the EM field, which is multiplied, reflected and scattered by the metallic walls of the enclosure. This could lead to complicated resonance effects and affections in the antenna performances. This possible argument of an EM field inside an enclosure has raised serious concerns among the general public. This paper will therefore focus on the impact of dipole antenna modeling the handsets on the SAR distribution inside a cavity modeling the vehicle. Theoretical formulation and simulations are used to study this phenomenon but there is a lot of limitations. Despite, modulation using numerical method are used. A MoMGEC modeling approach is applied to study the behavior of a dipole antenna resonating at 1.8 GHz. First of all, we are interested in studying the convergence of the input impedance. The current and the electric field distribution are simulated. The specific absorption rate (SAR) is examined for several different tissues. |
| Author(s): | H. Messaoudi, T. Aguili |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 4 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1857 KB |
| Title: | Modelization of Plasma Breakdown by Using Finite Volume Time Domain Method |
| File Type: | Conference Paper |
| Issue: | Volume: Unstructured Mesh Time Domain Techniques Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 488 KB |
| Title: | Modeling of Photonic Waveguide for Biosensing |
| File Type: | Conference Paper |
| Issue: | Volume: Low Frequency Applications - 2 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 196 KB |
| Title: | Modeling and Realization of Cavity-Backed Dual Band SIW Antenna |
| Abstract: | Herein, substrate integrated waveguide technology is applied in order to design high performance dual-band microstrip patch antennas. Two microstrip patch antenna designs were studied and modeled in 3D electromagnetic simulators. The obtained optimal models were then realized and measured. The measurement performance of the proposed antenna designs were then measured for 2.4 and 5.6 GHz. The results suggest that the proposed model consisting of a modified microstrip cavity-backed antenna and a defected ground structure is a high performance and low cost solution for 2.4 and 5.6 GHz applications. |
| Author(s): | M. A. Belen, P. Mahouti, A. Caliskan, A. Belen |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 11 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1822 KB |
| Title: | Modeling and Experiments of High-Quality Factor Cavity Shielding Effectiveness |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Computational Electromagnetics, Advanced Algorithms and Emerging Applications Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 776 KB |
| Title: | Model to Test Electric Field Comparisons in a Composite Fairing Cavity |
| File Type: | Conference Paper |
| Issue: | Volume: EMC in Complex Systems and Reverberant Environments Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 567 KB |
| Title: | Mode Matching in Microstrip Antenna with both Electric and Magnetic Surface Current on Sidewall in Cavity Model |
| Abstract: | A model is developed to calculate the input impedance of a coaxially fed circular microstrip disc antenna in L band and C band. A mode matching approach with both electric and magnetic surface current is used, which makes it possible to improve the effects of modes. In addition, the method of images is used to remove the ground plane. Finally comparison is made with CST studio results, as it can be seen the theoretical calculations for input impedance are in good agreement with CST studio results except for minor shift in frequency. |
| Author(s): | F. R. Rostami, G. Moradi, R. S. Shirazi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 476 KB |
| Title: | Miniature Printed Magnetic Photonic Crystal Antennas Embedded into Vehicular Platforms |
| Abstract: | In this paper, a miniature printed antenna utilizing magnetic photonic crystal (MPC) modes is presented. Typically, MPC modes are supported by a combination of anisotropic dielectric and ferrimagnetic layers. Here, these modes are emulated using coupled printed lines on a grounded dielectric substrate with small, biased ferrimagnetic inclusions. The resonant antenna is formed by cascading two unit cells excited with a probe feed. A recessed, cavity-backed version of this antenna is embedded into a vehicular platform with a goal to minimize platform effects. Several locations on the vehicle are studied and antenna placement is optimized using a combination of two commercially available electromagnetic simulators. |
| Author(s): | E. Irci, K. Sertel, J. L. Volakis |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 2 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1546 KB |
| Title: | Miniature Printed Magnetic Photonic Crystal Antennas Embedded into Vehicular Platforms |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling, Simulation, and Validation Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 720 KB |
| Title: | Method of Moments Analysis of Electromagnetic Transmission Through an Arbitrarily Shaped 3D Cavity in a Thick Conducting Plane |
| Abstract: | The method of moments (MOM) with surface equivalence principle is used to numerically solve the problem of electromagnetic scattering from and transmission through an arbitrarily shaped 3D cavity in a thick conducting plane is considered. The conducting walls of the cavity inside the ground plane are of arbitrary shape. The apertures at both ends of the cavity are also of arbitrary shape. An equivalent surface magnetic current placed on the top aperture produces the scattered field in the region where the impressed sources are. The total field inside the cavity is produced by two surface equivalent magnetic currents on the apertures and an equivalent surface electric current residing on the walls of the cavity as well as on both apertures. The transmitted field on the opposite side of the impressed sources is computed by an equivalent surface magnetic current residing on the bottom aperture. Computed results are compared with results in the literature obtained by using other methods. Very good agreement is observed. |
| Author(s): | A. B. Olcen, S. T. Imeci, M. Gokten, J. R. Mautz, E. Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1882 KB |
| Title: | Measurement of Complex Permittivity of Polystyrene Composite at 11.64 GHz Using Cavity Perturbation Technique |
| Abstract: | Complex permittivity of polystyrene composites of different percentage of carbon black fillers are measured over the wide frequency range 8-12 GHz using X-band rectangular cavity resonator. The measurement technique uses the cavity perturbation technique. Validity of present measurement technique has been checked by measuring the dielectric properties of wellknown dielectric materials (Teflon and Rexolite). Polystyrene composites are very useful for lightweight shielding and absorbing materials. It would be of great interest for the community to find its dielectric properties over wider frequency range. Due to lack of experimental data on dielectric parameters of carbon black composite in literature, the experimental study has been conducted to measure the dielectric properties of polystyrene composite over wide frequency range of X-band (8-12 GHz). In addition, the estimation of measurement error associated with this technique is also discussed. |
| Author(s): | S. Sharma, D. Kaur |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 349 KB |
| Title: | Mathematical Model for Calibration of Potential Detection of Nonlinear Responses in Biological Media Exposed to RF Energy |
| Abstract: | An efficient way to test for potential unsymmetrical nonlinear responses in biological tissue samples exposed to a microwave signal is to observe the second harmonic in a cavity resonant at the two frequencies, with collocated antinodes. Such a response would be of interest as being a mechanism that could enable demodulation of information-carrying waveforms. In this work, an electric circuit model is proposed to facilitate calibration of any putative nonlinear RF energy conversion inside a high quality-factor resonant cavity with a known nonlinear loading device. The first and second harmonic responses of the cavity due to loading with the nonlinear and lossy material are also demonstrated. The results from the proposed mathematical model give a good indication of the input power required to detect any very weak second harmonic signal in relation to the sensitivity of the measurement equipment. Hence, this proposed mathematical model will assist in determining the level of the second harmonic signal in the detector as a function of the specific input power applied. |
| Author(s): | C. H. See, R. A. Abd-Alhameed, A. F. Mirza, N. J. McEwan, P. S. Excell, Q. Balzano |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 1 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1726 KB |
| Title: | Low Side-Lobe Substrate Integrated Cavity Antenna Array Using Unequal Microstrip-Ridge Gap Waveguide Feeding Network at 94 GHz |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-D Millimeter-Wave GAP Waveguide Technology Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 975 KB |
| Title: | Localization of Breast Tumor Using Four Elements UWB Wearable Antenna |
| Abstract: | In this paper, four wearable UWB antennas are designed to detect and locate tumor cells placed within a heterogeneous phantom at different positions. The proposed antenna is operated within the 4.90 GHz to 15.97 GHz bandwidth range. It is fabricated, measured, and nearly matched between measured and simulated results. A cavity is formulated to back each antenna within the proposed detection system for increasing penetration and gain of propagated electromagnetic waves of the antenna design. The S-parameter of the proposed system was used to detect and locate a small tumor. The SAR results show that the absorbed power by the breast phantom tissues satisfies the IEEE standards which confirms the appropriateness of the proposed antennas for breast cancer early detection and localization system. |
| Author(s): | M. B. Tayel, T. G. Abouelnaga, N. M. Badran |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 10 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2757 KB |
| Title: | L-band Dual Fed EM Coupled Circularly Polarized Circular Stacked Patch Phased Array Design using Antenna Magus and CST MICROWAVE STUDIO |
| File Type: | Conference Paper |
| Issue: | Volume: Applications of Electromagnetic Simulation for Designing and Analysis of Antennas and Radio Propagations Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 822 KB |
| Title: | Koopman Autoencoder Architecture for Current Density Modeling in Kinetic Plasma Simulations |
| File Type: | Conference Paper |
| Issue: | Volume: S18 Time-Domain Techniques for Designing Electromagnetic and Optical Devices - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 650 KB |
| Title: | Ka-Band Wilkinson Power Divider with Integrated Thin Film Resistor |
| File Type: | Conference Paper |
| Issue: | Volume: Graduate and Undergraduate Student Projects in Microwaves and Antennas Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 580 KB |
| Title: | Investigations of All Metal Heat Sink Dual Linear Polarized Phased Array Antenna for Ku-Band Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S15 Antenna Arrays and Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 297 KB |
| Title: | Influence of the Simulation Parameters on the Normalized Impedance Derived by the Random Coupling Model Simulation |
| Abstract: | The random coupling model (RCM, introduced by the “chaos group” in the University of Maryland, is found of great use in making statistical predictions of the induced voltages and currents on objects or components within complicated (wavechaotic) cavities when excited by external high power microwave (HPM) radiation. A key point to applying the RCM to a real system is to generate the normalized cavity impedance, which can be described by the random matrix theory (RMT), from the cavity loss parameter by using random matrix Monte Carlo simulation. The influences of the simulation parameters on the statistics of the generated normalized impedance are presented and discussed in this paper. It’s found that the statistics of the normalized impedance only depends on the loss parameter, ?, which agrees with the theory. When ? increases, the variances of the eigenvalues, the diagonal elements and the off-diagonal elements of the normalized impedance are exponentially damped with different damping factor, which are experimentally verified in the paper. |
| Author(s): | X. Li, C. Meng, Y. Liu, E. Schamiloglu |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 9 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1375 KB |
| Title: | Hybrid Nonlinear and Electromagnetic Design of an Active Oscillator SIW Cavity Backed Slot Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 623 KB |
| Title: | Hybrid Nonlinear and Electromagnetic Design of an Active Oscillator SIW Cavity Backed Slot Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Efficient Microwave Subsystem Design and Optimization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 216 KB |
| Title: | Hybrid Electromagnetic and Non-Linear Modeling and Design of SIW Cavity-Backed Active Antennas |
| Abstract: | This paper presents the modeling and implementation of planar passive and active cavity-backed antennas in substrate integrated waveguide (SIW) technology. The cavity-backed topology helps suppressing the undesired surfacewave modes and may provide better phase noise performance in the antenna oscillator. The use of SIW technology allows for a compact and costeffective implementation of the structure. The design of the active antenna involves both electromagnetic full-wave modeling for the radiating structure and nonlinear analysis of the active circuitry through harmonic balance and transient simulations. Single substrate prototypes of both passive and active antennas operating in X band are presented and measured, showing good agreement with simulated results. |
| Author(s): | F. Giuppi, A. Georgiadis, M. Bozzi, S. Via, A. Collado, L. Perregrini |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 8 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 2673 KB |
| Title: | HMSIW Cavity Filters Employing Various Complementary Split-Ring Resonators for Microwave Remote Sensing Applications |
| Abstract: | In this work, bandpass filters employing half-mode substrate integrated waveguide (HMSIW) cavities and various modified complementary split-ring resonators (CSRRs) are presented. The two modified CSRRs, which are called as Type-I and Type-II CSRRs, can exhibit larger effective inductance and capacitance, and eventually to contribute to the size miniaturization of the resonators. Thereafter, as the two CSRRs are independently loaded into HMSIW cavities, the newlyformed HMSIW-CSRR cavity resonators can achieve more size reduction as compared with the HMSIW cavity with the conventional CSRR. To demonstrate the proposed concept, two HMSIW cavity bandpass filters independently loaded with the proposed Type-I and Type-II CSRRs are implemented. Experimental results shows that measurements of the proposed filters agree with their corresponding simulations well. Meanwhile, as compared with some similar works, the two proposed filters achieve size reduction of 76.8% and 78.6%, respectively, as well as good selectivity, illustrating their suitability for the system integration application in microwave remote sensing and radar systems. |
| Author(s): | L. Wang, Z. He, Y. M. Huang, S. Ding, M. Bozzi |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1910 KB |
| Title: | High-index Resonator Supercavity with Different Background Contrast |
| File Type: | Conference Paper |
| Issue: | Volume: S32 Electromagnetic Analysis on Circuits, Antennas, and Systems - I Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 265 KB |
| Title: | High Performance VHF Diplexer Design Using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using WIPL-D Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 1917 KB |
| Title: | Heating properties of an RF Rectangular Resonant Cavity Applicator for Hyperthermia with Multiple Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: CEM Applications Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 255 KB |
| Title: | Heating Characteristics of a Newly Developed RF Cavity Resonator for Hyperthermia that Targets Deep-Seated Tumor |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Finite Difference Methods and Other Techniques I Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 505 KB |
| Title: | Four-way SIW Filtering Power Divider with In- and Out-of-phase Characteristics and Large Power Division Ratio |
| Abstract: | A novel four-way substrate integrated waveguide (SIW) filtering power divider (FPD) with in-phase and out-of-phase characteristics and a large power division ratio (PDR) is presented in this work. The frequency selection and power division functions are effectively realized by employing SIW resonators at the bottom layer and at microstrip sections at the top layer, respectively. Four microstrip lines coupled with SIW cavity through a slotline realize in-phase and two out-of-phase output characteristics and a large PDR of 7:1. To verify the design method, a four-way prototype with PDR of 7:7:1:1 is designed, fabricated, and measured. Results exhibit good filtering performance, large power division ratio, and in-phase and out-of-phase characteristics. |
| Author(s): | M. Shu, N. Huang, Q. Gao, C. Ma, X. Zhou |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2274 KB |
| Title: | Finite Element Analysis of a QWCCR with Dielectric Slugs |
| File Type: | Conference Paper |
| Issue: | Volume: Dielectric Resonator Antennas Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 257 KB |
| Title: | fficient Improved Local Time Stepping with the Leapfrog Scheme for Transient 3-D Electromagnetic Analyses |
| Abstract: | An alternate boundary local time stepping (ABLTS) method is proposed for the discontinuous Galerkin time domain method for transient electromagnetic simulations to reduce the computation complexity of the local time stepping (LTS) method. The proposed method exhibites lower storage and time complexity than the conventional LF-LTS method . The stability, accuracy, and effectiveness of the ABLTS method are verified by applying it to the simulation of a resonator cavity and multi-layer microstrip antenna. The numerical results revealed that the developed method is effective for the transient electromagnetic simulation of antennas. |
| Author(s): | M. Li, Q. Wu, Z. Lin, Y. Zhang, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 8 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 8687 KB |
| Title: | FDTD Modelling of Optical Polarisation Rotation in a Charged Quantum Dot - Micropillar System |
| File Type: | Conference Paper |
| Issue: | Volume: S13 Advanced Time Domain Solvers for Multiphysics Modeling in Photonics Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 2327 KB |
| Title: | Fast and Accurate FEM based Model for the Periodic Layered Structure of Vertical Cavity Surface Emitting Lasers |
| File Type: | Conference Paper |
| Issue: | Volume: S21 Photonics Modeling and Applications Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 502 KB |
| Title: | Extending the Uniformly Stable Conformal Technique to Model Curved PEC Objects in 3-Dimensional High-Order FDTD |
| File Type: | Conference Paper |
| Issue: | Volume: Finite Difference Methods Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 439 KB |
| Title: | Extended Radar Return from a Rocket Engine: A Thermal Model |
| File Type: | Conference Paper |
| Issue: | Volume: Topics in Radar Scattering Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 129 KB |
| Title: | Electromagnetic-thermal Field Simulation of a Novel Cavity Device with Accelerated FDTD method |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Electromagnetic Modeling Methods Part I Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 261 KB |
| Title: | Electromagnetic-Thermal Analysis of an RF Rectangular Resonant Cavity Applicator for Hyperthermia Targeting Deep-Seated Tumor and Using Thermal Modulation |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in FDTD Method and Applications Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 315 KB |
| Title: | Electromagnetic Scattering by Multiple Cavities Embedded in the Infinite 2D Ground Plane |
| Abstract: | This paper is concerned with the mathematical analysis and numerical computation of the electromagnetic wave scattering by multiple open cavities, which are embedded in an infinite two-dimensional ground plane. By introducing a new transparent boundary condition on the cavity apertures, the scattering problem is reduced to a boundary value problem on the two-dimensional Helmholtz equation imposed in the separated interior domains of the cavities. The existence and uniqueness of the weak solution for the model problem is studied by using a variational approach. A block Gauss-Seidel iterative method is introduced to solve the coupled system. Numerical examples are presented to show the efficiency and accuracy of the proposed method. |
| Author(s): | P. Li, A. W. Wood |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 7 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 518 KB |
| Title: | Electromagnetic Scattering by a Protruding Cavity Embedded in an Impedance Plane |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Session Number: Year: 2008 |
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| Title: | Electromagnetic Modeling of an Adaptable Multimode Microwave Applicator for Polymer Processing |
| Abstract: | This paper presents the electromagnetic modeling of a novel adaptable multi-feed multimode cylindrical cavity applicator where the spatial distribution of the electric field can be specified a priori to accomplish a desired processing task. The electric field intensity inside the cavity can be tailored by just varying the power delivered to each port, and the mode-switching can be realized without mechanically adjusting the cavity dimensions. An orthogonal feeding mechanism is developed to reduce the cross coupling between the ports. Numerical simulations are performed for the cavity applicator to verify the theoretical analysis. |
| Author(s): | R. Sun, L. C. Kempel, L. Zong, S. Zhou, M. C. Hawley, R. Sun, L. C. Kempel, L. Zong, S. Zhou, M. C. Hawley |
| File Type: | Journal Paper |
| Issue: | Volume: 20 Number: 1 Year: 2005 |
| Download Link: | Click here to download PDF File Size: 856 KB |
| Title: | Electromagnetic Modeling of an Adaptable Multimode Microwave Applicator for Polymer Processing |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in CEM Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 376 KB |
| Title: | Electromagnetic Coupling Analysis of Transient Excitations of Rectangular Cavity through Slot using TD-EFIE with Laguerre Polynomials as Temporal Basis Functions |
| Abstract: | This paper presents an electromagnetic coupling analysis of transient waves excited a rectangular cavity containing an interior scatterer coupled to an external scatterer through a slot. Based on the equivalence principle, time domain integral equations are established by enforcing the boundary conditions on the internal and external scatterers, the slot and the cavity walls. The method of moments is applied in space and time domains to solve the developed system of integral equations. The unknown coefficients of the electric and magnetic currents are approximated by the triangular piecewise functions associated with Dirac function as space basis. To obtain accurate and stable solutions, the Laguerre functions are used as temporal basis. Numerical results involving the coupling effects between the cavity components are investigated. The numerical results are found to be in good agreement with EM theory and literature. |
| Author(s): | D. Omri, T. Aguili |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 10 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1645 KB |
| Title: | Electrodynamics of Dipolar Beads in an Electrophoretic Spherical Cavity |
| Abstract: | The transient dynamics of dipolar beads in an electrophoretic spherical cavity presents an interesting phenomenon, because it captures the interplay of electrophoretics, particle dynamics, and tribology. The problem geometry is described by a dipolar bead immersed in a polarized fluid within the cavity. Switching bias voltages are applied to induce both translational and rotational motion of the bead. This paper details a model of coupled phenomena which employs ODE’s to describe the bead dynamics, integral equations for the field solution, and particle simulation for the bipolar migrations. Special focus is given to the impact of confinement and gravitational force on the bead dynamics. |
| Author(s): | M. H. Lean, A. R. Völkel |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 6 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 343 KB |
| Title: | Electrodynamics of Dipolar Beads in an Electrophoretic Spherical Cavity |
| File Type: | Conference Paper |
| Issue: | Volume: Low Frequency Electromagnetic Applications Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 129 KB |
| Title: | Electric Field Enhancement with a Porous Spherical Cavity Resonator Excited by an External Plane Wave |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using Wipl-D Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 5017 KB |
| Title: | Efficient Electromagnetic Scattering Analysis of Open-ended Circular Cavities with Modal MoM Method |
| Abstract: | An efficient and accurate technique is introduced to calculate the scattered electromagnetic (EM) fields from an open-ended circular cavity (OECC). In this paper, it is assumed that the OECC is perforated in an infinite perfect electric conductor (IPEC). Then, the scattered fields are calculated using modal Method of Moments. The complexity and computational cost of the encountered quadruple integrals are addressed in detail. Here, the singularities are extracted and resolved. Next, the scattered far field of a circular PEC plate of the same size is calculated by physical optics approximation. The final OECC scattered field is the sum of these two solutions. A very good agreement is observed between the results of this method and full wave numerical simulations and measurements. The proposed approach is highly efficient and accurate over a wide range of frequencies and incidence angles, making it appealing for analysis of large frequency dispersive structures. |
| Author(s): | A. Aghabarati, P. Dehkhoda, A. Tavakoli |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 11 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2341 KB |
| Title: | Efficient Analysis of High Frequency EMC Problems in Complex Cavities |
| File Type: | Conference Paper |
| Issue: | Volume: High Frequency Techniques Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 540 KB |
| Title: | Efficient Analysis of Backscattering from Very Large Cavity Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in CEM Applications II Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 234 KB |
| Title: | Effect of Curvature on the Performance of a Cylindrically-Conformal Cavity-Backed E-patch Antenna |
| Abstract: | The behavior of a cavity-backed Epatch antenna placed conformal to a cylindrical conducting surface is explored through simulations and experiment to determine the effects of curvature on antenna performance. It is shown that introducing a cavity backing reduces the bandwidth of an E-patch, but that the curvature of a conformal antenna partly compensates for the loss of performance. It is further shown that the curvature of a conformal antenna strongly affects both the co- and cross-polarization gain patterns. |
| Author(s): | C. M. Gardner, L. C. Kempel, J. A. Hejase, R. O. Ouedraogo, S. W. Schneider |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 11 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1648 KB |
| Title: | Dynamic Mode Decomposition for Prediction of Kinetic Plasma Behavior |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Modeling and Applications – II Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 1848 KB |
| Title: | Dual-Band Wide-Angle Circularly-Polarized Microstrip Antenna by Ferrite Ring Inserted in Its Cavity Domain |
| Abstract: | In this paper coaxially-fed circular microstrip patch antenna with ferrite ring in its cavity domain is presented in order to obtain dual-band circularlypolarized antenna in X-band having wide angle axial ratio in both bands. A mode matching approach is used to see the effects of each mode on input impedance of the antenna and is validated numerically by finite element method. The theoretical calculations for input impedance are in good agreement with full-wave simulation. The scattering and radiation parameters of the antenna are investigated. The antenna patch radius and height are 8 and 1 mm, respectively. The ferrite ring was made of yttrium iron garnet (YIG) and the substrate of antenna is Rogers RT5880. In the first band the antenna has 7 dB gain and the ratio of Copol/Xpol is about 24 dB and in the second band has 5 dB gain and the XPD, i.e., the ratio of Copol to Xpol is about 20 dB. |
| Author(s): | F. R. Rostami, G. Moradi, R. S. Shirazi |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 1 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1769 KB |
| Title: | Drastic-Variation Condition of Electric Field and Its Applications in Microwave Heating |
| Abstract: | Microwave heating usually leads to nonuniform temperatures due to the existence of drasticvariation of electric field. In this paper, a numerical method combined with integral equation and spectrum analysis is proposed to find its critical condition. Results show that the electric field is generally unstable, and a tiny shift in microwave frequency, permittivity of dielectric object or cavity geometrical parameters will produce a drastic variation in electric field distribution, moreover, the smallest shift of parameter can be obtained by the reverse search. FEM method is used to verify the conclusions. Finally, some supplements for the interest regarding practical applications are presented and analyzed. |
| Author(s): | Z. Tang, S. Zhang, T. Hong, F. Chen, K. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 5 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2109 KB |
| Title: | Domain Decomposition Method for Scattering from an Aircraft with Jet Engine Inlet Cavity |
| Abstract: | Monostatic radar cross section (RCS) of an combat aircraft is analyzed using iterative Least Square Method weighted domain decomposition method (LSM weighted DDM). The model of the 200 wavelengths long aircraft is made of perfect electric conductor (PEC). Inlet cavity of the jet engine is included in the model. The inlet has realistic shape, whereas cavity is closed with a PEC on the outlet side. Corresponding model without the inlet is also analyzed—the inlet contour is smoothed, and then it is closed with a PEC. Method of moments (MoM) solution is used as a reference. It is shown that the LSM weighted DDM solution can provide very good solution in just a few iterations if problematic parts of the structure are extracted in separate subdomains. |
| Author(s): | M. S. Tasic, B. M. Kolundzija, T. S. Milosevic |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2557 KB |
| Title: | Domain Decomposition Method for Scattering from an Aircraft with Jet Engine Inlet Cavity |
| File Type: | Conference Paper |
| Issue: | Volume: S60 Numerical Methods for Analysis, Design and Measurement of Antennas II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1230 KB |
| Title: | Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas |
| Abstract: | This paper presents a novel approach to facilitate the design of wideband, cavity-backed spiral antennas. Using this approach, first, a 2-18 GHz, two-arm cavity backed Archimedean spiral antenna has been designed in FEKO. A multilayer dielectric absorber has been introduced in the cavity to facilitate unidirectional operation of the antenna. In order to incorporate the frequencydependent complex permittivity data of the absorbing materials inserted in the cavity, precise microwave instrumentation has been used to determine these parameters experimentally. Based on this data, a genetic algorithm optimization procedure has been applied to derive the most favorable geometry of the absorbing cavity. Our results show that a design thus optimized significantly improves key performance parameters, maximizes the co-polarized gain, and minimizes the cross-polarized gain of the antenna across its operational bandwidth. We have then extended the approach to the design of a zigzagged 2-arm Archimedean spiral antenna and also a 1.5:1 ratio elliptical spiral antenna and presented the radiation characteristics here. |
| Author(s): | N. Rahman, A. Sharma, M. Asfar, S. Palreddy, R. Cheung |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 2 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 788 KB |
| Title: | Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using FEKO Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 200 KB |
| Title: | Development of Diplexers Based on Dual-Mode Substrate Integrated Waveguide Cavities |
| Abstract: | Diplexers based on dual-mode Substrate Integrated Waveguide (SIW) cavities are proposed and implemented. The dual-mode cavities not only act as a resonator for both Rx and Tx channels, but also as the interconnect between these two channels which help to realize the isolation. The dual-mode cavities resonating at TE201 and TE103 modes in our design show several advantages than those dual-mode cavities operating at TE201 and TE301 modes. Single-mode cavities are cascaded with the dual-mode cavity to realize the two-order filters for Rx and Tx channels. Two design examples are presented with a normal printed circuit board process and verified by experiments. |
| Author(s): | H. Chu, R. Mao, J.-X. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 2 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 874 KB |
| Title: | Development of a Broadband Substrate Integrated Waveguide Cavity Backed Slot Antenna Using Perturbation Technique |
| Abstract: | A novel method for bandwidth enhancement of Substrate Integrated Waveguide (SIW) cavity-backed slot antenna is introduced for a single element and an array configuration. Using a corner cut in the SIW square cavity, resonant frequency of two degenerate TE210 and TE120 modes of a square cavity are separated and impedance bandwidth is improved. The simulated and measured results of the antennas show at least 140% and 220% wider bandwidth compared to the bandwidth of a conventional single cavity antenna for single and two element array antennas, respectively. The presented antennas provide a few advantages including low profile, light weight, easy fabrication with low cost and convenient integration with planar circuits. |
| Author(s): | E. Baghernia, M. H. Neshati |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 11 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 1204 KB |
| Title: | Design of Slot Antennas and Arrays Using the FDTD Technique and a Parallel Supercomputer |
| File Type: | Conference Paper |
| Issue: | Volume: FDTD Methods and Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 2074 KB |
| Title: | Design of Omni-Directional Cavity Backed Antenna for Aerocraft Application |
| File Type: | Conference Paper |
| Issue: | Volume: 1-3-B Space Antennas I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 513 KB |
| Title: | Design of a Microstrip Conform GPS Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Applications of FEKO Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 245 KB |
| Title: | Design of a Cavity Backed 15:1 Bandwidth Two Arm Spiral Helix Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S45 UWB and Multi-Band Antennas II Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 1103 KB |
| Title: | Design and Full-Wave Analysis of Cavity-Backed Resistively Loaded Circular-End Bow-Tie Antennas for GPR Applications – Part II |
| Abstract: | In this paper, a comprehensive analysis of a novel GPR antenna featuring almost 30 : 1 relative bandwidth (55 MHz ? >1.5 GHz), with a maximum antenna size of 40 cm is performed. Antenna transient behavior, near-field radiation, and impact of the ground are analyzed in details. It has been shown that the antenna exhibits reduced and short ringing, low spurious energy emission in the air region, as well as stable circuital and radiation properties over different types of soil. Furthermore, the analysis of buried pipe detection using two such antennas has been performed. Novelty of such investigation lies in the fact that at the lowest operational frequency both the receive antenna and buried pipe are situated in the near-field region, whilst at the highest operational frequency only the far field is playing the role. From this analysis, antenna coupling level and waveforms of the target return, which are of crucial importance for GPR system design, are determined. |
| Author(s): | D. Caratelli, A. Yarovoy |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 10 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 5952 KB |
| Title: | Design and Full-Wave Analysis of Cavity-Backed Resistively Loaded Circular-End Bow-Tie Antennas for GPR Applications – Part I |
| Abstract: | In this paper, the design of cavitybacked bow-tie antennas for ground-penetrating radars is presented. Dielectric embedding and resistive loading of the radiating structure are employed to achieve at least 30 : 1 relative bandwidth (55 MHz? >1.5 GHz), with a maximum antenna size of 40 cm and stable antenna performance over different types of the ground. The design procedure is described in detail and provides useful guidelines for the considered class of radiators. Antenna parameters are optimized numerically to combine a large operational bandwidth with reasonably high antenna efficiency. To this end, a full-wave locally conformal finite-difference time domain procedure useful to model electromagnetic structures having complex geometrical and electrical characteristics in the vicinity of the ground is adopted. |
| Author(s): | D. Caratelli, A. Yarovoy |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 10 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 2276 KB |
| Title: | Cylindrical Dielectric Resonator Antenna Housed in a Shallow Cavity in a Hollow Circular Cylindrical Ground Plane |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling, Simulation, and Validation Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 156 KB |
| Title: | CRLH Extended Equivalent Circuit (EEC) FDTD Method and its Application to an Open Metamaterial-Loaded Resonator |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling Methods for Metamaterials Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 436 KB |
| Title: | Convergence Acceleration of Infinite Series Involving the Product of Riccati–Bessel Function and Its Application for the Electromagnetic Field: Using the Continued Fraction Expansion Method |
| Abstract: | A summation technique has been developed based on the continuous fractional expansion to accelerate the convergence of infinite series involving the product of Riccati–Bessel functions, which are common to electromagnetic applications. The series is transformed into a new and faster convergent sequence with a continued fraction form, and then the continued fraction approximation is used to accelerate the calculation. The well-known addition theorem formula for spherical wave function is used to verify the correctness of the algorithm. Then, some fundamental aspects of the practical application of continuous fractional expansion for Mie scattering theory and electromagnetic exploration are considered. The results of different models show that this new technique can be applied reliably, especially in the electromagnetic field excited by the vertical electric dipole (VED) source in the “earth-ionospheric” cavity. The comparison among the new technology, theWatsontransform, and the spherical harmonic series summation algorithm shows that this new technology only needs less than 120 series items which is already enough to obtain a small relative error, which greatly improves the convergence speed, and provides a new way to solve the problem. |
| Author(s): | Z. Fanghua, D. Qingyun, Y. Zhe, G. Ya |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 12 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2668 KB |
| Title: | Comparison between Measurements and Numerical Computation for the System Level Characterization of the Radiated Emissions of Unknown Sources inside Cavities |
| File Type: | Conference Paper |
| Issue: | Volume: Guided Waves in Non-Standard Media Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 115 KB |
| Title: | Compact Substrate Integrated Waveguide Band-pass Rat-race Couplers Based on Mixed Shape Cavity with Flexible Port Topology |
| Abstract: | A new type of compact band-pass rat-race couplers with flexible port topology based on mixed shape substrate integrated waveguide (SIW) cavity is first proposed in this paper. Moreover, composite right/left-handed (CRLH) SIW unit loaded on the common wall between cavities is used to achieve negative coupling structure. The diameter of the vias on the common wall related CRLH-SIW unit is also used to adjust the electric coupling strength and increase the coupling bandwidth. The detailed analysis and the design method have been introduced to realize a filtering rat-race coupler based on substrate integrated fan-shaped cavity (SIFC) and rectangular cavity (SIRC). In particular, the combination of mixed shape resonators and port location in rectangular resonators can be selected according to the requirement of port angle interval. Compared with other filtering couplers, the proposed designs exhibit good filtering responses, high Q factor, better isolation, multiple port angle intervals, amplitude balance, as well as 0° and 180° phase differences. |
| Author(s): | Z. Zhang, Y. Fan, Y. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 4 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2511 KB |
| Title: | Compact Multilayer Substrate Integrated Waveguide Dual-band Filtering Rat-race Coupler Based on Fan-shaped Cavities |
| Abstract: | A new type of multilayer dual-band filtering rat-race coupler based on fan shaped substrate integrated waveguide (SIW) cavity is first proposed in this paper. Resonant frequencies of SIW fan-shaped cavity (SIFC) have been derived to construct a resonant cell. Magnetic and electric coupling between SIFCs are realized through multiple rectangular and circular slots located on metal layer, respectively. Specifically, the multiple rectangular slots are beneficial to increase coupling bandwidth and achieve better amplitude and phase balance. Moreover, the bandwidth ratio and center frequency of two pass-bands can be flexibly controlled by adjusting the size of band-stop resonators. The detailed analysis and the design method based on coupling matrix have been introduced to realize a dual-band filtering rat-race coupler. The new type of component should be able to provide at least three functions simultaneously, including in-phase and out-ofphase power dividing, filtering, and dual-band operation. Compared with other filtering couplers, the proposed design exhibits good dual-band filtering responses, high Q factor, better isolation, amplitude balance, as well as 0° and 180° phase differences. |
| Author(s): | Z. Zhang, Y. Fan, Y. Cheng, Y. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 3 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2233 KB |
| Title: | Compact Modified Quarter Mode Substrate Integrated Waveguide Resonator and Its Application to Filters Design |
| Abstract: | A novel compact modified quarter mode substrate integrated waveguide (QMSIW) resonator is proposed. The dominant resonant mode of the proposed resonator is TE101 mode. Using modified QMSIW resonator can reduce 97.3% in size with respect to its corresponding substrate integrated waveguide (SIW) counterpart. With the new coupling structures, the miniaturized cavity can be properly arranged in the filter design to minimize the footprint of the circuit. Two novel filters using compact modified QMSIW cavity are designed, and these proposed compact filters are fabricated to prove the predicted results in experiments, in which good agreement is obtained. |
| Author(s): | Y.-Z. Zhu, W.-X. Xie, X. Deng, Y.-F. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 2 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1878 KB |
| Title: | Compact Integrated Circular Polarization Filtering Antenna based on SIW |
| Abstract: | In this paper, a compact integrated circular polarization filtering antenna is proposed based on substrate integrated waveguide (SIW) cavity. Firstly, a dual-mode (TE102 and TE201 modes) rectangular cavity is utilized as a common feeding cavity to achieve a dual-mode filtering response. And then, an additional rectangular patch with a slot is coupled from the feeding cavity for circular polarization radiation. To verify the proposed concept, a prototype circular polarization filtering antenna is simulated. The circular polarized filtering antenna resonates at 4.225 GHz with a low cross-polarization and a high gain of 7.23 dBi. |
| Author(s): | Q. Gao, Y. Zhu, X. Yang, R. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 12036 KB |
| Title: | Compact 3-D Multilayer Substrate Integrated Circular and Elliptic Cavities (SICCs and SIECs) Dual-mode Filter with High Selectivity |
| Abstract: | In this paper a multilayer dual-mode complementary filter is developed based on the substrate integrated circular and elliptic cavity (SICC and SIEC). The filter is constructed with a SICC and double SIECs, and each cavity supports two degenerate modes, which can be generated and controlled by the coupling aperture and the slot located between layers. With multilayer topology, the structures can exhibit vertical coupling between vertically stacked dual-mode cavities. It does not only have the good performance, but also reduces the circuit size much more. Moreover, sharp transition characteristic in both the lower side and the upper side demonstrates high selectivity of the filter. Good agreement is obtained between the simulated and measured results of the proposed structure. |
| Author(s): | Z. G. Zhang, Y. Fan, Y. H. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 4 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 969 KB |
| Title: | Cavity-Backed Slot V2X Antenna for Automotive Applications |
| Abstract: | In this work, a cavity-backed slot antenna has been designed to cover vehicle-to-everything (V2X) frequencies (5:85–5:925 GHz). The antenna is made to be easily integrated in a vehicle windshield or rear mirror. The cavity-backed slot antenna does not require a ground plane to sit on which makes it an ideal model for below horizon performance. Antenna simulation has been done using high-frequency structure simulator (HFSS) and then on-foam and on vehicle’s windshield measurements have been carried out inside an anechoic chamber. The proposed antenna achieved a linear average gain (LAG) above 2.5 dBi in the targeted V2X elevation and azimuth angles with better than 15 dB return loss. The antenna performance has been reported in terms of reflection coefficient, surface current density, radiation pattern, LAG, and efficiency. |
| Author(s): | M. O. Khalifa, A. M. Yacoub, D. N. Aloi |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 3 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 920 KB |
| Title: | Cavity-Backed Dual-Sinuous Antenna Modeling |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Advances in Electromagnetic Modeling by WIPL-D - II Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 1128 KB |
| Title: | Cavity-Backed Dual-Sinuous Antenna Modeling |
| Abstract: | Recently, for Radio Frequency (RF) signal identification on air vehicles, it has become critical to not only be able to detect the direction and angle of arrival of signals, but to also properly identify the polarization of such signals. For decades, cavity-backed dual-spiral antennas were heavily used for this purpose. However, that required the placement of both right-hand and left-hand elements to perform this function. Due to limited space and other issues, an alternative type of broadband antenna had to be identified. The Cavity-Backed Dual-Sinuous (CBDS) antenna makes an excellent replacement for this function. With its elements rotated 45° about its center, each element exhibits slant linear performance. Such an antenna, paired with proper connections and detection hardware, allows the detector to determine the polarization of arriving RF signals. A CBDS antenna was developed in the WIPL-D CEM code. Its RHCP and LHCP performance was studied over a broad range of frequencies. Results did prove that CBDS antennas have excellent broadband performance and polarization extraction. |
| Author(s): | R. P. Ortega, N. M. Christensen, S. N. Tabet |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1753 KB |
| Title: | Cavity Filter Design and Optimization in WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using Wipl-D Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 579 KB |
| Title: | CAD of Inductive Iris Waveguide Filter with Dielectric Filled Cavities |
| File Type: | Conference Paper |
| Issue: | Volume: Fast and Efficient Methods for Transmission Lines and Waveguides Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 117 KB |
| Title: | BROAD BAND MODELLING OF ELECTROMAGNETIC WAVE COUPLING TO SCATTERERS INSIDE A METALLIC CAVITY |
| Abstract: | In this paper we present an approach based on the method of moments for the solution of an electromagnetic compatibility problem. We determine the results of the impact of an electromagnetic wave on metallic housings with small holes. By separating the interior and the exterior of the housing we are able to use the Green’s functions of the cavity. The number of unknowns is therefore reduced compared to solutions using the free space Green’s functions. Different sets of functions (either local or global) are used for the method of moments (MoM). Furthermore, we present a method to generate broad band data from only a few computations by using an “intelligent” interpolation procedure. Finally, we present an experimental setup and compare our computations with measurements. |
| Author(s): | J. v. Hagen, W. Tabbara, D. Lecointe, J. v. Hagen, W. Tabbara, D. Lecointe |
| File Type: | Journal Paper |
| Issue: | Volume: 13 Number: 3 Year: 1998 |
| Download Link: | Click here to download PDF File Size: 621 KB |
| Title: | Beam Position Monitoring Model of Microstrip Patch Antenna for Particle Accelerators |
| File Type: | Conference Paper |
| Issue: | Volume: S23 RF/Microwave Electromagnetics - Computational Modeling and Experiments Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 396 KB |
| Title: | Bandwidth Design of Ferrite-Based Circulators |
| File Type: | Conference Paper |
| Issue: | Volume: S09 Microwave/Millimeter Wave and Terahertz Devices and Applications II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 662 KB |
| Title: | Axisymmetric Electromagnetic Resonant Cavity Solution by a Meshless Local Petrov-Galerkin Method |
| Abstract: | This work describes a meshless approach to obtain resonant frequencies and field distributions in axisymmetric electromagnetic cavities. The meshless local Petrov-Galerkin is used with shape functions generated by moving least squares. Boundary conditions are imposed by a collocation method that does not require integrations. The proposed analysis has simple implementation and reduced computational effort. Results for TE and TM modes of cylindrical and spherical cavities are presented and compared with analytical solutions. |
| Author(s): | R. D. Soares, R. C. Mesquita, F. J. S. Moreira |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 10 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 858 KB |
| Title: | AUTOMATIC AND EFFICIENT SURFACE FDTD MESH GENERATION FOR ANALYSIS OF EM SCATTERING AND RADIATION |
| Abstract: | The finite difference time domain (FDTD) method has found very wide applications in the analysis of electromagnetic scattering and radiation. The first and most important issue of the FDTD modeling is to decompose a computation space, containing a given geometry, into FDTD unit cells. There are a few dedicated mesh generators which could discretize the space into cells for general analysis. However, among FDTD applications, a large portion of them deal with objects structured primarily with conducting and/or thin-dielectric plates, such as a conducting sphere or cube, a cavity, an airplane, etc. The mesh data necessary to input are those of node indices and material parameters on the object surface. Consequently geometry modeling is essentially to generate FDTD cells on the surfaces. For this purpose, a simple and effective algorithm capable of on- surface FDTD mesh generation is introduced based on a ray-tracing method. The algorithm presumes that the input geometry is described in polygons and lines which are often approximations of smooth surfaces and thin wires. In output, the algorithm decomposes automatically the polygons and lines into on-surface cells compatible with, and readable by, an FDTD solver. The algorithm has been coded in programs allowing effective and automatic generation of surface cells on various high- or low-end computer platforms. [Vol. 9, No. 2 (1994), pp 162-169] |
| Author(s): | W. Sun, M.P. Purchine, J. Peng, C.A. Balanis, G.C. Barber, W. Sun, M.P. Purchine, J. Peng, C.A. Balanis, G.C. Barber |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 2 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 1617 KB |
| Title: | Analytical Model for E-Shaped Microstrip Patch Antenna |
| Abstract: | This paper presents a comprehensive insight of the E-shaped microstrip patch antenna through the introduction of its cavity model and circuit model. The cavity model of the E-shaped antenna postulates a central magnetic wall that subdivides the structure into two halves, each with the TM001 field configuration. On the other hand, the circuit model is formulated based on the segmentation yielded from the cavity model. It infers the dual-resonance of the antenna through its circuit equivalent aspect, while avoiding cumbersome computations. Both these models offer an in depth view on the operating principles of the E-shaped antenna and effectively relates to its desired performance. A proofof- concept design has been implemented. With the size of 147 × 112 mm2, the antenna design resonates at 2.4 GHz and 2.5 GHz. It is noted that the reflection coefficients of its circuit model yield a deviation of less than 4 dB from the actual board measurement. |
| Author(s): | K. Huat Yeap, W. Ismail, K. Ho Yeap |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1986 KB |
| Title: | Analytical Calculation of Input Impedance of Rectangular Microstrip Patch Antennas on Finite Ground Planes |
| File Type: | Conference Paper |
| Issue: | Volume: Integrated Antennas for Portable Devices Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 120 KB |
| Title: | Analysis of Transient Electromagnetic Scattering from an Overfilled Cavity Embedded in an Impedance Ground Plane |
| Abstract: | In this paper, we consider the timedomain scattering problem of a two-dimensional overfilled cavity embedded in an impedance ground plane. An artificial boundary condition is introduced on a semicircle enclosing the cavity that couples the fields from the infinite exterior domain to those fields inside. The problem is first discretized in time using the Newmark scheme, and at each time step, we derive the variational formulation for the TM polarization, and establish well-posedness. Numerical implementation of the method for both the planar and overfilled cavity models is also presented. |
| Author(s): | R. S. Callihan, A. W. Wood |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 12 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1115 KB |
| Title: | Analysis of Transient Electromagnetic Scattering from an Over lled Cavity Embedded in an Impedance Ground Plane |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 268 KB |
| Title: | Analysis of Transient Electromagnetic Scattering from an Over lled Cavity Embedded in an Impedance Ground Plane |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Finite Element Method and Applications Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 268 KB |
| Title: | Analysis of Slotted Rectangular Microstrip Antenna Using De-segmentation and PDCM Method |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 2 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 508 KB |
| Title: | Analysis of Multi-Layer Composite Cavity Using FEKO |
| Abstract: | Modeling of a large cavity containing multiple layers inside the structure has been studied using equivalent impedance approximations along with simplified single ray tracing analysis. This modeling effort investigates the effects of radiating with a source enclosed in a large vacant composite structure relative to a short wavelength. The development of the model involves the completion of a two step process. First, the heritage geometric reduction and approximation is investigated. This particular investigation involves an approach that is an application of Poynting’s Theorem. This work was performed by Hallett and Reddell at Goddard Space Flight Center in 1998. For this comparison, the Multi-Level Fast Multipole Method (MLFMM) available in the commercial tool FEKO, is used to model a generic multi-layer payload fairing (hollow cone connected to a hollow cylinder) with a radiating source to determine the resonant cavity effects within the fairing as another approximation baseline. The intent is to provide predictions for the electric field levels if a transmitter in the fairing either deliberately or unintentionally is activated. The results show a comparison with the heritage calculation and FEKO software tool. However, FEKO shows the electric field distributions within the composite fairing cavity instead of a single average value. |
| Author(s): | J. E. Stanley, D. H. Trout, S. K. Earles, I. N. Kostanic, P. F. Wahid |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 1 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 206 KB |
| Title: | Analysis of Multi-Layer Composite Cavity Using FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis VI Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 916 KB |
| Title: | Analysis of a Narrow Slot backed by a Rectangular Cavity using FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Electromagnetic Modeling by FEKO Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 187 KB |
| Title: | Analysis and Design of Cylindrical Cavity Resonators and Filters Loaded by Dielectric and Metallic Pucks with the Electric Field Integral Equation Method (EIFE) |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Integral Equation Based Techniques I Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 836 KB |
| Title: | An Optimized Microwave Absorber Geometry Based on Wedge Absorber |
| Abstract: | Low reflectivity of microwave absorbers is important to improve the performance of anechoic chamber measurements. The shape of the absorber as well as the material used are among the main components to provide desired low reflection performance. Pyramidal and wedge-shaped absorbers are two of the most wellknown microwave absorber types. We discuss the effect of a convex shape on reflection performance of microwave absorbers and show that convex shape structure has significantly performance by absorbing most of the electromagnetic energy of the incident wave. We used a concavity theorem based design method to obtain a function for a convex shape. Absorbing structures have been analyzed by using the periodic moment method (PMM). An optimization method is employed to find coefficients of the convex function, which provides better absorption performance than the wedge type absorber. Reflection performances of the wedge and convex absorbers for the 212 GHz frequency band are compared. Their reflection performances at 2 GHz for different angles of incidence are presented. An important implication of this study is that the alternative absorber shapes other than the wedge shape are demonstrated by using simple mathematical methods to have the optimal reflection characteristics. |
| Author(s): | I. Catalkaya, S. Kent |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 7 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1791 KB |
| Title: | An FDTD TF-SF Boundary on Face-Centered Cubic Grids |
| Abstract: | The implementation of total-field/scatteredfield (TF-SF) boundary for finite-difference timedomain (FDTD) method was proposed based on facecentered cubic (FCC) grids. On the basis of the arrangement of fields components in the FCC voxel, the update equations for the electric and magnetic field components of the TF-SF boundary are derived. The resonant frequency of a cavity is calculated to illustrate that the FCC grid scheme is more accurate as compared to the equivalent Yee grid method. Then, by simulating the amplitude distribution of the vertical and oblique incident plane waves in the whole calculation region, the effectiveness of the TF-SF boundary is verified numerically. |
| Author(s): | L. Shi, L. Yang, W. Feng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 4 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1805 KB |
| Title: | An Examination of the Accuracy of Integral Equation Based Modeling of the Fields within a Reverberation Chamber |
| File Type: | Conference Paper |
| Issue: | Volume: EMC in Complex Systems and Reverberant Environments Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 827 KB |
| Title: | An Estimation Method for the SLF/ELF Field Strength with L-type Horizontal Line-Current Antennas over Inhomogeneous Anisotropic Ground |
| Abstract: | In this study, the radiation characteristics of the control source of extremely low frequency (CSELF) horizontal line-current antennas are studied by the reciprocity theorem. The radiation field strength expressions of the CSELF L-type horizontal line-current antenna are derived on the basis of a field-direction coefficient in the spherical earth-ionosphere cavity. The estimation results of the super low frequency/extremely low frequency (SLF/ELF) wave are provided with regard to the conductivity, the propagation distances and the water-depth. The propagation characteristics of the CSELF wave are calculated under different conditions and are compared to Bannister’s method. The effectiveness of the proposed method is validated by a case study. |
| Author(s): | B. Li, C. Liu, H.-N. Wu, B. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1777 KB |
| Title: | An Efficient High Order Multilevel Fast Multipole Algorithm for Cavity Scattering Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: Higher Order Numerical Methods Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 448 KB |
| Title: | An Accuracy Comparison of Various Surface Integral Equations for Cavity Modeling |
| File Type: | Conference Paper |
| Issue: | Volume: Fast Integral Equation Methods and Stable Discretization Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 523 KB |
| Title: | Aircraft Resonant Cavity and Cabin Interference Coupling to a Remote Sensing, Wing-Mounted Antenna Array |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation of Electrically Large Problems Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 505 KB |
| Title: | Active Huygens’ Box: Arbitrary Synthesis of EM Waves in Metallic Cavities |
| File Type: | Conference Paper |
| Issue: | Volume: S45 Recent Advancements in the Modeling, Design and Application of Metasurfaces II Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 400 KB |
| Title: | Accurate Calculation of Capacitance for Three-dimensional Axisymmetric Conductors with Arbitrary Profile |
| File Type: | Conference Paper |
| Issue: | Volume: S10 Analytical Regularization Method (ARM) Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 339 KB |
| Title: | A Wideband Composite Cavity-Backed Modified Foursquare Antenna With Enhanced Patterns |
| File Type: | Conference Paper |
| Issue: | Volume: 5-P-1 Poster Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 589 KB |
| Title: | A Wideband Circularly Polarized GNSS Antenna for Satellite Platforms |
| File Type: | Conference Paper |
| Issue: | Volume: S46 Physically Reconfigurable Antennas and Arrays: Design, Modeling and Materials II Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 601 KB |
| Title: | A W-Band Dual-Polarization Slot Array Antenna with Low Sidelobe Level |
| Abstract: | A 94-GHz dual-polarization low-sidelobelevel slot array antenna is proposed. A 2x2-slot cavitybacked subarray is adopted as the basic unit of the array. A high-isolation orthogonal-mode transducer (OMT) with a simple structure is used to excite the dualpolarization subarray. The realization of a low sidelobe level depends on the amplitude-weighted waveguide feed network. A novel unequal power dividing ratio but equal phase (UPEP) single-ridged waveguide divider is presented for the construction of the vertical polarization (VP) array feed network. A 16x16-slot low-sidelobelevel dual-polarization array antenna is fabricated. The machining difficulties of the W-band array are reduced by using simpler structures. The measured results show that the impedance bandwidth is greater than 7.3 GHz, while the first sidelobe levels are lower than -20.1 dB for both polarization arrays within the operating bandwidth. The measured gain is higher than 30.9 dBi for the two polarization arrays with an antenna efficiency better than 64%. |
| Author(s): | H. Luo, Y. Xiao, W. Tan, L. Gan, H. Sun |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 11 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2036 KB |
| Title: | A Vector Parabolic Equation Method Combined with MLFMM for Scattering from a Cavity |
| Abstract: | The three-dimensional vector parabolic equation (PE) method was used for the fast analysis of the electromagnetic scattering with reasonable accuracy. The algorithm was marched from plane to plane along some preferred directions so that the computational load could be reduced significantly. However, large errors will be introduced for cavities with the multiple scattering. In this paper, the vector parabolic equation method combined with the multilevel fast multipole method (MLFMM) is presented for the analysis of the electromagnetic scattering from a cavity. Numerical results demonstrate that the proposed technique can efficiently give reasonably accurate results for the cavities when compared with the conventional PE method. |
| Author(s): | Z. He, Z. H. Fan, D. Z. Ding, R. S. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 5 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 352 KB |
| Title: | A Vector Generalized Finite Element-Boundary Integral Formulation |
| File Type: | Conference Paper |
| Issue: | Volume: High-Performance Finite Element Analysis in CEM Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 120 KB |
| Title: | A V-Band SIW Filter with Transmission Zero Based on High-order Mode Coupling |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-F Filters Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 348 KB |
| Title: | A Succinct Explicit Local Time-Stepping Method for Helmholtz Wave Equation Based Discontinuous Galerkin Time Domain Method for 3-D Multiscale Electromagnetic Modeling |
| Abstract: | A succinct explicit local time-stepping (LTS) method for Helmholtz wave equation based discontinue Galerkin time domain method has been developed to analyze 3-D multiscale electromagnetic problems. In the proposed LTS scheme, a simple linear interpolation procedure is implemented to calculate the fields in the subdomain with the larger mesh size at the time steps corresponding to its neighboring subdomains with the smaller mesh size, and thus the proposed method can be easily generalized to the situation of the multiple subdomains with arbitrary time step ratio. With the proposed LTS method, the computational efficiency can be improved for the analysis of the multiscale problems. Several numerical examples including dielectric loaded resonance cavity, microstrip filter, and Vivaldi antenna are given to illustrate good performance of the proposed succinct explicit LTS method. |
| Author(s): | P. Wang, Y. Shi |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 7 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2611 KB |
| Title: | A Simple Model to Compute Resonant Frequency of an Equilateral Triangular Patch Antenna Backed by Equilateral Triangular Cavity |
| File Type: | Conference Paper |
| Issue: | Volume: S38 EM Modeling and Applications - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 255 KB |
| Title: | A Novel Textured Ferrite Ground Plane for Low Profile Spiral Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using FEKO II Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 342 KB |
| Title: | A Novel Stack PCB Structure for X-band Cavity Bandpass Filter Implementation |
| File Type: | Conference Paper |
| Issue: | Volume: 4-1-C Passive/Active Microwave and Terahertz Devices Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 757 KB |
| Title: | A NOVEL SPATIAL IMAGES TECHNIQUE FOR THE ANALYSIS OF CAVITY BACKED ANTENNAS |
| Abstract: | This paper describes a new contribution to the analysis of arbitrary shielded circuits and antennas of complex shapes, in the frame of the intergal equation (IE) and Method of Moments formulation (MoM). The technique is based on the spatial image approach and a new specially truncated set of images is developed to enhance the convergance behavior of the series involved. Results show that, with the new specially truncated series of images, convergence is achieved very fast. In this paper simulated results obtained with the new approach are compared with measurments. |
| Author(s): | A.A. Melcon, J.R. Mosig, A.A. Melcon, J.R. Mosig |
| File Type: | Journal Paper |
| Issue: | Volume: 14 Number: 3 Year: 1999 |
| Download Link: | Click here to download PDF File Size: 575 KB |
| Title: | A Non-uniform Design of the metamaterial superstrate for the Resonant Cavity Antenna with Wideband Property |
| File Type: | Conference Paper |
| Issue: | Volume: S53 Antenna and Arrays IV Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 2602 KB |
| Title: | A New Shooting and Bouncing Rays Algorithm Based on Unigraphics and Its Application in Cavity Targets |
| File Type: | Conference Paper |
| Issue: | Volume: 4-4-A Time Domain Computational Mehtods II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 278 KB |
| Title: | A New Compact Quarter-mode SIW Bandpass Filter Utilising Coaxial Cavity |
| File Type: | Conference Paper |
| Issue: | Volume: 4-MP-2 Broadband and Multiband RF Circuits I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 553 KB |
| Title: | A Miniaturized Cavity backed Archemedian Spiral Antenna for mm-Wave Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 549 KB |
| Title: | A Low Profile, Broadband Linearly and Circularly Polarized Cavity Backed Antenna Using Halved-Dual Mode SIW Cavity |
| Abstract: | In this paper, a low profile single fed cavity backed slot antenna producing both linear and circular polarizations at two different frequency is presented using a halved dual mode cavity. The proposed antenna has a planar structure using a single layer of printed circuit board (PCB) which allows for integrating the antenna to other planar circuits and provides straight forward connection to SMA connector. One prototype of the antenna is designed and fabricated and very good agreement between measurement and simulation results are obtained. Results show that the proposed antenna is able to present suitable radiation characteristics as both linearly polarized (LP) antenna and circularly polarized (CP) antenna. |
| Author(s): | S. A. Razavi, M. H. Neshati |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 8 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1780 KB |
| Title: | A Low Profile and High-Performance Cavity Backed Slot Array |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-5 Microwave and Antenna Technology for Wireless Body-Centric Systems Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 784 KB |
| Title: | A Hybrid Finite Element-Boundary Integral-Characteristic Basis Function Method for Scattering by Multiple 3-D Cavities |
| Abstract: | An efficient hybrid finite elementboundary integral-characteristic basis function method (FE-BI-CBFM) is proposed to solve the problem of electromagnetic scattering by multiple three-dimensional (3-D) cavities embedded in a conducting plane. Specifically, the finite element method is used to obtain the solution of the vector wave equation inside each cavity and the boundary integral equation is applied on the apertures of all the cavities as a global boundary condition. The resultant coupling system of equations is solved by using an excitation independent characteristic basis function method. Some numerical results are included to illustrate the validity and capability of the proposed method. |
| Author(s): | Z. Cui, Y. Han |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 6 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 458 KB |
| Title: | A Green\'s Function Solution to Helmholtz Equation with Impedance Boundary Conditions |
| File Type: | Conference Paper |
| Issue: | Volume: Mathematical Aspects of CEM Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 241 KB |
| Title: | A Diplexer based on Hybrid Cavity and Microstrip Structure |
| Abstract: | This paper presents a high selective diplexer with hybrid filters, which is composed by dual-mode microstrip resonators with metallic coaxial shielding cases of RF module. By utilizing vertical space above microstrip circuits which greatly saves space, an additional pair of transmission pole and zero are hereby added in the passband and stopband, respectively. The proposed structure provides high quality-factors to enhance frequency selectivity. For demonstration, a diplexer prototype is designed and fabricated at the center frequencies (CF) of 2.40 and 3.45 GHz with a 3-dB passband bandwidth of 200 MHz. The measured insertion losses (IL) are 1.45 dB and 1.61 dB in the lower and upper passbands respectively. The output isolation between two channels is measured greater than 32 dB. |
| Author(s): | J. Shu, Y. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 10 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1582 KB |
| Title: | A Compact Size Dual-Polarized High-Gain Resonant Cavity Antenna at 28 GHz |
| File Type: | Conference Paper |
| Issue: | Volume: 2-P2-D Miniaturized Antennas and Arrays Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 215 KB |
| Title: | A Compact Cavity-Backed Dipole Design Using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using Wipl-D Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 364 KB |
| Title: | Where does the radiation come from? |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Session 1 Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 89 KB |
| Title: | Using Logo-Antenna Based RFID Tags forAdvertising |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling of RFID Devices and Systems Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 548 KB |
| Title: | Using Logo-Antenna Based RFID Tags for Advertising |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition I Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 548 KB |
| Title: | Using FEKO for Electromagnetic Analysis of Carbon-Fiber Composite Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 348 KB |
| Title: | Using Electromagnetic Band Gap (EBG) Superstrate Layer to Enhance the Bandwidth and Gain of a Dual Band Microstrip Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Metamaterial Structures with Application to Guided-Wave Electromagnetics and Antennas Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 182 KB |
| Title: | Using Antenna Measurements in Numerical Solutions |
| File Type: | Conference Paper |
| Issue: | Volume: S16 EM Modeling using FEKO Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 300 KB |
| Title: | Using Adaptive Estimation to Minimize the Number of Samples Needed to Develop a Pattern to a Specified Uncertainty |
| Abstract: | Obtaining far-field patterns in electromagnetics or acoustics, although generally not as computationally expensive as solving for the sources induced on an object, can none-the-less at times be a substantial fraction of the overall computer time associated with some problems. This can be especially the case in determining the monostatic radar cross section of large objects, since the current distribution must be computed for each incidence angle or when using physical optics to determine the radiation patterns of large reflector antennas. In addition, when employing the point sampling and linear interpolation of the far field that is most often used to develop such patterns, it can be necessary to sample very finely in angle to avoid missing fine details such as nulls. A procedure based on model-based parameter estimation is described here that offers the opportunity of reducing the number of samples needed while developing an easily computed and continuous representation of the pattern. It employs windowed, low-order, overlapping fitting models whose parameters are estimated from the sparsely sampled far-field values. The fitting models themselves employ either discrete-source approximations to the radiating currents or Fourier models of the far field. For the cases investigated, as few as 1.5 to 2 samples per far-field lobe are found to be sufficient to develop a radiation-pattern estimate that is accurate to 0.1 dB, and 2.5 samples per lobe for a simple scatterer. In general, however, the sampling density is not determined by the lobe count alone, but by the effective rank of the field over the observation window, which in turn is a function of both the aperture size and the spatial variation of the source distribution within that aperture. |
| Author(s): | Edmund K. Miller, Edmund K. Miller |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 3 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 278 KB |
| Title: | Using a Radial, Switchable, Sector Ground Screen to Produce Azimuthal Directivity for a Monopole Antenna |
| Abstract: | Ground-mounted monopole antennas are usually driven against a radial-wire ground system to control their input impedance and to improve their radiation efficiency. This results in a radiation pattern that is uniform in azimuth angle with a front-to-back ratio of 1, or 0 dB. The use of a sectorial ground screen, one whose radial or angular extent is varied to produce a radiation pattern having azimuthal directivity has received some attention. An alternate approach also is explored in this discussion. It involves exploring the effect of varying the number of “active” radials in an otherwise uniform ground system of radial wires, an active radial being one that is electrically connected to the base of the monopole. A “passive” radial on the other hand is one that is separated from the monopole by a switch. By varying the number and angular locations of the active and passive ground wires, the resulting azimuth pattern can be varied in angle and directive gain. This arrangement makes possible a steerable pattern, something not usually associated with ground-mounted monopoles. The antenna and ground screen are modeled using the well-known NEC package. For convenience in modeling, active radials are made into passive ones by adding a large resistance between the base of the monopole and a given radial. Directive gains of more than 5 dB are found to be possible. |
| Author(s): | E. K. Miller |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 11 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1549 KB |
| Title: | User’s Hand Effects on Built-in L-shaped Folded Monopole Antenna for Mobile Handsets |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling and Small Antennas Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 1367 KB |
| Title: | USE OF A STEALTH BOUNDARY WITH FINITE DIFFERENCE FREQUENCY DOMAIN SIMULATIONS OF SIMPLE ANTENNA PROBLEMS |
| Abstract: | A direct method for the numerical solution of Maxwell's equations in the frequency domain (sinusoidal steady state), for radiation problems of cylindrical symmetry, is incorporated into a finite difference program called HERZ, coded in FORTRAN. The termination of the fields on the outer boundary of the problem domain is accomplished via an absorptive layer, labelled a stealth layer, which attenuates the incident fields to insignificant amounts in a small computing space, without causing significant reflections that would disturb the near field solutions. No radiation boundary condition is specified on the problem domain, rather, the transmission of the fields to the stealth layer is optimized by specifying its electrical properties. To validate HERZ as a useful electromagnetic modeller for thin wire antennas, driving point admittances and surface current distributions for several configurations were compared to both theoretical and measured values, with good agreement. [Vol. 9, No. 1 (1994), pp 78-87] |
| Author(s): | R.B. Thompson, F.S. Chute, F.E. Vermeulen, R.B. Thompson, F.S. Chute, F.E. Vermeulen |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 1 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 794 KB |
| Title: | USCG 270\' Cutter - NVIS Antenna Study |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Applications for the DoD Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 683 KB |
| Title: | USCG 270\' Cutter - NVIS Antenna Study |
| File Type: | Conference Paper |
| Issue: | Volume: Practical Applications of Method of Moments Modeling Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 870 KB |
| Title: | Uniform Theory of Diffraction Approximation for Large Antenna Array Fields |
| File Type: | Conference Paper |
| Issue: | Volume: S36 Antenna Design II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 503 KB |
| Title: | Uniform Circular Array Active Element Radiation Patterns, FEKO Predictions Vs. Measurements |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO – I Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 234 KB |
| Title: | Ungrounded Lightning Surge Protection Device for Wireless Sensor Networks Node in the Wilderness |
| Abstract: | In the wilderness, the use of wireless sensor network (WSN) nodes because of their maintenance-free remote-monitoring characteristic demands ungrounded lightning surge protection. This paper proposes a design of a protection device with functions of low-frequency surge cutting off and radio-frequency (RF) signal passing. In this device, the discharge circuit consists of a threelevel surge by-pass circuit, an outer conductor antenna, and a copper-clad circuit board. The current capacity, start time, and output voltage meet the requirements of surge protection for a weak current device. Discrete components that provide the protective feature were involved in calculating impedance matching, and the parameters of these components were estimated and adjusted constantly at the test stage to ensure that the impedance of the inserted protection device matches with those of the node RF transceiver module and antenna. The experimental results show that the node with the ungrounded protection device can pass fourth-level surge immunity experiments and run for 49 months at the outdoor monitoring site in the Xinjiang coal fire area. |
| Author(s): | Q. Cao, L. Yang, S. Yan |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1412 KB |
| Title: | Understanding the Electromagnetic Characteristics of Real Metamaterials via Rigorous Field Simulation |
| File Type: | Conference Paper |
| Issue: | Volume: Metamaterial Structures with Application to Guided-Wave Electromagnetics and Antennas Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 172 KB |
| Title: | Undergraduate Student Antenna Design Projects Using Sonnet |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 443 KB |
| Title: | Unconventional Array for 5G Scenario: Irregular Clustering Antenna Design and Implementation |
| File Type: | Conference Paper |
| Issue: | Volume: 8-TP-5 Unconventional Array Analysis and Synthesis for New Generation Communications and Sensing Systems I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 283 KB |
| Title: | Unconventional Array for 5G Scenario: Irregular Clustering Antenna Design and Implementation |
| File Type: | Conference Paper |
| Issue: | Volume: 10-TE-5 Unconventional Array Analysis and Synthesis for New Generation Communications and Sensing Systems II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 283 KB |
| Title: | Uncertain Material Parameter Extraction using FEKO Optimizations for Space Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S05 EM Modeling Using Feko - I Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 259 KB |
| Title: | Ultrawideband Printed Elliptical Monopole Antenna With Four Band- Notch Characteristics |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling, Simulation, and Validation Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 150 KB |
| Title: | Ultrawideband Antipodal Vivaldi Antenna for Road Surface Scanner Based on Inverse Scattering |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 311 KB |
| Title: | Ultra-wideband Triple-Ellipse Inverted-Hat Antenna for Aircraft Communications |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis I Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 244 KB |
| Title: | Ultra-Wideband Reflectarray with Multi-Resonance Elements |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-B Millimeter Wave and Terahertz Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 287 KB |
| Title: | Ultra-Wideband Modified CSRR Antenna with Reconfigurable Notch Band |
| Abstract: | A novel technique of realizing notches for a compact ultra-wideband (UWB) antenna is proposed based on a modified complementary split ring resonator (CSRR). The UWB slot antenna is in the swallow shape of a modified CSRR. The notched band centered at 5.8 GHz for upper WLAN and 3.9 GHz for C-band satellite communication systems. The proposed antenna has a compact size of 25 × 27.9 mm2. The measured results show that the proposed antenna can guarantee a wide bandwidth from 2 GHz to 12 GHz (VSWR < 2) with dual unwanted bandnotches successfully. The antenna demonstrates omnidirectional and stable radiation patterns across all the relevant bands. Moreover, a prototype of the dual-band-notched UWB antenna is fabricated and measured results are compared with simulated results. |
| Author(s): | D. Jiang, B. Yan, R. Xu |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 7 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1496 KB |
| Title: | Ultra-Wideband Microstrip Antenna for Body Centric Communications |
| Abstract: | A novel low profile reconfigurable wide band microstrip antenna for impulse radio ultra-wideband (IR-UWB) WBANs and targeted for on-body sensor node has been introduced. The printed monopole antenna consists of a heart shaped radiating patch and an elliptical ground plane. This antenna has a frequency bandwidth of 130% with a VSWR of 1.5 and average gain is about 3.6 dBi. There is a slot on the patch which is loaded by two varactor diodes to form a tunable notch band. The antenna operates from 2.4 GHz to 12 GHz. The proposed antenna is a good candidate for medical purpose since it has a sufficient amount of gain and bandwidth. We used active circuit to increase the flexibility of setting rejection band to prevent having interference from other sources such as Wi-Fi. The antenna is fabricated and there is a good agreement between the simulation and measurement results. |
| Author(s): | A. Darvazehban, T. Rezaee |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 9 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1530 KB |
| Title: | Ultra-Wideband Microstrip Antenna for Body Centric Communications |
| Abstract: | A novel low profile reconfigurable wide band microstrip antenna for impulse radio ultra-wideband (IRUWB) WBANs and targeted for on-body sensor node has been introduced. The printed monopole antenna consists of a heart shaped radiating patch and an elliptical ground plane. This antenna has a frequency bandwidth of 130% with a VSWR of 1.5 and average gain is about 3.6 dBi. There is a slot on the patch which is loaded by two varactor diodes to form a tunable notch band. The antenna operates from 2.4 GHz to 12 GHz. The proposed antenna is a good candidate for medical purpose since it has a sufficient amount of gain and bandwidth. We used active circuit to increase the flexibility of setting rejection band to prevent having interference from other sources such as Wi-Fi. The antenna is fabricated and there is a good agreement between the simulation and measurement results. |
| Author(s): | A. Darvazehban, T. Rezaee |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1815 KB |
| Title: | Ultra-Wideband Microstrip Antenna for Body Centric Communications |
| Abstract: | A novel low profile reconfigurable wide band microstrip antenna for impulse radio ultra-wideband (IRUWB) WBANs and targeted for on-body sensor node has been introduced. The printed monopole antenna consists of a heart shaped radiating patch and an elliptical ground plane. This antenna has a frequency bandwidth of 130% with a VSWR of 1.5 and average gain is about 3.6 dBi. There is a slot on the patch which is loaded by two varactor diodes to form a tunable notch band. The antenna operates from 2.4 GHz to 12 GHz. The proposed antenna is a good candidate for medical purpose since it has a sufficient amount of gain and bandwidth. We used active circuit to increase the flexibility of setting rejection band to prevent having interference from other sources such as Wi-Fi. The antenna is fabricated and there is a good agreement between the simulation and measurement results. |
| Author(s): | A. Darvazehban, T. Rezaee |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1815 KB |
| Title: | Ultra-Wideband Antenna with Variable Notch Band Function by Defected Ground Structure and Shorting Pin |
| Abstract: | In this paper, a simple miniaturized printed antenna for ultra-wideband applications with variable band-notch function is proposed. The presented antenna consists of a square radiating patch and a ground plane with inverted T-shaped slot, which increases the bandwidth of 2.3-11 GHz. Frequency band-stop performance is created by two techniques: Defected Ground Structure (DGS) and shorting pins. The designed antenna has a small size of 17×21×1 mm3 , while showing the band rejection performance in the frequency bands of 3.2 to 3.8 and 5.1 to 5.85 GHz, respectively. |
| Author(s): | M. Akbari, R. Movahedinia, A. Sebak |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 6 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 1177 KB |
| Title: | Ultra-Wideband Antenna with Variable Notch Band Function by Defected Ground Structure and Shorting Pin |
| Abstract: | In this paper, a simple miniaturized printed antenna for ultra-wideband applications with variable band-notch function is proposed. The presented antenna consists of a square radiating patch and a ground plane with inverted T-shaped slot which increases the bandwidth of 2.3–11 GHz. Frequency band-stop performance is created by two techniques: Defected Ground Structure (DGS) and shorting pins. The designed antenna has a small size of 17×21×1 mm3 while showing the band rejection performance in the frequency bands of 3.2 to 3.8 and 5.1 to 5.85 GHz, respectively |
| Author(s): | M. Akbari, S. Zarbakhsh, R. Movahedinia, A. Sebak |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 4 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 803 KB |
| Title: | Ultra-wideband and Polarization-insensitive RCS Reduction of Microstrip Antenna using Polarization Conversion Metasurface |
| Abstract: | A new type of polarization conversion metasurface (PCM) is presented to reduce radar cross section (RCS) of microstrip antenna. The proposed PCM consists of evolved split ring (ESR) resonators. Through designing of the PCM unit cell with five resonances and symmetrical layout, a high polarization conversion ratio and ultra-wideband passive cancellation are achieved. The proposed antenna (with PCM) and a reference antenna are designed, simulated and measured. The measured results show that our proposed antenna can achieve 10 dB in-band and 5 dB out-of-band RCS reduction in an ultra-wide frequency band from 6 GHz to 26.7 GHz. Moreover, the PCM works efficiently for both x- and y-polarized incident waves. The measured results show a good agreement with the simulations. Compared to previous researches, the proposed PCM features a compact profile and wider operating bandwidth of RCS reduction. |
| Author(s): | J. Su, C. Kong, Z. Li, X. Yuan, Y. L. Yang |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 6 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2304 KB |
| Title: | Ultra-wideband All-Metal Vivaldi Phased Array Antenna with Metal Baffles |
| File Type: | Conference Paper |
| Issue: | Volume: 3-MA-1 Advances in Phased Array Architectures and Beamforming Technology Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 155 KB |
| Title: | Ultra-Wide Bandwidth Enhancement of Single-Layer Single-Feed Patch Antenna Using the Theory of Characteristic Modes |
| Abstract: | The Theory of Characteristic Modes (TCM) is proposed as a systematic approach to antenna design to achieve the goal of finding the antenna structure with optimum broadband behavior. This theory provides a physical insight to the radiating nature of microstrip patch antennas and reduces the design optimization time. In this work, the resonant behavior of the highly radiating structure of the single U-slot rectangular patch on a single-layer ?r = 4.4 substrate is analyzed using TCM. Modal analysis of this single-layer structure with different single feed excitations concludes that VSWR ? 2 impedance bandwidth in the order of 96% can be achieved with a single T-probe feed. Experimental results, included here, show VSWR ? 2 impedance bandwidth in the order of 71%. |
| Author(s): | M. M. Elsewe, D. Chatterjee |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 9 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1411 KB |
| Title: | Ultra-Wide Bandwidth Enhancement of Single-Layer Single-Feed Patch Antenna Using the Theory of Characteristic Modes |
| Abstract: | The Theory of Characteristic Modes (TCM) is proposed as a systematic approach to antenna design to achieve the goal of finding the antenna structure with optimum broadband behavior. This theory provides a physical insight to the radiating nature of microstrip patch antennas and reduces the design optimization time. In this work, the resonant behavior of the highly radiating structure of the single U-slot rectangular patch on a single-layer epsilon r = 4.4 substrate is analyzed using TCM. Modal analysis of this single-layer structure with different single feed excitations concludes that VSWR less than or equal to 2 impedance bandwidth in the order of 96% can be achieved with a single T-probe feed. Experimental results, included here, show VSWR less than or equal to 2 impedance bandwidth in the order of 71%. |
| Author(s): | M. M. Elsewe, D. Chatterjee |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1705 KB |
| Title: | Ultra-Wide Bandwidth Enhancement of Single-Layer Single-Feed Patch Antenna Using the Theory of Characteristic Modes |
| Abstract: | The Theory of Characteristic Modes (TCM) is proposed as a systematic approach to antenna design to achieve the goal of finding the antenna structure with optimum broadband behavior. This theory provides a physical insight to the radiating nature of microstrip patch antennas and reduces the design optimization time. In this work, the resonant behavior of the highly radiating structure of the single U-slot rectangular patch on a single-layer epsilon r = 4.4 substrate is analyzed using TCM. Modal analysis of this single-layer structure with different single feed excitations concludes that VSWR less than or equal to 2 impedance bandwidth in the order of 96% can be achieved with a single T-probe feed. Experimental results, included here, show VSWR less than or equal to 2 impedance bandwidth in the order of 71%. |
| Author(s): | M. M. Elsewe, D. Chatterjee |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1705 KB |
| Title: | Ultra-Thin Artificial Magnetic Conductor with Metallic Posts for a 94 GHz On-chip Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 259 KB |
| Title: | Ultra Wideband Antenna Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D software II Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 348 KB |
| Title: | Ultra Wide-Band Electromagnetic Interference (EMI) Reduction from Printed Circuit Boards (PCB) |
| File Type: | Conference Paper |
| Issue: | Volume: Black Box Modeling Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 362 KB |
| Title: | Ultra Low profile, Unbalanced Fed Inverted F Antenna on Finite Conducting Plane |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using WIPL-D Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 545 KB |
| Title: | Ultra Low Profile Inverted L Antenna on Parallel Wires |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using WIPL-D Characterization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 126 KB |
| Title: | UHF-HF RFID Integrated Transponder for Moving Vehicle Identification |
| Abstract: | This paper presents a passive HF-UHF RFID integrated transponder for the identification of a moving vehicle. It consists of a single ISO 7810 ID-1 Card where both a UHF meander dipole antenna and an ISO 15693 commercial tag are arranged. The UHF antenna is designed by using a parametric analysis of the optimal shape of the meanders to obtain a proper conjugate matching between the antenna and the RFID microchip. A single-lane identification scenario is presented and simulated. The effects of the electromagnetic reflection and diffraction on the reading range as well as on the identification operations of a tagged vehicle are also investigated. Numerical simulations and experimental results on a prototype of the conduced transponder confirm the possibility of using this technology for the identification of a moving vehicle approaching a road-toll system with a relatively slow speed. |
| Author(s): | A. Toccafondi, C. D. Giovampaola, P. Braconi, A. Cucini |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 6 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 11189 KB |
| Title: | UHF Flared Notch Antenna Design for Linear Arrays |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D software II Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 857 KB |
| Title: | Two-Element T-Array for Cross-Polarized Breast Tumor Detection |
| Abstract: | This paper reports on a computational study of a 2-element cross-polarized antenna array for breast cancer detection. The “Dark Eyes” antenna is used in a T-arrangement to form the array. The antenna return loss is below -10dB in the range 2.3-10.3 GHz and the cross-polarized mutual coupling is less than -30dB for frequencies over 2.4 GHz. Using the finite-difference time-domain (FDTD) method, an ultra-wideband (UWB) pulse is transmitted in the numerical breast phantom and the co- and cross-polarized back-scatter response is recorded from tumors at different locations. The breast phantom was modeled as a simple layered medium of skin and fat. The dispersive properties of layers were introduced through a Debye model. Simulation results for a spherical and a cylindrical tumor of different orientations are presented and discussed. |
| Author(s): | H. Kanj, M. Popovic, H. Kanj, M. Popovic |
| File Type: | Journal Paper |
| Issue: | Volume: 23 Number: 3 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 3879 KB |
| Title: | Two-Element T-Array for Cross-Polarized Breast Tumor Detection |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling of Biomedical Problems - 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 375 KB |
| Title: | Two-dimensional DOA Estimation with Reduced-dimension MUSIC Algorithm |
| File Type: | Conference Paper |
| Issue: | Volume: 4-2-B Space and Satellite Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 222 KB |
| Title: | TWO WIRE RHOMBIC ILLUMINATOR PERFORMANCE AS PREDICTED BY THEORETICAL AND NUMERICAL MODELS |
| Abstract: | The two wire rhombic illuminator (RI) is a rhombic wire antenna located over a ground plane which is used to generate near uniform electromagnetic fields over a specified working volume located below the antenna. The RI can be modeled as a simple two-wire transmission line at low frequencies but the transmission line model becomes inadequate at higher frequencies due to the enhanced radiation properties of the antenna. The performance of the RI including radiation effects is evaluated numerically using the Numerical Electromagnetics Code (NEC-2) and compared to that of the transmission line model. The antenna in the presence of a perfectly conducting ground plane is analyzed at frequencies ranging from 1 MHz to 500 MHz. Various segmentation schemes are utilized in order to accurately predict the performance of the RI at frequencies where the dimensions of the structure are very large in terms of wavelength. [Vol. 9, No. 1 (1994), pp 88- 101] |
| Author(s): | J. Patrick Donohoe, Saad N. Tabet, C.D. Taylor, J. Patrick Donohoe, Saad N. Tabet, C.D. Taylor |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 1 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 782 KB |
| Title: | Two Microstrip Patch Antenna Designs Exhibiting Tri-Resonance with Enhanced Gain |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 634 KB |
| Title: | Two Element UWB-MIMO Antenna with Modified Ground Stub Structure |
| File Type: | Conference Paper |
| Issue: | Volume: S12 Advanced Optimization of Electromagnetic Structures - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 431 KB |
| Title: | Two Element Phased Array Dipole Antenna on Finite EBG Ground Plane |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D Software Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 171 KB |
| Title: | Two Element Phased Array Dipole Antenna |
| Abstract: | Two element array of dipole antennas with 90 degree phase difference feed is proposed for directional antenna applications. In the numerical analysis, the electromagnetic simulator WIPL-D based on the method of moment is used. At first, the distance between the two elements is fixed to be a quarter wavelengths at the design frequency of 2.45 GHz. The front-to-back ratio is calculated. Then, by adjusting the length of the two elements and the distance between the two elements, a front-to-back ratio of 15.3 dB is obtained. The relation between the front-to-back ratio of this antenna and the feed point currents is discussed. The measured input impedance with 90 degree hybrid |
| Author(s): | Mitsuo Taguchi, Kotaro Era, Kazumasa Tanaka, Mitsuo Taguchi, Kotaro Era, Kazumasa Tanaka |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 1 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 272 KB |
| Title: | Two Element Phased Array Dipole Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D Software Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 237 KB |
| Title: | Two Element Dielectric Resonator Antenna with Beam Switching |
| Abstract: | A wideband two element rectangular dielectric resonator antenna (DRA) is proposed in this paper. Each DRA element has two excitation strips and four parasitic patches. A wide impedance bandwidth of more than 37% at the center frequency of 1.6 GHz is achieved. The antenna radiation beam can be switched between two positions in elevation plane, i.e., θ = 45° and θ = -45°. The measured antenna gain is found to be more than 6 dB in the whole frequency band of operation. The matching and the radiation characteristics of the designed switched beam antenna are studied and validated by measurements. A very good agreement between the measured and simulated results is observed. |
| Author(s): | M. K. Saleem, M. A. S. Alkanhal, A. F. Sheta |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1547 KB |
| Title: | Two Arm Archimedean Spiral Helical Antenna with Wrap Around Absorber |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis IV Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 334 KB |
| Title: | Two Arm Archimedean Spiral Helical Antenna With Wrap Around Absorber |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition II Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 334 KB |
| Title: | Tuning the Resonant Frequency of Microstrip Patch Antenna in LWIR |
| File Type: | Conference Paper |
| Issue: | Volume: S05 Microwave/Millimeter Wave and Terahertz Devices and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 206 KB |
| Title: | Tunable Band-Notched UWB Antenna from WLAN to WiMAX with Open Loop Resonators using Lumped Capacitors |
| Abstract: | The proposed antenna in this paper is compact UWB monopole antenna with a rectangular patch consists of stepped cuts and triangular slot. A two open loop resonators are designed and added near microstrip feed line to achieve sufficient band rejection from 5.1 GHz to 6.5 GHz for avoiding interference with WLAN frequency bands. The proposed antenna has low profile and compact size, its size equals 3.2 x 3.2 cm2. It has bandwidth from 3.1 GHz to 19.3 GHz with voltage standing wave ratio (VSWR) < 2, except the undesired band of 5.1–6.5 GHz. Two-lumped capacitors are inserted in order to investigate the ability of tuning the resonance frequency of the band-notched structures from 5.6 GHz to 3.5 GHz. Finally, the layout of the proposed UWB monopole antenna with the notched band is experimentally fabricated and measured to verify the simulation results. Furthermore, the return loss and far-field measurements of the fabricated antenna exhibit good match with simulation predictions. |
| Author(s): | W. A. E. Ali, A. A. Ibrahim |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 6 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2018 KB |
| Title: | Triple-Band Microstripline-Fed Printed Wide-Slot Antenna for WiMAX/WLAN Operations |
| Abstract: | A novel triple-band microstrip antenna design is introduced for WiMAX/WLAN applications. The proposed antenna has a moderate size of 38×39×0.79 mm3 , yet offers quite well gain performance (5.6-8 dBi) over the operational bands. The antenna consists of a microstrip feedline coupled to a pair of concentric rectangular loops, as well as a split-ring element inserted within a slotted ground plane, which may also be considered as a wide-slot antenna element. In the paper, the numerical antenna design along with the corresponding measurement results is presented. An equivalent circuit modeling of the proposed design along with empirical formulae relating antenna parameters with notch frequencies is also introduced to serve as a useful design guideline. |
| Author(s): | M. H. B. Ucar, Y. E. Erdemli |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 10 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 674 KB |
| Title: | Triple Bands UWB Antenna with Minimum Printed Area for Power Harvesting Applications |
| Abstract: | In this paper, a triple-band ultra-wideband UWB eight elements monopole antenna array is proposed. This antenna array is designed with the minimum printed area and is prepared for wireless local area network (WLANs) power harvesting applications. It covers the bands of 2.4 GHz and 5 GHz, which makes it suitable for Wi-Fi frequencies to harvest their power. The eight-element antenna array dimensions are 28.5 cm by 15 cm. These dimensions are chosen for the mini-solar cell integration process. Low-cost FR4 material is used as a substrate. The proposed antenna’s measured reflection coefficient is compared with its simulated counterpart and is founded in good harmony. |
| Author(s): | N. D. Sehsah, T. G. Abouelnaga, H. A. Elmikati |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 5 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3645 KB |
| Title: | Triangular Ring Patch Antenna Analysis: Neuro-Fuzzy Model for Estimating of the Operating Frequency |
| Abstract: | In this study, a neuro-fuzzy (NF) analysis method is suggested for the estimation of the operating frequency of triangular ring patch antennas (TRPAs) that operate at ultra high band applications. Although the analysis of regular-shaped patch antennas (PAs) such as rectangular, triangle, and circle is easy, analysis of irregularly shaped patch antennas is difficult and time consuming. Here, this great effort and time has been eliminated by using an artificial intelligence technique such as NF. To create a data set for NF, 100 TRPAs with different physical and electrical properties (L, l, h, and er) are simulated by using an electromagnetic simulator program. The currency and accuracy of the proposed approach is then confirmed on the measurement results of a prototype TRPA fabricated in this study. The results of NF model are compared with the simulation/ measurement results and previously the method published in the literature. |
| Author(s): | A. Kayabasi |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 11 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 4601 KB |
| Title: | Triangular Patch Yagi Antenna with Reconfigurable Pattern Characteristics |
| Abstract: | A pattern reconfigurable Yagi patch antenna is proposed. The antenna is composed of three triangular microstrip patches, i.e., one driven patch and two parasitic patches. By controlling switches, which are installed on the parasitic patches, the radiation pattern of the antenna can point to three different directions, covering an elevation range from -61° to +63° in the E-plane. The simulated and measured results are presented and they agree with each other in reasonable precision. |
| Author(s): | J. Zhang, X. S. Yang, J. L. Li, B. Z. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 11 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 899 KB |
| Title: | Transparent Flexible Antenna for UWB Applications |
| Abstract: | In this paper, a flexible circular slot transparent antenna which can be used in ultra wideband applications is presented. A CPW-fed circular disc monopole is used to excite the circular slot aperture. The antenna is designed and fabricated using ITO coated on a flexible Polyethylene Terephthalate (PET) substrate. It can operate with different curvature angles at UWB frequencies with 125% bandwidth. Simulation and measurement results show that the radiation pattern does not change if the antenna is being rolled, and also confirm its effective performance as a flexible transparent antenna with low profile. |
| Author(s): | M. R. Haraty, M. Naser-Moghadasi, A. A. Lotfi-Neyestanak, A. Nikfarjam |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 12 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1773 KB |
| Title: | Transparent Circular Monopole Antenna for Automotive Communication |
| Abstract: | A novel fractal shaped antenna on transparent material is communicated in this article. The proposed antenna is flexible and conformal on the automotive surface to serve at vehicular communication applications. Polyvinyl chloride substrate material of ɛr=3 and loss tangent 0.02 is used in the antenna design with overall dimension of 55 x 40 x 3 mm. The virtual placement of the antenna on vehicular surface is simulated with the combination of ANSYS HFSS and Savant tools. Far-field radiation and the Electric-field distribution with respect to the antenna placement on vehicular structure is analyzed and presented in this work. The prototyped antenna measurements are in good agreement with the simulation. |
| Author(s): | S. Bandi, D. K. Nayak, B. T. P. Madhav, A. Tirunagari |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1671 KB |
| Title: | Transmitting Power Handling Limitations of a Wideband, Non-Foster Electrically-Small Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S60 Mobile and Small Antennas II Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 436 KB |
| Title: | Transient Responses of Broadband Low Profile Filter-Antenna Under Impact of an EMP |
| File Type: | Conference Paper |
| Issue: | Volume: 10-TE-1 Electromagnetic Environment Effects and Protection II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1071 KB |
| Title: | Transient Analysis of Thin-Wire Antennas over Debye Media |
| Abstract: | This paper presents a numerical procedure to calculate the time-domain response of thin-wire antennas over Debye media. The method is based in an expansion of the electricfield integral-equation in the time-domain (EFIETD), which accounts for the Debye media by using a reflection-coefficient approach. Resulting extended integral equation is subsequently solved by the method of moments. Numerical examples including Debye soils show not only the accuracy of the method but also a higher computational efficiency in comparison with other hybrid numerical techniques. |
| Author(s): | M. F. Pantoja, A. R. Bretones, S. G. García, X. L. Travassos, R. G. Martín |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1010 KB |
| Title: | Train-mounted Broadband Monopole Antenna for 5G Communication |
| Abstract: | As a convenient and efficient public transport system, high speed railway (HSR) was rapidly deployed in China. Since the fifth generation (5G) mobile communication system is commercially applied, it is necessary for mobile terminals antennas to cover multiple operating bands to be compatible with various communication systems. Here a HSR-mounted broadband and high-gain monopole antenna is proposed. By using the meander technology and introducing the tapered structure, the proposed antenna operates over a bandwidth of 694-960 MHz and 1350-5975 MHz (VSWR<1.8), which covers both 2G-5G mobile communication and WiFi frequency bands. The dimensions of the proposed antenna are 400 mm × 330 mm × 78 mm. The measured average gain is 6.11 dBi over the entire bandwidth. |
| Author(s): | H. X. Li, L. Xu, F. Qian, Y. J. Zhou |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 7 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1444 KB |
| Title: | Topology Optimization of Microstrip Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: 3-3-A Applications of Evolutionary Algorithms in Electromagnetics Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 400 KB |
| Title: | Time-Domain Response of 3-D Structures Calculated Using WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D Software Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 647 KB |
| Title: | Time Domain Analysis of a Microstrip Line Excited Compact Rectangular Dielectric Resonator Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: FDTD and Applications Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 76 KB |
| Title: | THz Microstrip Antenna for Terabit Wireless Local Area Networks |
| Abstract: | In order to replace millimetre wave communication for extremely fast terabit wireless local and personal area network connectivity, researchers have been looking into the possibilities of the terahertz band for establishing wireless data communication at terabit rates. The IEEE 802.15 WPAN Terahertz Interest Group (IGTHz) has been created to encourage research in the terahertz bands and set standards for their use, in order to facilitate progress and advancement in this area. The specific objective of this study is to design and analyze a microstrip antenna working at 3.5 THz resonant frequency. The proposed novel antenna includes three layers: a top layer that represents the patch, a second layer that represents the substrate, and a bottom layer that represents the ground plane. It is designed using a 32 nm thin FR-4 substrate with a permittivity of 4.4. Using HFSS simulations, it was found that the proposed antenna has an overall efficiency greater than 85% within the working frequency range of 3.5 THz. Additionally, it exhibited an extremely low reflection coefficient (S11) of -43.61 dB at 3.5 THz, with an efficiency exceeding 80%. This simple and broadband antenna design could have relevance in high-speed data transmission networks. |
| Author(s): | V. Koushick, C. Divya, M. Vinoth, E. A. Mohamed Ali, M. Sugadev |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 5268 KB |
| Title: | Through Wall Gap Detection Using Monostatic Radar |
| Abstract: | In this paper, a new experimental system for through wall gap detection and concealed vacancies behind wall is introduced. The ultra wide band (UWB) system is based on the principles of time domain reflectometry (TDR) and ground-penetrating radar (GPR) for through wall imaging to detect hidden gaps and/or hiding persons behind walls. The system uses a very short pulse generated by the vector network analyzer (VNA) to illuminate the wall under investigation through an UWB antenna probe. The detection process is achieved using time domain measurements of the probe reflection coefficient S11. Some numerical analyses have been carried out for verifying the principle of operation. The experimental results show a great ability not only for the gap detection between walls but also for estimation of the gap width with a very good accuracy (6.25 % in the worst case) for different types of walls. |
| Author(s): | A. Elboushi, A. R. Sebak, T. Denidni |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 5 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 495 KB |
| Title: | Three-Stacked Dielectric Ring Resonator Loaded Hybrid Monopole Antenna for Improved Ultrawide Bandwidth |
| Abstract: | In this paper, a new wideband and compact three-segment composite dielectric ring resonator (DRR) antenna excited by an axi-symmetric coaxial monopole has been introduced. The proposed antenna has been investigated numerically and experimentally for enhanced impedance bandwidth. At the lowest operating frequency, the presented antenna has a footprint area of just 0.16λ0 x 0.16λ0. According to the measurement results, the antenna offers a fractional impedance bandwidth equal to 159% with 8dBi peak gain. The antenna provides symmetrical and stable monopole like radiation pattern over the entire impedance bandwidth. With such performance, the suggested antenna can be usefully employed in different wideband applications such as electromagnetic interference (EMI) and defense applications. |
| Author(s): | A. A. Al-Azza, N. A. Malalla, M. M. Morsy, F. J. Harackiewicz |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21794 KB |
| Title: | Three-Dimensional Radar Cross Section Patterns of Volumetrically-Distributed Random Antenna Arrays |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Antenna Arrays and Applications Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 738 KB |
| Title: | Three-dimensional ISAR Imaging Based on Amplitude and Phase Errors Correction |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-E Synthetic Aperture Radar Techniques and Applications II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 167 KB |
| Title: | Three different ways to decorrelate two closely spaced monopoles for MIMO applications |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Recent Electromagnetics & Antennas Activities in the European Network "ACE" Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 409 KB |
| Title: | Theoretical Approach for the Design of a New Wideband Ku-band Printed Antenna |
| Abstract: | A design of a broadband Ku-band low-cost printed circuit board technology (PCB) antenna is presented in this paper. An approach was developed to enhance the bandwidth of a simple printed patch antenna. The proposed method is, step by step, detailed to discuss the evolution of the antenna geometry and depicts the contribution of the imported changes on the properties achieved each time. A 22% relative bandwidth in Ku-band was obtained for a footprint of 0.4?0×0.6?0 (?0 is the wavelength in the free space). A good agreement between the simulation and the measurement results of the wideband patch was observed, which proves the interest of this approach. |
| Author(s): | A. Harrabi, T. Razban, Y. Mahe, L. Osman, A. Gharsallah |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1878 KB |
| Title: | The Use of FEKO for the Modeling of Test Set-ups for Radiated Susceptibility |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 494 KB |
| Title: | The UFFT Method Proposed for Optimization of a Corporate Feed Network Patch Antenna Array |
| File Type: | Conference Paper |
| Issue: | Volume: CAD Models and EM Solvers for Antenna Design Optimization Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 1231 KB |
| Title: | The Theoretical Analysis on Electromagnetic Signal Transmission for Down-hole to Surface |
| File Type: | Conference Paper |
| Issue: | Volume: 2-P2-A Electromagnetic Theory Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 276 KB |
| Title: | The Spatial Distributions of Radiation Emitted from a Sinusoidal Current Filament and a Dipole Antenna |
| Abstract: | While the analytical and numerical tools for determining the basic properties of a variety of antenna types have been long-established, there remains some continuing curiosity about how electromagnetic radiation is launched by such a simple antenna as a dipole. The following article discusses this problem in both the frequency domain and time domain. The sinusoidal current filament (SCF) is investigated first as a prototype of a wire dipole. The length-wise distribution of radiated power for the SCF is obtained from the distributed radiation resistance of Schelkunoff and Feldman, the induced electromotive force (IEMF) method, and the far-field analysis of radiation sources (FARS) developed by the author. The FARS approach is next used to analyze a frequency-domain numerical model of a dipole antenna, producing results similar to those for the SCF for a dipole of near-zero radius. Differentiating the decaying onsurface Poynting vector (PV) produces results comparable to those from FARS to explicitly demonstrate the power loss caused by radiation of the propagating current and charge. The lobed distributed radiated power is shown to be closely correlated with the square of the dipole current, confirming the cause of the radiation to be due to a partially reflected charge as the current and charge form standing waves on the dipole. Application of a time-domain version of FARS yields a smoothed length-wise distribution of radiated energy as opposed to the lobed variation of the frequency domain. |
| Author(s): | E. K. Miller |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 4 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1517 KB |
| Title: | The sidelobe power suppression for the aircraft circle phase array radar |
| File Type: | Conference Paper |
| Issue: | Volume: S45 Electromagnetic Methods for Devices and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 490 KB |
| Title: | The Search for an Equivalent Circuit for FIT Simulations using Discrete Ports in a Mutually-coupled Transmit/Receive Antenna Element Pair |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 228 KB |
| Title: | The SARFID Technique in Handling Systems Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Electromagnetic Techniques for the Internet of Things II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 563 KB |
| Title: | The Optimization of Arbitrary-Shape Conformal Array Antenna’s Performance Based on CSHPSO |
| File Type: | Conference Paper |
| Issue: | Volume: S10 Advanced Radar Technologies and Techniques II Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 341 KB |
| Title: | The Novel Normalized Method for Interference Suppression at Subarray Level |
| File Type: | Conference Paper |
| Issue: | Volume: S45 Electromagnetic Methods for Devices and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 151 KB |
| Title: | The Next Generation Air to Ground Communication System for Air Traffic Control |
| File Type: | Conference Paper |
| Issue: | Volume: System Architectures and Analysis Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 465 KB |
| Title: | The New Finite Array Tool in ANSYS HFSS |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Phased Array Modeling Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 417 KB |
| Title: | THE NEC2 RADIATION PATTERNS OF UNDER-SEGMENTED WIRE GRID MODELS OF A FIGHTER AIRCRAFT COMPARED TO MEASUREMENTS |
| Abstract: | This paper presents results of a NEC2 method of moments evaluation of VHF/UHF antennas on a wire grid model of a fighter aircraft. The study shows that practically useful radiation patterns results can be obtained when the grid model is considerably under-segmented in aircraft regions which are electrically far removed from the antennas. Normal modelling guide-lines requires approximately 35000 segments for the fighter grid model at 400 MHz; judicious under-segmentation gave useful results using a model comprising 5000 segments. This reduction in segments reduced computer time by a factor of 343 and memory requirements is reduced by a factor of 18. NEC2 radiation patterns are compared to measurements on a l/lOth scale model which was performed in an anechoic chamber compact range. [Vol. 10, No. 1 (1995), pp 5-14] |
| Author(s): | 0. Givati, A.P.C. Fourie, 0. Givati, A.P.C. Fourie |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 667 KB |
| Title: | The Marvels of Electromagnetic Band Gap (EBG) Structures |
| Abstract: | Artists and scientists alike have been fascinated by the existence of periodic structures in nature. When these structures interact with electromagnetic waves many unique features result. Observables are characteristics such as frequency stop-bands, pass-bands, and band-gaps. Various terminology have been used to classify these structures depending on the domain of the applications in filter designs, gratings, frequency selective surfaces (FSS), photonic crystals and band-gaps (PBG), etc. We prefer to classify them under the broad terminology of “Electromagnetic Band-gaps (EBG)”. Recently, many researchers have adopted this terminology. Broadly speaking, EBG structures are 3-D periodic objects that prevent the propagation of the electromagnetic waves in a specified band of frequency for all angles of arrival and for all polarization states of electromagnetic waves. In practice, however, it is very difficult to obtain such complete band-gap structures and partial band-gaps are achieved. Filters typically cover the scalar situation and single angle of arrival. FSS typically cover limited angles of arrival and respond differently to polarization states. PBG typically cover in-plane angles of arrival and also sensitive to polarization states. Surveying the literature, one finds that FSS terminology has been widely used in the microwave community while PBG terminology has been widely applied in the optical community. This overview paper presents a powerful computational engine utilizing Finite Difference Time Domain (FDTD) technique integrated with novel extrapolating algorithms to illustrate the marvels of EBG structures. The paper addresses structures such as (a) FSS structures, (b) PBG crystals, (c) smart surfaces for communication antenna applications, (d) surfaces with perfectly magnetic conducting properties (PMC), (e) creation of materials with negative permittivity and negative permeability, (f) surfaces with reduced edge diffraction effects and (g) reduction of mutual coupling among array antenna elements. Some representative applications of these structures are highlighted. In the last several years, there have been numerous published conference papers and journal articles dealing with the characterizations and applications of EBG structures. This paper is based on some of the results published by the author and his co-workers in the cited references. The reader is encouraged to perform detailed literature search to learn more about this area. |
| Author(s): | Y. Rahmat-Samii, Y. Rahmat-Samii |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 471 KB |
| Title: | THE LINEAR-PHASE TRIANGULAR FACET APPROXIMATION IN PHYSICAL OPTICS ANALYSIS OF REFLECTOR ANTENNAS |
| Abstract: | Numerical analysis of reflector antennas uses a discrete approximation of the radiation integral. The calculation replaces the actual reflector surface with a triangular facet representation. The physical optics current is then approximated within each facet. This paper provides analytical details of the method based on the assumption of a constant magnitude and linear-phase approximation of the physical optics current. Example calculations are provided for parabolic, elliptical, and shaped subreflectors. The computed results are compared with calculations made using a constant-phase approximation. These results show that the linear-phase approximation is a significant improvement over the constant-phase approximation in that the solution converges over a larger angular region of space. This improvement can significantly reduce storage requirements and possibly execution speed. [Vol. 6, No. 2, pp. 74-85 (1991)] |
| Author(s): | W. A. Imbriale, R. E. Hodges, W. A. Imbriale, R. E. Hodges |
| File Type: | Journal Paper |
| Issue: | Volume: 6 Number: 2 Year: 1991 |
| Download Link: | Click here to download PDF File Size: 409 KB |
| Title: | Validation of Wind Turbine Doppler Signatures in a Passive Bistatic Radar with a Point Scatterer Model |
| File Type: | Conference Paper |
| Issue: | Volume: S06 Advanced Radar Technologies and Techniques I Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 961 KB |
| Title: | VALIDATION OF THE MININEC3 CODE FOR COMPLEX RADIATING STRUCTURES |
| Abstract: | The ability of the MININEC3 code to accurately model complex radiating structures was previously unknown because computer compiler constraints limited the size of analyzable configuration. With the conversion of the code from BASIC to FORTRAN however it is now feasible to use it to simulate such structures. This paper presents the results of a validation exercise aimed at assessing the code's suitability for modelling configurations which involve hundreds of segments. [Vol. 9, No. 1 (1994), pp 58-66] |
| Author(s): | K.P. Murray, B.A. Austin, K.P. Murray, B.A. Austin |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 1 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 771 KB |
| Title: | Using the Best Uniform Approximation with Compression for Efficient Computation of Monostatic Scattering |
| Abstract: | The best uniform approximation method hybridized with Singular Value Decomposition (SVD) is proposed to reduce the time requirement for computation of monostatic Radar Cross Section (RCS). In contrast to our previous work, the traditional best uniform approximation technique is applied to compute the key excitation vectors instead of electric current vectors. Reduction of the number of multiple excitation vectors can lead to significantly reduced computation time. Furthermore, with low-rank property, the key excitation vectors could be further compressed by SVD, resulting in a more efficient method. Numerical results demonstrate that the proposed method is efficient for monostatic RCS calculation with high accuracy. |
| Author(s): | Z. Liu, S. He, X. Zhang, Y. Liu, Y. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 11 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 603 KB |
| Title: | Using Folded Open-Loop Ring Resonator to Design a Common-Mode Suppression and Frequency Adjustable Balun-Bandpass Filter |
| Abstract: | A compact and simple balun-bandpass filter was investigated by using a pair of half-wavelength open-loop ring resonators (OLRRs) and two microstrip lines. The balun-bandpass filter could be designed easily with a different center frequency by changing the path length of OLLRRs. The design methodology was adopted based on EM simulation to obtain these optimally designed parameters of the OLRRs, and microstrip lines and the filters were fabricated on FR4 substrate. The filters with the frequencies of 2.6 GHz and 5.2 GHz were designed to prove the characteristic of frequency adjustable and they were fabricated with the properties of wide bandwidth and low insertion loss. The balun-bandpass filters presented an excellent inband balanced performance with common-mode rejection ratio over than 40 dB and 34 dB in the passbands of 2.6 GHz and 5.2 GHz, respectively. Good correlation was seen between simulation and measurement, and the result showed that first run pass had been achieved in the majority of our design. |
| Author(s): | C.-M. Chen, S.-J. Chang, J.-C. Zheng, J.-C. Liou, C.-F. Yang |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 691 KB |
| Title: | Using FEKO Software for Analysis of Radiated Electric Field by Power Converters |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis - 2 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 336 KB |
| Title: | Using Circuit Simulation Optimization to Determine the Electrical Properties of Polymeric Composite Materials |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Methods for Nondestructive Evaluation and Materials Characterization Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 168 KB |
| Title: | Using Adaptive Cross Approximation for Efficient Calculation of Monostatic Scattering with Multiple Incident Angles |
| Abstract: | An adaptive cross approximation (ACA) based method is proposed for the fast analysis of the monostatic radar cross-section (RCS). Using the low-rank property, several largest eigenvalues and corresponding eigenvectors of the multiple right hand sides can be computed and saved efficiently by the ACA algorithm. The iterative solution of linear equations is required at these principle eigenvectors. Compared with solving linear equations at each angle repeatedly, the proposed method is able to greatly reduce the computation time. In order to efficiently solve the linear equations, the flexible general minimal residual (FGMRES) iterative solver is applied to compute the coefficients of Rao-Wilton-Glisson (RWG) basis functions. Numerical results demonstrate that the proposed method is efficient for monostatic RCS calculation with high accuracy. |
| Author(s): | Z. Liu, R. Chen, J. Chen, Z. Fan |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 4 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 2277 KB |
| Title: | Use of Model-Based Parameter Estimation in Electromagnetic Scattering Problems of a Conducting Body of Revolution |
| File Type: | Conference Paper |
| Issue: | Volume: Hybrid Techniques in Computational Electromagnetics Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 133 KB |
| Title: | Use of Model-Based Parameter Estimation for Fast RCS Computation of a Conducting Body of Revolution over a Frequency Band |
| Abstract: | Abstract—Frequency-derivative information incorporated with model-based parameter estimation (MBPE) is used to obtain scattering from a perfectly conducting body of revolution (BOR). The electric field integral equation (EFIE) is solved using the method of moments (MoM) to obtain the surface current on the perfectly conducting body. Instead of computing the MoM solution using a pointwise approach, a rational function model is used to approximate the current as a function of frequency. The model coefficients are computed using both frequency and frequency-derivative information at one frequency in the band or alternatively two or more frequencies in the band. With the rotational symmetry of BOR, the computational cost can be significantly reduced compared to that of arbitrary three-dimensional (3-D) objects and more importantly scattering from an electrically large body can be obtained. Numerical results for various perfectly conducting bodies are presented. Results show that the MBPE provides excellent agreement with the pointwise approach over a limited frequency band. In addition, the MBPE performs well for predicting sharp resonances. |
| Author(s): | Hyunwung Son, Joseph R. Mautz, Ercument Arvas, Hyunwung Son, Joseph R. Mautz, Ercument Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 437 KB |
| Title: | Use of Hanging Variables for Nested h Refinement in 2D FETD |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Finite Element Technique and its Applications Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 879 KB |
| Title: | Use of Dielectric Spectroscopy for the Study of Concentration of Glyphosate in Distilled Water |
| File Type: | Conference Paper |
| Issue: | Volume: S14 Numerical Methods for Diverse Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 495 KB |
| Title: | Use of Dielectric Spectroscopy for the Study of Concentration of Glyphosate in Distilled Water |
| Abstract: | In this paper, the capability of sensing low concentrations of glyphosate in water of two interdigital capacitive transducers are analyzed using numerical simulations and measurements. Each microwave sensor is analyzed using the surface electric field produced at the resonance frequency. In addition, the reflection coefficient of each transducer submerged in water with glyphosate is measured and compared with distilled water. Prepared samples with concentrations of 1ppm/L (1 part per million over a liter of distilled water) are used for the experimental tests. |
| Author(s): | C. Mendivelso, J. J. Pantoja, F. Vega, C. Kasmi, F. Al Yafei |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1454 KB |
| Title: | Unsplit-Field Implementation of the Higher-Order PML using Z-Transform Method and D-B Formulation for Arbitrary Media |
| Abstract: | On the basis of the stretched coordinate perfectly matched layer (SC-PML) formulations, the Z-transform method, and D-B formulation, an efficient and unsplit-field implementation of the higher-order PML scheme with more than one pole is proposed to truncate the finite-difference time-domain (FDTD) lattices. This method is completely independent of the material properties of the FDTD computational domain and hence can be applied to the modeling of arbitrary media without any modification. The higher-order PML has the advantages of both the conventional PML and the complex frequency shifted PML (CFS-PML) in terms of absorbing performances. The proposed algorithm is validated through two numerical tests carried out in three dimensional and two dimensional domains. It is shown in the numerical tests that the proposed PML formulations with the higher-order scheme are efficient in terms of attenuating both the low-frequency propagating waves and evanescent waves and reducing late-time reflections, and also hold much better absorbing performances than the conventional SC-PML and the convolutional PML (CPML) with the CFS scheme. |
| Author(s): | N. Feng, J. Li, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 3 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 288 KB |
| Title: | Unmanned Aerial Vehicle Platform Stabilization for Remote Radar Life Sensing |
| Abstract: | Unmanned Aerial Vehicle (UAV) platforms are increasingly ubiquitous and an ideal platform for rapid deployment to conduct remote sensing. However, for radar sensors that measure the phase of the signal of interest, the platform must be stabilized to avoid signal distortion. Measurement of respiratory motion with a continuous wave Doppler radar sensor is vulnerable to platform motion and requires a stable platform and post-detection motion compensation signal processing. We have investigated feedback stabilization techniques via simulation and empirical measurements using a bench top test fixture to remove the motion noise, where we observed a 86% reduction in motion, resulting in a SNR improvement of 29 dB after motion compensation. |
| Author(s): | R. H. Nakata, B. Haruna, S. K. Clemens, D. Martin, C. Jaquiro, V. M. Lubecke |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 5 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2417 KB |
| Title: | Unmanned Aerial Vehicle Platform Stabilization for Remote Radar Life Sensing |
| Abstract: | Unmanned Aerial Vehicle (UAV) platforms are increasingly ubiquitous and an ideal platform for rapid deployment to conduct remote sensing. However, for radar sensors that measure the phase of the signal of interest, the platform must be stabilized to avoid signal distortion. Measurement of respiratory motion with a continuous wave Doppler radar sensor is vulnerable to platform motion and requires a stable platform and postdetection motion compensation signal processing. We have investigated feedback stabilization techniques via simulation and empirical measurements using a bench top test fixture to remove the motion noise, where we observed a 86% reduction in motion, resulting in a SNR improvement of 29 dB after motion compensation. |
| Author(s): | R. H. Nakata, B. Haruna, S. K. Clemens, D. Martin, C. Jaquiro, V. M. Lubecke |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1838 KB |
| Title: | Unmanned Aerial Vehicle Platform Stabilization for Remote Radar Life Sensing |
| Abstract: | Unmanned Aerial Vehicle (UAV) platforms are increasingly ubiquitous and an ideal platform for rapid deployment to conduct remote sensing. However, for radar sensors that measure the phase of the signal of interest, the platform must be stabilized to avoid signal distortion. Measurement of respiratory motion with a continuous wave Doppler radar sensor is vulnerable to platform motion and requires a stable platform and postdetection motion compensation signal processing. We have investigated feedback stabilization techniques via simulation and empirical measurements using a bench top test fixture to remove the motion noise, where we observed a 86% reduction in motion, resulting in a SNR improvement of 29 dB after motion compensation. |
| Author(s): | R. H. Nakata, B. Haruna, S. K. Clemens, D. Martin, C. Jaquiro, V. M. Lubecke |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1838 KB |
| Title: | Unitary Matrix Pencil Method for Sparse Linear Array Pattern Synthesis |
| File Type: | Conference Paper |
| Issue: | Volume: 2-3-B Modeling, Design and Optimization of Modern Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 269 KB |
| Title: | Unilateral Amplifier S-Parameter Extraction Technique |
| File Type: | Conference Paper |
| Issue: | Volume: Design and Analysis of Advanced Circuit Architectures Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 179 KB |
| Title: | Uniaxial Dielectric Waveguide Filter Design Accounting for Losses Using Mode Matching Technique |
| Abstract: | Dielectric filters can provide compact solutions for filter design problems. However, most dielectrics exhibit uniaxial properties, as well as, losses that will undoubtedly affect performance if not accounted for. This paper derives dispersion relations for lossy uniaxial media in dielectric waveguides and also accounts for lossy conducting walls. The waveguide discontinuity problem in the presence of lossy uniaxial media and finite conductivity waveguide walls, is calculated by mode matching technique and the results are applied to a Ka band filter. The design specifications for the proposed filter are a 32.5 GHz center frequency with 6%. Good agreement between simulated and measured results are shown. |
| Author(s): | L. Murphy, J. Mautz, M. Yazdani, E. Arvas, S. Tozin |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 7 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 856 KB |
| Title: | Unequal Y-Power Divider Kron-Branin Model |
| File Type: | Conference Paper |
| Issue: | Volume: 2-P2-C RFID Antennas and Systems Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 291 KB |
| Title: | Underground Localization System using a Combination of RFID and IMU Technologies |
| File Type: | Conference Paper |
| Issue: | Volume: S24 Student Paper Competition - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1427 KB |
| Title: | Underground Localization System using a Combination of RFID and IMU Technologies |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Advanced Optimization of Electromagnetic Structures - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1427 KB |
| Title: | Unconditionally-Stable Meshless Methods Using Different Split-Step Techniques and Their Phase Velocity Considerations |
| Abstract: | In this paper, new unconditionallystable meshless methods based on different splitstep methods are proposed. Moreover, comparison of the phase velocities of two different split-step meshless methods and that of alternativedirection- implicit meshless (ADI-ML) method is presented. Here we show how employing splitstep (SS) technique using radial point interpolation meshless (RPIM) method results in an unconditionally stable scheme. Symmetric operators and uniform splitting are utilized simultaneously to split the classical Maxwell’s matrix into four and six submatrices. Also, for more accurate approximations Crank-Nicolson (CN) scheme that is a fully implicit scheme has been applied for implementation of these schemes. It has been demonstrated, these proposed methods produce even more effective unconditionally stable responses than those of alternatingdirection- implicit meshless time-domain ADIMLTD methods. Eventually, in order to prove the advantage of the proposed method, a comparison has been made between these novel meshless methods and their finite-difference counterparts. More smoothed phase velocities in proposed meshless methods imply a reduction in dispersion error in comparison with their analogous cases in finite-difference time-domain (FDTD) method. |
| Author(s): | F. Ansarizadeh, M. Movahhedi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 9 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 354 KB |
| Title: | Unconditionally Stable Locally One-Dimensional FDTD Methods for Efficient Electromagnetic Simulations |
| File Type: | Conference Paper |
| Issue: | Volume: Optoelectronic modeling Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 77 KB |
| Title: | Uncertainty Quantification of the Crosstalk in Multiconductor Transmission Lines via Degree Adaptive Stochastic Response Surface Method |
| Abstract: | The degree adaptive stochastic response surface method is applied to analyze statistically the crosstalk in multiconductor transmission lines (MTLs). The coefficient of polynomial chaos expansion (PCE) is obtained based on the least angle regression. The truncation degree of PCE is iterated using the degree adaptive truncation algorithm, and the optimal proxy model of the crosstalk of the original MTLs that satisfies the actual error requirements is calculated. The statistical properties of crosstalk in MTLs (such as mean, standard deviation, skewness, kurtosis, and probability density distribution) are obtained. The failure probability of the electromagnetic compatibility in the MTLs system is considered. The global sensitivity indices of crosstalkrelated factors are analyzed. Finally, the proposed method is proved to be effective compared with the conventional Monte Carlo method. The uncertainty quantification of crosstalk in MTLs can be calculated efficiently and accurately. |
| Author(s): | Q. Yu, W. Liu, K. Yang, X. Ma, T. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1551 KB |
| Title: | Uncertainty Quantification Method of Crosstalk Involving Braided-Shielded Cable |
| Abstract: | In this paper, in view of the uncertainty of geometric parameters of braided-shielded cable and structural parameters of the shield in practical problems, polynomial chaos expansions (PCE) is used to explore the uncertainty quantification of a crosstalk calculation model of braided-shielded cable. First, the model based on multi-conductor transmission line theory is expanded by PCE. Second, the truncation degrees of polynomials and sample size of PCE are determined by the leave-one- out method, and the statistical characteristic parameters of crosstalk are obtained by combining coefficients of polynomials. Compared with the calculation results of the Monte Carlo method, the mean value, standard deviation and probability density function obtained by the two methods are basically consistent, but the PCE method has obvious advantages in calculation efficiency. Finally, the influence of input variable parameters in the crosstalk calculation model of braided-shielded cable are calculated by combining the PCE and the Sobol’s global sensitivity analysis method, which provides theoretical guidance for the electromagnetic compatibility design of electrical and electronic equipment using braided-shielded cable. |
| Author(s): | T. Tan, T. Jiang, H. Jiang, T. Wang, M. Ca |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 1 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 901 KB |
| Title: | Uncertainty Quantification in Transcranial Magnetic Stimulation with Correlation Between Tissue Conductivities |
| File Type: | Conference Paper |
| Issue: | Volume: S17 Uncertainty Quantification in CEM Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 1019 KB |
| Title: | Uncertainty Quantification and Global Sensitivity Analysis of Radiated Susceptibility in Multiconductor Transmission Lines using Adaptive Sparse Polynomial Chaos Expansions |
| Abstract: | This study analyzes the uncertainties of the radiated susceptibility in multiconductor transmission lines (MTLs), and introduces an adaptive sparse polynomial chaos expansion combining hyperbolic truncation scheme with orthogonal matching pursuit method (AS-PCE (OMP)). This method is used as the basis to realize the uncertainty quantification (UQ) of radiated susceptibility and global sensitivity analysis (GSA) of input variables to output variables. GSA considers the influencing factors of the incident field and transmission-line geometric parameters. The global sensitivity indices of each input variable are calculated for varying impedance loads. The accuracy and efficiency of the proposed method are verified compared with the results of the polynomial chaos expansion based least angle regression method and Monte Carlo methods. |
| Author(s): | Y. Zhu, Y. Wang, Q. Yu, D. Wu, Y. Zhang, T. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 10 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1113 KB |
| Title: | Uncertainty Problem as Illustrated by Magnetotherapy |
| Abstract: | This article presents the impact of fixed tissue conductivities on the distribution of eddy currents in human body. Electrical conductivities characterising human tissues present in limbs have been collated based on various publications from the last 25 years. The article shows the extent to which simulation results are affected by changes to electrical conductivity of specific tissues. It has been demonstrated that the tissues taking the largest part of the studied domain have the greatest impact. The conclusions from these results suggest that it is very important to determine the electrical conductivity of tissues forming the human body with increasing precision, as it is an important factor affecting the accuracy of results. This factor seems much more significant than the growth in the precision of models resulting from increasing resolution of numerical models made available for research purposes. |
| Author(s): | P. Syrek |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1737 KB |
| Title: | Uncertainty Analysis on Band-Stop Filter Using Data-Driven Arbitrary Polynomial Chaos |
| File Type: | Conference Paper |
| Issue: | Volume: S17 Uncertainty Quantification in CEM Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 273 KB |
| Title: | Uncertainty Analysis of Reflection Coefficient for a Coating with Random Flaws Using Adaptive Mesh and DGTD Method |
| Abstract: | An imperfect coating shall cause uncertainties in the analysis of electromagnetic properties. To quantify the influence of irregularity, complexity, and uncertainty of the coatings for electronic devices, an adaptive mesh algorithm combined with the discontinuous Galerkin time domain (AM-DGTD) method is developed. The uncertain variations are incorporated into the proposed algorithm by an appropriate parameterization. The standard statistical analysis is performed to calculate the appropriate moments, i.e., mean and variance. The developed method is validated by modeling a dielectric coating with uncertain flaws in an adaptive mesh grid. The computed quantities of interest from numerical estimations are compared with the analytical values, these results agree with the physical explanation, and are in good agreement with the exact values, as demonstrated by numerical experiments. |
| Author(s): | H. Li, I. Hussain, Y. Wang, Q. Cao |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 5 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2878 KB |
| Title: | Uncertainty Analysis in EMC Simulation Based on Improved Method of Moments |
| Abstract: | Recently, many uncertainty analysis methods have been taken into consideration in electromagnetic compatibility (EMC) simulation. As a traditional method, the Method of Moments (MoM) owns many advantages compared with other methods, especially in calculating the high dimension problems. However, its main disadvantage is the poor accuracy. In this paper, the Richardson extrapolation has been used to improve the MoM in order to promote the accuracy. By using feature selective validation (FSV), the effectiveness of the improvement can be obviously shown compared with the standard results calculated by the Monte Carlo Method (MC). |
| Author(s): | J. Bai, G. Zhang, L. Wang, T. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 321 KB |
| Title: | Ultrawide band Negative Refraction Based on Moving Media Concept |
| Abstract: | The anomalous wave propagation in a homogeneous, isotropic and lossless medium that moves with a constant velocity along the axis of a rectangular waveguide; and its interesting properties lead us to the fact that the moving media may be regarded as double negative metamaterial (DNG). In this paper, the correct sign of the permittivity and permeability of an equivalent stationary media, for each TE and TM modes and for both low and high dielectric velocities are investigated and it is shown that this medium acts as a DNG material over specific frequency ranges. |
| Author(s): | A. Jafargholi, A. Jafargholi |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 11 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 665 KB |
| Title: | Ultrabroadband Polarization-insensitive Far-infrared Metameterial Absorber by Gold Nanowire Array |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-C Properties, Modelling and Novel Concepts of Artificial Electromagnetic Structures I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 351 KB |
| Title: | Ultra-wideband Transmissive Linear Polarization Device Based on Graphene |
| Abstract: | In order to achieve both adjustable wideband and high Polarization Conversion Rate (PCR) of the transmitted waves, a novelty tri-layered structure is proposed for terahertz applications. The Rhombus Hollow Square (RHS) is built up by top and bottom gold gratings on Silicon Dioxide and Polyamide substrate with graphene strips. The proposed polarizer broadens the bandwidth and has well performance. As chemical potential increases, the bandwidth is also broadened by adjusting the graphene. From 0.5 THz to 3 THz, the PCR is greater than 90%, and the relative bandwidth up to 142.9%. The transmission and absorption of polarizer are analyzed at the oblique incidence with chemical potential 0.1eV. By simulating and analyzing the performance, a new result of maintaining broadband and high transmittance in oblique incidence is obtained. |
| Author(s): | L. Guo, S. Li, X. Jiang, X. Liao, L. Peng |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 7 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1612 KB |
| Title: | Ultra-wideband Terahertz Absorber Based on E Shape Graphene Pattern |
| Abstract: | We present a tunable ultra-wideband (UWB) absorber based on a multilayer of “E” shaped graphene patterns. The numerically calculated results indicate that the absorption of the proposed design is above 95% in the range of 1.12 to 14.04 THz. By using the multiple layers of graphene, the relative bandwidth is 95% and reaches up to 170% of the central frequency. Furthermore, for transverse electric polarization mode at a resonating frequency of 1.68, 3.99, 7.51, 13.56, and 17.74 THz the absolute value exceeds 99.57, 99.37, 99.94, 99.86, and 99.09%, respectively. Also, owing to the structure’s rotational symmetry, the absorber is insensitive to both transverse magnetic (TM) and transverse electric (TE) polarization. The absorption peaks and frequency band can be controlled effectively by altering the Fermi level of graphene without modifying the structure manually. Moreover, the absorber exhibits steady absorption over an incident angle of 0° to 60°, with just a minor decrease in bandwidth around 60°. |
| Author(s): | M. Sajjad, X. Kong, S. Liu, S. U. Rahman, Z. Khan, Owais |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 2 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1182 KB |
| Title: | Ultra-Wideband Six-port Network Constructed by 90° and In-Phase Power Dividers |
| Abstract: | This article proposes a six-port network design with an ultra-wideband operation from 3.1 to 10.6 GHz. The proposed six-port configuration is constructed by two types of power dividers with different phase characteristics of 0° (in-phase) and 90°. The new proposed configuration eliminates one unused port of the conventional six-port. Both components forming the proposed six-port are designed utilizing the microstrip-slot technique to accomplish the designated UWB operating frequency. The six-port is designed via the use of CST Microwave Studio (CST MWS) and realised by applying Rogers TMM4 substrate. Comparable simulated and measured performances are achieved in terms of S-parameters and phase differences between each consecutive port across UWB frequency range. |
| Author(s): | N. Seman, K. H. Yusof, M. H. Jamaluddin, T. A. Rahman |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1645 KB |
| Title: | Ultra-Wideband Polarization Conversion Metasurface Based on Topology Optimal Design and Geometry Tailor |
| Abstract: | We presented a topology optimization method based on genetic algorithm (GA) combined geometry tailor scheme (GTS) to realize ultra-wideband polarization conversion metasurfaces (UPCM) in microwave range. The present method takes the connectivity condition of the elements into consideration, thereby resulting in good optimization efficiency. As examples, a UPCM is designed by topology optimization, which is composed of the dielectric substrate sandwiched with patched metallic patterns and continuous metal background. Three plasmon resonances are generated by electric and magnetic resonances, which lead to bandwidth expansion of cross-polarization reflection. The simulated results show that the maximum conversion efficiency is nearly 100% at the three plasmon resonance frequencies and the 3 dB bandwidth range from 5.66 to 24.68 GHz can be achieved for both normally incident x- and y-polarized waves. |
| Author(s): | S. Sui, J. Yu, H. Ma, J. Zhang, J. Wang, Z. Xu, S. Qu |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1774 KB |
| Title: | Electro-Magnetic Simulation in Design of High Sensitivity NMR Probes using High-Temperature-Superconductors |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 403 KB |
| Title: | Electro-Magnetic Simulation in Design of High Sensitivity NMR Probes using High-Temperature-Superconductors |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic-Simulation-Driven-Design: Modeling and Optimization Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 403 KB |
| Title: | WLP-FDTD Implementation of CFS-PML for Plasma Media |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Finite-Difference Time-Domain Method: Theory and Applications Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 181 KB |
| Title: | WLAN Based Indoor Positioning in Building Halls by Using Trilateral |
| File Type: | Conference Paper |
| Issue: | Volume: S23 RF/Microwave Electromagnetics - Computational Modeling and Experiments Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 309 KB |
| Title: | WIPL-D Optimization of a Harmonic RF Tag |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications Using WIPL-D Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 340 KB |
| Title: | Where Intangibles Collide |
| File Type: | Newsletter Paper |
| Issue: | Volume: 20 Number: 2 Year: 2005 |
| Download Link: | Click here to download PDF File Size: 214 KB |
| Title: | Wave Propagation on Two Dimensional Doubly-Periodic Guiding Structures. |
| File Type: | Conference Paper |
| Issue: | Volume: Computer Simulation of Electromagnetic-System Testing Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 168 KB |
| Title: | Validating Numerical Models – Quantifying Error |
| Abstract: | |
| Author(s): | |
| File Type: | Newsletter Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 107 KB |
| Title: | Utilizing Particle Swarm Optimization in the Field Computation of Non-Linear Magnetic Media |
| Abstract: | It is well known that the computation of magnetic fields in nonlinear magnetic media my be carried out using various techniques. In the case of problems involving complex geometries or magnetic media, numerical approaches become especially more appealing. The purpose of the paper is to present an automated particle swarm optimization approach using which field computations may be carried out |
| Author(s): | A. A. Adly, S. K. Abd-El-Hafiz, A. A. Adly, S. K. Abd-El-Hafiz |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 222 KB |
| Title: | 3B-SPLINES IN THE INTEGRAL EQUATION SOLUTION FOR SCATTERING FROM BODIES OF REVOLUTION |
| Abstract: | The use of B-Splines functions is investigated in conjunction with the Method of Moments integral-equation solution to the problem of scattering from conducting bodies of revolution. Its computational performance in terms of relative accuracy and storage/CPU time requirements is evaluated against entire-domain and sampling-like basis functions. Particular attention is given to the description of current near edges. Questions of time (space) and frequency (wavenumber) localization are also addressed. A simple scheme devised to enforce boundary conditions a priori is shown to potentially capable to stgabilize otherwise spurious solutions |
| Author(s): | F.L. Teixeira, J.R. Bergmann, F.L. Teixeira, J.R. Bergmann |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 532 KB |
| Title: | ELECTROMAGNETIC PROPERTIES OF A CHIRAL-PLASMA MEDIUM |
| Abstract: | The theoretical properties of a composite chiral-plasma medium are devel- oped. Using the reaction theorem, we obtain the proof of nonreciprocity based upon the constitutive relationships between the electromagnetic vectors E, B, H, D. Using the Maxwell's equations and the proposed constitutive relations for a chiral- plasma medium, we derive the E, and H, vector equations and from these equations, dispersion relations and E-field polarizations are found. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 14-18] MTRT - A MODIFIED TRANSVERSE RESONANCE TECHNIQUE |
| Author(s): | Hector Torres-Silva, Norma Reggiani, Paulo H. Sakanaka, Hector Torres-Silva, Norma Reggiani, Paulo H. Sakanaka |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 283 KB |
| Title: | EFFECT OF THE MAGNETIC ANISOTROPY ON THE CHARACTERISTICS OF MICROSTRIP ANTENNAS WITH SEVERAL LAYERS |
| Abstract: | The main objective of this work is to show how the properties of a ferrimagnetic material change the characteristics of a microstrip patch with several layers. Particularly, it is investigated how the resonant frequency and the radiation pattern are changed by varying the ferrimagnetic layer thickness or the magnitude and/or direction of the external applied magnetic field. The analysis is carried on by using Hertz potentials and Galerkin method. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 26-29] |
| Author(s): | Jose de Ribamar Silva Oliveira, Adaildo Gomes d'Assunc o, Jose de Ribamar Silva Oliveira, Adaildo Gomes d'Assunc o |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 244 KB |
| Title: | DISPERSIVE ANALYSIS OF CIRCULAR CYLINDRICAL MICROSTRIPS AND BACKED SLOTLINES |
| Abstract: | In this work, the full-wave analysis of circular cylindrical microstrips and backed slotlines is performed, by using a combination of Hertz vector potentials and Galerkin method. The analysis is developed in the spectral domain. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 30-33] |
| Author(s): | Laercio Martins de Mendonca, Adaildo Gomes d'Assunc o, Laercio Martins de Mendonca, Adaildo Gomes d'Assunc o |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 268 KB |
| Title: | FINITE ELEMENT ANALYSIS AND EVALUATION OF ELECTROMAGNETIC FIELDS GENERATED BY ATMOSPHERIC DISCHARGES |
| Abstract: | A lightning return stroke channel is modeled by a high loss transmission line. The differential equations that represent its dynamic behavior are solved by the application of the one-dimensional finite element method (FEM). By the combination of FEM results with the use of Maxwell equations applied to the dipole method, electric and magnetic (EM) fields are evaluated at various positions in space. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 34-38] |
| Author(s): | E.H.R Coppoli, R.R. Saldanha, A. Konrad, E.H.R Coppoli, R.R. Saldanha, A. Konrad |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 318 KB |
| Title: | ERROR ESTIMATORS IN SELF-ADAPTIVE FINITE ELEMENT FIELD CALCULATION |
| Abstract: | The aim of this paper is to present different error estimates to improve accuracy in linear and nonlinear self-adaptive finite element field calculation. The first estimator is based on the polynomial theory, the second one makes an estimation of the flux density divergence, the third one is linked to a magnetomotive force associated to elements sides, and the fourth one is based on the use of the bilinear element. All methods were implemented in our software named LMAG2D developed at "Escola Politecnica da Universitade de S o Paulo", Brazil. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 44-49] |
| Author(s): | L. Lebensztajn, J.R. Cardoso Cardoso, L. Lebensztajn, J.R. Cardoso Cardoso |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 386 KB |
| Title: | TRANSIENT VOLTAGE AND ELECTRIC FIELD DISTRIBUTIONS IN AIR CORE REACTORS |
| Abstract: | This work presents a computational model for the evaluation of transient voltage and longitudinal electric field distributions in single layer air core reactors. The influence of a grounded shielding concentric to the reactor is considered. The validity of the model is verified by comparing computed and measured voltage responses at three taps of a test reactor. Analyses showing the influence of the grounded shielding, front time and front wave shape of the applied voltage on the maximum longitudinal electric stresses along the reactor winding are presented. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 50-55] |
| Author(s): | S. L. Varricchio, N. H. C. Santiago, S. L. Varricchio, N. H. C. Santiago |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 324 KB |
| Title: | CALCULATION OF ELECTRIC FIELD CREATED BY TRANSMISSION LINES, BY 3D-FE METHOD USING COMPLEX ELECTRIC SCALAR POTENTIAL |
| Abstract: | This paper presents a methodology for tridimensional analysis of the electric field produced by transmission lines. It utilizes the complex electric scalar potential, which makes it possible to consider variation of module and phase in the voltages of supply lines. The Finite Element Method (FEM) is applied to solve the differential equation that describes the phenomenon in the domain of this study. Finally, a comparison is established between the results obtained applying the proposed methodology and the values reached through the classical method of charge simulation. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 56-60] |
| Author(s): | Ricardo Marcal Matias, Adroaldo Raizer, Ricardo Marcal Matias, Adroaldo Raizer |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 330 KB |
| Title: | ADAPTIVE FINITE ELEMENT MESH REFINEMENT AND 'A POSTERIORI' ERROR ESTIMATION PROCEDURES FOR ELECTROMAGNETIC FIELD COMPUTATION |
| Abstract: | Adaptive Finite Element (FE) mesh refinement combined with a robust and functionally reliable error estimate provides nearly optimal solution accuracy. The efficiency of adaptivity depends on the effectiveness of the mesh refinement algorithm and also on the availability of a reliable and computationally inexpensive error estimation strategy. An adaptive mesh refinement algorithm utilizing a hierarchical minimal tree based data structure for 2D and 3D problems is discussed in this paper. Two different 'a posteriori' error estimation schemes, one based on the local element by element method and the other using the gradient of field approach are also presented. The usefulness of the mesh refinement algorithm and the error estimation strategies are demonstrated by adaptively solving a set of 2D and 3D linear boundary value problems. The performance of the error estimates is also verified for adaptive modeling of a nonlinear problem involving the design of a permanent magnet synchronous machine. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 61-68 |
| Author(s): | K.C. Chellamuthu, Natan Ida, Q.k. Zhang, K.C. Chellamuthu, Natan Ida, Q.k. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 656 KB |
| Title: | DESIGN OF ELECTRICAL MACHINES AIDED BY FIELD CALCULATION AND FACTORIAL EXPERIMENTS METHOD |
| Abstract: | An approach for electrical machines design by using magnetic field computation coupled to factorial experiments is presented in this paper. Principles of factorial experiments are briefly reviewed and their application to design optimisation is explained. In this application experiments are replaced by magnetic field calculations. The procedure, which performs automatically all the numerical field calculations required, is described. The whole procedure is applied to a typical problem concerning permanent magnets synchronous motor with polar pieces. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 69-73] |
| Author(s): | C. Pertusa, S.Astier, Y.Lefevre, M.Lajoie-Mazenc, C. Pertusa, S.Astier, Y.Lefevre, M.Lajoie-Mazenc |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 317 KB |
| Title: | LIMITATIONS OF THE CONVENTIONAL METHODS OF FORCE AND TORQUE PREDICTION |
| Abstract: | The calculation of forces and torques developed in electromechanical devices, and their variation with changes in position or excitation, is often what the designer is, ultimately, interested in. This paper addresses some of the problems associated with the force and torque calculations based on numerical field solutions for 2-D magnetostatic problems. The problem of calculating the cogging torque characteristic of a neodymium-iron-boron permanent-magnet motor is considered and the technique of torque measurement is described briefly. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 74-79] |
| Author(s): | Antonio Flavio Licari o Nogueira, Antonio Flavio Licari o Nogueira |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 480 KB |
| Title: | COMPARISON OF CONVERGENCE RATES OF EDGE AND NODAL FINITE ELEMENTS FOR MAGNETOSTATIC PROBLEMS |
| Abstract: | Mathematical theory is used to obtain convergence estimations for magnetostatic formulations using nodal and edge elements. Numerical results of two closed boundary problems that confirm the theory are presented. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 80-83] |
| Author(s): | M. L. y Gonzalez, R. C. MesquitaM. L. y GonzalezMesquita, J. P. A. Bastos, M. L. y Gonzalez, R. C. MesquitaM. L. y GonzalezMesquita, J. P. A. Bastos |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 231 KB |
| Title: | FINITE ELEMENT SIMULATION OF AN OUT-OF-PHASE SYNCHRONIZATION OF A SYNCHRONOUS MACHINE |
| Abstract: | This paper presents the finite element simulations of the out-of-phase synchronization of a synchronous machine with an external electric system. Two cases were analysed regarding to the phase angle: 120 and 180 . Computed results are analysed and compared to analyticalvalues.[Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 84-89] |
| Author(s): | Silvio Ikuyo Nabeta, Albert Foggia, Jean-Louis Coulomb, Gilbert Reyne, Silvio Ikuyo Nabeta, Albert Foggia, Jean-Louis Coulomb, Gilbert Reyne |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 306 KB |
| Title: | A 3D FINITE-ELEMENT COMPUTATION OF STATOR END-WINDING LEAKAGE INDUCTANCE AND FORCES AT STEADY STATE OPERATING CONDITIONS IN LARGE HYDROGENERATORS |
| Abstract: | The forces acting on the stator end windings of a hydrogenerator at steady state operating conditions, as well as the end-winding leakage inductance, are calculated using a 3D finite element package. A more realistic representation for the geometry of the windings and boundaries is considered. The effects of different representations for the stator core end surface are outlined. The computed values of the inductance from time harmonic and static simulations are presented and compared with classical analytical methods. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 90-96] |
| Author(s): | Viviane Cristine Silva, Albert Foggia, Viviane Cristine Silva, Albert Foggia |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 520 KB |
| Title: | IMPROVING THE CHARGE SIMULATION METHOD FOR THE COMPUTATION OF HIGH VOLTAGE ELECTRIC FIELDS WITH EFFICIENT LEAST SQUARES TECHNIQUES |
| Abstract: | The well known Charge Simulation Method, which is commonly used for electric field calculations, is shown to be a particular and ill-conditioned case of the Least Squares Charge Simulation Method. By solving a practical problem, it is shown how to efficiently handle a least squares problem, thus obtaining results of higher precision if compared to the traditional Charge Simulation Method For the solution of the resulting linear system, several mathematical methods are analyzed and compared, being stated that the optimum combination of higher precision, lesser error propagation, lesser CPU time and lesser computer RAM are simultaneously reached when applying the Least Squares Charge Simulation Method, solved with the QR decomposition and Householder transformations. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 97-102] |
| Author(s): | J. N. Hoffmann, P. Pulino, J. N. Hoffmann, P. Pulino |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 467 KB |
| Title: | A HYBRID FINITE DIFFERENCES, AND CHARGE SIMULATION METHOD FOR THE COMPUTATION OF HIGH VOLTAGE ELECTRIC FIELDS |
| Abstract: | A new treatment is proposed to the hybrid method of Finite Differences and Charge Simulation for the computation os electric fields, entirely applicable to the similar hybrid method of Finite Element and Charge Simulation. The resulting system of linear equations is solved by using the fixed point theory, the QR decomposition and the Conjugate Gradients Squared method with a preconditioning technique. New procedures are suggested for the discretization of the boundary conditions, which lead to results with higher precision. Case studies are included. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 103-110] |
| Author(s): | J. N. Hoffmann, P. Pulino, J. N. Hoffmann, P. Pulino |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 593 KB |
| Title: | FINITE ELEMENT MODELING OF ELECTRICAL MACHINES BY SIMULTANEOUS RESOLUTION OF FIELDS AND ELECTRIC CIRCUITS EQUATIONS |
| Abstract: | In this work, we present a methodology for solving simultaneously the equations of magnetic fields and electric circuits of electrical machines. To consider the magnetic phenomena the Finite Element method is used. The machines are voltage fed and, thus, the electric circuit equations are present in the matricial system which takes into account both physical aspects. A time stepping technique is employed to simulate the steady and transient states. As result, we obtain the magnetic vector potential describing the magnetic behavior of the machine and the current established in the exciting coils. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 111-116] |
| Author(s): | N. Sadowski, R. Carlson, J. P. A. Bastos, M. Lajoie-Mazenc, N. Sadowski, R. Carlson, J. P. A. Bastos, M. Lajoie-Mazenc |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 443 KB |
| Title: | SHAPE DESIGN OPTIMIZATION OF POWER FREQUENCY ELECTROMAGNETIC DEVICES USING NUMERICAL METHODS |
| Abstract: | This paper presents the mathematical formulation concerning the solution of inverse electromagnetic problems, i.e. the shape optimization of power frequency electromagnetic devices, based on a combination of numerical methods. The optimization problem is solved using deterministic methods in which the electromagnetic field problem is treated as a subproblem of the optimization process. The field problem is calculated using the finite element (FE) method. Three deterministic approaches are studied in detail, the quadratic extended penalty method (QUA), the augmented Lagrange multiplier (ALM) method and the constrained quasi-Newton method (PLBA-CR). The work highlights the advantages and drawbacks of each approach. The search direction for the optimization is found by two distinct methods, the direct differentiation of the FE matrices and the finite difference (FD) method. In total, three problems are discussed in order to show the power and applicability of the theory presented. The PLBA-CR, when combined with the direct differentiation of the FE matrices, appears to offer important advantages over the other methods. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 117-124] |
| Author(s): | Jaime A. Ramirez, Ernest M. Freeman, C. Chat-uthai, Jo o A. Vasconcelos, Jaime A. Ramirez, Ernest M. Freeman, C. Chat-uthai, Jo o A. Vasconcelos |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 485 KB |
| Title: | DETERMINATION AND ANALYSIS OF CAUSES OF INDUCTION MOTOR MAGNETIC NOISE |
| Abstract: | This paper presents the causes of the acoustic noise magnetically generated by three-phase induction electric motors and some results of tests and calculation are discussed. The influence of the rotor slots skewing on the reduction of the magnetic noise is also analysed through calculated values. The paper gives a general view about how the magnetic noise in induction motors is generated and how much its prevision is important during the design stage. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 125-131] |
| Author(s): | Sebasti o Lauro Nau, Solon Brum Silveira, Sebasti o Lauro Nau, Solon Brum Silveira |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 459 KB |
| Title: | GROUND-3D LINKED TO LINE PARAMETERS: A METHOD TO FAULT CURRENT DISTRIBUTION AND EARTH POTENTIAL DETERMINATION |
| Abstract: | In previous work [1,2] the author presents a methodology, based on finite elements method (FEM), to calculate the potential distribution influence on the grounding area. At that time the input of the solver admits as known the split of the system. The aim of this article is to demonstrate the advantages of finite element method (FEM) associated with power systems equations with lumped parameters to intrinsically obtain the distribution of fault current in several offered conductor ways and the potential distribution on the ground, simultaneously. To solve the complex equations system, the methodology adopted was that described by Mesquita [3]. . [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 132-135] |
| Author(s): | H. O. Brodskyn, M. C. Costa, J. R.Cardoso, N. M. Abe, A. Passaro, H. O. Brodskyn, M. C. Costa, J. R.Cardoso, N. M. Abe, A. Passaro |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 307 KB |
| Title: | AN INVESTIGATION OF THE SCATTERING OF SURFACE WAVES AT DIELECTRIC SLAB WAVEGUIDE WITH AXIAL DISCONTINUITY |
| Abstract: | This paper introduces a technique for studying the radiation due to an abrupt axial discontinuity in the geometry of a planar dielectric waveguide (Slab waveguide) when an even TM surface wave strikes the discontinuity. The mode matching technique is applied at the discontinu- ity giving rise to formally exact integral equations which are solved by the Method of Moments. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 136-141] |
| Author(s): | Creso S. Da Rocha, Creso S. Da Rocha |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 394 KB |
| Title: | ADAPTIVE MESHING IN TWO-VARIABLE STATIC PROBLEMS WITH FIELD BASED ERROR ESTIMATORS USING EDGE AND FACET ELEMENTS |
| Abstract: | In this paper a family of field-based error estimators for Finite Element analysis of electrostatic and magnetostatic problems in plane and axisymmetric geometries is presented. For the error estimation in magnetostatics, each element is divided in three sub-elements using an edge element approach, whereas for electrostatic problems a subdivision using facet elements is used. The methods and the numerical techniques are described, comparisons with known solutions are performed, some examples of application in cases of practical interest are reported and the obtained results are briefly discussed. . [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 142- 147] |
| Author(s): | P. Girdinio, P. Molfino, G. Molinari, M. Nervi, P. Girdinio, P. Molfino, G. Molinari, M. Nervi |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 491 KB |
| Title: | FINITE ELEMENT MODELLING SCHEMES FOR THE DESIGN AND ANALYSIS OF ELECTRICAL MACHINES |
| Abstract: | Electrical machines are complex objects. We have found that a variety of numerical techniques are required in order to model them using finite elements. We concentrate here on the different formulations which are useful in modelling such devices. Examples of modelling some of these machines using the MEGA package are described. . [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 148- 152] |
| Author(s): | D.Rodger, P.J. Leonard, H.C. Lai, N. Allen, D.Rodger, P.J. Leonard, H.C. Lai, N. Allen |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 494 KB |
| Title: | THREE DIMENSIONAL MAGNETOSTATICS USING THE MAGNETIC VECTOR POTENTIAL WITH NODAL AND EDGE FINITE ELEMENTS |
| Abstract: | In this paper, the three dimensional vector potential magnetostatic problem is solved using nodal and edge finite elements. The influence of the gauge condition A.w=0 in the characteristics of the edge-element generated matrix is analyzed. Three gauge conditions are studied: no gauge, the complete A.w=0 gauge and the incomplete A.w=0 gauge condition. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 153-156] |
| Author(s): | E. J. Silva, R. C. Mesquita Mesquita, E. J. Silva, R. C. Mesquita Mesquita |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 261 KB |
| Title: | A NEW ITERATIVE MOMENT METHOD SOLUTION FOR CONDUCTING BODIES OF REVOLUTION |
| Abstract: | An iterative solution of the combined field integral equation (CFIE) has been obtained for perfectly conducting bodies. The proposed technique avoids the inversion of the moment method (MoM) matrix by using an iterative algorithm which shows fast convergence properties, mainly for large bodies. The algorithm is applied to several 3D problems involving bodies of revolution (BOR). Accurate currents are computed with important speedups over direct MoM solutions. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 6-10] |
| Author(s): | F. Obelleiro, J. L. Rodriguez, A. G. Pino, F. Obelleiro, J. L. Rodriguez, A. G. Pino |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 1 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 319 KB |
| Title: | CALCULATION OF THE FREQUENCY CHARACTERISTICS OF MICROSTRIPS DISCONTINUITIES ON NON-DIAGONAL ANISOTROPIC SUBSTRATES USING FDTD |
| Abstract: | This paper describes modifications of the conventional finite-difference time-domain (FDTD) method to the full-wave analysis of frequency dependent characteristics of microstrips discontinuities on non-diagonal anisotropic substrates. The application of the conventional FDTD is limited to materials with diagonal-anisotropic material matrices. In this paper it is shown that this restriction can be removed: First, steps for obtaining the FDTD equations for the analysis of microstrips discontinuities on substrates with fully anisotropic permittivity matrices are derived. Then, using the Fourier transform of the computed results in the time-domain, the scattering parameters as functions of the frequency are calculated for several examples. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 11-15] |
| Author(s): | S. M. Chehrehrazi, A. R. Baghai-Wadji, S. M. Chehrehrazi, A. R. Baghai-Wadji |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 351 KB |
| Title: | ELECTROMAGNETIC WAVES IN A NONLINEAR DISPERSIVE SLAB |
| Abstract: | The electromagnetic scattering of a normal incident plane wave from a strongly nonlinear and dispersive dielectric slab is considered. The dynamics of the polarization density vector are described through a forced nonlinear ordinary differential equation of Duffing type, which takes both dispersive and nonlinear effects into account. The aim of the paper is to study the behaviour of the electromagnetic fields by using the Galerkin method. In particular it is shown that shock waves with infinite slope cannot be developed in real media because of the dispersion . [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering pp 16-19] |
| Author(s): | G. Miano, C. Serpico, L. Verolino, G. Panariello, G. Miano, C. Serpico, L. Verolino, G. Panariello |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 281 KB |
| Title: | SENSITIVITY ANALYSIS USING HIGH ORDER DERIVATIVES |
| Abstract: | In this article, we present a method of sensitivity analysis based on high order derivatives and Taylor expansion. The principle is to find a polynomial approximation of the finite element solution in terms of the sensitivity parameters. We present this method on two dimensional linear magnetostatic and linear magnetodynamic problems. The sensitivity parameters can be either physical parameters or geometric ones. Once the high order derivatives are found, the Taylor expansion allows evaluations for a new set of parameters. The time needed to obtain a new solution is negligible compared to a standard finite element re-analysis. This implies a dramatic change in the use of computational tools. Moreover, the availability of fast evaluations allows a wide use of optimization algorithms. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 20-25] |
| Author(s): | J. L. Coulomb, P. Petin, L. Saludjian, N. Nguyen Thanh, R. Pacaut, J. L. Coulomb, P. Petin, L. Saludjian, N. Nguyen Thanh, R. Pacaut |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 499 KB |
| Title: | OPTIMISATION OF THE SHAPE OF THE FERROMAGNETIC CORE OF FLUXSET TYPE MAGNETIC FIELD SENSORS |
| Abstract: | A method is presented for the optimisation of the shape of the ferromagnetic core of fluxset type magnetic filed sensors. The objective of the optimisation is to find a core shape that guarantees the most homogeneous magnetisation of the core due to a given external magnetic field. By finding the optimal shape of the core the sensitivity of the sensor is improved. Since the thickness of the ferromagnetic conducting ribbon core used for fluxset sensors is considerably smaller than its other dimensions, the presence of the core is modelled by magnetic and conducting surface currents flowing in a mathematical surface representing the core. The electromagnetic field is calculated by solving an integral equation derived from the assumption of impedance type boundary conditions on the two sides of this surface. The core shape is optimised by minimising the magnetisation differences at different locations of the core. Simulated annealing procedure is used for the optimisation. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 32-37] |
| Author(s): | Jozsef Pavo, Jozsef Pavo |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 671 KB |
| Title: | NUMERICAL TECHNIQUES FOR THE INVERSION OF EDDY CURRENT TESTING DATA |
| Abstract: | In this paper, we discuss two techniques for the reconstruction of conductivity profiles in the low frequency limit. The first one is based on the second order approximation of the scattered field operator. In the second procedure, the problem is linearized at the expense of an increase in the number of unknowns including, in this case, the current density and the electric field. Some simple 2D examples are presented to point out and compare the main features of the two approaches. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 38-43] |
| Author(s): | Guglielmo Rubinacci, Antonello Tamburrino, Guglielmo Rubinacci, Antonello Tamburrino |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 573 KB |
| Title: | MAGNETIC MATERIAL PROPERTY IDENTIFICATION USING NEURAL NETWORKS |
| Abstract: | In the numerical solution of field problems for many devices, the modeling of the hysteresis properties of a material is extremely important. While considerable work has been published on models for handling this behavior, it is still difficult to obtain the parameters for these models from measured data. This paper proposes the use a neural network for this operation. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 44-49] |
| Author(s): | Hamadou H. Saliah, David A. Lowther, Hamadou H. Saliah, David A. Lowther |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 561 KB |
| Title: | RECONSTRUCTION OF INHOMOGENEOUS LOSSY DIELECTRIC OBJECTS IN ONE DIMENSION |
| Abstract: | The 1D inverse scattering problem of reconstructing the material properties of an inhomogeneous lossy dielectric slab is considered. The material properties are reconstructed using scattering data from time harmonic electromagnetic plane waves. The incident plane waves are either TE or TM polarized. The inverse scattering problem formulated as a nonlinear optimization problem by means of integral equations is numerically solved using an iterative scheme and Tikhonov regularization. Numerical examples with both types of polarization are presented. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 54-59] |
| Author(s): | W. Rieger, M. Haas, C. Huber, G. Lehner, W.M. Rucker, W. Rieger, M. Haas, C. Huber, G. Lehner, W.M. Rucker |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 506 KB |
| Title: | LAGRANGIAN BEM-FEM SOLUTION OF ELECTROMAGNETIC-MECHANICAL COUPLED PROBLEMS |
| Abstract: | In the framework of the electro-mechanical coupled problems, the coupling between the magnetic diffusion and the elastic deformation equations is treated numerically. A mixed BEM-FEM approach for the electromagnetic part, and a FEM approach for the mechanical part, are proposed. Advantages are taken from a Lagrangian formulation of the problem. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 60-65] |
| Author(s): | A. Formisano, R. Martone, F. Villone, A. Formisano, R. Martone, F. Villone |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 436 KB |
| Title: | MODELLING OF DEGAUSSING COILS EFFECTS ON SHIPS |
| Abstract: | This paper presents our work on magnetic modelling of ships, especially their degaussing coils. We first focus on these coils effects in the FEM computations. The main reason of bad results is a locally inadequate mesh. We propose a method named " reduced potential jump" to avoid the use of a very fine mesh. Then, comparison of results is presented for a simple geometry. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 66-70] |
| Author(s): | F. Le Dorze, J. P. Bongiraud, J. L. Coulomb, G. Meunier, X. Brunotte, F. Le Dorze, J. P. Bongiraud, J. L. Coulomb, G. Meunier, X. Brunotte |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 302 KB |
| Title: | A THREE-DIMENSIONAL ANALYSIS OF MAGNETIC SHIELDING WITH THIN LAYERS |
| Abstract: | This paper describes a numerical method for the analysis of the magnetic shielding with thin layers in three dimensional, time-harmonic magnetic fields. In this method, FEM is employed to solve a couple of differential equations which express the surface impedance of the thin shielding materials. The magnetic fields in air regions are modeled by means of BEM. The above formulations are coupled to evaluate the shielding properties. The resultant matrix equation includes unknowns of two times the number of nodal points. This method can analyze not only a shielding system with closed surfaces but also that with open surfaces without |
| Author(s): | H. Igarashi, T. Honma, A. Kost, H. Igarashi, T. Honma, A. Kost |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 288 KB |
| Title: | A C.A.E. TOOL TO UNDERSTAND MAGNETOSTATICS |
| Abstract: | We present in this paper a Computer Aided Education package allowing to visualize the magnetostatic field in and around the magnetic circuit of a double-U shaped contactor. The modeling of this device is performed by solving in real time a non-linear finite element problem. The imple- mentation of this method is optimized greatly in order to allow to animate field patterns in real time in reaction to any user interaction. An evaluation of the improvements brought by this technique to the learning capabilities of students is presented. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 81-84] |
| Author(s): | F. Buret, D. Muller, A. Nicolas, L. Nicolas, F. Buret, D. Muller, A. Nicolas, L. Nicolas |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 414 KB |
| Title: | NUMERICAL MODELLING OF AN AXIAL-FIELD SOLID DISK INDUCTION MACHINE |
| Abstract: | In this paper a method for the steady-state analysis of an axial-field induction motor with a solid disk rotor is proposed. The boundary condition for the axial component of the magnetic flux density has been calculated by means of an analytical procedure. Accordingly the simulation region is restricted to the air-gap and the rotor. Then the axial component of the diffusion equation is solved for by using a finite difference scheme. Subsequently the azimuthal component of the magnetic flux density and the current density induced in the rotor come out from the field's laws. The validity of the proposed method has been tested by comparing the numerical results with data measured on a double-stator prototype. Finally the numerical procedure has been used for the analysis of the performance of a motor for light vehicle propulsion and the results of the simulation are shown. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 85- 89] |
| Author(s): | Marco Angeli, Nunzio Esposito, Antonino Musolino, Bernardo Tellini, Marco Angeli, Nunzio Esposito, Antonino Musolino, Bernardo Tellini |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 340 KB |
| Title: | MODELLING DYNAMIC HYSTERESIS IN FERROMAGNETIC SHEETS UNDER TIME-PERIODIC SUPPLY CONDITIONS |
| Abstract: | This paper presents an application of the Dynamic Preisach Model as proposed by Bertotti, to the analysis of electromagnetic phenomena inside a ferromagnetic lamination subject to imposed time-periodic magnetic flux. The field problem, considered as one dimensional, is formulated in terms of magnetic field and the Fixed Point technique is used for the treatment of the hysteretic nonlinearity. The solution is carried out in the harmonic domain by means of the Finite Element method. The original implementation of the Dynamic Preisach Model is detailed and comparisons with measurements are presented in the case of sinusoidal excitations. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 90-95] |
| Author(s): | Oriano Bottauscio, Mario Chiampi, Maurizio Repetto, Oriano Bottauscio, Mario Chiampi, Maurizio Repetto |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 463 KB |
| Title: | DYNAMIC OPERATION OF COILS WITH FERROMAGNETIC CORES TAKING MAGNETIC HYSTERESIS INTO ACCOUNT |
| Abstract: | The computation of electromagnetic field diffusion in ferromagnetic and conductive media is coupled to circuit analysis problems, involving coils with iron cores. The classical Preisach model provides the relationship between magnetic field intensity and flux density at the local level, inside the core. Combined with a 2D eddy current simulation, carried out by a time stepping method, the dynamic operation of the core is modelled. The circuit equations are solved taking the effects of hysteresis and skin effects caused by eddy currents induced in core sheets into account. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 96-101] |
| Author(s): | Janos Fuzi, Janos Fuzi |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 433 KB |
| Title: | RESULTS OF PARALLELISATION OF EXISTING ELECTROMAGNETIC FINITE ELEMENT CODES ON SOME DIFFERENT PARALLEL ARCHITECTURES |
| Abstract: | In this paper the results obtained from the parallelisation of some 3D industrial electromagnetic Finite Element codes within the ESPRIT Europort 2 project PARTEL are presented. The basic guidelines for the parallelisation procedure, based on the Bulk Synchronous Parallel approach, are presented and the encouraging results obtained in terms of speed-up on some selected test cases of practical design significance are outlined and discussed. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 107-112] |
| Author(s): | M. Dracopoulos, K. Palrot, G. Molinari, M. Nervi, J. Simkin, M. Dracopoulos, K. Palrot, G. Molinari, M. Nervi, J. Simkin |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 617 KB |
| Title: | THE NEWTON-RAPHSON METHOD FOR COMPLEX EQUATION SYSTEMS |
| Abstract: | A formulation for the complex Newton-Raphson method is proposed. The derivation is obtained on the assumption of a non-analytical system. The method is applied to the finite element calculation of shielding problems with sinusoidal ex-citation and ferromagnetic material. An application example for which measurement data are available is given in order to judge the convergence characteristics and the reliability of the proposed method. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 113-116] |
| Author(s): | Dieter Lederer, Hajime Igarashi, Arnulf Kost, Dieter Lederer, Hajime Igarashi, Arnulf Kost |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 319 KB |
| Title: | SOME ASPECTS OF MAGNETIC FORCE COMPUTATION USING BEM-FEM COUPLING |
| Abstract: | For the calculation of magnetic forces with the Maxwell stress tensor the normal and the tangential derivatives of the vector potential A have to be known. We choose Co-continuous elements, therefore A and its tangential derivatives are continuous. In contrast, the normal derivative A/ n calculated with the finite element method is continuous only in a weak sense. When BEM-FEM coupling is used however, the value of A/ n is uniquely available on the coupling surfaces from the BEM formulation. Two methods of magnetic force computation using A/ n either from FEM or from BEM data will be presented. Their accuracy will be compared by means of several examples. [Vol. 12, No. 2 (1997), pp Special Issue on Numerical Field Calculations in Electrical Engineering, 117-120] |
| Author(s): | Joachim Fetzer, Stefan Kurz, Gunther Lehner, Wolfgang M. Rucker, Joachim Fetzer, Stefan Kurz, Gunther Lehner, Wolfgang M. Rucker |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 270 KB |
| Title: | THE NUMERICAL TREATMENT OF SINGULAR INTEGRALS IN BOUNDARY ELEMENT CALCULATIONS |
| Abstract: | In this paper a general method for the evaluation of singular boundary element integrals over three-dimensional isoparametric boundary elements of higher order is presented. This method permits an efficient integration of strongly singular kernels of order O(1/r2) and of nearly strong singular kernels on curved surfaces. For numerical examples the proposed integration scheme is compared with analytical test examples showing high efficiency and accuracy. This new method has full generality and, therefore, can be applied in any field of electromagnetics. The actual computation can be easily included in any existing computer code, e. g. for the solution of electromagnetic scattering problems. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 121-126] |
| Author(s): | C.J. Huber, W. Rieger. M. Haas, W.M. Rucker, C.J. Huber, W. Rieger. M. Haas, W.M. Rucker |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 416 KB |
| Title: | MODELLING EDDY CURRENTS INDUCED BY ROTATING SYSTEMS |
| Abstract: | As part of a Japanese funded project, a transient eddy current code is being extended to allow for rotational systems. By allowing the system to rotate, induced eddy currents must be modelled. The system being developed uses the "lock-step" approach to model the rotation. As other facilities are included (non-linear materials for example), the solution time of the final code becomes sufficiently large that special care must be taken, and investigations into using parallel hardware becomes necessary. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 131-134] |
| Author(s): | C. R. I. Emson, C. P. Riley, D. A. Walsh, C. R. I. Emson, C. P. Riley, D. A. Walsh |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 412 KB |
| Title: | BEM-FEM COUPLING IN ELECTROMECHANICS: A 2-D WATCH STEPPING MOTOR DRIVEN BY A THIN WIRE COIL |
| Abstract: | This paper deals with the transient numerical analysis of 2-d electromechanical devices driven by thin wire coils. Their dynamical behavior is described by the Maxwell equations, by the constitutive relations, and by the equations of motion. For the solution of the electromagnetic problem the BEM-FEM coupling method is used. A two- dimensional watch stepping motor is presented as an example. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 135-139] |
| Author(s): | Stefan Kurz, Joachim Fetzer, Thomas Kube, Gunther Lehner, Wolfgang M. Rucker, Stefan Kurz, Joachim Fetzer, Thomas Kube, Gunther Lehner, Wolfgang M. Rucker |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 389 KB |
| Title: | HYBRID FORMULATIONS FOR 3D MAGNETOSTATIC AND EDDY CURRENT PROBLEMS |
| Abstract: | Hybrid formulations for solving nonlinear 3D magnetostatic and eddy current problems in terms of magnetic field H are presented. In the pro- posed formulations integral operators are utilized as if the boundary conditions for a partial differential equation were solved within the system of equations. A good correspondence between the results of the presented methods and measurements or other methods is obtained for some test problems. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 140-144] |
| Author(s): | Kimmo Forsman, Lauri Kettunen, Kimmo Forsman, Lauri Kettunen |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 2 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 470 KB |
| Title: | DOMAIN DECOMPOSITION STRATEGIES FOR SOLVING THE MAXWELL EQUATIONS ON DISTRIBUTED PARALLEL ARCHITECTURES |
| Abstract: | Domain decomposition strategies for solving hyperbolic systems of partial differential equations on distributed-memory parallel computing platforms are investigated. The logically-rectangular computational domain is divided either one, two, or three dimensionally into a series of computational blocks, and each block is assigned to a single processor. Theoretical predictions using standard parallel performance models indicate that higher-dimensional decompositions provide superior parallel program performance in terms of scalability. The theory is tested using a finite-volume time-domain (FVTD) Maxwell equations solver to compute the electromagnetic fields inside a rectangular waveguide using various grid sizes and processor numbers on three different parallel architectures- the Intel Paragon, the IBM SP2, and the Cray T3D. The specific performance of the FVTD algorithm on the three machines is investigated, the relation between processor connection topology and message passing performance of a typical grid-based hyperbolic equation solver are identified, and the results are used to augment the classical parallel performance model. Although clear performance trends emerge in terms of the dimensionality of the decomposition, results indicate that higher-dimensional decompositions do not always provide superior parallel performance. [Vol. 12, No. 3 (1997), pp 4-15] |
| Author(s): | Douglas C. Blake, Thomas A. Buter, Douglas C. Blake, Thomas A. Buter |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 3 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 892 KB |
| Title: | MOMENT METHOD SURFACE PATCH AND WIRE GRID ACCURACY IN THE COMPUTATION OF NEAR FIELDS |
| Abstract: | The accuracy of surface patch and wire grid moment method models for the of near fields is investigated. A sphere and a flat plate with plane wave illumination are examined. It is found that wire grids exhibit stronger near field anomalies than surface patches, which have the current more distributed over the surface. Nevertheless, good results can be obtained with a wire grid, provided that a small distance from the wire grid surface is maintained The surface patch results are obtained using the Junction code. Wire grid results are with both the MBC and NEC codes. Validation the sphere is by comparison with an exact solution obtained from the NECBSC code. [Vol. 12, No. 3 (1997), pp 16-25] |
| Author(s): | Robert Paknys, Leslie R. Raschkowan, Robert Paknys, Leslie R. Raschkowan |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 3 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 578 KB |
| Title: | FINITE-DIFFERENCE TIME-DOMAIN MODELING OF LIGHT-TRAPPING IN SOLAR CELLS |
| Abstract: | To maximize light-trapping, the absorption of light in the solar cell is maximized. The ways to increase light-trapping are to texture the surfaces of the solar cell and to use anti-reflection coatings. The power spectrum of sunlight also plays an important role in light-trapping. In general, a solar cell consists of multiple layers of dielectric materials. Each dielectric has a complicated surface texture geometry to increase light-trapping. This paper concentrates on solving Maxwell's equations for the general solar cell configuration under illumination from the sun. The absorption and maximum achievable current density are calculated and used to quantify light-trapping in a given solar cell design. Thin solar cells promise to yield higher current collection than thick solar cells at a lower cost [1]. Low cost solar cells are usually characterized by short diffusion length semiconductors. Most minority carriers created within the distance equal to the diffusion length contribute to the electrical current of a solar cell. Hence, the solar cell must be thin when low quality materials are used. As solar cells decrease in size, the ray-trace model becomes inaccurate as previously demonstrated in [2]. A full-wave Finite-Difference Time-Domain (FDTD) light-trapping model is demonstrated to accurately study light-trapping of thin-film solar cells. [Vol. 12, No. 3 (1997), pp 31-42] |
| Author(s): | Todd Marshall, Melinda Piket-May, Todd Marshall, Melinda Piket-May |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 3 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 872 KB |
| Title: | MODELLING EDDY CURRENTS IN UNBOUNDED STRUCTURES USING THE IMPEDANCE METHOD |
| Abstract: | In this paper extensions to the impedance network method are presented. In particular the method has been applied to problems with boundaries extending to infinity. The infinite boundary condition can also be applied to lines of symmetry in the given geometry. Two dimensional surface models have been verified by comparison of numerical and experimental results in which the potential was measured along the edge of copper sheeting of various shapes located in a uniform, quasi-static magnetic field. The method has potential for modelling three dimensional structures including anisotropic earth planes, arbitrarily shaped buried objects, and both finite and infinitely long faults, dykes, pipes, cylinders and cracks. [Vol. 12, No. 3 (1997), pp 43-49] |
| Author(s): | Daniel James Daniel James, David V. Thiel, Daniel James Daniel James, David V. Thiel |
| File Type: | Journal Paper |
| Issue: | Volume: 12 Number: 3 Year: 1997 |
| Download Link: | Click here to download PDF File Size: 479 KB |
| Title: | ERROR CONTROL IN NUMERICAL SOLUTIONS OF BOUNDARY INTEGRAL EQUATIONS |
| Abstract: | A method of estimating the error committed in numerical solutions of integral equations is presented. It is shown how the error can be computed in spaces other than L^2, why this is reasonable and sometimes necessary. The appropriate function spaces are also shown to lead to bounded condition numbers even for first kind equations. [Vol. 11, No. 1 (1996), pp 32-36, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | G . C . HSIAO, R. E . R. E . KLEINMAN, G . C . HSIAO, R. E . R. E . KLEINMAN |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 386 KB |
| Title: | CALCULATIONS IN MATHEMATICA ON LOW-FREQUENCY DIFFRACTION BY A CIRCULAR DISK |
| Abstract: | This paper is devoted to the symbolic calculation of the scattering coefficient in diffraction by a circular disk, by the use of Mathematica. Three diffraction problems are considered: scalar diffraction by an acoustically soft disk, scalar diffraction by an acoustically hard disk, and electromagnetic diffraction by a perfectly conducting disk. In the low-frequency approximation, the solutions of these problems are in the form of expansions in powers of ka, where a is the radius of the disk and k is the wave number. The emphasis is on the low-frequency expansion for the scattering coefficient, of which several terms are determined exactly with the help of Mathematica. [Vol. 11, No. 1 (1996), pp 47-56, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | J. Boersma, M. J. H. Anthonissen, J. Boersma, M. J. H. Anthonissen |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 597 KB |
| Title: | SCATTERING BY LARGE STRUCTURES WITH PERIODIC SURFACES: A PROTOTYPE PROBLEM |
| Abstract: | A hybrid method which uses both numerical and asymptotic techniques is described and applied to the scattering of an electromagnetic wave off a large corrugated circular cylinder. The radius of the cylinder is large compared to the wavelength of the incident radiation, but the corrugation height and period are of the same order as the wavelength. This problem is a prototype of a more general situation where the surface of a target is covered with a periodic coating. The method of attack essentially blends boundary layer theory, which describes the local scattering behavior of the surface, and the theory of geometrical optics which gives a global description of the scattering. Although the hybrid method is only developed here for this simple model, its applicability for other targets is clear. [Vol. 11, No. 1 (1996), pp 57-62, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics] |
| Author(s): | G.A. Kriegsmann, G.A. Kriegsmann |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 1 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 428 KB |
| Title: | ANALYSIS OF THE FINITE ELEMENT RADIATION MODEL CODE FOR ANTENNA MODELING |
| Abstract: | The Finite Element Radiation Model (FERM) code is applied to examine radiation patterns and input impedance of various antenna con- figurations on complex helicopters. This paper addresses the strengths and weaknesses of the FERM code when applied in antenna analysis and is compared with other national codes, such as the Numerical Electromagnetics Code (NEC). In addition, guidelines are outlined for various applications of the code. [Vol. 11, No. 2 (1996), pp 4-13] |
| Author(s): | Marcos C. Medina, Constantine A. Balanis, Jian Peng, Panayiotis A. Tirkc Panayiotis A. Tirkc, Marcos C. Medina, Constantine A. Balanis, Jian Peng, Panayiotis A. Tirkc Panayiotis A. Tirkc |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 702 KB |
| Title: | ACCURACY OF THE FINITE ELEMENT METHOD WITH SECOND ORDER ABSORBING BOUNDARY CONDITIONS FOR THE SOLUTION OF APERTURE RADIATION PROBLEM |
| Abstract: | The Finite Element Method with second order Absorbing Boundary Condition is a recently developed computational technique that finds use in antenna design and Electromagnetic Compatibility simulation. To determine the accuracy of this new procedure, the problem of aperture radiation was studied. The near zone and aperture fields of a waveguide antenna computed using the Finite Element Method are compared with published data and results found using other simulation techniques. These comparisons show that the new method is accurate even when the ABC boundary conforms to the problem geometry and is placed as near as /2pi to the aperture. [Vol. 11, No. 2 (1996), pp 14-23] |
| Author(s): | John Silvestro, Xingchao Yuan, Zoltan Cendes, John Silvestro, Xingchao Yuan, Zoltan Cendes |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 580 KB |
| Title: | A MOMENT METHOD FORMULATION FOR THE ANALYSIS OF WIRE ANTENNAS ATTACHED TO ARBITRARY CONDUCTING BODIES DEFINED BY PARAMETRlC SURFACE |
| Abstract: | A Moment Method (MM) technique for the analysis of wire antennas on board resonant-sized bodies modelled with parametric surfaces is presented. The approach may have useful applications for the study of the behaviour of wire antennas on board complex conducting structures like aircrafts. The current is represented by curved rooftop functions on the body, piecewise linear functions on the wires and a new junction function in the attachment region between the body and the antenna. The bodies are precisely defined by means of a small number of NURBS surfaces (Non Uniform Rational B-Splines) and Bezier patches (BP). In addition the new junction function that can be defined over any BP allows the antenna to be attached to any part of the body. Radiation patterns and input impedance calculations for several geometries are presented to show the accuracy of the method. The results are successfully validated when comparisons with measurements or results from other methods are carried out. [Vol. 11, No. 2 (1996), pp 32-39 |
| Author(s): | F. Rivas, L. Valle, M.F. Catedra, F. Rivas, L. Valle, M.F. Catedra |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 534 KB |
| Title: | A POSTERIORI ERROR ESTIMATES FOR TWO-DIMENSIONAL ELECTROMAGNETIC FIELD COMPUTATIONS: BOUNDARY ELEMENTS AND FINITE ELEMENTS |
| Abstract: | A brief summary of the variational boundary-value problem formulation of the 2D finite element/boundary element (FE/BE) method is presented. >From this a posteriori error estimates and error indicators for the FE/BE method are developed and applied to electromagnetic scattering and radiation problems. The results obtained indicate that these error estimates and indicators can be obtained within negligible computational times and can be used successfully to obtain valuable a posteriori accuracy and convergence information regarding the reliability of the FE/BE method solutions. [Vol. 11, No. 2 (1996), pp 40-54] |
| Author(s): | F.J.C. Meyer, D.B. Davidson, F.J.C. Meyer, D.B. Davidson |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 1233 KB |
| Title: | MODELLING OF AN ARBITRARILY-ORIENTED MOBILE TELEPHONE HANDSET IN THE FINITE-DIFFERENCE TIME-DOMAIN FIELD COMPUTATION METHOD |
| Abstract: | The implementation of a generic mobile telephone handset model in the Finite Difference Time Domain (FDTD) method for computation of electromagnetic field distributions is described. The handset can be rotated about the principal FDTD axes to achieve any orientation. The 'thin wire' technique is used to model the antenna in a way that ensures that its correct electrical length is maintained despite the 'staircasing' effect of the FDTD grid. Computed predictions from the model agree with near-field measurements on a physical realisation of the handset, and accurate near and far fields are calculated for arbitrary orientations of the handset. It is concluded that this wire rotation technique has broad application to problems involving components that are required to move in relation to fixed structures. [Vol. 11, No. 2 (1996), pp 55-65] |
| Author(s): | P.S. Excell, P. Olley, N.N. Jackson, P.S. Excell, P. Olley, N.N. Jackson |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 886 KB |
| Title: | A MAGNETIC FIELD ITERATIVE TECHNIQUE FOR IMPROVING HIGH FREQUENCY PREDICTION METHODS |
| Abstract: | A Magnetic Field Iterative Technique (MFIT) is developed as a technique for improving the results from high frequency based prediction methods. The technique combines the accuracy of low frequency methods with the speed of high frequency methods to develop a contraction mapping based, iterative solver, which is directly parallelizable on current massively parallel processing machines. In this paper, the MFIT is developed from a Magnetic Field Integral Equation (MFIE) and its contraction discussed. Results obtained mapping properties are using the technique and convergence properties are three dimensional perfect illustrations of the technique's presented for both two and electrically conducting (PEC) targets. [Vol. 11, No. 2 (1996), pp 66-71] |
| Author(s): | Daniel D. Reuster, Gary A. Thiele, Paul W. Eloe, Daniel D. Reuster, Gary A. Thiele, Paul W. Eloe |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 1171 KB |
| Title: | MODELING OF REMOTE FIELD EDDY CURRENT TRANSIENT PHENOMENA |
| Abstract: | An integral formulation is presented and used for the analysis of the Remote Field Eddy Current (RFEC) transient phenomena. The model presented allows simple and accurate modeling of RFEC systems in the presence of axisymmetric defects. The method has been validated first by comparison of the computed results with results obtained with an analytical model. Then the method was used to show that the Remote Field effect is mainly due to a direct induction effect rather than propagation effects. The Remote Field effect phenomena are usually analysed using a steady state domain. However, the results obtained here have shown that detection of defects is not due to a steady state phenomenon, but depends mainly on the transient signal. [Vol. 11, No. 2 (1996), pp 72- 75] |
| Author(s): | M. Raugi, N. Ida, M. Raugi, N. Ida |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 297 KB |
| Title: | SOLUTION OF LAPLACE'S EQUATION USING MULTIPLE PATHS METHOD (MPM) |
| Abstract: | A probabilistic method called the multiple paths method (MPM) is presented to solve the potential equation. Unlike other probabilistic techniques there is no need for the generation of a grid resulting in less computation time and simplicity. The method is based on the calculation of the probability of absorption of a particle at a point on the boundary. The random walk is along a "path" which is a line passing through the starting point, where the potential is to be determined. The results show good agreement with other probabilistic methods and numerical techniques. [Vol. 11, No. 3 (1996), pp 4-8 |
| Author(s): | J. Rashed-Mohasselel, M. Fasih, J. Rashed-Mohasselel, M. Fasih |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 349 KB |
| Title: | A NEW DESIGN METHOD FOR LOW SIDELOBE LEVEL LOG-PERIODIC DIPOLE ANTENNAS |
| Abstract: | A new design procedure for log-periodic dipole arrays is presented in this paper. In this method, either the scale factor or the number of dipole elements is selected, after the boom length, and the operating frequency region are specified. The procedure is applied iteratively, in conjunction to the Numerical Electromagnetic Code, to produce a design with low sidelobe levels. With this new procedure, the antenna designer has more control over the boom length; in older techniques, the boom length and the element spacing were dependent on previous calculations, which frequently resulted on unreasonable values Results for several designs are presented, showing the peak gain to peak-sidelobe level ratio, and the antenna gain as a function of frequency, for different scale factors and boom lengths, for a frequency range of 13 to 30 MHz. [Vol. 11, No. 3 (1996), pp 9-15] |
| Author(s): | James K. Breakall, Rafael A. Rodriguez Solis, James K. Breakall, Rafael A. Rodriguez Solis |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 445 KB |
| Title: | NUMERICAL EVALUATION OF SINGULAR INTEGRANDS IN THE APPLICATION OF THE CHARGE SIMULATION METHOD WITH DISTRIBUTED CHARGE DENSITY |
| Abstract: | As it is well known the Charge Simulation Method is a numerical method for the computation of the electric field in three-dimensional problems, based on the concept of the substitution of the electrodic geometry with a series of elementary charge suitably arranged. In this paper we will show a possible, useful way to overpass the difficulties arising in the numerical computations on the integral expression of the electric potential in the contour points where the boundary conditions are imposed, when distributed surface charges are used in the simulation. The numerical approach presented here allows us to evaluate with accuracy the potential coefficients on the metallic surfaces, avoiding the presence of oscillatory numerical solutions in the computation of the electric potential and of the electric field strength around the electrodes, that generally occurs when discrete charges are used in the simulation. [Vol. 11, No. 3 (1996), pp 16-24] |
| Author(s): | Ermanno Cardelli, Loris Faina, Ermanno Cardelli, Loris Faina |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 482 KB |
| Title: | MEASURED RCS POLAR CONTOUR MAPS FOR CODE VALIDATION |
| Abstract: | Measured radar cross-section (RCS) data as a function of the angle of incidence and of the frequency over a wide range provide an excellent basis for code validation. This paper examines the RCS of six targets measured as a function of the angle of incidence of the plane wave, and of the frequency, through and beyond the resonance range of target size. The RCS is presented as a function of frequency and incidence angle using a color contour map in a polar format, with the radius proportional to the frequency. Such polar contour maps exhibit striking patterns to the underlying scattering mechanisms and target geometry. The RCS as a function of incidence angle and frequency is available from the authors for an extensive collection of targets. [Vol. 11, No. 3 (1996), pp 25-43] |
| Author(s): | C.L. Larose, C.W. Trueman, C.L. Larose, C.W. Trueman |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 2808 KB |
| Title: | AN EFFICIENT METHOD OF ANALYSIS OF CO-PLANAR DIPOLE ARRAY ANTENNAS |
| Abstract: | Generalized impedance formulas for non-uniform array configurations based on the improved Circuit Theory (ICT) are presented for the first time in an English text. To further enhance the ICT as an accurate and fast method for evaluations, a new and more com pact closed-form formula is derived to replace a function requiring time intensive numerical integration during the implementation of the of the ICT algorithm in co-planar dipole array antenna evaluations. The resulting ICT computational scheme reduces the required CPU time by a factor of two and has the same order of accuracy as the conventional MoM. The new ICT implementation would be of considerable use as a Computer Aided Design (CAD) tool of co-planar dipole array antennas. [Vol. 11, No. 3 (1996), pp 44-54] |
| Author(s): | A. I. Imoro, N. Inagaki, N. Kikuma, A. I. Imoro, N. Inagaki, N. Kikuma |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 848 KB |
| Title: | AN ALGORITHM FOR SOLUTION OF THE INVERSE ELECTROMAGNETIC LIQUID METAL CONFINEMENT PROBLEM |
| Abstract: | The design of an electromagnetic levitation system for large amounts of liquid metal requires the solution of an inverse field problem. The objective is to calculate the electromagnetic pressure distribution which corresponds to a specific metallo-static head. This paper describes an algorithm for the design of coil systems which will produce the desired pressure distribution. The technique is illustrated by the design of a torroidal levitation system. [Vol. 11, No. 3 (1996), pp 55-62] |
| Author(s): | G.J. Bendzsak, G.J. Bendzsak |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 687 KB |
| Title: | COMPARISON OF MAGNETICALLY INDUCED ELF FIELDS IN HUMANS COMPUTED BY FDTD AND SCALAR POTENTIAL FD CODES |
| Abstract: | This paper presents a detailed numerical comparison of the magnetically-induced extremely low-frequency electric field and current density within an anatomically realistic model of the full human body, as computed using two different numerical techniques. The first technique is a recently-described full-wave quasi-static finite-difference time-domain (FDTD) method. The use of a time-ramped excitation involving pairs of oppositely-directed plane waves allows for the calculation of decoupled magnetic and electric induction in complex heterogeneous bodies, in relatively short (5 ns) simulation times. The second method is an implementation of Stevenson's method applied for isolated conducting bodies. With the lowest-order external magnetic field represented by a vector potential, the lowest-order internal electric field can be represented by a scalar conduction potential, and the magnetically-induced contribution can be calculated in isolation. Both methods have an underlying similarity in their finite-difference approach, but are nevertheless very distinct. Each code was used to calculate the fields, induced by three orthogonal uniform magnetic fields, in a 7.2 mm-resolution human full-body model. Three-dimensional correlation coefficients of better than 99.9998% were observed between current densities computed by the two methods. Individual edge electric fields typically agree to 3 significant digits. [Vol. 11, No. 3 (1996), pp 63-71] |
| Author(s): | Trevor W. Dawson, Jan De Moerloose, Maria A. Stuchly, Trevor W. Dawson, Jan De Moerloose, Maria A. Stuchly |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 693 KB |
| Title: | ANALYTIC VALIDATION OF A THREE-DIMENSIONAL SOLAR-POTENTIAL FINITE- DIFFERENCE CODE FOR LOW-FREQUENCY MAGNETIC INDUCTION |
| Abstract: | This paper presents a detailed comparison of numerical and analytical calculations of the low-frequency electric and current density fields, induced by an applied uniform axial magnetic field, in an equatorially stratified sphere having the conductivity distribution Rho (_)=Rho0e- cos( _) with p {1,2} and > 0. As shown by the analytic solution, the resulting induced fields are fully three-dimensional, and the model therefore serves as a rigorous test of numerical codes The numerical method is a scalar-potential finite-difference scheme based on Stevenson's method for isolated conducting bodies. This computer code was recently shown to provide excellent agreement with results computed independently by a modified Finite-Difference Time-Domain method. Nevertheless, both codes share some underlying similarities, such as their common use of parallelepiped material voxels to represent the conductivity distribution, and of an edge-based staggered to model the electric fields. Therefore, it is of value to compare the numerical results with analytic ones The analytic model has a freely adjustable contrast parameter, and supports both pi and 2pi-periodic conductivity distributions. Numerical and analytical results are compared for several configurations. Full three-dimensional volumetric correlation coefficients are typically of the order of 99% or better. As might be expected, the main differences occur at the surface of the sphere, where the true circumferential fields are most poorly approximated by the staircasing approximation inherent the numerical approximation. [Vol. 11, No. 3 (1996), pp 72-81] |
| Author(s): | Trevor W. Dawson, Maria A. Stuchly, Trevor W. Dawson, Maria A. Stuchly |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 767 KB |
| Title: | THE GRADIENT ASSOCIATED CONJUGATE DIRECTION METHOD |
| Abstract: | A new conjugate direction (CD) based method, GaCD by name, is addressed with its full derivations. Comparison with some commonly used CD methods is made, concluding that the GaCD method is among the best of them, in terms of an assessment number. A practical example is presented in which a waveguide-microstrip transition section is optimized with respect to its transmission parameter S2l. The measurement of the transition agrees very well with the numerical results. [Vol. 11, No. 3 (1996), pp 82-96] |
| Author(s): | Min Zhang, Min Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 3 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 1873 KB |
| Title: | A SURFACE INTEGRAL EQUATION FORMULATION FOR LOW CONTRAST SCATTERERS BASED ON RADIATION CURRENTS |
| Abstract: | A new surface integral equation formulation based on radiation currents is presented. Numerical problems have been observed when treating low contrast scatterers with surface integral equation formulations based on the total equivalent currents. These problems result because the total equivalent currents are large compared with the radiation currents for low contrast materials. The surface integral equation formulation presented here avoids this problem by solving directly for the radiation currents. [Vol. 10, No. 1 (1995), pp 15-18] |
| Author(s): | Paul M. Goggans, Allen W. Glisson, Paul M. Goggans, Allen W. Glisson |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 423 KB |
| Title: | THE MEASURED EQUATION OF INVARIANCE METHOD APPLIED TO RANDOMLY ROUGH SURFACES |
| Abstract: | The Measured Equation of Invariance (MEI) method has received considerable attention recently. Unlike more traditional numerical techniques, MEI solutions are obtained by inversion of a relatively small and sparse matrix. Therefore, the MEI method can potentially provide a solution much more quickly than other techniques. To date, the MEI method has been applied primarily to discrete objects. In this paper, bistatic radar cross sections for one-dimensional, perfectly conducting, randomly rough surfaces are obtained using the MEI method. The implementation suitable for this problem requires some modification and enhancement of the original algorithm to achieve the desired accuracy. These algorithmic changes can be applied to the discrete scattering problem as well. Monte Carlo results for the bistatic scattering cross section for surfaces with Gaussian statistics and satisfying a Gaussian roughness spectrum are compared to those from another technique and excellent agreement is obtained. [Vol. 10, No. 1 (1995), pp 19-30] |
| Author(s): | John B. Schneider, Shira Lynn Broschat, John B. Schneider, Shira Lynn Broschat |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 1519 KB |
| Title: | PERFORMANCE OF A CHARACTERISTIC-BASED, 3-D, TIME-DOMAIN MAXWELL EQUATIONS SOLVER ON THE INTEL TOUCHSTONE DELTA |
| Abstract: | A characteristic-based, windward numerical procedure for solving three-dimensional Maxwell equations in the time domain has been successfully ported to the Intel Touchstone Delta multicomputer. The numerical results by concurrent computation duplicated the earlier simulations of an oscillating electric dipole on a vector processor and compared well with the exact solutions. The parallelized code is scalable up to 512 nodes and incurs only up to 7.6% performance degradation. The sustained data processing rate is clocked at 6.551 Gigaops. However, the data I/O process is unscalable on the shared memory system. [Vol. 10, No. 1 (1995), pp 52-62] |
| Author(s): | J. S. Shang, Kueichien C. Hill, Donald A. Calahan, J. S. Shang, Kueichien C. Hill, Donald A. Calahan |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 1094 KB |
| Title: | ON THE APPLICABILITY OF THE BICONJUGATE GRADIENT FFT METHOD FOR THE THIN CONDUCTING PLATE PROBLEM |
| Abstract: | The application of the Biconjugate Gradient FFT method to the thin conducting plate problem is investigated. Upon comparing with a Conjugate Gradient FFT method, it is found that the Biconjugate Gradient solution requires a relatively larger error tolerance to achieve a comparatively well-behaved current distribution. Coupled with the requirement of only one matrix-vector product per iteration, the computational cost of the Biconjugate Gradient method is, thus, much smaller than those previously reported in the literature. Of particular importance is the use of the incident electric field as a starting estimate to alleviate the non-convergence behaviour which is usually associated with the application of a Biconjugate Gradient approach to conducting plates at grazing angle. For other angles of incidence, it is shown that this procedure also accelerates the resulting convergence rates as compared to those obtained by simply using zero as an initial estimate. [Vol. 10, No. 1 (1995), pp 63-68] |
| Author(s): | T. V. TRAN, A. McCOWEN, T. V. TRAN, A. McCOWEN |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 1 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 702 KB |
| Title: | REVISED INTEGRATION METHODS IN A GALERKIN BOR PROCEDURE |
| Abstract: | Several relatively simple numerical changes improve the speed and accuracy of the early Mautz and Harrington discretization procedure for boundary element method calculations of scattering from axially symmetric bodies. This method is still in common use in programs such as CICERO and GRMBOR. For a fixed set of geometry points, changes in the azimuthal (o) integration reduce computer time, especially when lossy materials are involved. Changes in the integration along the generating curve (t) improve accuracy. The most interesting of these is the use of the equal area rule from parallel wire modeling of solid surfaces to answer the old question of the optimal constant for dealing with an integrable singularity in some of the t integrals. Some of these changes are applicable to a variety of integral equations and boundary conditions. Most of them can be implemented with little programming effort. Tests are shown for difficult cases involving spheres, and Mie series calculations are used for comparison. [Vol. 10, No. 2 (1995), pp 5-16] |
| Author(s): | David R. Ingham, David R. Ingham |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 886 KB |
| Title: | HIGHER-ORDER FDTD METHODS FOR LARGE PROBLEMS |
| Abstract: | The Finite-Difference Time-Domain (FDTD) algorithm provides a simple and efficient means of solving Maxwell's equations for a wide variety of problems. In Yee's uniform grid FDTD algorithm the derivatives in Maxwell's curl equations are replaced by central difference approximations. Unfortunately, numerical dispersion and grid anisotropy are inherent to FDTD methods. For large computational domains, e.g., ones that have at least one dimension forty wavelengths or larger, phase errors from dispersion and grid anisotropy in the Yee algorithm (YA) can be significant unless a small spatial discretization is used. For such problems, the amount of data that must be stored and calculated at each iteration can lead to prohibitive memory requirements and high computational cost. To decrease the expense of FDTD simulations for large scattering problems two higher-order methods have been derived and are reported here. One method is second-order in time and fourth-order in space (2-4); the other is second-order in time and sixth-order in space (2-6). Both methods decrease grid anisotropy and have less dispersion than the YA at a set discretization. Also, both permit a coarser discretization than the YA for a given error bound. To compare the accuracy of the YA and higher-order methods both transient and CW simulations have been performed at a set discretization. In general, it has been found that the higher-order methods are more accurate than the YA due to the reduced grid anisotropy and dispersion. However, the higher-order methods are not as accurate as the YA for the simulation of surface waves. This is attributed to the larger spatial stencil used in calculating the fields for the higher-order methods. More research is needed to examine the accuracy of higher-order methods at material boundaries. [Vol. 10, No. 2 (1995), pp 17-29] |
| Author(s): | Charles W. Manry Jr, Shira L. Broschat, John B. Schneider, Charles W. Manry Jr, Shira L. Broschat, John B. Schneider |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 1102 KB |
| Title: | A NUMERICAL TECHNIQUE TO DETERMINE ANTENNA PHASE CENTER LOCATION FROM COMPUTED OR MEASURED PHASE DATA |
| Abstract: | In many antenna applications, it is a requirement to have knowledge of the antenna phase center properties. Many interpretations of antenna phase center and its apparent location exist. This paper will present a formulation for determination of antenna phase center location derived using the antenna phase response. A fortran program, developed from the formulations, is used to calculate phase center location for several examples which include both computed and simulated measured phase data. A simple numerical technique is presented that processes measured phase data allowing accurate phase center determination. [Vol. 10, No. 2 (1995), pp 46-62] |
| Author(s): | Steven R. Best, James M. Tranquilla, Steven R. Best, James M. Tranquilla |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 1044 KB |
| Title: | CONFORMAL ARRAY DESIGN SOFTWARE |
| Abstract: | A powerful conformal array design computer program can be developed by modification of a physical optics based array fed reflector analysis computer program. [Vol. 10, No. 2 (1995), pp 63-74] |
| Author(s): | H.K. Schuman, H.K. Schuman |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 556 KB |
| Title: | COMPARISON OF THE INPUT IMPEDANCE OF MONOPOLE ANTENNAS OBTAINED BY NEC, MINlNEC, AND MEASUREMENTS |
| Abstract: | This paper compares the input impedance of monopole antennas numerically calculated by NEC and MININEC with experimental results. This comparison determines the limitation of these two computer codes used for modeling more complicated structures. Two groups of monopoles are considered. The first group consists of eight electrically thin monopoles of length .28 meters (.235 wavelengths at 252 MHz) and radii of .4064, . 7874, 1.168, 1.562, 2.390, 3.162, 6.350, and 7.920 millimeters (.341E-3, .661E-3, .981E-3, 1.31E-3, 2.01E-3, 2.66E-3, 5.33E-3, and 6.65E-3 wavelengths at 252 MHz). For this group, impedance calculations were compared to measurements over the band of 237-267 MHz. The second group consists of five electrically thick monopoles of length .2 wavelengths and radii of .0509, .0635, .0847, .1129, and .1270 wavelengths. For the second group impedance calculations were compared with measurements of tubular monopoles with flat ends. The results of this paper show that the extended kernel option of NEC predicted measured monopole impedance measurements more accurately than MININEC. [Vol. 10, No. 2 (1995), pp 75-85] |
| Author(s): | R. J. Bauerle, J. K. Breakall, R. J. Bauerle, J. K. Breakall |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 745 KB |
| Title: | ACCURATE MODELING OF STEPPED-RADII ANTENNAS |
| Abstract: | The LP8, eight element, log periodic antenna made by M2 Enterprises has recently been modeled at Penn State University using both Version 2 and 4 of the Numerical Electromagnetics Code (NEC). The antenna has a steppedradii element construction and operates from 10 to 30 MHz. The stepped-radii element construction is difficult to model using NEC Version 2. To model a stepped-radii antenna with this version, equivalent lengths of constant radii are calculated using another method of moments program called ELNEC. These equivalent lengths replaced the original stepped radii elements of the log periodic antenna during the modeling. Fortunately, NEC Version 4 can simulate the stepped-radii elements directly, which makes the modeling procedure much easier and accurate. Both NEC models show good agreement with the measurements when compared to VSWR measurements. The authors hope that this paper will help others with similar modeling problems who cannot yet obtain NEC Version 4. [Vol. 10, No. 2 (1995), pp 86-95] |
| Author(s): | A. I. Bauerle, J. K. Breakall, A. I. Bauerle, J. K. Breakall |
| File Type: | Journal Paper |
| Issue: | Volume: 10 Number: 2 Year: 1995 |
| Download Link: | Click here to download PDF File Size: 726 KB |
| Title: | Ultrathin Multiband Microwave Absorber based on Electric-field-coupled-LC Resonators |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-G Metamaterials/Metasureface/Periodic Structures Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 690 KB |
| Title: | TWO-DIMENSIONAL COUPLED ELECTROSTATIC-MECHANICAL MODEL FOR RF MEMS SWITCHES |
| Abstract: | Two-dimensional (2-D) coupled electrostatic-mechanical model of RF MEMS switches has been developed, in which the effect of residual stress due to the fabrication process and axial force resulting from the beam stretching have been taken into account. The electrostatic model is based on the application of the finite difference (FD) technique to quasi-static solution of a 2-D plane cut of the MEMS switch structure. The electrostatic model calculates the induced electrostatic force on the membrane due to the applied dc bias voltage. From the resulting electrostatic potential, the force distribution, the switch capacitance, and the beam deformation have been calculated. The computed pull down voltage for different structures agrees well with published data. The developed simulation program combines the electrostatic and mechanical analyses together and gives accurate results in short running time. |
| Author(s): | Ehab K. I. Hamad, Atef Z. Elsherbeni, Amr M. E. Safwat, Abbas S. Omar, Ehab K. I. Hamad, Atef Z. Elsherbeni, Amr M. E. Safwat, Abbas S. Omar |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 1 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 370 KB |
| Title: | Tunable Terahertz Plasmon-Induced Transparency in Resonator-Coupled Dirac Semimetal Waveguides |
| Abstract: | The bulk Dirac semimetal (BDS) is an interesting material, similar to graphene, which can dynamically adjust its optical properties via a variation in its Fermi energy or electrical voltage. In this work, a BDS-based plasmonic device, which enables tunable terahertz plasmon-induced transparency, was proposed and designed. By using the finite element method, the surface plasmon polariton and plasmon-induced transparency of this device were systematically investigated. The results demonstrate that the plasmoninduced transparency of such device can be dynamically tuned by varying its Fermi energy. When the Fermi energy changes from 55 meV to 95 meV, the maximum group delay time of the device increases from 13.2 ps to 21 ps. In the case of a cascading device, the maximum group delay time can be further pushed up to 44.57 ps. The influence of the ambient refractive index on the optical properties of the proposed device was also considered and investigated. |
| Author(s): | D. Wang, J. Yang, W. Wang, L. Yuan, X. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 6 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1609 KB |
| Title: | Triple Fano resonances in plasmonic heptamer nanohole arrays: Symmetric and asymmetric structures |
| File Type: | Conference Paper |
| Issue: | Volume: S08 Design, Analysis and Applications of EM Metasurfaces I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 1046 KB |
| Title: | Transmission through an Arbitrarily Shaped Aperture in a Conducting Plane Separating Air and a Chiral Medium |
| Abstract: | The analysis of chiral materials has been an important subject in computational electromagnetics. In this paper, the method of moments technique is used to solve the problem of transmission through an arbitrarily shaped aperture separating air and a chiral medium. The aperture is in an infinite PEC (perfect electric conductor) plane. The excitation is assumed to be a plane wave in air. The equivalence principle is used to replace the aperture with a conducting surface with an equivalent magnetic current on each side of it. By enforcing the continuity of the tangential components of the total electric and magnetic fields across the aperture, coupled integral equations are obtained. The aperture has been modeled by triangular patches. The equivalent magnetic currents are approximated by linear combinations of expansion functions. The mixed potential formulation for a homogeneous chiral medium is used to obtain the electric and the magnetic fields produced by these expansion functions. The coefficients of these expansion functions are obtained by using the method of moments to solve the coupled integral equations. |
| Author(s): | S. T. Imeci, F. Altunkilic, J. R. Mautz, E. Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 7 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 747 KB |
| Title: | Transmission Line Matrix Method coupled to Integral Equations for simulation of Electromagnetic Interferences |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced EMC Modeling Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 197 KB |
| Title: | Transient Electro-thermal Analysis of the Bipolar Transistor |
| File Type: | Conference Paper |
| Issue: | Volume: S32 Electromagnetic Analysis on Circuits, Antennas, and Systems - I Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 245 KB |
| Title: | Transient Electro-Thermal Analysis of a Common Source Amplifier Circuit with a Physics-based MOSFET Model |
| Abstract: | An algorithm that combines a common source amplifier with the physics-based metal-oxidesemiconductor field effect transistor (MOSFET) model is proposed. By solving the coupled drift-diffusion model equations with spectral element time-domain (SETD) method, the distribution of electron quasi-Fermi potential, hole quasi-Fermi potential and the potential inside the MOSFET is obtained. The corresponding current densities and electric intensities distributed in the device can be used to couple the heat conduction equation. Furthermore, the Kirchhoff laws should be satisfied when the MOSFET device is inserted in the circuit. The Newton-Raphson method is used to solve the nonlinear circuit equations due to the existence of semiconductor devices. The transient electro-thermal characteristics of a common source amplifier circuit have been analyzed, and the numerical results demonstrate the validity of the proposed method. |
| Author(s): | T. Pan, D. Ding, H. Li, X. Cheng |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 7 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1348 KB |
| Title: | Time Domain Modeling of Active Materials |
| File Type: | Conference Paper |
| Issue: | Volume: S48 Computational Nanophotonics: Advanced Numerical Methods and Applications II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 339 KB |
| Title: | Time Domain Analysis of GaAS MESFET Transistors Excited by an Incident Electromagnetic Field |
| Abstract: | A numerical method for the fully distributed modeling of Field Effect Transistor (FET) excited by an incident electromagnetic field using a Finite-Difference Time-Domain (FDTD) method is described. The transistor is modeled using the fully distributed model which consists of a configuration of the conventional equivalent circuit of the transistor and three coupled lines as each distributed element. The distributed source terms represent the coupling with an electromagnetic field in the equation which can be used in the Electromagnetic Interference (EMI) analysis. As a numerical example, the method is applied to a GaAs MESFET and the time domain results are presented. |
| Author(s): | L. Mirzavand, A. Abdipour, R. Mirzavand |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 10 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 637 KB |
| Title: | Three-Dimensional Electromechanical Coupled Analysis for Capacitive RF MEMS Switches |
| File Type: | Conference Paper |
| Issue: | Volume: Novel Modeling Techniques and RF MEMS Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 831 KB |
| Title: | Thermal Simulation of a Conductive Fabric Sheet Subjected to a Lightning-like Current |
| File Type: | Conference Paper |
| Issue: | Volume: S14 Numerical Methods for Diverse Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 432 KB |
| Title: | Thermal Simulation of a Conductive Fabric Sheet Subjected to a Lightning-like Current |
| Abstract: | A sample of electroconductive fabric subjected to a lightning-like current impulse is analyzed in this contribution. A multiphysics simulation is used to calculate the temperature distribution produced by a lightning-like current flowing through the material sample. A decoupled, electromagnetic (EM) and thermal, simulation was conducted for the analysis and is explained in the paper. The scaling factor calculation to represent the energy presented during current impulse tests is also detailed. Numerical results present patterns that agree with experimental tests reported in the literature and represent an additional tool for the phenomena insight. |
| Author(s): | J. J. Pantoja, C. Rivera, J. Cristancho, J. Rodriguez, F. Roman |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1369 KB |
| Title: | Theoretical Study of Different Access Points in coupled Wireless Power Transfer – Powerline Communication Systems |
| Abstract: | In this contribution the authors investigate the possibility of improving the performances of a coupled Wireless Power Transfer (WPT) - Power Line Communications (PLC) system in case the WPT system is characterised by a four coils structure. The main idea is to use the so-called transmitting and receiving coil (the two "inner" coils) as access point for the PLC modems and use the drive and load loops (the two "outer" coils) as usual access point for power transfer. The simulations results show that a wider band for communication is achieved with respect the previously proposed system. |
| Author(s): | S. Barmada, M. Tucci |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 10 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2058 KB |
| Title: | Theoretical and Experimental Analysis of Rectangular Waveguides with Isotropic Chiral Media |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 2 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 238 KB |
| Title: | The scattering of electromagnetic waves from two-dimensional randomly rough perfectly conducting surfaces |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Integral Equation Based Techniques I Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 112 KB |
| Title: | The Finite Element Method in Optimization: The Forking of Already Parallelized Threads on Graphics Processing Units to Realize Speedup |
| File Type: | Conference Paper |
| Issue: | Volume: CAD Models and EM Solvers for Antenna Design Optimization Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 346 KB |
| Title: | THE EFFECTS OF HEAVY CHARGED PARTICLE IRRADIATION OF MOSFET DEVICES |
| Abstract: | lonizing cosmic particle radiation poses a serious threat to electronic devices (such as metal-oxide semiconductor, field effect transistors -- MOSFETs) that are used in outer space. The physical process in which a bombarding ion creates electron-hole pairs in the SiO2 layer of a MOSFET, the subsequent collection of charge at the SiO2-substrate interface and its effect on the operating characteristics of the transistor is modeled with two second order, coupled differential equations. The coupled equations are solved using the finite difference technique known as the Alternating Direction Implicit Method, ADI. Preliminary verification of the computer code was performed using a low energy proton accelerator. The measured change in MOSFET operating characteristics compared favorably with the predicted results. The results show that the damage due to ionizing particles is greatly dependent on the energy of the bombarding particle, its angle of incidence, and the magnitude of the bias applied to the MOSFET. [Vol. 3, No. 2, pp. 119-130 (1988)] |
| Author(s): | Wlilliam Eichinger, Patrlck O'Reilly, Christopher Lehner, Wlilliam Eichinger, Patrlck O'Reilly, Christopher Lehner |
| File Type: | Journal Paper |
| Issue: | Volume: 3 Number: 2 Year: 1988 |
| Download Link: | Click here to download PDF File Size: 966 KB |
| Title: | Terahertz Metasurface for Flexible Band-pass Filter |
| File Type: | Conference Paper |
| Issue: | Volume: 1-SP-4 Metasurfaces/Metamaterials Theory, Design and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 810 KB |
| Title: | Temperature Effects Analysis on Microwave Rectifiers by Field-Circuit Hybrid Multiphysics Simulation |
| Abstract: | This work analyzes the temperature effects on microwave circuits by employing a novel field-circuit hybrid multiphysics simulation. Firstly, the multiphysics simulation is implemented by solving the coupled governing equations including Poisson equations, semiconductor transport equations, and thermodynamic equations; then, the multiphysics simulation is incorporated into circuit analysis; finally, the circuit simulation results are integrated into the finite-difference timedomain (FDTD) simulation by equivalent sources. In this manner, a field-circuit hybrid multiphysics simulation method is presented. Taking two different microwave rectifiers operating at S- and C-band as examples, temperature effects are analyzed by the proposed approach. Simulation results are in good agreement with measured values, demonstrating the accuracy and applicability of the proposed approach. The presented method more suitably reveals the temperature effects on the rectifier. |
| Author(s): | H. Zeng, Y. Chen, C. Zhou, Y. Tang, X. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3509 KB |
| Title: | Systematic CMA of the U-slot Patch with FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: S03 EM Modeling using Feko/WinProp Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 468 KB |
| Title: | Systematic CMA of the U-slot Patch with FEKO |
| Abstract: | Since its introduction 25 years ago, the probe-fed Uslot patch antenna has remained popular. Recently, Characteristic Mode Analysis (CMA) revealed these devices are governed by Coupled Mode Theory (CMT). Although this principle is conceptually simple, achieving this understanding is only possible through a systematic analysis using CMA. This paper uses the Uslot patch to illustrate a general process for analyzing electrically small antennas using CMA with the software package FEKO. |
| Author(s): | J. J. Borchardt |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1615 KB |
| Title: | Synthesis Design of Bandpass Filter for UWB Applications with Improved Selectivity |
| Abstract: | This paper presents the design of UWB threepole modified parallel coupled line bandpass filter with improved rejection in the out-of-band frequencies. To achieve the desired UWB requirements using the conventional bandpass filter design, a physical dimension optimization of space-gap between lines, line widths and lengths was applied. An equivalent circuit model is also presented and demonstrates reasonable agreement with simulation results. The optimized filter demonstrates an excellent UWB performance, covering the Federal Communication Commission spectrum bandwidth with low insertion loss and acceptable selectivity. However, this resulting filter structure presents very small gapping between adjacent resonators; that means the filter is unmanufactured. Then an example of an alternative filter structure is finally proposed with null gaping and shortcircuited stubs that yields to a fabricated prototype with selectivity improvement. Generally speaking, reasonable agreement is achieved between measurement and simulation results. |
| Author(s): | A. Naghar, O. Aghzout, A. V. Alejos, F. Falcone |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 584 KB |
| Title: | Suppressing E-Plane Scan Resonance for UWB Millimeter-Wave Differential Phased Array |
| File Type: | Conference Paper |
| Issue: | Volume: S36 Antennas and Arrays Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 923 KB |
| Title: | Super Wide Band Tunable Microstrip BPF Using Stub Loaded MMR |
| Abstract: | A simpler structure of super wide band (SWB) tunable microstrip band pass filter (BPF) using stub loaded multimode resonator (MMR) is presented here. The MMR is formed by loading a single openended shunt stub at the center with a simple stepped impedance resonator. By incorporating this MMR with two interdigital parallel coupled feed lines, a novel SWB tunable BPF is formed. The BPF is fabricated using FR-4 substrate of 1.6 mm thickness with dielectric constant of 4.4 and simulated using high frequency structure simulator (HFSS) software. The simulated and measured results are in good agreement with each other, with a wide fractional bandwidth (FBW) of 179%. The measured insertion loss is less than -0.9 dB throughout the pass band of 3.1 GHz-15.4 GHz with the return loss higher than 11.5 dB. The group delay of the filter is relatively constant and less than 0.3 ns over the desired pass band. |
| Author(s): | A. Sengupta, S. R. Choudhury, S. Das |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1670 KB |
| Title: | Subwavelength Metallic Grating Simulation Using FDTD |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave, Optical Devices, and Propagation Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 293 KB |
| Title: | Stochastic Collocation for Uncertainty Quantification of Systems Described by Neutral Delayed Differential Equations |
| File Type: | Conference Paper |
| Issue: | Volume: S17 Uncertainty Quantification in CEM Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 366 KB |
| Title: | Spherical Aperture-Coupled Antennas with Parasitic Element |
| Abstract: | Theory and experiment of spherical aperture-coupled antennas with parasitic elements are presented in this paper. Current distributions on slot and conformal patches are calculated using spatial domain electric and magnetic Dyadic Green's Functions (DGFs). Electromagnetic fields for such a structure have been calculated with the aid of linear Rao-Wilton-Glisson (RWG) triangular basis functions and by converting spherical DGFs to Cartesian DGFs. In order to validate the proposed method, a prototype of this antenna is fabricated and tested. The effect of parasitic element on antenna characteristics such as gain and radiation pattern is investigated. Good agreement between the results shows accuracy and high convergence speed of the presented method. |
| Author(s): | J. S. Meiguni, M. Kamyab, A. Hosseinbeig |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 12 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 476 KB |
| Title: | Sonnet Design and Verification of a Wideband Schiffman Phase Shifter Using Edge-Coupled Microstrip Lines |
| File Type: | Conference Paper |
| Issue: | Volume: Student Projects in Sonnet Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 239 KB |
| Title: | Some Advances in Shooting-Bouncing-Rays Asymptotic Propagation Methodologies |
| File Type: | Conference Paper |
| Issue: | Volume: S32 Recent Advances in Asymptotic Methods Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 179 KB |
| Title: | Small Incident Angle Transient Scattering from Shallow Cavities in a Ground Plane |
| File Type: | Conference Paper |
| Issue: | Volume: S59 Frequency and Time Domain Integral Equation Solvers II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 294 KB |
| Title: | Size Reduction and Harmonic Suppression of Parallel Coupled-Line Bandpass Filters Using Defected Ground Structure |
| Abstract: | A novel miniaturized parallel coupledline bandpass filter with suppression of second, third and fourth harmonic frequencies, is demonstrated in this paper. The new filter is based on the slow-wave effect of the Defected Ground Structure (DGS) to achieve size minimization, while the spurious responses are eliminated by the band-rejection property of the DGS unit. These features offer the classical parallel coupled-line bandpass filter simultaneous compactness and wide stopband performance. Using the proposed DGS unit, does not require the filter parameters to be recalculated and, this way, the classical design methodology for microstrip parallel coupled-line filters can still be used. As an example, a 2.0 GHz parallel coupledline filter has been designed and measured in order to show the validity of the proposed DGS. Compared with the conventional parallel coupledline bandpass filters, the second, third and fourth measured spurious responses are suppressed to - 45, -43 and -34 dB, respectively. In addition, the size of the prototype filter is reduced by 20% compared to that of the conventional parallel coupled-line filter. |
| Author(s): | F. Karshenas, A. R. Mallahzadeh, J. Rashed-Mohassel |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 2 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 346 KB |
| Title: | Singly-Fed Circularly Polarized Electromagnetically Coupled Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Analysis and Design of Antennas for Wireless Communications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 215 KB |
| Title: | Single Feed Dual-Polarization Dual-Band Transmitarray for Satellite Applications |
| Abstract: | In this paper, two transmitarrays are designed, analyzed, and simulated for satellite applications. The first transmitarray is designed for dual linear polarization at a center frequency of 12 GHz. The second transmitarray is designed for two frequency bands: 17.15 GHz to 17.9 GHz for vertical polarization and 11.5 GHz to 12.4 GHz for horizontal polarization. The dual polarization is obtained by an independent adjustment of the dimensions of two orthogonal slots in the transmitarray unit cell. The design is carried out independently for each polarization. The transmitarray unit cell uses two dielectric substrate layers arranged to be one on each side of a conducting plane. On each substrate, one face has metallization containing the patches, and the other face has metallization containing the ground plane. The two patches are coupled by two cross slots of lengths LV and LH in the ground plane and each patch is loaded with two cross slots of lengths LV/2 and LH/2. The unit cell achieves 360o of phase agility with less than 3.8 dB of variation in the transmission magnitude in the tuning range. The transmitarray consisted of 17×17 elements with the unit cell size were set at 13 mm. A circular feed horn is located on the central normal to the transmitarray and the configuration looks like a lens antenna. Two separate feeding pins are used to excite the horn antenna for horizontal and vertical polarizations. The results are worked out using two basically different numerical techniques, the finite element method, FEM, and the finite integration technique, FIT. Good agreement was obtained. |
| Author(s): | S. Zainud-Deen, S. Gaber, H. Malhat, K. Awadalla |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 2 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 353 KB |
| Title: | Simulation Study on a 3-dB Quadrature Coupled Structure |
| File Type: | Conference Paper |
| Issue: | Volume: S41 EM Modeling using Sonnet I Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 458 KB |
| Title: | Simulation and Measurement of a Vehicle-based SATCOM On-The-Move Microstrip Electronic Scanning Phased Array |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Simulation-Based Modeling and Design Optimization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 599 KB |
| Title: | Scan Blindness Elimination Using Composite Defected Ground Structures and Edge-coupled Split Ring Resonators |
| Abstract: | A novel compact composite structure, composed of double-U shaped defected ground structure (DGS) and edge-coupled split ring resonator (E-SRR), is presented in this paper. The composite structure is integrated into microstrip array to reduce the interelement mutual coupling, with the aim to eliminate the scan blindness and improve the scanning performance. The three kinds of two-element arrays (without composite structure, with only DGS and with composite structure) are thoroughly simulated, measured, and compared. The results show that, the reduction in mutual coupling of 11 dB between elements in E-plane is obtained with the use of composite structure. It is worth mentioning that, approximately 2dB gain improvement and 2.4dB side lobe suppression are both attained, in comparison with the array with only DGSs. Finally, the scan properties of three kinds of infinite microstrip phased arrays are studied by the waveguide simulator method. The results indicate that the scan blindness in an infinite microstrip phased array can be well eliminated by virtue of the effect of the proposed composite structures, in accordance with results obtained by active patterns of the centre element in 9×5 array. |
| Author(s): | M. C. Tang, S. Xiao, C. J. Li, C. Wei, B. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 7 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1531 KB |
| Title: | Rotated Stacked Yagi Antenna with Circular Polarization for IoT Applications |
| Abstract: | This letter proposes a rotated stacked Yagi antenna with high directivity and circular polarization. The proposed antenna consists of three elements with a rotation angle and different lengths: a director, a reflector, and a driven element connected to the coaxial feeder. The coaxial feeding is connected to the driven element of the proposed antenna via a LC-balun, and the others are coupled with the driven element. Each stacked element with different lengths is equally rotated at an angle of 60° with respect to the lower element so that the dipole array antenna forms a high directive circular polarization. The size of the proposed antenna is 0.49λ0, × 0.49λ0, × 0.17λ0, at 2.45 GHz and achieved a 10 dB impedance bandwidth of 6.3%, a 3 dB axial ratio bandwidth of 8%, and a peak gain of 4.3 dBic. |
| Author(s): | J.-H. Kim, C.-H. Jeong, W.-S. Lee |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1577 KB |
| Title: | Rotated Stacked Yagi Antenna with Circular Polarization for IoT Applications |
| Abstract: | This letter proposes a rotated stacked Yagi antenna with high directivity and circular polarization. The proposed antenna consists of three elements with a rotation angle and different lengths: a director, a reflector, and a driven element connected to the coaxial feeder. The coaxial feeding is connected to the driven element of the proposed antenna via a LC-balun, and the others are coupled with the driven element. Each stacked element with different lengths is equally rotated at an angle of 60° with respect to the lower element so that the dipole array antenna forms a high directive circular polarization. The size of the proposed antenna is 0.49λ0, × 0.49λ0, × 0.17λ0, at 2.45 GHz and achieved a 10 dB impedance bandwidth of 6.3%, a 3 dB axial ratio bandwidth of 8%, and a peak gain of 4.3 dBic. |
| Author(s): | J.-H. Kim, C.-H. Jeong, W.-S. Lee |
| File Type: | Express Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1577 KB |
| Title: | Resonant Inductive WPT Link Operating in a Coupling-independent Regime |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Electromagnetic Techniques for the Internet of Things II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 86 KB |
| Title: | Reduced Models for Parallel-in-Time Simulation of Field/Circuit Coupled Problems |
| File Type: | Conference Paper |
| Issue: | Volume: S04 Model Order Reduction in Computational Electromagnetics Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 160 KB |
| Title: | Reconfigurable Electrically Small Split Ring Resonator Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S41 Antenna Design III Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 535 KB |
| Title: | Recent Advances in Wireless Systems for Simultaneous Power and Data Transfer |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Wireless Power Transfer and Energy Harvesting: Advances in Modelling and Practice Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 87 KB |
| Title: | Realization of Dual Notch Bands in UWB Bandpass Filter Using Two T-shaped Resonators |
| File Type: | Conference Paper |
| Issue: | Volume: S13 Advances in EM Modeling and Optimization From Theory to Applications II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 751 KB |
| Title: | Quad-Band MIMO Antenna System for 5G Mobile Handsets |
| Abstract: | An efficient Multi-Input Multi-Output (MIMO) antenna system with a spatial diversity configuration for the Fifth Generation (5G) mobile handsets is constructed from a compact-size quad-band (28/45/51/56 GHz) microstrip patch antennas. The antenna is constructed as primary and secondary patches which are capacitively coupled and designed to realize impedance matching and to produce appropriate radiation patterns in the four frequency bands. The novel quad-band patch antenna includes complicated radiation mechanisms required for multiple-band operation. Twoport and four-port MIMO antenna systems that employ the quad-band patch antenna are proposed in the present work for the 5G mobile handsets. Numerical and experimental investigations are achieved to assess the performance of both the single-element antenna and the proposed MIMO antenna systems including the return loss at each antenna port and the coupling coefficients between the different ports. It is shown that the simulation results agree with the experimental measurements and both show good performance. The bandwidths achieved around 28, 45, 51, and 56 GHz are about 0.6, 2.0, 1.8, and 1.3 GHz, respectively. The radiation patterns produced when each port is excited alone are shown to be suitable for spatial diversity scheme with high radiation efficiency. It is shown that the envelope correlation coefficient (ECC) and the diversity gain (DG) are perfect over the four frequency bands. |
| Author(s): | M. A. El-Hassan, A. E. Farahat, K. F. A. Hussein |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 11 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1242 KB |
| Title: | Protection of Computer Enclosure against Coupled Electromagnetic Interference |
| Abstract: | In this paper some suggested protection methods is proposed to improve the shielding effectiveness of computer enclosures. Slots and holes on the computer enclosure are divided into five types, and the coupled electromagnetic interference (EMI) into the enclosure is computed using the finite-difference time-domain (FDTD) method when each type slot exists. From comparison of both time domain electric field waveform and field distribution in the enclosure, vent array, joint laps, CD-ROM and display are found to be the main ways that the EMI penetrated into the enclosure. To improve the protection of the enclosure, waveguide window is used to replace vent array. Additionally, rivet number is increased, depth of the joint laps is increased and conductive gaskets are filled into the joint laps. From numerical analyses, it can be demonstrated that the suggested methods are efficient to improve shielding effectiveness of the computer enclosure. Some suggested methods are also proposed for the CD-ROM and display protection. |
| Author(s): | R. Xiong, W. Yang, H.-L. Chen, Y.-T. Duan |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 11 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2782 KB |
| Title: | Properties of the Conformal CSCMR System |
| File Type: | Conference Paper |
| Issue: | Volume: S37 Wireless Power Transfer and Energy Harvesting: Advances in Modelling and Practice Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 391 KB |
| Title: | Predicting Electromagnetic Interference to a Terminated Wire Using Characteristic Mode Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: S06 Antennas and Sensors Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 537 KB |
| Title: | Predicting Electromagnetic Interference to a Terminated Wire Using Characteristic Mode Analysis |
| Abstract: | Electromagnetic coupling to realistic wire configurations exhibit large variations with respect to the frequency, incident angle, and polarization of the interfering signal. In this work, Characteristic Mode Analysis (CMA) is used to calculate the fundamental modes of a terminated wire above an infinite ground plane. Using the properties of the modes, the coupled currents to the wire's loads are predicted for different incident excitations. Using this simple but practical wire configuration, we show the versatility of CMA in practical electromagnetic interference and coupling applications. |
| Author(s): | M. Z. M. Hamdalla, A. N. Caruso, A. M. Hassan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1505 KB |
| Title: | Polarimetric Scattering from a 3-D Rectangular Crack in a PEC Covered by a Dielectric Layer |
| Abstract: | A novel direct approach for calculation of the polarimetric scattering fields from a narrow 3-D rectangular crack in an infinite ground plane underneath a dielectric layer is presented. Since the electromagnetic fields are directly calculated and thus the approach in inversible, this technique is suitable for microwave NDT applications where cracks of narrow width, arbitrary length and depth under a dielectric layer are frequently encountered. A set of coupled field integral equations (FIE) with logarithmic and hypersingular kernels are derived and then descritized by a collocation method based on Chebyshev polynomials. The results of this direct approach are in good agreement with noninversible full numerical FEM and MoM results. |
| Author(s): | M. Bozorgi, A. Tavakoli |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 6 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1808 KB |
| Title: | Phase Control of an Infrared-Frequency Current Wave on a Microstrip Line with dc Diode Bias |
| File Type: | Conference Paper |
| Issue: | Volume: S31 Electromagnetic/Thermal Modeling of Infrared/Optical Antennas Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 404 KB |
| Title: | Patch Antenna Modeling Issues Using Commercial Software |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO – I Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 179 KB |
| Title: | Passive Guaranteed Broadband Equivalent Circuit Derivation of Symmetrical Multi-port Systems: Application to Multi-conductors and RF-Inductors |
| File Type: | Conference Paper |
| Issue: | Volume: Time Domain Methods in Numerical Electromagnetics Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 299 KB |
| Title: | PARALLEL IMPLEMENTATION OF GALERKIN TECHNIQUE IN LARGE SCALE ELECTROMAGNETIC PROBLEMS |
| Abstract: | An intergal equation formulation in conjunction with a palallelised Galerkin technique is employed to solve large-scale electromagnetic (EM) problems. The proposed technique is applicable to EM structures consisting of similar conducting or dielectric parts, defined as "elements". Coupled intergal equations are derived in the frequency domain, written in terms of the conductivity currents or the electric fields deployed on the conducting or dielectric "elements" surfaces, respectively. The system of intergal equations is numerically solved via the parallel computed Galerkin technique, with convienient entire domain basis functions. Even for ellectrically large structures, the use of entire domain basis functions leads to relatively small order linear systems and the main computational cost refers to the matrix fill rather than the matrix solution. The parallalisation introduced to the computation of the matrix elements overcomes the limitation of using Method of Moments at lower and resonant frequencies. The inherent parallelisim of the introduced technique allows for the results to be obtained with minimal addition to sequental code programming effort. Two indicative electromagnetic compatibility applications are presented, concerning the coulping of incident waves with multiple conducting rectangular plates and the coupling phenomena occuring in a multi-element waveguide array looking into a layered lossy cylinder. Numerical results are presented, while the applicability/suitability of diverse High Performance Computing platforms is judged, based on both performance obtained and ease of code portation. |
| Author(s): | D.I. Kaklamani, K.S. Nikita, A. Marsh, D.I. Kaklamani, K.S. Nikita, A. Marsh |
| File Type: | Journal Paper |
| Issue: | Volume: 14 Number: 3 Year: 1999 |
| Download Link: | Click here to download PDF File Size: 808 KB |
| Title: | Overview of Reconfigurable Computing Platforms and Their Applications in Electromagnetics Applications |
| Abstract: | This paper investigates the utilization of field programmable gate arrays (FPGAs) in the acceleration of numerically intensive electromagnetics applications. We investigate the speed improvement by employing FPGAs for two different applications: (i) the optimization of a phased array antenna pattern by amplitude control using the ant colony optimization algorithm, (ii) implementation of the rigorous coupled wave (RCW) analysis technique for the design of engineered materials. The first application utilizes FPGAs as the only processor; i.e., all functionalities of the algorithm reside on the FPGA. The second one employs a hybrid hardware/software approach where the FPGA serves as a coprocessor to the CPU. The hybrid approach identifies the most numerically intensive part of the RCW algorithm and implements it on the FPGA. In both applications we demonstrate orders of magnitude of improvement in speed proving that FPGAs are highly flexible platforms suited well for the challenging electromagnetics problems. An overview of available FPGA platforms for scientific computing and how they compare are also presented in the paper. |
| Author(s): | O. Kilic, M. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 4 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 521 KB |
| Title: | Overset Grid Generation Method for the Study of Electromagnetic Field in Rotating Environment |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 298 KB |
| Title: | Overset Grid Generation Method for the Study of Electromagnetic Field in Rotating Environment |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic-Simulation-Driven-Design: Modeling and Optimization Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 298 KB |
| Title: | Optimization of Wireless Power Transmission Systems with Parasitic Wires |
| Abstract: | We present a rigorous optimization method to design wireless power transmission (WPT) systems. In order to optimize the power coupled to the receiver, reactive parasitic components are integrated into the system. Simulated annealing is implemented in conjunction with the method of moments to determine the optimum parameters for the design. By carefully adjusting the geometry, size, position and properties of the parasitic wires, it could be seen that the peak efficiency and effective distance for power coupling could be significantly improved. The result shows that the implementation of a square parasitic wire gives better performance than a circular one. A WPT system with a square reactive wire gives respectively a 0.79% and 0.07 lambda improvement in peak efficiency and effective distance compared to its zero-impedance counterpart. By inserting two square reactive wires with the transmitter sandwiched in between, the peak efficiency and effective distance are found to have increased respectively by 3.37% and 0.18 lambda, compared to that with a single reactive wire. |
| Author(s): | K. H. Yeap, A. R. C. Cheah, K. Hirasawa, K. C. Yeong, K. C. Lai, H. Nisar |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 9 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1881 KB |
| Title: | Optimization of Aperiodic Waveguide Mode Converters |
| File Type: | Conference Paper |
| Issue: | Volume: CEM for Applied Analysis and Synthesis Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 294 KB |
| Title: | Optimization and Validation of a Highly-coupled, 20-Channel Transmit UHFMRI Head Coil Design |
| File Type: | Conference Paper |
| Issue: | Volume: Computational EM Methods for Design and Safety in Magnetic Resonance Imaging Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 805 KB |
| Title: | Optimisation of the FGT for Electroheat Multiphysics Modelling |
| File Type: | Conference Paper |
| Issue: | Volume: Challenges in Scattering, Radiation and Multi-domain Modeling Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 153 KB |
| Title: | Optimal Range of Coupling Coefficient of Loosely Coupled Transformer Considering System Resistance |
| File Type: | Conference Paper |
| Issue: | Volume: S21 Low Frequency Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 548 KB |
| Title: | Optimal Range of Coupling Coefficient of Loosely Coupled Transformer Considering System Resistance |
| Abstract: | Accurate system resistance may lead to an obvious error between the simulated and the real efficiency of the system. This paper proposes an optimal range of coupling coefficient for ensuring the efficiency and the sufficient output power of the WPT (wireless power transfer) system. A 3-kW prototype WPT system is manufactured and the effectiveness of the optimal range of coupling coefficient is validated. |
| Author(s): | J. Ge, H. H. Eldeeb, K. Liu, J. Kang, H. Zhao, O. Mohammed |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1477 KB |
| Title: | Optimal Design of Conformal Strongly Coupled Magnetic Resonant Systems |
| File Type: | Conference Paper |
| Issue: | Volume: Wireless Powering of Devices & Energy Harvesting Number: Year: 2014 |
| Download Link: | Login To Download (For Members) File Size: 330 KB |
| Title: | Optical Crosstalk Improvement in Ring Resonator Based Add/Drop Multiplexers Using Controllable Reflectivity |
| Abstract: | In this paper, the topic of optical signal integrity is approached by studying crosstalk suppression in ring resonator based optical Add/Drop Multiplexers (OADM). The resonance splitting induced by surface corrugation is exploited to enhance signal integrity by increasing the crosstalk suppression bandwidth compared to that of a smooth-walled resonator. Sidewall roughness in silicon-on-insulator waveguides is studied using Coupled Mode Theory (time and space domain CMT). An analytical model of a corrugated ring resonator is presented, which is then exploited to estimate the spectral response of the different ports. Verification against results generated from full-wave electromagnetic numerical modeling of a randomized corrugated ring is performed. The analysis then examines the performance of an OADM with controllable reflectivity resulting from a predefined corrugation of sidewall. Gratings have been successfully used in optical filters; this paper proposes the use of a grating in an OADM, giving more controlled roughness. A grating-assisted design of a single ring OADM with 28 GHz crosstalk suppression bandwidth is presented. This bandwidth supports the dropping of 10 Gbps signals with mitigated crosstalk levels and improved signal integrity. |
| Author(s): | R. D. Mansoor, A. P. Duffy |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 10 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2913 KB |
| Title: | On the Significance of Current Vector Alignment in Lowering the Resonant Frequency of Fractal and Small Wire Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Antenna Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 75 KB |
| Title: | On the MUSIC-type Electromagnetic Imaging of a Small Collection of 3-D Dielectric Spheres from its Multi-Static Response Matrix using Exact and Asymptotic Numerical Data |
| File Type: | Conference Paper |
| Issue: | Volume: Detection and Imaging: Theoretical, Algorithmic, Technology and System Advances Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 128 KB |
| Title: | On Calculating Transient EM Responses with WIPL-D |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using WIPL-D Characterization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 278 KB |
| Title: | Omega-Shaped Tag Antenna with Inductively-Coupled Feeding Using U-Shaped Stepped-Impedance Resonators for RFID Applications |
| Abstract: | This study proposes a new omega-shaped tag antenna with inductively-coupled feeding (ICF) using U-shaped stepped- impedance resonators (SIRs). It aims at improving the performance of the tag antennas for Radio Frequency Identification (RFID) applications. The radiating body of the antenna is fed using two mirroring symmetrical U-shaped SIRs. This antenna is a simpler alternative for the existing antennas that match the impedance of the antenna to the chip impedance effectively applying varied reinforcement of the equivalent inductance of the radiating structure. In addition to the use of an omega-shaped structure, the proposed feeding technique boosts performance of the antenna impedance, dimensions, and peak gain. The measured size of the antenna was 50×55.55×1.6 mm3. It attains a peak gain of 1.8 dBi and radiation efficiency higher than 85% at its operating frequency. The experimental results revealed that this tag antenna has the characteristic of good impedance matching within the frequency range of 900-940 MHz, corresponding to a better power reflection coefficient of -3 dB. Comparison between the measured and simulated results verified that the proposed feeding method is capable to improve overall performance of RFID tag antennas. |
| Author(s): | A. R. H. Alhawari, A. H. M. Almawgani, H. Alghamdi, A. T. Hindi, T. Saeidi, A. Ismail |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 8 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1877 KB |
| Title: | Numerical Analysis and Preliminary Experimental Validation of a Heteropolar Electrodynamic Bearing |
| Abstract: | In this paper we describe the numerical simulations of a Heteropolar Electrodynamic Bearing and compare them with some experimental data taken on a prototype in quasi-static state. The device is composed of a cylindrical permanent magnet rotor and six coils fixed onto the stator. The system has been simulated by means of a dedicated numerical code (“EN4EM” - Electric Network for Electromagnetics), previously developed for research purposes. The software is based on a 3D integral formulation and it is able to numerically simulate coupled multi-degree of freedom electro/mechanical problems. The comparison between computed and measured data are fully satisfactory. |
| Author(s): | V. Kluyskens, B. Dehez, C. Dumont, A. Musolino, R. Rizzo |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 4 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2237 KB |
| Title: | Novel UWB Trapezoidal and Butterfly Shaped Microstrip Phase Shifters Using Multilayered PCB Technology |
| Abstract: | In this paper, design of two different aperture-coupled phase shifters for ultra-wideband (UWB) multilayer microwave circuits are introduced. The proposed phase shifters use broadside coupling between microstrip patches at the top and the bottom layers via a rectangular-shaped slot in the common ground plane (mid-layer). The proposed patch shapes are trapezoidal and butterfly shapes which are capable of achieving broadband characteristics for UWB operation. The reference transmission line is installed on the top layer. The numerical calculated results using two simulation programs using two different numerical techniques show that the proposed phase shifters have good phase characteristics with high return losses and good insertion losses over most of the 3.1–10.6 GHz frequency band. The phase characteristics for the proposed phase shifters can be easily controlled by proper adjusting the physical dimensions. Two 45° phase shifters prototypes are fabricated and then tested experimentally using Agilent E8364B PNA Network Analyzer. Experimental results are in good agreement with the calculated ones. |
| Author(s): | O. M. Haraz, A.-R. Sebak |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 11 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2185 KB |
| Title: | Novel Monopole Antenna Design for UHF Circularly Polarized RFID Tag Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S03 EM Modelling of Milli Meter Wave Antennas and its Applications - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 496 KB |
| Title: | Normal Mode Splitting with Lossy Coupled Resonances |
| File Type: | Conference Paper |
| Issue: | Volume: S08 Nano-Electromagnetics Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 390 KB |
| Title: | Nonlocal Hydrodynamic Models for the Optical Response of Plasmonic Nanostructures |
| File Type: | Conference Paper |
| Issue: | Volume: S02 Modeling and Applications - I Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 314 KB |
| Title: | Nonlocal Hydrodynamic Models for the Optical Response of Plasmonic Nanostructures |
| Abstract: | In order to model the interaction between light and plasmonic structures at deep-nanometer scale, which is governed by non-classical effects, a nonlocal hydrodynamic approach has been extensively studied. Several hydrodynamic models have been proposed, solving the coupled equations: the linearized hydrodynamic equation of motion and the electrodynamic Maxwell’s equations, by employing additional boundary conditions. This work compares four hydrodynamic models: the hard wall hydrodynamic model (HW-HDM), the curl-free hydrodynamic model (CF-HDM), the shear forces hydrodynamic model (SF-HDM), and the quantum hydrodynamic model (Q-HDM). The analysis is conducted for a metallic spherical nanoparticle, as an example. The above hydrodynamic models are also compared with experiments available in literature. It is demonstrated that HW-HDM and QHDM outperform the other two hydrodynamic models. |
| Author(s): | M. Kupresak, X. Zheng, G. A. E. Vandenbosch, V. V. Moshchalkov |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1300 KB |
| Title: | Nonlinear/electromagnetic co-design of microwave transceivers including integrated antennas |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using Sonnet - II Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 193 KB |
| Title: | Nonlinear Supra-Electroporation in Realistic Stem Cell Morphologies |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Biomedical Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 458 KB |
| Title: | Nonlinear Supra-Electroporation in Realistic Stem Cell Morphologies |
| Abstract: | Exposing cells to ultrashort electric field pulses can lead to the permeabilization of the membranes of the internal cell organelles, such as the nucleus, which is termed as supra-electroporation. In this paper, we study the supraelectroporation of stem cells with realistic morphologies under nanosecond electrical pulse stimulation. For such short pulses, the cell and the nucleus membranes exhibit non-linearity in their conductance. Therefore, we used a non-linear model for the cells’ membranes, coupled with a quasi-static electromagnetic solver, and obtained the solution using a commercial Finite Element Method (FEM) solver. The results show that the outer shape of the cell has a strong effect on the magnitude and the spatiotemporal patterns of the electric field inside the cell, which affects the rate of the supra-electroporation of the nucleus. These variations in the rate of the supra-electroporation of the nucleus can guide the selective targeting of desired cells with specific shapes. |
| Author(s): | S. Baidya, A. M. Hassan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1428 KB |
| Title: | Nonlinear Analysis of Active Aperture Coupled Reflectarray Antenna Containing Varactor Diode |
| Abstract: | Radiation pattern of reflectarray antenna can be controlled using varactor diode in the antenna structure, but may cause nonlinear response. Thus, it is needed to design active reflectarray antenna considering nonlinear behavior of the unit cell. However, in the past papers, active element of varactor tuned reflectarray antenna is assumed linear, while in this paper, nonlinear analysis of active reflectarray antenna is explained and an active aperture coupled reflectarray unit cell containing two varactor diodes is analyzed. Harmonic balance method is used in analyzing active unit cell using nonlinear model of the diode. Therefore, this paper shows the significance of nonlinear analysis of active reflectarray antenna, and also the effect of nonlinear element in radiation pattern is presented. By the explained method, the impact of nonlinearities on performance of reflectarrays can be investigated. Furthermore, any active reflectarray cell having active device by any nonlinear model can be used in the analysis, and the impact of parameters of the model can be studied. |
| Author(s): | I. Aryanian, A. Abdipour, G. Moradi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 10 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 464 KB |
| Title: | Nonlinear Analysis and Performance Improvement of Amplifying Aperture Coupled Reflectarray Antenna |
| Abstract: | Amplifying reflectarray antenna can be used to increase the overall gain of the antenna in large distance communication systems. However, amplifying reflectarray antenna may become nonlinear in some incident powers which may lead to performance degradation. In this paper nonlinear behavior of an amplifying reflectarray antenna is studied and a new method is proposed to improve the performance of the antenna. Nonlinear analysis of the active unit cell is performed using harmonic balance method considering nonlinear model of the amplifier. Then, the effect of nonlinear element in radiation pattern of the antenna is studied. Aperture coupled patch structure is used to analyze amplifying unit cell. Finally, an amplifying reflectarray antenna considering nonlinear behavior of the active elements is designed and the proposed balanced amplifier structure is used to improve performance of the amplifying antenna. |
| Author(s): | I. Aryanian, A. Abdipour, G. Moradi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 10 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1502 KB |
| Title: | Nondestructive Clamped-Waveguide Low-loss Material Extraction Technique |
| File Type: | Conference Paper |
| Issue: | Volume: Nondestructive Evaluation and Materials Characterization Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 312 KB |
| Title: | New Compact Dual Bandpass Filter Using Coupled Double-Ring Resonators and DGS-Technique |
| Abstract: | This paper presents a design of dual-band bandpass filter using novel ring resonator and H-defected ground. The bandpass filter is designed optimized and realized using mixed coupled microstrip double ring resonators and two electrically coupled H-cells DGS resonators, which are etched in background of the structure. Using this new ring structure leads to generate a selective bandpass filter with two isolated passbands. The measurement results show that the optimized filter has two passbands, the first band from 1.6 GHz to 2 GHz and the other from 3.6 GHz to 5.5 GHz. The proposed structure occupies an area of (0.45?g × 0.35?g) with ?g = 0.044 m. The simulated and experimented results show good agreement and validate the proposed approach |
| Author(s): | A. Boutejdar, N. M. Eltabit, A. A. Ibrahim, E. P. Burte, M. A. Abdalla |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 2 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 470 KB |
| Title: | Near-Field Wireless Transfer to Embedded Smart Sensor Antennas in Concrete |
| Abstract: | Wireless power transfer to embedded smart sensor antennas using near-field coupled loop antennas is experimentally studied. Multi-turn loop antennas designed for operation at around 10 MHz show that they can attain fairly high efficiency when properly matched and operated in close proximity to each other whether in free-space or within dry concrete. When one loop is embedded inside 2, 4, and 6 cm of concrete while the other resides over it, it is shown that the embedded loop can receive about 1.9, 1.6, and 1.3 watts of power respectively when the transmit power is 5 watts. Thus, even with an external transmitter with only 1 watt of power (30 dBm) will allow the received power to be 380 mw, 360 mw, and 260 mw for 2, 4, and 6 cm of concrete respectively. It is expected that the use of an even larger loop, magnetic material loading, and or the use of a flux concentrator will increase the efficiency further. |
| Author(s): | X. Jin, J. M. Caicedo, M. Ali |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 3 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1429 KB |
| Title: | Near-Field Analysis and Design of Inductively-Coupled Wireless Power Transfer System in FEKO |
| Abstract: | Inductively-coupled wireless power transfer (WPT) system is broadly adopted for charging batteries of mobile devices and electric vehicles. The performance of the WPT system is sensitively dependent on the strength of electromagnetic coupling between the coils, compensating topologies, loads and airgap variation. This paper aims to present a comprehensive characteristic analysis for the design of the WPT system with a numerical simulation tool. The electromagnetic field solver FEKO is mainly used for studying high-frequency devices. However, the computational tool is also applicable for not only the analysis of the electromagnetic characteristic but also the identification of the electrical parameters in the WPT system operating in the nearfield. In this paper, the self and mutual inductance of the wireless transfer windings over the various airgaps were inferred from the simulated S-parameter. Then, the formation of the magnetic coupling and the distribution of the magnetic fields between the coils in the seriesparallel model were examined through the near-field analysis for recognizing the efficient performance of the WPT system. Lastly, it was clarified that the FEKO simulation results showed good agreement with the practical measurements. When the input voltage of 10 V was supplied into the transmitting unit of the prototype, the power of 5.31 W is delivered with the transferring efficiency of 97.79% in FEKO. The actual measurements indicated 95.68% transferring efficiency. The electrical parameters; Vin, Vout, Zin, theta, Iin, and Iout, had a fair agreement with the FEKO results, and they are under 8.4% of error. |
| Author(s): | D. Kim, A. T. Sutinjo, A. Abu-Siada |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 1 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2669 KB |
| Title: | Narrow-band Bandpass Filters with Improved Upper Stopband Using Open/Shorted Coupled Lines |
| Abstract: | Two transversal narrow-band bandpass filters with improved stopband based on open/shorted coupled lines and transversal signal-interaction concepts are proposed in this paper. By utilizing the stopband transmission characteristic of the open/shorted coupled lines, three transmission zeros can be easily achieved to suppress the second harmonic for the first bandpass filter. To further reduce the circuit size of the first filter, unequal open stubs and transmission lines are used for the second bandpass filter with six transmission zeros in the upper stopband. The transmission zeros near the passband can be adjusted conveniently by only changing the electrical length of the open/shorted stubs when the ratio of characteristic impedance is fixed. To verify the presented concepts, two prototypes (?r =2.65, h = 0.508 mm, tan? = 0.003) with 3-dB fractional bandwidths (FBWs) of 4.3% (1.78-1.86 GHz), 2.8% (1.76-1.81 GHz) are designed and fabricated. Good agreements are observed for the theoretical and measured results, indicating good in-band filtering performances and high selectivity. |
| Author(s): | W. Feng, M. Hong, W. Che |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 2 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1174 KB |
| Title: | Mutual Coupling Reduction in MIMO Patch Antenna Array Using Complementary Split Ring Resonators Defected Ground Structure |
| Abstract: | In this paper, complementary split ring resonators (CSRRs) defected ground structure (DGS) is introduced to suppress surface waves and to reduce the mutual coupling between E-plane coupled two elements of a microstrip patch MIMO antenna array. The CSRRs- DGS is easily etched on the ground plane between the array elements. The CSRRs-based DGS acts as a bandstop filter between the array elements and operates in the same desired frequency band of the array at 9.2 GHz. Significant reduction of the electromagnetic (EM) mutual coupling is achieved between array elements with a reduced edge-to-edge spacing of 7.5 mm (0.22 ?o). Experimental results show that more than 30 dB isolation between the array elements is obtained using an array of CSRR-based DGS. Moreover, the antenna array parameters are successfully optimized with a numerical experimentation technique using a 3D full-wave EM simulator. The design of the proposed array is fabricated and measured for verification purposes. The proposed design has been simulated and validated experimentally. Good agreement is found between the simulated and the measured data. |
| Author(s): | H. A. Attalah, A. B. Abdel-Rahman, K. Yoshitomi, R. K. Pokharel |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1027 KB |
| Title: | Multiphysics Characterization of Large-Scale Through-Silicon-Via Structures |
| File Type: | Conference Paper |
| Issue: | Volume: S13 Advanced Electromagnetic Modeling Methods I Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 191 KB |
| Title: | Multioctave Antenna Array for Simultaneous Transmit and Receive Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Broadband Antennas and Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 535 KB |
| Title: | Multilayer Compact Dual-band Branch-line Coupler using Coupled Line and Open-ended Stub for Mobile Phone Application |
| File Type: | Conference Paper |
| Issue: | Volume: 3-MA-2 Novel Multi-functional Integrated Microwave Circuits and Components Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 607 KB |
| Title: | Multi-trace Boundary Integral Formulations with Eddy Current Models |
| File Type: | Conference Paper |
| Issue: | Volume: S59 Frequency and Time Domain Integral Equation Solvers II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 438 KB |
| Title: | MOM Solution of the Tube and the Single Material Optical Fibers of Arbitrary Cross Section |
| File Type: | Conference Paper |
| Issue: | Volume: Fast and Efficient Methods for Transmission Lines and Waveguides Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 130 KB |
| Title: | MoM Analysis of Apertures in Chiral Bodies of Revolution |
| Abstract: | A chiral body of revolution (BOR) which is partially covered by a thin conducting shield is analyzed using the Method of Moments (MOM). The axisymmetric system is excited by a plane wave. The internal fields and the far scattered fields are computed. The problem is solved using the surface equivalence principle. The scattered fields outside the structure are assumed to be produced by an equivalent magnetic surface current that exists on the unshielded part of BOR surface and an external equivalent electric surface current that exists over the entire BOR surface. These two currents are assumed to radiate in the unbounded external medium. Similarly, the internal fields are assumed to be produced by the negative of the above magnetic current and an internal electric surface current that exists over the entire BOR surface, but is an independent unknown only on the shielded part of the BOR surface. These two currents radiate in the unbounded internal medium. Enforcing the boundary conditions at the surface of the BOR results in a set of coupled integral equations for the three equivalent surface currents. These equations are solved numerically using the MOM. The computed results for the partially shielded spherical chiral body are in excellent agreement with other data. |
| Author(s): | K. Qutubuddin, H. Mustacoglu, J. R. Mautz, E. Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 8 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1861 KB |
| Title: | Modelling of Interbranch Coupled 1:2 Tree Microstrip Interconnect |
| Abstract: | A computational method of unbalanced single-input two-output (1:2) interconnect with coupled interbranch is introduced. The circuit theory is built with the topology constituted by the octopole Z-matrix represented by the coupled lines. The voltage transfer functions (VTFs) and the input impedance of the input-output electrical path of the unbalanced 1:2 tree with interbranch coupled lines are established. The computation model is verified with proofs of concept (POC) constituted by unbalanced 1:2 tree microstrip structure with and without interbranch coupled phenomenon. The POCs are loaded by resistors and capacitors. Good agreements between the simulated and modelled VTFs and the overall structure input impedances were obtained from 0.1-to-2 GHz. |
| Author(s): | B. Ravelo, A. Normand, F. Vurpillot |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2004 KB |
| Title: | Modeling-Based Synthesis of a Microwave Heating Process Producing Homogeneous Temperature Field |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling with QuickWave/Concerto Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 237 KB |
| Title: | Modeling Time Domain Multiphysics of Reverse Saturable Absorption |
| File Type: | Conference Paper |
| Issue: | Volume: S25 Time Domain Methods II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 251 KB |
| Title: | Modeling of Electromagnetic Interference Between GPS Reception and VHF/UHF Transmission on a Military Aircraft |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Session- Students Paper Competition Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 512 KB |
| Title: | Mixed Finite Element Methods for the Maxwell’s Equations with Matrix Parameters |
| File Type: | Conference Paper |
| Issue: | Volume: S25 Time Domain Methods II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 166 KB |
| Title: | Miniaturized Wilkinson Power Divider with nth Harmonic Suppression using Front Coupled Tapered CMRC |
| Abstract: | In this paper, a novel microstrip power divider with a new technique for nth harmonic suppression is presented. This technique is based on using front coupled tapered compact microstrip resonant cell (FCTCMRC) that inserted into a quarter-wavelength transmission line of the conventional Wilkinson power divider. This cell is used to obtain high harmonic suppression. The proposed power divider not only impressively improves harmonic suppression, but also reduces the length of a quarter-wave line over 29.3 % as compared with the conventional power divider. From the measured results, the proposed structure achieved ultra wide stop-band bandwidth (6 GHz – 12 GHz) with a minimum attenuation level of 24 dB, while maintaining the characteristics of the conventional Wilkinson power divider. The input and output return losses at 2 GHz are 48 and 44 dB, respectively. The insertion loss is about 3.1 dB and better than 45 dB isolation is obtained. |
| Author(s): | M. Hayati, S. Roshani, S. Roshani |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 3 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 406 KB |
| Title: | Miniaturized Wideband Circularly Polarized Triangular Patch Antennas based on Characteristic Mode Analysis |
| Abstract: | A miniaturized, wideband circularly polarized (CP) antenna based on coupled triangular patches is presented. Initially, two identical triangular patches with shorting pins are placed close to each other in a perpendicular orientation. Hence, a pair of orthogonal modes can be produced based on the coupled resonators. Under the characteristic mode analysis (CMA), it can be found that the 90◦ phase difference is achieved by modulating gap distance and shorting pins numbers. Both the shape of triangle patches and shorting pins contribute to the miniaturization. To further improve the AR bandwidth, a third patch is added to form a new mode. Thanks to the triple modes produced by the three patch elements, two AR minima are constructed to broaden the AR bandwidth. With this compact arrangement and shorting pins, a miniaturized wideband CP patch antenna with a 5.2% AR bandwidth is successfully implemented. The overall size of the antenna is merely 0.34λ0×0.33λ0×0.046λ0. |
| Author(s): | T.-L. Yang, X. Zhang, Q.-S. Wu, T. Yuan |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 10 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 6449 KB |
| Title: | Miniaturized Wideband Bandpass Filter based on Capacitor-loaded One-eighth Wavelength Coupled Line |
| Abstract: | A novel miniaturized wideband bandpass filter (BPF) using capacitor-loaded microstrip coupled line is proposed. The capacitors are loaded in parallel and series to the coupled line, which makes the filter just require one one-eighth wavelength coupled line and achieve filtering response with multiple transmission poles (TPs) and transmission zeros (TZs). Compared with the state-of-the-art microstrip wideband BPFs, the proposed filter has the advantages of compact size and simple structure. A prototype centered at 1.47 GHz with the 3-dB fractional bandwidth of 86.5% is demonstrated, which exhibits the compact size of 0.003λ2/g (λg is the guided wavelength at the center frequency) and the minimum insertion loss of 0.37 dB. |
| Author(s): | J. Shi, J. Dong, K. Xu, L. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 7 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1351 KB |
| Title: | Miniaturized Strongly Coupled Magnetic Resonance Design Based on Dielectric Split-ring Resonator for Wireless Power Transmission |
| File Type: | Conference Paper |
| Issue: | Volume: Wireless Powering of Devices and Energy Harvesting Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 249 KB |
| Title: | Miniaturized LTCC Bandpass Filter with Harmonic Supression |
| Abstract: | This paper presents a harmonicsuppressed bandpass filter using a 3-dimensional (3-D) half-wavelength transmission line resonator, which is fabricated using low temperature co-fired ceramic (LTCC) technology. Owing to the distributed-element method in this 3-D design, the spurlines can be easily etched on the coupled feed lines to generate an extra transmission zero in the stopband without enlarging the circuit size. As a result, the second harmonic can be rejected to a great extent. For demonstration, a pair of two-order LTCC bandpass filters centered at 2.45 GHz with/without spurlines are designed using the compact 3-D resonator, and the size of the circuits is only 4.4×4.2×1.6 mm3 . |
| Author(s): | C. Shao, H. Tang, R. Mao, J.-X. Chen, J. Shi, Z.-H. Bao |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 3 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 741 KB |
| Title: | Miniaturized Dual-Mode Dual-Band BPF Using a Single Square Patch Loaded Stepped-Impedance Square Open Loop Resonator |
| Abstract: | This letter presents a dual-mode dualband Bandpass Filter (BPF) using a single Square Patch Loaded Stepped-Impedance Square Open Loop Resonator (SPLSISOLR). The first four Transmission Poles (TPs) of SPLSISOLR can be tuned freely. A pair of high-impedance microstrip lines coupled with the resonator are employed to excite these four TPs to build up a dual-mode dual-band BPF, with two TPs in each passbands. The tapped point of the 50 ? feeding lines can be freely sliding on the high impedance microstrip lines, which increases the design freedom of external quality factor of two passbands. To validate the proposed method, a dual-band filter centered at 1.79/5.42 GHz with -3 dB fractional bandwidth of 4.5%/22.5% and compact size of 0.15?g × 0.14?g are designed. The fabricated filter has the merits of high band-to-band isolation, wide stopband, DC block and simple design procedure. |
| Author(s): | J. Xu |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 10 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 810 KB |
| Title: | Miniature Antennas and Arrays Embedded within Magnetic Photonic Crystals and Other Novel Materials |
| Abstract: | Engineered materials, such as new composites, electromagnetic bandgap and periodic structures have been of strong interest in recent years due to their extraordinary and unique electromagnetic behaviors. This paper will address how modified materials, inductive/capacitive lumped loads and low loss magnetic materials/crystals are impacting antenna design with the goal of overcoming miniaturization challenges (viz. bandwidth and gain reduction, multi-functionality etc.). Dielectric design and texturing for impedance matching has, for example, led to significant size reduction and higher bandwidth low frequency antennas. Examples showing a factor of 2 or more reduction in ultrawideband antennas will be shown and operating down to nearly 100MHz using a 6” aperture. A recently introduced new class of magnetic photonic crystals (MPCs) and Degenerate Band Edge (DBE), displaying spectral nonreciprocity are also introduced. Studies of these crystals have demonstrated that MPCs exhibit the interesting phenomena of (a) drastic incoming wave slow down, coupled with (b) significant amplitude growth while (c) maintaining minimal reflection at the interface with free space. The phenomena are associated with diverging frozen modes that occur around the stationary inflection points within the band diagram. Taking advantage of the frozen mode phenomena, we demonstrate that individual antenna elements and linear or volumetric arrays embedded within the MPC and DBE structures allow for supergain effects that can lead to novel miniature (high sensitivity and high gain antennas and sensors) array configurations. |
| Author(s): | John L. Volakis, Kubilay Sertel, Chi-Chih Chen, John L. Volakis, Kubilay Sertel, Chi-Chih Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 1 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 2104 KB |
| Title: | MH-53J/M Pave Low Helicopter, Shunt-Type HF Towel Bar Antenna Rotor Modulation Effects |
| File Type: | Conference Paper |
| Issue: | Volume: Practical Applications of Method of Moments Modeling Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 458 KB |
| Title: | Method for Determining Statistical Mean and Variance of Electromagnetic Energy in Coupled Rooms |
| File Type: | Conference Paper |
| Issue: | Volume: S13 Advanced Electromagnetic Modeling Methods I Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 339 KB |
| Title: | Metasurface-coupled Microbolometers in CMOS Technology |
| File Type: | Conference Paper |
| Issue: | Volume: 1-SP-4 Metasurfaces/Metamaterials Theory, Design and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 616 KB |
| Title: | Metamaterial Based Compact Branch-Line Coupler with Enhanced Bandwidth for Use in 5G Applications |
| Abstract: | A novel compact 5G branch-line coupler (BLC) based on open-circuit coupled-lines and interdigital capacitor structure is presented in this paper. The proposed BLC shows the composite right/left handed (CRLH) metamaterial transmission-line (TL) operation. The proposed BLC is designed and simulated using CST microwave studio. The designed BLC is then fabricated using the FR4 substrate (εr = 4.3 and h = 1.66mm). The proposed 5G BLC with coupled-lines and the interdigital capacitor has achieved the fractional bandwidth of ~ 40.2% and the size reduction of 54% as compared to the conventional BLC. The fabricated BLC operates at 2.74 – 4.15GHz frequency band with a coupling factor of -3 ± 0.2dB and the phase difference of 88o between the output ports. The BLC measurements are performed at the operating frequency of 3.5GHz. The simulated and measured scattering parameters and phase difference results are in good agreement with each other. The proposed design is suitable for use in future butler-matrix based beamforming networks for antenna array systems in 5G wireless applications. |
| Author(s): | A. K. Vallappil, M. K. A. Rahim, B. A. Khawaja, M. Aminu-Baba |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 6 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1906 KB |
| Title: | Material Models in Full-Wave Nonlinear Optics |
| File Type: | Conference Paper |
| Issue: | Volume: S13 Advanced Time Domain Solvers for Multiphysics Modeling in Photonics Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 979 KB |
| Title: | LTCC Wideband Bandpass Filter Based on Multi-layered Coupling |
| Abstract: | A novel wideband bandpass filter (BPF) based on multi-layered coupling using low temperature co-fired ceramic (LTCC) technology is proposed. Four folded quarter-wavelength layered coupled lines are distributed in 3D space to achieve compact circuit structure. Two transmission zeros near edges of the passband response can be easily realized by the two quarter-wavelength open/short coupled lines. Besides over 15-dB out-of-band rejection, the insertion loss of less than 0.7 dB is realized in the passband. A prototype with 3-dB fractional bandwidth of 25.7% operated at 2.95 GHz is designed and fabricated. |
| Author(s): | X. Gao, W. Feng, W. Che |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 2 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1987 KB |
| Title: | Low-Frequency Modeling of 3-D Coupled Obstacles and Inversion by Differential Evolution |
| File Type: | Conference Paper |
| Issue: | Volume: Efficient Numerical Solutions of Large Multi-dimensional Inverse Scattering Problems Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 199 KB |
| Title: | Linear Dielectric Resonator Array Fed by N-Way Bow-Tie Shaped Dielectric Resonator Power Divider |
| Abstract: | The concept of using high order modes of a bow-tie shaped dielectric resonator in the design of N-way power divider is presented in this paper. The design of 6-way power divider operating at X-band frequency range is illustrated, simulated and tested for concept validation. The combination of probe type excitation and microstrip technology is used to excite an Hpolarized resonating mode around 10 GHz. Both input matching and in phase tapered power distribution are experimentally maintained within 150 MHz frequency band around the resonant frequency. Measured scattering parameters magnitude and phase of the proposed 7-port structure are shown to verify the expected simulation results. Also, the proposed power divider is used to excite an antenna array of six rectangular dielectric resonators using narrow slots coupled to the power divider output through microstrip lines. Good agreement between simulated and measured results is obtained for application validation. |
| Author(s): | L. Hady Salman, A. Kishk, D. Kajfez |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 10 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1725 KB |
| Title: | Ka Band Aperture-coupled Patch Antenna with Stacked Parasitic Strips based on LTCC Technology for Circular Polarization |
| File Type: | Conference Paper |
| Issue: | Volume: 2-P2-B Space and Satellite Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 378 KB |
| Title: | Investigation and Analysis of Electromagnetic Interference for PWM Encoder of Urban Rail Train |
| Abstract: | Electromagnetic compatibility (EMC) is an important factor in ensuring the safe operation of the sensitive electronic equipment on urban rail trains. The pulse width modulation (PWM) encoder of an urban rail train exported from China to Brazil is sometimes affected by electromagnetic interference (EMI), which causes the train to fail to run properly. To solve this problem, the EMC test is performed on the PWM encoder to identify the coupling path and the type of interference source. The EMI coupling model and the vehicle-catenary-rail model are established by using an electromagnetic transients program (EMTP) to analyze the mechanism of interference coupling. It is shown that the unbalanced voltage of the train body caused by the backflow of the grounding current is the root cause of the interference of the PWM encoder. The maximum voltage coupled to the internal port of the PWM encoder is about 1894 V, which is sufficient to burn out the encoder. A measure to suppress the interference by installing thyristor surge suppressors (TSS) P0300SC is proposed, which effectively solves the EMI problem of the PWM encoder. |
| Author(s): | Y. Yang, F. Zhu, Y. Wang, C. Yang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 3185 KB |
| Title: | Integration of an Equivalent Aperture Method into Full-wave Electromagnetic Simulation of Airborne Radomes |
| Abstract: | A method is provided for performing efficient, accurate, full-wave electromagnetic simulations of airborne radomes by representing the enclosed antenna with an equivalent aperture field distribution. In this case, the antenna and radome problems are essentially decoupled, and fine meshing details in the antenna region of the problem are eliminated. The equivalent aperture governing equations are discussed, and an algorithm for forming a representative aperture field distribution from far-field radiation patterns is provided. The success of the equivalent aperture method is demonstrated via an example problem. Equivalent aperture results are compared to full-wave simulations of a corresponding fully-detailed slot array antenna. For both the equivalent aperture and corresponding slot array antennas, a 2:1 fineness ratio tangent ogive radome with dielectric constant of 7 and metallic tip is simulated to determine the effects on radiation patterns, loss, and boresight error. Radome insertion loss agreement is achieved to within 0.3 dB or better and boresight error agreement is achieved to within 0.05 deg or better in both elevation and azimuth scan planes for a significantly detuned radome wall. Both transmit-mode and receive-mode formulations of the full-wave radome analysis and their appropriate uses are described. |
| Author(s): | B. L. Cannon, J. W. Jordan |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 5 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 647 KB |
| Title: | Integral equation formulation for the impedance representation of aperture-coupled devices with finite wall conductivity |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Recent Electromagnetics & Antennas Activities in the European Network "ACE" Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 326 KB |
| Title: | Installed Antenna Performance in Airborne Radomes of Different Profiles |
| Abstract: | In this paper, broadband interactions between an antenna and a radome are modelled using a full wave numerical solver. By accurately describing both the antenna and the radome geometry with a single numerical method, a comprehensive prediction of the performance of the coupled antenna and radome installation is provided. The paper compares how different airborne dielectric radome profiles affect the antenna performance, predicting effects not seen in uncoupled simulations. |
| Author(s): | A. Vukovic, P. Sewell, X. Meng, T. M. Benson |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 8 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1840 KB |
| Title: | Installed Antenna Performance in Airborne Radomes of Different Profiles |
| Abstract: | In this paper, broadband interactions between an antenna and a radome are modelled using a full wave numerical solver. By accurately describing both the antenna and the radome geometry with a single numerical method, a comprehensive prediction of the performance of the coupled antenna and radome installation is provided. The paper compares how different airborne dielectric radome profiles affect the antenna performance, predicting effects not seen in uncoupled simulations. |
| Author(s): | A. Vukovic, P. Sewell, X. Meng, T. M. Benson |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1837 KB |
| Title: | Installed Antenna Performance in Airborne Radomes of Different Profiles |
| Abstract: | In this paper, broadband interactions between an antenna and a radome are modelled using a full wave numerical solver. By accurately describing both the antenna and the radome geometry with a single numerical method, a comprehensive prediction of the performance of the coupled antenna and radome installation is provided. The paper compares how different airborne dielectric radome profiles affect the antenna performance, predicting effects not seen in uncoupled simulations. |
| Author(s): | A. Vukovic, P. Sewell, X. Meng, T. M. Benson |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1837 KB |
| Title: | Inclusion of Flaking Effects Inside a Pressed Layer Structure in the Electromechanical Analysis with the Aid of Static Condensation and Floating Potentials |
| File Type: | Conference Paper |
| Issue: | Volume: Posters Session 2 Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 405 KB |
| Title: | Improvements in DNA Biosensors Using Joint Split Ring Resonators Coupled with Thin Film Microstrip Line |
| Abstract: | Detecting the presence of materials in biomedical science using THz sensors, especially thin DNA strands, needs considerably sensitive sensors. Connection of unit cells in new frequency selective surface (FSS) structure, coupled with transmission line is introduced so that not only helps to miniaturize in sensing applications through THz frequency range, but also has steeper flanks in transitions, thus leads us to have higher sensitivities. All of the results are taken out from resonant frequencies related to reflection (s11), a new property used instead of transmission loss (s21), which is measurable using THz spectrometers. The effect of analyte thickness and dielectric properties of load on frequency response is explained. This approach is a new way in recognizing very small amounts of material even with rather low dielectric constants. |
| Author(s): | M. Abdolrazzaghi, A. Abdolali, S. Hashemy |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 2 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 518 KB |
| Title: | Improvement of Microwave Heating Uniformity via Shelled Processing |
| File Type: | Conference Paper |
| Issue: | Volume: 3-4-A Multi-Physics Modelling and Time-Domain and Frequency-Domain Computational Methods Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 290 KB |
| Title: | Improvement of Compactness of Lowpass/Bandpass Filter Using a New Electromagnetic Coupled Crescent Defected Ground Structure Resonators |
| Abstract: | This paper introduces a new compact defected ground structure (DGS) low pass filter (LPF) using a crescent shape structure etched in the ground plane. The filter response has improved dramatically by employing coupling of two DGS structures. Furthermore, the transformation to bandpass filter (BPF) is also investigated. The proposed configuration improved the lowpass response by widening the rejection band while significantly reducing the size. The behaviour of the filter has been investigated using HFSS as well as lumped element equivalent circuit model simulations using parallel L-C resonator. The proposed filter has been optimized. |
| Author(s): | M. Al Sharkawy, A. Boutejdar, F. Alhefnawi, O. Luxor |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 7 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 968 KB |
| Title: | Hybrid optimization techniques including deterministic electromagnetic/mechanical simulators and statistical tools |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Computer-Aided Design of Electromagnetic Structures and Devices Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | Hybrid optimization techniques including deterministic electromagnetic/mechanical simulators and statistical tools |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Computer-Aided Design of Electromagnetic Structures and Devices Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 203 KB |
| Title: | High Selectivity Bandpass Filter Using Three Pairs of Coupled Lines Loaded with Shorted Stubs |
| Abstract: | A high selectivity bandpass filter with multiple transmission poles (TPs) and transmission zeros (TZs) has been presented. By employing three pairs of parallel-coupled lines and two shorted stubs, sharp rolloff skirts and high stopband rejections can be achieved with five TPs and ten TZs. Theoretical analysis is explained and simulated results are illustrated on this high-performance filter. Finally, a bandpass filter example with center frequency of 2.15 GHz and 3-dB fractional bandwidth of 19% is designed, fabricated, and measured. It is shown that the measured transition band roll-off rates are better than 425 dB/GHz. Good agreement between the simulations and measurements validates the design method. |
| Author(s): | K.-D. Xu, F. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1667 KB |
| Title: | High Gain, Wideband Aperture Coupled Microstrip Antenna Design Based on Gain-Bandwidth Product Analysis |
| Abstract: | Aperture coupled antennas are studied in terms of Gain-Bandwidth Product (GBWP). To understand whether resonant or non-resonant slot coupled antenna has better performance, several antenna designs with different slot shapes are optimized and compared to each other. Even for a pin-feed microstrip antenna, we show that there exists a substrate height and aspect ratio for optimal GBWP. Based on this analysis, a stacked aperture coupled antenna is designed and optimized for high gain and wideband for Ku band downlink (10.8- 12.75 GHz) applications. The designed antenna exhibits 9.5 dBi broadside gain with 80° half power beam width and almost 30% bandwidth. Ku-band gain ripple is less than 0.5 dB. The antenna is built and measured. Several figure-of-merits based on GBWP have been defined to compare its performance with earlier works. Proposed antenna can be used in demanding high gain, wideband, beam scanning array applications. |
| Author(s): | M. M. Bilgic, K. Yegin |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 8 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 1055 KB |
| Title: | High Gain Circularly Polarized X-shaped Aperture Coupled Antenna for WLAN Applications |
| Abstract: | This paper presents a new high gain compact aperture-coupled circularly polarized antenna for WLAN applications. The proposed antenna comprises an asymmetric X-shaped slot etched on a circular patch and fed through the coupling between an annular slot and a microstrip line. The circular polarization is mainly due to the asymmetrical crossed-slots, respecting the angle of 450 between its two arms. The antenna with overall size of 60 × 60 × 5.83 mm3 has a measured 10-dB impedance bandwidth of 36%, a 3-dB axial ratio bandwidth of 3.47% (5.67–5.87 GHz) and 1-dB gain bandwidth of 19.5% (4.85-5.90 GHz) with a peak gain of 8.65 dBi. To validate the simulated results, a prototype was fabricated, and good agreement between simulations and measurements has been accomplished. |
| Author(s): | M. A. Meriche, A. Messai, T. A. Denidni, H. Attia |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 10 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1455 KB |
| Title: | Harmonic Suppression of Parallel Coupled-Line Bandpass Filters using Defected Microstrip Structure |
| Abstract: | This paper presents a novel miniaturized parallel coupled-line bandpass filter by etching some slot resonators on the strip for suppressing the first spurious response. These slots perform a serious LC resonance property in certain frequency and suppress the spurious signals. By properly tuning these slot dimensions, multiple closed notches can be generated in the vicinity of spurious harmonic and a wide stopband can be obtained. Slot on the strip that is called Defected Microstrip Structure (DMS). The DMS interconnection disturbs the current distribution only across the strip, thereby giving a modified microstrip line with certain stop band and slow-wave characteristics. The simulation and measurement of a 4.7 GHz prototype bandpass filter are presented. The measured results show a satisfactory rejection level more than 30 dB at first spurious passband without affecting the passband response. Good agreement between the experimental and full-wave simulated results has been achieved. |
| Author(s): | M. Naser-Moghadasi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 5 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 540 KB |
| Title: | GPU-Accelerated Thin Wire Computations Coupled to DGFEM Electromagnetic Field Formulations |
| File Type: | Conference Paper |
| Issue: | Volume: Parallel and Hardware Acceleration for Computational Electromagnetics Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 736 KB |
| Title: | Genetic Algorithm Based Shape Optimization Method of DC Solenoid Electromagnetic Actuator |
| Abstract: | This paper presents the method for the shape optimization of the DC solenoid electromagnetic actuator using a genetic algorithm. Numerical simulation of its transient response includes simultaneously solving differential equations of magnetic, electrical and mechanical subsystems. The magnetic subsystem is analyzed by finite element method (FEM), while the electrical and mechanical subsystems are modeled separately and mutually coupled. A modified genetic algorithm is programmed in MATLAB software package. The shape optimization has been performed on two-dimensional (2D) axial-symmetric model of electromagnetic actuator. The measurement results obtained after the production and testing of electromagnetic actuator are compared with results of numerical simulation. |
| Author(s): | E. Plavec, I. Uglesic, M. Vidovic |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 3 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2573 KB |
| Title: | FVTD Thin-Wire Modelling of a Microwave Tomography System |
| File Type: | Conference Paper |
| Issue: | Volume: Finite-Volume and Discontinuous Galerkin Time-Domain Techniques Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 750 KB |
| Title: | FVTD Simulation of a Probe-fed Hemispherical Dielectric Resonator Antenna with Finely Resolved Structural Details |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Advances in Time Domain Modeling Techniques Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 921 KB |
| Title: | Full-wave spectral domain analysis of microstrip circuits and antennas fabricated on magnetized ferrites |
| File Type: | Conference Paper |
| Issue: | Volume: Bianisotropic and Metamaterial Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 166 KB |
| Title: | Full Parametric Study and Direct Electromagnetic Design of Microstrip and Stripline Bandpass Filters |
| File Type: | Conference Paper |
| Issue: | Volume: EM – Simulation – Driven Design: Modeling and Optimization Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 161 KB |
| Title: | Frequency Selective Surface Network for In-Phase Ground Plane Reflections in Tightly Coupled Dipole Arrays |
| File Type: | Conference Paper |
| Issue: | Volume: S16 Metamaterial, Devices, and Antenna Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 2851 KB |
| Title: | Frequency Reconfigurable Monopole Antenna for Multimode Wireless Communications |
| Abstract: | This paper describes a compact reconfigurable microstrip antenna for multimode wireless communications, whose frequency characteristic can be reconfigured electronically to operate at 2.4 GHz (Bluetooth), 3.5 GHz (WiMAX) or 5.2/5.8 GHz (WLAN). The presented microstrip monopole antenna consists of an open-stub microstrip line with two inverted coupled U-shaped parasitic structures and ground plane. Reconfigurability is obtained by implementing two PIN diodes across the antenna structure and biasing these active elements. The proposed antenna can obtain good return loss property with -38 dB at 2.4 GHz, -42 dB at 3.5 GHz and -47 dB at 5.5 GHz. The proposed microstrip antenna fabricated on an FR4 substrate with thickness of 1.6 mm, relative permittivity of 4.4 and has a small size of 12×18 mm2 . The measured return loss characteristics are in good agreement with simulated results, which verified the reliability of the designed antenna. So this new design should have many applications in the circuit where reconfigurable antenna is used. |
| Author(s): | N. Ojaroudi, N. Ghadimi, Y. Ojaroudi, S. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 8 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 772 KB |
| Title: | Folded Marchand Balun Design and Validation Using Sonnet |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications in Sonnet Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 297 KB |
| Title: | Finite Size Effects on the Performance of Ultrawideband Tightly Coupled Arrays |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using FEKO II Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 868 KB |
| Title: | Finite Ground CB-CPW Bandpass Filter using Vertically Installed Coupled Open-ended Stubs |
| Abstract: | In this paper, a conductor backed coplanar waveguide (CB-CPW) 3rd order bandpass filter is designed using coupled open-ended stub resonator placed vertically to the signal line. Vertically loaded open ended stubs are designed at quarter wavelength so as to behave like a short circuit at the input terminal thus giving a band-accepted response with lesser metallic area or minimum size. Four such coupled open ended resonators are placed in series and also in closely manner to provide greater field confinement of the proposed bandpass filter. The bandpass filter is designed for a center frequency of 2.5 GHz with FBW of 97.89%, insertion loss of <0.5dB, rising and falling edge selectivity of 30.75 dB/GHz and 27.01dB/GHz respectively with a wide stopband of around 4GHz after the desired passband. Further to validate the design technique six such resonators are placed to obtain 5th order bandpass filter. |
| Author(s): | P. Mondal, S. K. Parui, R. Bera |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1432 KB |
| Title: | Finite Element Modeling of Thermoelectrically Coupled Nanoantennas for Mid- to Far-Infrared Detection |
| File Type: | Conference Paper |
| Issue: | Volume: S31 Electromagnetic/Thermal Modeling of Infrared/Optical Antennas Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 439 KB |
| Title: | Finite Element High Frequency Circuit Coupled Model of Electric Machines for Simulating Electromagnetic Interference in Motor Drives |
| File Type: | Conference Paper |
| Issue: | Volume: Advancements in Finite-Element Analyses Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 210 KB |
| Title: | FE Analysis on Temperature, Electromagnetic Force and Load Capacities of Imperfect Assembled GIB Plug-in Connectors |
| Abstract: | For purpose of providing effective method of optimal design and failure prediction of plug-in power connector with imperfect assembly conditions, this paper evaluate distributions of operation current, temperature rise and electromagnetic forces of gas insulated bus (GIB) plug-in connector by mechanical-electromagneticthermal multi-physics coupled finite element (FE) method. The FE procedure took current constriction effects among contact spots into account by imperfect contact bridge model. Effectiveness of numerical model was verified by physical experiments. Mechanical, electromagnetic and thermal behaviors of plug-in connector under various assembly conditions (preloading force, conductor insert depth and docking angle) were analyzed. Results show that due to the deviations of contact forces, operation currents and temperature rises among contact spots are not uniform. Influenced by overheating and electromagnetic force on several terrible contact spots with larger currents flow through, load capacity of plug-in connector could be reduced to 82%, 46% and 15% of design values with insufficient preloading contact force, insufficient conductor insert depth and docking angles deviation. |
| Author(s): | X. Guan, X. Wei, X. Song, N. Shu, H. Peng |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 6 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2565 KB |
| Title: | FDTD Method Coupled with the Over Set Grid Generation Method while Considering the Lorentz Transformation in 3D Structures |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced FVTD/DG/FDTD Techniques Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 180 KB |
| Title: | Fast Orthogonal Propagator Direction-Finding Algorithm Based on Fourth-Order Cumulants |
| Abstract: | In this paper, a low complexity approach called modified fourth-order cumulants orthonormal propagator method (MFOC-OPM) is proposed for direction-of-arrival (DOA) estimation of incident narrowband signals impinging on a uniform linear array (ULA). In the proposed algorithm, the modified fourthorder cumulants (MFOC) matrix is achieved via removing the redundant information encompassed in the primary fourth-order cumulants (FOC) matrix, and then the direction-of-arrivals (DOAs) estimation of source signals can be resolved by exploiting the orthonormal propagator method (OPM). Without any spectrum-peak searching and eigenvalue decomposition (EVD) of the MFOC matrix, the theoretical analysis coupled with simulation results show that in comparison with the MFOC-MUSIC algorithm, the resultant algorithm can reduce computational complexity significantly, as well as yield good estimation performance in both spatiallywhite noise and spatially-color noise environments. |
| Author(s): | H. Shi, W. Leng, A. Wang, H. Chen, Y. Ji |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 6 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 738 KB |
| Title: | Fast iterative electromagnetic integral equation solvers on GPUs |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 726 KB |
| Title: | Fast iterative electromagnetic integral equation solvers on GPUs |
| File Type: | Conference Paper |
| Issue: | Volume: GPU for CEM Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 726 KB |
| Title: | Extrema of Two-Port Network Transducer Power Gain and Voltage Gain Under Varying Port Terminations: Semi-Analytical Method and Application to Biotelemetry System |
| Abstract: | Analysis of the structure of the level sets of transducer power gain and voltage gain of a two-port network enables a semi-analytical method for finding the extrema these performance indicators as the port terminations vary in bounded rectangles in the complex plane. In particular, we show that the extrema are necessarily attained in small-dimensional subsets of the given rectangles. This provides efficient means to assess the impact of variability in the port terminations numerically. As an example, we study how variability in the port terminations affects the performance of a biotelemetry system composed of magnetically coupled small loops with highly sensitive impedance matching properties. |
| Author(s): | T. Bjorninen |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 6 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2059 KB |
| Title: | Extension of Open EM Modeling Platform Toward Electrochemistry and Energy Materials |
| File Type: | Conference Paper |
| Issue: | Volume: S45 Hybrid Electromagnetic Simulations Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 294 KB |
| Title: | Evaluation of FDTD regimes for scattering from periodic structures |
| File Type: | Conference Paper |
| Issue: | Volume: Applications Based on FDTD Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 262 KB |
| Title: | Estimation of the Probability Density Function in Electromagnetic Propagation Problems with the Unscented Transform and TLM |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Transmission-Line Matrix (TLM) Analysis Methods Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 213 KB |
| Title: | Equivalent Network Approach for the Simulation of MEMS Devices |
| Abstract: | In this paper a numerical approach for the analysis of the behaviour of micro electro mechanical systems (MEMS) is presented. The method is applied to the simulation of movable plate MEMS variable capacitors that are of common use in the CMOS voltage controlled oscillators (VCOs). An accurate study of MEMS devices requires a coupled electro-mechanical analysis. The mechanical analysis has to take into account the deformation of the plates of the capacitor and the electromagnetic one has to consider the distribution of charges and currents and the presence of dielectric materials. We first perform a coupled elastic-electrostatic analysis in order to obtain the tuning characteristic of the system; subsequently, once the positions of the plates have been determined, an electromagnetic analysis of the system is performed via an integral formulation based on an electric equivalent circuit. The proposed method has been validated by analysing two and three plate tuneable parallel-plate capacitors. |
| Author(s): | S. Barmada, A. Musolino, R. Rizzo, S. Barmada, A. Musolino, R. Rizzo |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 1 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 454 KB |
| Title: | EMAP5: A 3D Hybrid FEM/MOM Code |
| Abstract: | EMAP5 is a numerical software package designed to model electromagnetic problems. It employs the finite element method (FEM) to analyze a volume, and employs the method of moments (MoM) to analyze the region exterior to the FEM volume. The two methods are coupled by enforcing the continuity of the tangential fields on the interface. Dielectrics, lossy dielectrics, and metal objects can be modeled within the FEM volume. Metal objects can also be located exterior to, or on the surface of the FEM volume. A simple input file translator (SIFT) is provided with EMAP5 that allows users to define basic input configurations on a rectangular grid without a graphical interface. It is also possible to use commercial mesh generators to analyze more complex geometries of arbitrart shape. EMAP5 can model three types of sources: incident plane waves, voltage sources on metal patches and impressed current sources in the finite element region. This paper describes the implementation of EMAP5 and provides four examples to demonstrate the range of coonfigurations that EMAP5 is capable of modeling using the SIFT translator. |
| Author(s): | Y. Ji, T. Hubing, Y. Ji, T. Hubing |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 1 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 3652 KB |
| Title: | EM Scattering from Bodies of Revolution using the Locally Corrected Nystrom Method |
| Abstract: | The locally corrected Nystr¨om method is applied to the magnetic field integral equation for a conducting body of revolution. A construction method is presented for the locally corrected weights for the resulting one-dimensional coupled scalar magnetic field integral equations. Special attention is paid to minimizing the cost for multi-frequency computations. Numerical results are presented for the sphere, oblate spheroid, and right circular cylinder. Good agreement with results from mature moment method codes is observed. |
| Author(s): | A. W. Wood, J. L. Fleming, A. W. Wood, J. L. Fleming |
| File Type: | Journal Paper |
| Issue: | Volume: 23 Number: 4 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 649 KB |
| Title: | EM Scattering from Bodies of Revolution using the Locally Corrected Nystrom Method |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | EM Scattering from Bodies of Revolution using the Locally Corrected Nystrom Method |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Sessions 1 Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 144 KB |
| Title: | Two-Dimensional Pattern Scanning by Linear Phased Array with Pattern Reconfigurable Elements |
| Abstract: | In this paper, a linear phased array with pattern reconfigurable elements is studied to perform a two-dimensional pattern scanning. Compared with the traditional linear array, the new linear array can scan the patterns in two-dimensional directions??i.e. -direction and -direction. The results indicate that the main beam of the proposed array can continuously scan from =30o to =150 o in the E-plane by adjusting the feed phases of reconfigurable elements and from =-50o to =50o in the H-plane by switching the elements operating states. |
| Author(s): | Y. Bai, S. Xiao, B. Wang, S. Gao |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 2 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 374 KB |
| Title: | Transient Modeling of Magnetoelastic Problems in Electric Machinery |
| File Type: | Conference Paper |
| Issue: | Volume: Ship Propulsion System Utilizing Superconducting Components Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 651 KB |
| Title: | Time Delay Signature of Chaotic Nanolasers and its Concealment |
| File Type: | Conference Paper |
| Issue: | Volume: S05 Novel Photonic Material and Devices I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 468 KB |
| Title: | The Influence of Shape on the Properties of Small Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using WIPL-D Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 251 KB |
| Title: | The Electrically Small Dipole Loop |
| Abstract: | A square loop, with feed at the center of one side, can be combined with a dipole, where the dipole is parallel with the loop axis, and shares the feed point; see Fig. 1. With the dipole length twice the loop side, there will be a frequency where the dipole reactance and loop reactance are equal and opposite. It has been suggested [1,2] that this loop dipole together with a second loop dipole fed 90 deq. out of phase provides broadband performances, in fact a Q equal to zero. The plane of the second loop dipole is normal to the plane of the first loop dipole. Because stored energy is an inevitable feature of electrically small antennas, the loop dipole is examined to determine bandwidth capabilities |
| Author(s): | R.C. Hansen, R.C. Hansen |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 3 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 184 KB |
| Title: | The Effect of Fabrication Tolerances on a Suspended Plate Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S19 Modeling with FEKO Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 624 KB |
| Title: | The Design of a High Gain Dual-Polarized Quad-Ridged Circular Horn Antenna for Wideband EMC Test Applications |
| Abstract: | This paper presents the design of a high gain broadband quadruple-ridged circular horn antenna for Electromagnetic Compatibility (EMC) testing. The proposed antenna contains a wideband feed structure as a transition between coaxial line and quad-ridged circular waveguide behind the conical horn antenna. The wideband matching between impedances at the apertures of the feed and the horn is achieved with a tapering at the flare section along the horn length, which is obtained after a detailed investigation of various tapering profiles. The antenna is designed to operate in horizontal and vertical polarizations (dual linear polarization) simultaneously in EMC tests. This implementation is found to present a return loss greater than 10 dB, isolation level higher than 28 dB, high-gain (minimum 13.6 dBi) and low-gain variation of 4.5 dBi within the frequency range of 1-6.75 GHz (6.75:1 bandwidth) at both polarizations, which is a desired feature in radiated emission and immunity tests. |
| Author(s): | B. Solak, M. Secmen, A. Tekin |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 9 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2407 KB |
| Title: | Suspended ring resonator method for measurement of dielectric permittivity for bulk foam samples in L/S bands |
| File Type: | Conference Paper |
| Issue: | Volume: Poster Session Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 720 KB |
| Title: | Sub-6 GHz Quad-Band Reconfigurable Antenna for 5G Cognitive Radio Applications |
| Abstract: | This article describes a quad-band frequency tunable antenna for 5G applications that operates in the sub-6 GHz frequency range. On the top side, a stubloaded square patch is printed on an inexpensive glass epoxy substrate, and on the opposite side, a C-shaped slot embedded into the partial ground plane. To achieve frequency reconfigurability with a consistent radiation pattern, the C-shaped slot and matching stub are used. The antenna is electronically frequency tunable by placing two positive intrinsic negative diodes (PIN) in the C-shaped slot and one PIN diode between the stub and feed line. The frequency is tunable between one ultra-wideband (UWB) and three communication bands based on the switching conditions of the PIN diodes. The proposed configuration is small, with a substrate dimension of 25×25×1 mm3. The antenna was fabricated, tested and found measurements result back up the simulation; it can switch between UWB (3.31.0-6.03 GHz) and three communication modes (3.31-4.32, 3.78- 4.98, 4.98-5.96 GHz). The antenna has peak gains of 1.91, 1.86, 2.0 and 2.0 dB, and radiation efficiencies of 80, 78, 83 and 86%, respectively, in the four frequency bands. The developed antenna is ideally suited for multi-functional wireless systems and cognitive radio applications since it covers the frequency bands below 6 GHz and is tunable between wide and narrow bands. |
| Author(s): | S. Ellusamy, R. Balasubramanian |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 8 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2991 KB |
| Title: | Stability Experiment of the High-Speed Active Magnetic Bearing-Flywheel System in the Rotating Frame |
| Abstract: | The active magnetic bearings (AMBs) can greatly improve the stability of the flywheel system and increase the maximum flywheel speed. However, if the active magnetic bearing-flywheel system (AMB-FS) is placed in a rotating frame, the strong gyroscopic effect of high-speed flywheel will greatly affect the system stability. In this study, to realize the high stability of the AMB-FS at ultra-high flywheel speed with low power consumption, the cross feedback PID control was applied in the AMB-FS. The system stability and the performance of AMBs were studied. In the experiment, the gyroscopic effect of the flywheel was effectively suppressed. In the vacuum environment, the flywheel could runs stably at any speed within the range of 0 to 30000 rpm, and the power consumption of AMBs was only 17.82 W and the system had no need of cooling measures. The flywheel speed could exceed 31200 rpm and still possessed the speeding potential. The rotating frame test showed that the maximum frame rotational speed could reach 3.5 deg/s at the rated flywheel speed of 30000 rpm, and the AMBFS run stably. |
| Author(s): | J. Yu, Y. Zhou, H. Zuo, K. Zhang, P. Liu, Y. Li, P. Pu, L. Zhao, Z. Sun |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 4 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2353 KB |
| Title: | Stability Analysis for a Flywheel Supported on Magnetic Bearings with Delayed Feedback Control |
| Abstract: | In this paper, the model of the rotor dynamics of the flywheel is given using a rigid rotor supported on magnetic bearings. The phase lag of the control loop is modeled by a simple time delay. Limits of stability and the associated vibration frequencies are described in terms of nondimensional magnetic bearing stiffness and damping and nondimensional parameters of flywheel speed and time delay. Compared to the theoretical values, the simulation results and experimental measurements show the stability boundaries of the PD controller have the same qualitative tendencies. |
| Author(s): | L. L. Zhang, J. H. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 8 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2195 KB |
| Title: | Spiral Patch Antenna at 12 GHz |
| File Type: | Conference Paper |
| Issue: | Volume: S10 EM Simulations using Sonnet I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 371 KB |
| Title: | Space Antenna Feed Design at ALCATEL ALENIA SPACE (F) |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Antenna Applications Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 195 KB |
| Title: | Some Investigations on Reflector Antenna Performance by Employing a Triple Mode Feedhorn Using FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using FEKO I Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 740 KB |
| Title: | Small Low Power Rectenna for Wireless Local Area Network (WLAN) Applications |
| Abstract: | In this paper, a novel design of small low power rectenna operating on WLAN band with high harmonic rejection is presented. By using rotated E-shaped strip in the radiating patch, a new resonance at lower frequency (2.4 GHz) can be achieved. Also, by cutting a rectangular slot with protruded interdigital strip inside the slot in the feed line, a frequency band-stop performance can be achieved. The proposed structure has a major advantage in high harmonic rejection. The rectenna with integrated monopole antenna can eliminate the need for a Low Pass Filter (LPF) placed between the antenna and the diode as well as produce higher output power, with maximum conversion efficiency of 74% using a 1 K resistor at a power density of 0.3 mW/cm². |
| Author(s): | S. Jahanbakhsh, M. Ojaroudi, S. Kazemi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 3 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 527 KB |
| Title: | Size-Reduced Patch-Antenna Feedpoint Parametric Study |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Wideband and Multiband Antennas Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 269 KB |
| Title: | Six-Channel Diplexer using Stub-Loaded Stepped Impedance Resonators |
| Abstract: | In this paper, a compact six-channel diplexer with low insertion loss and high isolation level is presented. The diplexer consists of two tri-band bandpass filters (BPFs), two meander transmission lines and hookshaped feeding lines. The BPFs are designed based on stub-loaded stepped impedance resonators (SLSIRs). Based on even- and odd-mode (EOM) analysis of the resonator, there are two resonant modes that operate at the same frequency. For splitting the two modes, stubstub coupling is employed here. The combination of the two BPFs is implemented by utilizing two meander transmission lines as the impedance matching network. Finally the proposed diplexer operating at 1.46/1.74/2.96 GHz (for Load 1) and 0.89/1.15/2.40 GHz (for Load 2) is fabricated and measured. A good agreement between simulated and measured results evidently validates the proposed diplexer. |
| Author(s): | J. Liu, T. Su, H. Lv, L. Lin, B. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 10 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1678 KB |
| Title: | Single-Fed Circularly Polarized Dielectric Resonator Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling by WIPL-D Code Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 176 KB |
| Title: | Single Feed Dual-Band RHCP Dielectric Resonator Antenna for GNSS Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 710 KB |
| Title: | Single Fed Dual Band RHCP Patch Antenna Design |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications using WIPL-D Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 1890 KB |
| Title: | Simulations of a Shaped Dielectric Lens Antenna by FEKO |
| Abstract: | In the Intelligent Transportation System (ITS), millimeter waves are used and antennas are requested to have beam scanning ability. In the millimeter wave operation, a dielectric lens antenna is one of the prominent candidates. Authors designed a shaped dielectric lens antenna based on the Abbe’s sine condition. Wide angle beam scanning characteristics were ensured through the ray tracing calculations and radiation pattern measurement. Recently, owing to the enhancement of electromagnetic simulator abilities, simulations of a dielectric lens antenna become possible. By employing an electromagnetic simulation, it is expected that detailed electrical performances of both the feed horn and the dielectric lens will be made clear. In this paper, electromagnetic simulations of a shaped dielectric lens antenna by FEKO suit 5.3 are conducted. First, the corrugate horn used for the feed horn is electromagnetically simulated. Excellent simulated radiation patterns coinciding with the measured results are achieved. Next, the feed horn radiation patterns are combined with the dielectric lens simulations. And simulation results of beam scanning characteristics are obtained. When comparing the simulated scanned beam shapes with the measured results, very good agreements are obtained. So, accuracies of simulations are ensured. Moreover, unexpected sidelobe increases in the specific wide angle region that were pointed out previously are studied. Simulated and measured results can confirm the sidelobe increases. As an additional study, electrical field distributions in the dielectric lens are simulated. Then, multiple reflections between lens surfaces are visually made clear. The reason of sidelobe increases can be clearly understood. As a result, it is confirmed that the FEKO simulator can rigorously simulate electromagnetic characteristics of a shaped dielectric lens antenna. |
| Author(s): | Y. Tajima, Y. Yamada |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 4 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 1594 KB |
| Title: | Simulations of a Shaped Dielectric Lens Antenna by FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO – I Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | Simulations of a Shaped Dielectric Lens Antenna by FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling using FEKO – I Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 2060 KB |
| Title: | Sidelobe Reduction in Linear Microstrip Arrays Driven through Microstrip Corporate Feeds |
| File Type: | Conference Paper |
| Issue: | Volume: S11 Antenna Design I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 314 KB |
| Title: | Short Electromagnetic Pulse Probe Fed by Tow-Coaxial Balun: Sensitivity and Bandwidth Examining |
| File Type: | Conference Paper |
| Issue: | Volume: Wideband Antennas Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 4445 KB |
| Title: | Shape Synthesis of Multi-mode Dielectric Resonator Antennas Using Characteristic Modes |
| File Type: | Conference Paper |
| Issue: | Volume: S22 Advances in Hybrid Material Additive Manufacturing of Antennas Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 127 KB |
| Title: | Shape Synthesis of Multi-mode Dielectric Resonator Antennas Using Characteristic Modes |
| Abstract: | This paper demonstrates a shape synthesis technique for multi-mode dielectric resonator antennas using binary genetic algorithm and characteristic mode analysis. The cost function for the synthesis process is defined from characteristic modal parameters, such as modal quality factors and self-resonance frequencies. Since only modal parameters are involved in the cost function, the shape synthesis process is made independent of feeds. In the paper, we demonstrate the shape synthesis of a DRA with three self-resonant modes at 3 GHz. |
| Author(s): | B. Yang, A. Eroglu, J. J. Adams |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1076 KB |
| Title: | Series-fed Dipole Array for Near-field RFID Application |
| Abstract: | In this paper, the series-fed dipole array is proposed and studied for near-field radio frequency identification (RFID) applications. The dipole array is composed of several dipoles with a series feed line. Closed form expressions for current distribution and near-field distribution are presented in this paper. To verify the feasibility of this kind of antenna as a reader antenna in near-field ultra-high frequency (UHF) RFID, a prototype that contains three dipoles is designed, fabricated and tested. The theoretic analysis, simulations and experiments agree well and it is shown that the series-fed dipole array is capable of generating strong magnetic field over a rectangular area, which is very useful in near-field UHF RFID applications. |
| Author(s): | Y. Wang, L. Shen, C. Huang, J. Zhu, W. Tang |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 11 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2050 KB |
| Title: | Scanning of the Near-field Focused Beam by Changing Frequency |
| Abstract: | A new antenna array system is introduced which enables the movement of a near-field focused beam by change of frequency. The shift in the beam is achieved by using multi-wavelength transmission lines between successive elements of the array. At the designed frequency the beam is focused at the focal point. Due to the differences in the transmission line lengths feeding the antenna elements, a progressive phase change occurs between these elements. These phase differences between the elements cause a shift in the beam position. An 8×8 patch antenna array system was designed at 2.4 GHz on a microstrip to implement the proposed system. Two substrates were used: one for the patch antenna array and the other one for the feed network and transmission lines. A full-wave simulation model was used to analyze this design and demonstrate the movement of the beam. For this design, the focused beam is moved 310 mm by changing the frequency from 2.2025 GHz to 2.5750 GHz. |
| Author(s): | M. Sohail, R. Uyguroglu, A. Y. Oztoprak |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 3 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 586 KB |
| Title: | Ruggedized Reconfigurable Antennas through the Implementation of Innovative Mechanical Techniques |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Reconfigurable Metamaterials and Antennas Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 204 KB |
| Title: | Rectangular Slotted Square Patch Antenna with a Floating Ring |
| File Type: | Conference Paper |
| Issue: | Volume: S14 EM Simulations using Sonnet II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 702 KB |
| Title: | Radiation by a Linear Array of Half-Width Leaky-Wave Antennas |
| Abstract: | Abstract—Leaky-wave antennas are interesting apertures for a variety of applications due to their low profile and wide bandwidth. They are inherently traveling wave antennas, and hence are best suited for end-fire applications. A new type of leaky-wave antenna, the halfwidth leaky-wave antenna (HWLW), has been recently investigated and found to have similar radiation properties as its full-width leaky-wave (FWLW) counterpart, but only requiring half the transverse dimension. In addition, the feeding mechanism for a HWLW antenna is considerably simplified compared to the FWLW antenna. This paper discusses arraying these antennas to provide both increased gain and scanning capability. It will be seen that arraying HWLW antennas is more complex than its narrowband counterpart, the patch antenna. |
| Author(s): | Daniel Killips, Joshua Radcliffe, Leo Kempel, Stephen Schneider, Daniel Killips, Joshua Radcliffe, Leo Kempel, Stephen Schneider |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 3 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 982 KB |
| Title: | Radiation by a Linear Array of Half-Width Leaky-Wave Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Phased Arrays Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 217 KB |
| Title: | PSO Algorithm Combined with Parallel Higher-Order MoM to Compensate the Influence of Radome on Antennas |
| Abstract: | For the design and optimization of radome-enclosed antenna arrays, a fast numerical optimization algorithm is proposed to compensate the distortion error of radome-enclosed antenna arrays by correcting amplitude and phase of the excitations. Higher-order method of moments (MoM) is used to extract the eigen solution for each antenna element. In combination with the particle swarm optimization (PSO) algorithm, the antenna radiation characteristics can be quickly obtained by updating feeds, which avoid the repeated solution of the MoM matrix equation in the optimization process. Meanwhile, in the process of the eigen solution extraction, the use of the parallel technique significantly accelerates the solving of matrix equation. Finally, a radome-enclosed antenna array with 247,438 unknowns was optimized as an example, and the numerical results demonstrate effectiveness of the method. |
| Author(s): | C. Zhai, X. Zhao, Y. Wang, Y. Zhang, M. Tian |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 3 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1740 KB |
| Title: | Probe Feed E-Shaped Patch Antenna at 4.87 GHz |
| Abstract: | In this paper, E-shape microstrip patch antenna for wireless communication is designed, simulated, built and tested. The operating frequencies of antenna are 2.97 GHz and 4.85 GHz, the substrate FR4 is used for proposed antenna with dielectric constant 4.01 and 1.7mm thickness. Two parallel slots are cut to perturb the surface current path to achieve dual resonance. The E-shape has return loss of -28 dB and -14.03 dB at operating frequencies 2.97 GHz and 4.85 GHz respectively. Designing and simulation of this antenna has been done by the help of Sonnet Software. This antenna is fed by a co-axial probe feeding. In this paper, the effects of length difference among antenna legs has been studied. |
| Author(s): | E. Kucuk, B. Bayram, S. T. Imeci, T. Durak |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1371 KB |
| Title: | Predicting and Mitigating Techniques of the PCB RectangularPower/Ground Planes' Resonance Modes |
| File Type: | Newsletter Paper |
| Issue: | Volume: 22 Number: 3 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 327 KB |
| Title: | Physical coaxial feed model for antenna simulations using EFIE with Calderon preconditioner |
| File Type: | Conference Paper |
| Issue: | Volume: Antenna Modeling, Simulation, and Validation Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 137 KB |
| Title: | Performance of Vivaldi Antennas in Reflector Feed Applications |
| Abstract: | When a wideband antenna is to be used as a reflector feed, the phase center variation with frequency introduces an error on the phase of the primary field impinging on the reflector surface. This is because the antenna phase center will be coincident with the focus only at one particular frequency and displacement at other frequencies, which will result as the phase error losses due to axial defocusing. Tapered slot antennas are the most utilized antennas in ultra wide band (UWB) high-performance applications. In this work, performance of the UWB Vivaldi antennas (exponentially tapered slot antennas) in reflector feed applications is investigated. A long Vivaldi is designed, manufactured, and its phase center movement with frequency is measured. The correspondent phase error loss is estimated. |
| Author(s): | N. T. Tokan |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 9 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 312 KB |
| Title: | PERFORMANCE OF THE GENERALIZED MULTIPOLE TECHNIQUE (GMT/MMP) IN ANTENNA DESIGN AND OPTIMIZATION |
| Abstract: | During the last decade, the generalized multipole technique (GMT) has been extensively studied, improved and applied to many electromagnetics problems such as bioelectromagnetics, optics, waveguides and electromagnetic compatibility (EMC), but little has been reported towards utilizing this method for antenna design and optimization. On the other hand, the few published examples of simple dipoles and helices in the close vicinity of lossy scatterers have suggested the potential significance of GMT for antenna design purposes. In this paper, the applicability of the GMT based 3D multiple multipole (3D MMP) code for simulation of wire antenna has been investigated. To evaluate the advantages and limitations of 3D MMP, several basic types of wire antenna configurations were simulated. These were linear and linear array, helical, and physically constrained low profile antennas. To validate the method's performance, we calculated radiation patterns, impedance, return loss, reflection coefficient, VSWR, and compared them to available results from experiments and/or results published by others using different techniques. This investigation showed several conceptual advantages of this technique for antenna simulations. Furthermore, the thin-wire expansion in combination with multipoles and roof top functions provides a great degree of flexibility in modeling. The most recently implemented expansion, "line multipoles," extends the code's efficiency to non-thin-wire configurations (e.g., helix with small ratio of pitch to wire diameter). Critical issues of modeling are the feedpoint and wire tip area, matching point locations and segment length-to- diameter ratio. Symmetries are used where possible to minimize computation time without loss of generality as any antenna element may easily be assembled in non- symmetrical configurations with the block-iterative solver. In order to achieve better confidence on more complex configurations, extensive studies were performed to increase efficiency and stability of modeling and will be discussed. In addition, the numerical validation techniques were extended to satisfy the special requirements of antenna simulations. These studies demonstrate the potential of GMT/MMP for use in analysis, synthesis and optimization of antennas. [Vol. 9, No. 3 (1994), Special Issue on Generalized Multipole Technique (GMT), pp 79-89] |
| Author(s): | Roger Yew-Siow Tay, Niels Kuster, Roger Yew-Siow Tay, Niels Kuster |
| File Type: | Journal Paper |
| Issue: | Volume: 9 Number: 3 Year: 1994 |
| Download Link: | Click here to download PDF File Size: 3160 KB |
| Title: | Performance analysis of MoM patch antenna simulations - RWG basis functions |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Computational Techniques for System Design Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 1009 KB |
| Title: | Perforated Dielectric Resonator Antenna Reflectarray |
| Abstract: | A wideband perforated rectangular dielectric resonator antenna (RDRA) reflectarray is presented. The arrays of RDRA are formed from one piece of materials. Air-filled holes are drilled into the material around the RDRA. This technique of fabricating RDRA reflectarray using perforations eliminates the need to position and bond individual elements in the reflectarray and makes the fabrication of the RDRA reflectarray feasible. The ground plane below the reflectarray elements is folded as a rectangular concave surface so that an air-gap is formed between the RDRA elements and the ground plane in order to increase the bandwidth. Full-wave analysis using the finite integration technique is applied. Three cases are studied. In the first one, the horn antenna is placed at the focal point to illuminate the reflectarray and the main beam in the broadside direction. In the second one, the horn antenna is placed at the focal point and the main beam at ±30 degrees off broadside direction. In the third one, an offset feed RDRA reflectarray is considered. A variable length RDRA provides the required phase shift at each cell on the reflectarray surface. The normalized gain patterns, the frequency bandwidth, and the aperture efficiency for the above cases are calculated. |
| Author(s): | S. H. Zainud-Deen, S. M. Gaber, A. M. Abd-Elhady, K. H. Awadalla, A. A. Kishk |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 10 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 733 KB |
| Title: | Patch Antenna Size-Reduction Parametric Study |
| Abstract: | Size-reduction techniques are applied to a circular UHF patch antenna, by varying parameters to better predict its desired resonant frequency. Specifically, slits are introduced into the patch, which are parametrically varied to determine the optimum slit dimensions for maximum size reduction. Further studies determine the optimum location for the probe feed, to achieve 50omega input impedance for different slit lengths. |
| Author(s): | R. L. Musselman, J. L. Vedral |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 2 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1672 KB |
| Title: | Particle Swarm Optimization Applied to EM Problems |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Electromagnetic Modeling by WIPL-D Software Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 339 KB |
| Title: | Parametric Study of Sinc Shaped Monopole Antenna for Wireless Devices |
| Abstract: | In this work, a Sinc shaped printed monopole antenna is proposed for wireless devices. The radiating element is a strip monopole configuration folded in the shape of a Sinc function where the radiating element is an extension of 50 ? microstrip line. The proposed antenna not only represents a compact configuration but is easier to design and feed. Several configurations of truncated Sinc(2x) monopole geometry are taken into consideration to show the resonance behavior at single, two or more than two frequencies for multifrequency operation. The detailed parametric study has been carried out in terms of several truncated Sinc configurations, ground plane size, feed gap and Sinc strip length to achieve the desired band of operation. The design formula is also presented for the proposed monopole antenna. Finally, a prototype model is developed and the simulated results are validated experimentally for a particular configuration. It is seen that the proposed antenna occupies small area, depicts good radiation characteristics and is suitable for wireless devices operating at DCS/PCS/IMT-2000/UMTS frequencies. |
| Author(s): | R. K. Badhai, N. Gupta |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 1 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 2657 KB |
| Title: | Parametric Modeling for Curved Slots of Vivaldi Antenna Based on Artificial Neural Network |
| Abstract: | This paper proposes an artificial neural network (ANN) model based on parametric modeling for curved slots of the Vivaldi antenna. A more effective processing method is achieved by feeding ANN with the point positions that produce curved edges via cubic spline interpolation rather than the picture of metallic patches. The predicted results of ANN, including S-parameter and gain, agree well with those from the full-wave simulation. With the trained model, a Vivaldi antenna with the lower cut-off frequency is optimized by the multi-objective genetic algorithm. |
| Author(s): | W.-H. Su, W. Shao, H. Ou, S.-J. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 9 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 7693 KB |
| Title: | Parametric Design of Open Ended Waveguide Array Feeder with Reflector Antenna for Switchable Cosecant-Squared Pattern |
| Abstract: | This paper presents parametric analysis of two-dimensional (2D) open-ended waveguide array feeder and introduces a modified parabolic reflector antenna structure to obtain electronically switchable radiation patterns. The main motivation of the study is to achieve desired radiation characteristics for naval, air and coastal surveillance radars such as, pencil beam, suppressed side lobes and cosecant-squared pattern shapes. The Analytical Regularization Method (ARM) is used as a fast and accurate predesign tool to compute near and far field radiation characteristics of the feeder and reflector antennas. The numerical procedure is initially verified by the analytical methods and the calculated results are presented for the proposed novel designs. |
| Author(s): | O. M. Yucedag, A. S. Turk |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 8 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1297 KB |
| Title: | Parametric Design of 2DOffset Reflector Antennas for Surveillance Radars with Analytical Regularization Method |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling and Simulation in Electromagnetic Engineering Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 144 KB |
| Title: | Parametric Design of 2D Cassegrain ReflectorAntenna Structures with Analytical Regularization Method |
| File Type: | Conference Paper |
| Issue: | Volume: Applications of Electromagnetic Simulation for Designing and Analysis of Antennas and Radio Propagations Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 250 KB |
| Title: | Parametric Analysis of Multi Source Feeding Flare Rolling and Corrugating Effects for H-Plane Horn Radiator |
| Abstract: | In this paper, radiation characteristics of H-plane sectoral horn antenna are treated systematically by investigation of the multi source feeding, flare wall rolling and corrugating effects. The analytical regularization method (ARM) is used to solve the problem of E-polarized wave diffraction in a fast and accurate way. The numerical procedure is initially verified by the analytical solutions, and the calculated field patterns are presented for the selected horn antenna configurations. Proper choices of the geometrical parameters, such as source position, back wall shape, multi source feed, metal thickness, and ridged and corrugated flares are proposed for the designers to reach high directivity, narrow beam, and suppressed side and back lobe levels. |
| Author(s): | A. S. Turk, O. Yurduseven |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 11 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 449 KB |
| Title: | Optimum Horn Antenna Design Based On an Integration of HFSS Commercial Code and Genetic Algorithms for the Feed Application of Reflector Antennas |
| Abstract: | The optimum design of horn antennas for the application as feeds to reflector antennas is performed utilizing a simulation tool based on an integration of HFSS commercial code as an electromagnetic computational engine and an add-on optimization scheme of genetic algorithm. This work is motivated by the need of antenna operations at multiband frequencies, where the horn antennas tend to radiate narrower beams at higher frequencies and result in inefficient uses of the reflector surface since the narrow beams will illuminate only a portion of the reflector surface. Optimum design of the horn antenna may significantly increase efficiency. The philosophy of this work is based on a fact that the currently available commercial codes are reliable and relatively accurate in the analysis with more efforts tending to enhance the computational efficiency. The quality of the antenna design will mainly rely on an effective optimization algorithm that can be and should be developed independently according to engineers’ own need, since the variables and cost functions for optimization can be flexibly selected. The integration of existing analysis codes, as mentioned above, and self-developed algorithms will be most effective for an engineer in the customized antenna design. The concepts and strategies are addressed with numerical examples to validate. |
| Author(s): | H. Chou, C. Liu, H. Chou, W. Liao |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 2 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 848 KB |
| Title: | Optimum Design of Conformal Array Antenna with a Shaped Radiation Pattern and Wideband Feeding Network |
| Abstract: | In the present work, a circular conformal array with wideband printed dipole antennas and wideband feeding network has been designed to obtain a fully constrained cosecant squared radiation pattern using particle swarm optimization (PSO) algorithm and mutual coupling compensation. Using the circular conformal design leads to a decrease of around 33% of the length of the array antenna compared with that of the vertical linear array. Moreover, a better performance of the coverage region and side lobe fall after this area obtains by using this configuration. |
| Author(s): | M. H. Rahmani, A. Pirhadi |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 1 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 1073 KB |
| Title: | Optimizing Optical Negative Index Materials: Feedback from Fabrication |
| File Type: | Conference Paper |
| Issue: | Volume: Nature-Based Stochastic Optimization Methods Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 1090 KB |
| Title: | Optimization of High-Directivity Fan-Beam Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: 3-3-A Applications of Evolutionary Algorithms in Electromagnetics Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 326 KB |
| Title: | Optimization of a Dual-Band, Printed Octafilar Antenna |
| Abstract: | This paper presents several innovative techniques for the design and optimization of a dual band, octafilar helix antenna. The technical challenge of this design is how close the two bands of operation are, as well as the requirement to fit inside a radome with .07λ diameter and .33λ length. This was achieved through a novel technique of applying differing pitches and terminations to the upper and lower frequency antenna filars and then feeding them from a similar location at the base. This allowed for optimal current distribution on each of the two antenna filars. The final design produced gain greater than 0dBic at zenith across both bands of operation. The techniques discussed in this paper were seen to grow low frequency performance by as much as 2.5dBic over a typical octafilar design of the same size. |
| Author(s): | J. D. Majkowski |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 12 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2573 KB |
| Title: | Optimization of a Circularly Polarized Single-Feed UHF Patch Antenna on a Nanosatellite Metal Platform |
| File Type: | Conference Paper |
| Issue: | Volume: Bianisotropic and Metamaterial Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 1325 KB |
| Title: | On the Design and Simulation of Antennas on Ultra-thin Flexible Substrates |
| Abstract: | Flexible wireless systems are rapidly evolving in a wide spectrum of applications such as medical, entertainment and sport facilities. The aim of this paper is to investigate whether the ultra-thin substrates along with their permittivity are essential for the initial design stage of a flexible antenna, which is a key element of any wireless system, or it is merely a supporting structure. Three state-of-the-art simulation tools are used to evaluate the scattering parameter, S11 which are then compared against precise measurements conducted inside an anechoic chamber. These methods are the Finite Integration Technique (FIT) based Time Domain Solver (TDS) and the Finite-Element Method (FEM) based Frequency Domain Solver (FDS) of CST Microwave Technology and the (FEM) based HFSS of ANSYS. This paper attempts to provide an answer as to whether the substrate and other geometrically small features such as the feeding structure should be sufficiently discretized or else conventional default adaptive meshing should be enough. Three different flexible antennas with two fabrication techniques and feed lines have been used in the simulations and measurements. |
| Author(s): | A. Kashkool, S. Yahya, H. Al-Rizzo, A. Al-Wahhamy, A. A. Issac |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 7 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1629 KB |
| Title: | On the Design and Simulation of Antennas on Ultra-thin Flexible Substrates |
| Abstract: | Flexible wireless systems are rapidly evolving in a wide spectrum of applications such as medical, entertainment and sport facilities. The aim of this paper is to investigate whether the ultra-thin substrates along with their permittivity are essential for the initial design stage of a flexible antenna, which is a key element of any wireless system, or it is merely a supporting structure. Three state-of-the-art simulation tools are used to evaluate the scattering parameter, S11 which are then compared against precise measurements conducted inside an anechoic chamber. These methods are the Finite Integration Technique (FIT) based Time Domain Solver (TDS) and the Finite-Element Method (FEM) based Frequency Domain Solver (FDS) of CST Microwave Technology and the (FEM) based HFSS of ANSYS. This paper attempts to provide an answer as to whether the substrate and other geometrically small features such as the feeding structure should be sufficiently discretized or else conventional default adaptive meshing should be enough. Three different flexible antennas with two fabrication techniques and feed lines have been used in the simulations and measurements. |
| Author(s): | A. Kashkool, S. Yahya, H. Al-Rizzo, A. Al-Wahhamy, A. A. Issac |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 7 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1629 KB |
| Title: | On Compact Wideband Antenna Design Using Topology Modifications |
| File Type: | Conference Paper |
| Issue: | Volume: S04 Antenna Optimization for RFID Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 365 KB |
| Title: | Omni-Directional/Multi-Resonance CPW-Fed Small Slot Antenna for UWB Applications |
| Abstract: | In this paper, a novel multi-resonance small slot antenna with CPW feed-line and square radiating stub, for UWB applications is proposed. The proposed antenna consists of a square radiating stub with an inverted T-shaped slot and a ground plane with a T-shaped slit, which provides a wide usable fractional bandwidth of more than 145 % (1.89 GHz ? 12.43 GHz). By cutting a Tshaped slit with variable dimensions on the ground plane, and an inverted T-shaped slot in the square radiating stub additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the lower and upper bands. The proposed antenna displays a good omni-directional radiation pattern even at higher frequencies. The designed antenna has a small size of 30×30 mm2. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range. |
| Author(s): | A. Kamalvand, Ch. Ghobadi, J. Nourinia, M. Ojaroudi, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 9 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 387 KB |
| Title: | Octave-Band Monopole Antenna with a Horseshoe Ground Plane for Wireless Communications |
| Abstract: | In this manuscript, a new design of octaveband monopole antenna with multi-resonance characteristic is presented .The antenna consists of a fork-shaped radiating patch with three pairs of teeth, a feed-line and a horseshoe ground plane. Simulated and measured results show that the antenna design exhibits an operating bandwidth (VSWR<2) from 2 to 20 GHz, which provides a wide usable fractional bandwidth of more than 160%. The proposed antenna has a symmetrical structure, therefore displays a good omnidirectional radiation pattern even at higher frequencies. The designed antenna has a very small size of 15×17 mm2 and the impedance bandwidth of the designed antenna is higher than the other antennas reported in the literature to date. The proposed antenna configuration is simple, easy to fabricate and can be integrated into UWB systems. |
| Author(s): | M. M. Abdollahi, N. Ojaroudi, M. Mehranpour, F. Ghiasvand |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 7 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1023 KB |
| Title: | Numerical De-embedding of Periodic Guided-wave Structures via SOL/SOC in FEM Algorithm |
| Abstract: | This paper presents a 3D full-wave finite element method (FEM) combined with short-open-load (SOL) and short-open calibration (SOC) technique. Due to the effective calibration of the port discontinuities between the feeding line and periodic structure, both SOL and SOC can successfully extract the intrinsic unite-length parameters, i.e., complex propagation constants and effective characteristic impedances. Distinctively, the SOL can be easily implemented with the commercial software such as Ansys HFSS, which is widely applicable for various kinds of periodic structure. More importantly, the SOC incorporated within the FEM algorithm intrinsically reduces the requirement of the load standard in SOL. Also, the SOC in FEM will be independent with the absorbing boundary condition at the port. And the port information such as characteristic impedance and propagation constants at the designated port will not be required in advanced, thereby allowing the arbitrary implementation of non-uniform feeding structures. In order to demonstrate the efficiency and accuracy of our proposed approaches, two numerical examples are given out for verification. |
| Author(s): | Y. Li, D. Xie, L. Zhu |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 6 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1406 KB |
| Title: | Numerical De-embedding of Periodic Guided-wave Structures via SOC/SOL in FEM Algorithm |
| File Type: | Conference Paper |
| Issue: | Volume: 6-ME-4 Student Paper Competition II Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 251 KB |
| Title: | Numerical Analysis of a Printed E-Field RF Probe-Array Used for Rapid SAR Assessment |
| File Type: | Conference Paper |
| Issue: | Volume: Computational RF and Thermal Dosimetry Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 498 KB |
| Title: | Numerical Analysis and Design of a New Simple Compact Ultra-Wideband Dielectric Resonator Antenna with Enhanced Bandwidth and Improved Radiation Pattern |
| Abstract: | A new simple compact ultra-wideband (UWB) dielectric resonator antenna (DRA) is presented. The finite-difference time-domain (FDTD) method is used to the full-wave analysis of this structure. The antenna consists of a modified stepped microstrip fed monopole printed antenna loaded with a rectangular dielectric resonator, truncated ground plane and a parasitic strip underneath the dielectric resonator (DR). By using an optimized truncated ground plane and a combination of stepped feed line with dielectric resonator, an ultra-wide impedance bandwidth of 153% for (S11 ? -10 dB), covering the frequency range of (3.7–28 GHz) is achieved. The added parasitic strip can improve the radiation pattern, especially at high frequencies. The proposed antenna covers almost the entire UWB (3.1–10.6 GHz), Ku (12.4–18 GHz) and K (18–26.6 GHz) frequency bands. Also, this antenna has an omnidirectional and stable radiation pattern over the whole operating frequency range and a compact size of (15×20×5.8 mm3 ) that make it suitable for wideband wireless system applications. This structure is light weight and can be easily fabricated. A prototype is built and measured. The simulated and measured results are in good agreement with the computed FDTD result. |
| Author(s): | S. H. Seyyedhatami, R. A. Sadeghzadeh |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 4 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1763 KB |
| Title: | Nonlinear Position-Flux Zero-Bias Control for AMB System with Disturbance |
| Abstract: | This study presents two novel nonlinear controllers for a single one-degree-of-freedom (1–DOF) active magnetic bearing (AMB) system operated in zero-bias mode with externally bounded disturbance. Recently developed controllers are complicated and inherently difficult to implement. The simple and low-order controllers proposed in this paper are designed using nonlinear feedback tools, including Lyapunov-based techniques and control Lyapunov functions (CLFs). The control objective is to globally stabilize the mass position of the nonlinear flux-controlled AMB system with control voltage saturation. The zero-bias AMB control model is derived from the voltage switching strategy. The developed CLF-based controllers are verified by numerical calculations. |
| Author(s): | A. Mystkowski, E. Pawluszewicz |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 8 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2026 KB |
| Title: | Nonlinear Neural Network Equalizer for Metro Optical Fiber Communication Systems |
| Abstract: | We present a neural network-based nonlinear electronic feed-forward equalizer. It compensates for the chromatic dispersion (CD) distortions in fiber optic communication systems with direct photo-detection. The proposed equalizer achieves bit error rate (BER) performance comparable to the maximum-likelihood sequence estimator (MLSE), with significantly lower computational cost. The complexity of the introduced equalizer scales linearly with the length of the intersymbol interference (ISI) as opposed to exponential growth the MLSE complexity. |
| Author(s): | M. M. T. Maghrabi, S. Kumar, M. H. Bakr |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 10 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1633 KB |
| Title: | Nonlinear Neural Network Equalizer for Metro Optical Fiber Communication Systems |
| File Type: | Conference Paper |
| Issue: | Volume: S33 Electromagnetic Simulation for RF and Microwave Design Optimization Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 296 KB |
| Title: | Non-uniform Feeding Network for a Dual Circularly Polarized 16×16 Ku-Band Antenna Array for On-Move Satellite Communication |
| Abstract: | This paper presents analysis and design of a dual circularly polarized 16×16 Ku band antenna array with emphasis on its feeding network. The proposed antenna is designed for on-move satellite communication system where the radiation pattern and the side-lobe level should meet the ITU standards to avoid interference with other satellite systems. This requirement is obtained by using non-uniform feeding distribution network. In addition, dual circular polarization operation requires sequential feeding networks with appropriate phase shift sequences. The proposed antenna is divided into 16 sub-cells of 4×4 radiating elements. The elements inside the sub-cell are fed by uniform dual sequential feeding networks. These sub-cells are connected together via two non-uniform feeding networks on a single layer in the shape of two interlaced fork configurations. In addition, cascaded power dividers are used to achieve the required low power division ratios between some of the sub-cells according to the required feeding distribution. These modifications simplify the fabrication process of the proposed antenna structure and reduce the required layers while satisfying the required radiation parameters. |
| Author(s): | W. M. Hassan, K. M. Ibrahim, E. A. Abdallah, A. M. Attiya |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1790 KB |
| Title: | New FDTD Model for Excitation of Microstrip Lines |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Time Domain Techniques Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 465 KB |
| Title: | NEW DESIGNS FOR DUAL BAND ANTENNAS FOR SATELLITE MOBILE COMMUNICATIONS HANDSETS |
| Abstract: | The design of dual-band antennas for hand-held terminals (HHT) to be used in personal communications via a satellite network (SPCN) is investigated. The quadrifilar helical (QHA) is selected as the optimum design for futher study and new design for a QHA is derived and optimized using a standard Moment-Method program. A dual L-S band design with an input VSWR in its two operating bands of between 1 and 2 was developed, incorporating external shorted turns to achieve the desired passbands. The design of the required hybrid feed phasing network is derived. Experiments with physical realizations of the optimum designs showed good performance and confirmed the computational predictions |
| Author(s): | S. M. Dannish, R. A. Abd-Alhameed, P. S. Excell, S. M. Dannish, R. A. Abd-Alhameed, P. S. Excell |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 3 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 1680 KB |
| Title: | Neural-Network-Based Multiobjective Optimizer for Dual-Band Circularly Polarized Antenna |
| Abstract: | A multiobjective optimization (MOO) technique for a dual-band circularly polarized antenna by using neural networks (NNs) is introduced in this paper. In particular, the optimum antenna dimensions are computed by modeling the problem as a multilayer feedforward neural network (FFNN), which is two-stage trained with I/O pairs. The FFNN is chosen because of its characteristic of accurate approximation and good generalization. The data for FFNN training is obtained by using HFSS EM simulator by varying different geometrical parameters of the antenna. A two strip-loaded circular aperture antenna is utilized to demonstrate the optimization technique. The target dual bands are 835– 865 MHz and 2.3–2.35 GHz. |
| Author(s): | T. Sallam, A. M. Attiya, N. A. El-Latif |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 3 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1386 KB |
| Title: | Near-Field Focused Folded Transmitarray Antenna for Medical Applications |
| Abstract: | A near-field focused folded transmitarray antenna is proposed at 2.45 GHz for medical applications. The proposed folded transmitarray construction introduces compact design, low profile, and reduced fabrication cost with focused power in both the near-field and far-field regions of the antenna. The transmitarray consists of a feeding horn antenna embedded centrally in the transmitarray structure and a perfect electric conductor plate with the same size as a reflector. The radiation from the feeding horn is reflected by the plate toward the transmitarray. The unit-cell element of the transmitarray is a square dielectric box with four identical circular holes. The transmission coefficient was nearly -3 dB in magnitude and 320 degrees in phase. The radiation characteristics of the unfolded and folded transmitarray are analyzed using the finite integral technique. The normalized power density distribution around a part of the human leg placed in front of the transmitarray is investigated. The proposed antenna is used to heat a specific area on the human leg for treatment. |
| Author(s): | S. H. Zainud-Deen, W. M. Hassan, H. A. Malhat |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 3 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 980 KB |
| Title: | Nanoarray of Vivaldi Rectenna for Infrared-energy Harvesting |
| Abstract: | This article presents the design of an array of rectennas operating at 28.3 THz for infrared (IR) energy harvesting applications. The basic element of the array consists of a Vivaldi-dipole rectenna composed of two arms made with different conductors (gold and titanium). A metal-insulator-metal (MIM) tunnel diode is used to rectify the THz ac current. The proposed MIM diode consists of a very thin layer of Al2O3 sandwiched between the two metal electrodes. Arrays of two, three, and four rectennas are investigated. The improvement of the energy captured by coupling several elements in the same structure with a common gap is also investigated. This array architecture, without feeding network, may reduce the number of rectifying diodes and, therefore, decrease losses and increase the overall efficiency. Finally, it has been found that the four-elements rectenna array has a maximum electric field intensity of 62.4 × 104 V/m at 28.3 THz. |
| Author(s): | W. Amara, A. Alzahrani, A. Mersani, D. Oueslati, A. Elsharabasy, B. Hakim, H. Rmili, A. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1670 KB |
| Title: | N-Shaped Frequency Reconfigurable Antenna with Auto Switching Unit |
| Abstract: | These days the need for reconfigurable antenna is widely increased in the field of multi band wireless communication. The proposed new design of N-shaped antenna structure consists of two PIN diodes for switching purpose. They are switched automatically by a pre-programmed Arduino microcontroller unit to attain the reconfiguration of four-different bands without changing the physical dimension of the antenna. The four switching bands are 3.5 GHz (WiMAX), 2.46 GHz (WLAN), 1.2 GHz (GPS) and 2.1 GHz (UMTS). It has a center stub with two N-shaped stub carrying PIN diodes. The stubs are connected with a 50ohm microstrip feed line. The measured return loss closely follows the simulation results. Also it exhibits a good impedance matching during the four switching states. The simulation has been done through Ansoft HFSS and measured results are obtained from a Vector Network Analyzer (VNA). The obtained VSWR value lies beneath 2 for all obtained bands. The radiation pattern of the antenna is bidirectional for all the four-switching states. |
| Author(s): | A. Vijayan, L. R. KarlMarx, K. J. Jegadish Kumar , C. C. Vimlitha |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 6 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1796 KB |
| Title: | N-Shaped Frequency Reconfigurable Antenna with Auto Switching Unit |
| Abstract: | These days the need for reconfigurable antenna is widely increased in the field of multi band wireless communication. The proposed new design of N-shaped antenna structure consists of two PIN diodes for switching purpose. They are switched automatically by a pre-programmed Arduino microcontroller unit to attain the reconfiguration of four-different bands without changing the physical dimension of the antenna. The four switching bands are 3.5 GHz (WiMAX), 2.46 GHz (WLAN), 1.2 GHz (GPS) and 2.1 GHz (UMTS). It has a center stub with two N-shaped stub carrying PIN diodes. The stubs are connected with a 50ohm microstrip feed line. The measured return loss closely follows the simulation results. Also it exhibits a good impedance matching during the four switching states. The simulation has been done through Ansoft HFSS and measured results are obtained from a Vector Network Analyzer (VNA). The obtained VSWR value lies beneath 2 for all obtained bands. The radiation pattern of the antenna is bidirectional for all the four-switching states. |
| Author(s): | A. Vijayan, L. R. KarlMarx, K. J. Jegadish Kumar , C. C. Vimlitha |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 6 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1798 KB |
| Title: | Mutual Coupling Reduction of a Very Compact UWB-MIMO Linearly Tapered Slot Antenna Using a Simple Stepped Slot |
| File Type: | Conference Paper |
| Issue: | Volume: 1-P1-C Wideband and Multiband Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 290 KB |
| Title: | Multifunctional Active Frequency Selective Surface |
| File Type: | Conference Paper |
| Issue: | Volume: 4-3-C Properties, Modelling and Novel Concepts of Artificial Electromagnetic Structures II Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 395 KB |
| Title: | Multi-Resonance Monopole Antenna with Inverted Y-Shaped Slit and Conductor-Backed Plane |
| Abstract: | This manuscript introduces a new design of multi-resonance monopole antenna for Ultra-Wideband (UWB) applications. The proposed antenna consists of an ordinary square radiating patch and a modified ground plane with inverted Y-shaped slit and conductor-backed plane, which provides a wide usable fractional bandwidth of more than 135%. By cutting an inverted Y-shaped slit in the ground plane and also by embedding an Inverted Y-shaped conductorbacked plane in the feed gap distance, additional (third and fourth) resonances are excited and hence much wider impedance bandwidth can be produced; especially at the higher band. By obtaining these resonances, the usable lower frequency is decreased from 3.12 to 2.9 GHz, and also the usable upper frequency of the presented monopole antenna is extended from 10.3 to 14.85 GHz. The measured results show that the proposed antenna can achieve the Voltage Standing Wave Ratio (VSWR) requirement of less than 2.0 in frequency range from 2.83 to 14.87 GHz, which is suitable for UWB systems. |
| Author(s): | S. Ojaroudi, Y. Ojaroudi, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 9 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 738 KB |
| Title: | Multi-Frequency T-Slot Loaded Elliptical Patch Antenna for Wireless Applications |
| Abstract: | In this paper, a multi frequency microstrip antenna (MSA) for wireless applications is designed. The proposed MSA comprised of elliptical patch antenna with T-slot. This antenna is fed by coaxial probe. The designparameters are major and minor axis of elliptical patch,length and width of T-slot and feeding point of probe. Theproposed antenna can provide optimized multi frequencyby varying the above design parameters. FR-4 substratewith dielectric constant 4.4 is chosen. The multifrequencies are 1.57 GHz, 1.96 GHz and 3.4 GHz, whichcovers the applications such as GPS and 4G LTE.The simulation of the antenna is performed using theANSOFT HFSS and it is analyzed for S11 (dB) andradiation pattern. The prototype antenna is fabricated foroptimized dimensions and tested using vector networkanalyzer. Simulation and experimental results arecompared with each other. |
| Author(s): | S. Murugan, B. Rohini, P. Muthumari, M. P. Priya |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1758 KB |
| Title: | Multi-Frequency T-Slot Loaded Elliptical Patch Antenna for Wireless Applications |
| Abstract: | In this paper, a multi frequency microstrip antenna (MSA) for wireless applications is designed. The proposed MSA comprised of elliptical patch antenna with T-slot. This antenna is fed by coaxial probe. The design parameters are major and minor axis of elliptical patch, length and width of T-slot and feeding point of probe. The proposed antenna can provide optimized multi frequency by varying the above design parameters. FR-4 substrate with dielectric constant 4.4 is chosen. The multi frequencies are 1.57 GHz, 1.96 GHz and 3.4 GHz, which covers the applications such as GPS and 4G LTE. The simulation of the antenna is performed using the ANSOFT HFSS and it is analyzed for S11 (dB) and radiation pattern. The prototype antenna is fabricated for optimized dimensions and tested using vector network analyzer. Simulation and experimental results are compared with each other. |
| Author(s): | S. Murugan, B. Rohini, P. Muthumari, M. Padma Priya |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1861 KB |
| Title: | Multi-Frequency T-Slot Loaded Elliptical Patch Antenna for Wireless Applications |
| Abstract: | In this paper, a multi frequency microstrip antenna (MSA) for wireless applications is designed. The proposed MSA comprised of elliptical patch antenna with T-slot. This antenna is fed by coaxial probe. The design parameters are major and minor axis of elliptical patch, length and width of T-slot and feeding point of probe. The proposed antenna can provide optimized multi frequency by varying the above design parameters. FR-4 substrate with dielectric constant 4.4 is chosen. The multi frequencies are 1.57 GHz, 1.96 GHz and 3.4 GHz, which covers the applications such as GPS and 4G LTE. The simulation of the antenna is performed using the ANSOFT HFSS and it is analyzed for S11 (dB) and radiation pattern. The prototype antenna is fabricated for optimized dimensions and tested using vector network analyzer. Simulation and experimental results are compared with each other. |
| Author(s): | S. Murugan, B. Rohini, P. Muthumari, M. Padma Priya |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1861 KB |
| Title: | Modified Double-Ridged Antenna for 2-18 GHz |
| Abstract: | In this paper, the design and simulation of a modified double-ridged antenna for 2-18 GHz is presented. The designed antenna has a voltage standing wave ratio (VSWR) less than 2.4 for the frequency range of 2-18 GHz and is most suitable as a feed element in the reflectors of the radar systems and EMC applications. The proposed antenna had distortion in radiation patterns in the 10-14 GHz frequency range. This problem has been modified by shaping of ridges. The proposed antenna is simulated with commercially available packages such as CST microwave studio and Ansoft HFSS in the operating frequency range. Simulation results for the VSWR, radiation patterns, and gain of the designed antenna over the frequency band 2-18 GHz are presented and discussed. |
| Author(s): | A. R. Mallahzadeh, A. Imani |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 2 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 500 KB |
| Title: | MODELLING BY NEC OF AN HF LOG-PERIODIC ANTENNA |
| Abstract: | The Numerical Electromagnetics Code (NEC) is a computer code for analysing the electromagnetic response of an arbitrary structure consisting of wires and surfaces in free space or over a ground plane. It is based on the application of the Method of Moments to solve the electric field integral equation. A practical application of NEC which involved calculation of the impedance of a vertically polarised HF log- periodic antenna and comparison with measurements is described. A technique for improving the accuracy of the numerical calculations is discussed in addition to methods for accurately measuringmpedances of antennas employing balanced two-wire transmission line feeders. [Vol. 2, No. 2, pp. 103-111 (1987)] |
| Author(s): | G. R. Haack, G. R. Haack |
| File Type: | Journal Paper |
| Issue: | Volume: 2 Number: 2 Year: 1987 |
| Download Link: | Click here to download PDF File Size: 1080 KB |
| Title: | Modeling, Synthesis and Broadband Matching of a Panel Crossed- Dipole Antenna for FM Broadcasting Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Antenna Applications Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 534 KB |
| Title: | Modeling the Performance Impact of Cubic Macro Cells Used in Additively Manufactured Luneburg Lenses |
| Abstract: | Finite Element Analysis (FEA) is used to determine the sensitivity of feed placement on a Luneburg lens (LL) having large scale cubic discretization of its permittivity distribution. This is of practical importance for lenses fabricated using additive manufacturing, allowing accurate prediction of performance, and potentially reducing overall print time. It is shown that the farfield relative side lobe level (RSLL) is most sensitive to this form of discretization, and the impact to multi-feed and single-feed applications is considered. It is shown that for single-feed applications, large cubic macro cells are beneficial and provide a RSLL above that achieved with the continuous and non-uniform shelled counterparts. |
| Author(s): | B. F. LaRocca, M. S. Mirotznik |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 10 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1384 KB |
| Title: | Modeling of Medium Frequency Propagation Experiments at the NIOSH Safety Research Coal Mine |
| File Type: | Conference Paper |
| Issue: | Volume: EM Applications Using FEKO Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 891 KB |
| Title: | Modeling and Design of Dual- and Wide-band Multi-port Circularly Polarized Patch Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis IV Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 1050 KB |
| Title: | Modeling and Analysis of a Dual-Band Dual-Polarization Radiator Using FEKO |
| Abstract: | A dual-band hybrid antenna element comprising of microstrip and waveguide radiating elements is theoretically investigated through computer simulations. The low band radiator is a Shorted Annular Ring (SAR) microstrip antenna and the high band antenna is an open ended circular waveguide. First, the characteristics of a SAR patch antenna are presented and reviewed. Then the dual-band antenna configuration is described, which is realized by forming a waveguide radiator in the shorted region of the SAR microstrip antenna. Modeling and analysis of the SAR patch antenna and the hybrid element are investigated using the method-of-moment-based software package FEKO. The analysis includes return loss computations showing the element bandwidth at different frequency bands and the radiation patterns in the E- and H- planes. Feeding the element in phase quadrature produces circular polarizations (CP). The radiation patterns of the CP dual-band element are also analyzed using FEKO and the axial ratio performance is subsequently assessed |
| Author(s): | Amir I. Zaghloul, C. Babu Ravipati, M. T. Kawser, Amir I. Zaghloul, C. Babu Ravipati, M. T. Kawser |
| File Type: | Journal Paper |
| Issue: | Volume: 22 Number: 1 Year: 2007 |
| Download Link: | Click here to download PDF File Size: 617 KB |
| Title: | Modeling and Analysis of a Dual-Band Dual-Polarization Radiator Using FEKO |
| File Type: | Conference Paper |
| Issue: | Volume: FEKO Modeling and Analysis - 1 Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 200 KB |
| Title: | Miniaturized, Wideband Fractal Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: Integrated Antennas for Portable Devices Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 346 KB |
| Title: | Miniaturized Cross-Lines Rectangular Ring-Shaped Flexible Multiband Antenna |
| Abstract: | A compact, flexible antenna for wireless applications, i.e., WLAN/WiMAX/Wi-Fi, UMTS2100, C-Band, and DSRC is presented. The quad-band antenna is designed and analyzed in terms of efficiency, gain, radiation pattern, return loss, and VSWR. The optimized design consists of a CPW fed rectangular ring patch with the semi-circular ground. The cross-lines and the semicircular ground is investigated to ascertain the multiband effect. A concept of inset feed mechanism is also interpolated to enhance impedance matching. The framed antenna is examined under the bent condition as well. The reported work is an apt candidate for the proposed applications because of its high efficiency of 95% with a peak gain of 3.22 dBi along with VSWR less than 2. With stable radiation pattern and bandwidth, there is a justified concurrence between simulated and measured results. |
| Author(s): | A. Javed, A. Ejaz, S. Mehak, Y. Amin, J. Loo, H. Tenhunen |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1824 KB |
| Title: | Millimeter-wave Wideband High-isolation Antenna Array Based on End-fire Magnetoelectric Dipole Antenna for 5G Applications |
| Abstract: | In this paper, a millimeter-wave (mmW) wideband high-isolation wide-angle scanning antenna is presented. The end-fire magnetoelectric (ME) dipole with wideband impedance characteristic and wide beamwidth is selected. Based on the ME dipole, a 1×4 subarray with a stripline feed network is constructed to get higher antenna efficiency. Then, four 1×4 subarrays are adopted to form a 4×4 array to realize the wideangle scanning performance. Furthermore, to get better isolation between the subarrays, the beam is tilted on the non-scanning plane; in addition, the resonant split rings are added on the background of the subarrays.With these two measures, the isolation between the subarrays can be effectively reduced, with more than 20 dB over the entire bandwidth. Owing to the wide beamwidth of ME dipole and high isolation between the subarrays, the 44 array can obtain the wide-angle scanning characteristic. The final antenna covers an operating bandwidth of 19.5% (24.25-29.5 GHz) with return loss more than 10 dB, which can meet the band in the 5G standard. The beam can scan approximately ±55° with a realized gain reduction under 3 dB within the wide operating bandwidth. Also, the simulated radiation efficiency of the array is more than 77% over almost the entire band. The antenna will be a potential candidate to be applied in 5G applications. |
| Author(s): | F.-F. Fan, Q.-L. Chen, K. Qin |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 11 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 17191 KB |
| Title: | Microstrip Reflectarray for Generation of Electromagnetic Waves with Beam Vorticity |
| Abstract: | One type of orbital angular momentum (OAM) reflectarray antenna is presented to radiate the electromagnetic wave with beam vorticity. Microstrip double square loops are adopted as the element for the proposed reflectarray. Reflect phase of the elements with various sizes are analyzed by HFSS software with periodic boundary condition and Floquet mode. Then massive elements with different sizes are arranged helically to form the reflectarray, transforming the incident spherical wave into a vortex phase front. Several OAM reflectarray examples with different OAM mode and different feed mode are designed and fabricated. The phase patterns of far-zone field are simulated by FEKO software and measured by near-field scanning system, which demonstrates the phase singularity and vortex. |
| Author(s): | H.-T. Chen, R. Pan, W.-Z. Sun, S.-Y. He |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 5 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 2068 KB |
| Title: | Microstrip Line Fed E-Patch Antenna for WLAN Applications |
| File Type: | Conference Paper |
| Issue: | Volume: S38 Antenna Applications II Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 276 KB |
| Title: | Microstrip Antenna Array with Beamforming Network for WLAN Applications |
| File Type: | Conference Paper |
| Issue: | Volume: Analysis and Design of Antennas for Wireless Communications Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 246 KB |
| Title: | Microstrip Antenna Array Optimization Using Surrogate-Based Methodology |
| File Type: | Conference Paper |
| Issue: | Volume: EM – Simulation – Driven Design: Modeling and Optimization Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 1068 KB |
| Title: | Low-cost Two-layer Terahertz Transmitarray |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-B Millimeter Wave and Terahertz Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 264 KB |
| Title: | Low SAR Phased Antenna Array for Mobile Handsets |
| Abstract: | Abstract—A two-element phased antenna array for a mobile handset is investigated using the Finite Difference Time Domain (FDTD) method. The array is designed to provide a spatial minimum in SAR in the near field zone inside the human head. The optimisation algorithms to obtain the minimum peak specific absorption rate (SAR) and minimum total absorbed power are addressed. It is found that these criteria are not seriously conflicting. The effects of the head-array spacing on the optimum array feeding voltages and the reduction in SAR are discussed. The results are compared with those from a normal single element handset, showing that the overall efficiency and azimuth coverage are improved and that peak specific absorption rate in the head can be reduced by at least 8 dB. |
| Author(s): | J. Moustafa, N. J. McEwan, R. A. Abd-Alhameed, P. S. Excell, J. Moustafa, N. J. McEwan, R. A. Abd-Alhameed, P. S. Excell |
| File Type: | Journal Paper |
| Issue: | Volume: 21 Number: 3 Year: 2006 |
| Download Link: | Click here to download PDF File Size: 724 KB |
| Title: | Low Profile Dual-polarized Circular Patch Antenna with HIS Reflector for TT&C System |
| File Type: | Conference Paper |
| Issue: | Volume: 4-2-B Space and Satellite Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 732 KB |
| Title: | LCEC Beamforming Applied to a Time-modulated Array |
| File Type: | Conference Paper |
| Issue: | Volume: 2-3-B Modeling, Design and Optimization of Modern Antennas Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 494 KB |
| Title: | Lanczos-Based Model-Order Reduction for Optimization and Control of Electromagnetically Induced Hyperthermia |
| Abstract: | In this work, two procedures for the optimization of transient temperature fields in electromagnetically induced therapeutic hyperthermia are proposed. Both procedures employ numerical models of electromagnetic and heat transfer processes. The computational demands of the optimization procedures are mitigated by employing reduced-order numerical models obtained via the spectral Lanczos decomposition method (SLDM) in lieu of the original, high-order models. An open-loop optimization procedure based on quadratic programming (QP) is proposed that determines the time dependent RF power level necessary to reach therapeutic temperatures quickly without exposing healthy tissue to excesive temperatures. Additionally, a closed-loop optimization procedure is proposed based on linear-quadratic Gaussian (LQG) optimal control that employs feedback from temperature measurements such as those available from magnetic resonance thermography. The performance of both techniques is simulated on a realistic tissue model of the human trunk heated by an annular phased array (APA). It is shown that by optimizing the transient temperature fields in oncological hyperthermia, effective thermal dose can be increased for a fixed treatment time and level of risk to healthy tissue. Additionally, it is shown that in some cases the non-linear nature of the human thermoregulatory response (manifest as temperature dependent perfusion) can be compensated for by the proposed linear feedback controller. |
| Author(s): | Marc E. Kowalski, Jian-Ming Jin, Marc E. Kowalski, Jian-Ming Jin |
| File Type: | Journal Paper |
| Issue: | Volume: 16 Number: 2 Year: 2001 |
| Download Link: | Click here to download PDF File Size: 1373 KB |
| Title: | L, U, T and F-Shaped Slots in Patch Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S10 EM Simulations using Sonnet I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 161 KB |
| Title: | Ku-Band Phase-Gradient Metasurface for Broadband High-Gain Circularly Polarized Lens Antenna |
| Abstract: | In this paper, a novel broadband high-gain, circularly polarized planar lens antenna is presented. We used the rotation elements to design a transmission-type polarization conversion planar phase-gradient metasurface (PPGM). By adjusting the rotational angles of the metal patch on the element, we obtained the desired transmission phase shift for PPGM. We used a patch antenna as a feed source, which formed a lens antenna system integrated with the PPGM. The simulation results showed that the PPGM can achieve a high-efficiency, cross-polarization conversion for vertical incidence of a right-handed circularly polarized plane wave. Our numerical and experimental results agreed well with each other, indicating that the antenna system had a peak gain of 18.8 dB, a good axial ratio better than 2 dB at 13 GHz, with an aperture efficiency of 50.56% and a focal length/diameter (F/D) ratio of 0.307. In addition, its -10 dB impedance and 3dB axial ratio bandwidth reached up to 940 MHz. The lens antenna performed well and can be applied in many communication systems. |
| Author(s): | J. Su, Z. Li, Z. Li, Q. Guo, Y. L. Yang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 5 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1769 KB |
| Title: | Ku-Band Dual Linear Polarized Parabolic-Cylindrical Reflector Antenna with Beam Steering Performance |
| File Type: | Conference Paper |
| Issue: | Volume: S06 Antennas and Sensors Applications Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 1232 KB |
| Title: | Invited Paper - Hybrid Simulation of Electrically Large Millimeter-Wave Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Special Session: Electromagnetic Modeling by FEKO Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 286 KB |
| Title: | Investigations on a Novel without Balun Modified Archimedean Spiral Antenna with Circularly Polarized Radiation Patterns |
| Abstract: | The proposed novel modified twolayered Archimedean spiral (Mod Arspl) antenna achieves a simple feed without balun and maintains the antenna input impedance close to 50 ? over extremely wide (10:1) frequency band for antenna design. It shows excellent impedance matching, higher peak gain and acceptable axial ratio over the operating frequencies compared to the conventional Archimedean spiral geometry on two-layers with the same aperture area. The working of this antenna and important design parameters to achieve frequency independent response with respect to matching and CP radiation patterns are discussed. The best case with free-space Mod Arspl has impedance BW (S11 < - 10 dB) of 3.2-19.2 GHz (6:1 band), AR BW (AR < 3dB) of 3-20 GHz (6.6:1 band), stable broadside gain of 4-5.5 dBic and quasi-axial patterns in the usable 6:1 band. Radiation patterns show some beam squint towards higher frequency end attributed to spacing between the two layers of the spiral arms. The fabricated prototype antenna using microwave substrate shows CP operating BW over 5.21:1 frequency band (2.8 - 14.6 GHz) and peak gain varying between 4 - 8 dBic in this frequency band. Measured results show reasonable agreement with the simulated ones. |
| Author(s): | B. Shanmugam, S. K. Sharma |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 8 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 2320 KB |
| Title: | Investigation of Feed Gaps of Ultra Wideband Microstrip Dipole Antennas and FDTD Simulation |
| File Type: | Conference Paper |
| Issue: | Volume: FDTD and Applications Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 187 KB |
| Title: | Investigation of a Proposed ANN-Based Array Antenna Diagnosis Technique on a Planar Microstrip Array Antenna |
| Abstract: | In this article, a realistic neural network based method is proposed for the array antenna fault diagnosis through the utilization of array far field characteristics. Defective elements are those elements that are not excited directly by the feed lines but radiations due to the induced currents on the surface of these elements still remain. Neural network performs a nonlinear mapping between some samples of the degraded patterns and the array elements which may have caused these degradations. The proposed method is investigated on a real fabricated micro-strip planar array via its far field degraded radiation pattern measurements. A multilayer perceptron neural network trained in the back propagation mode with some samples of the simulated degraded patterns is used in an innovative manner to map the measured radiation pattern to its corresponding faulty elements configuration. After the training procedure the proposed fault diagnosis system is very fast and has a satisfactory success rate both in theory and application that makes it suitable for real time applications. |
| Author(s): | A. R. Mallahzadeh, M. Taherzadeh |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 8 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 756 KB |
| Title: | Integral Operators Formulation for Transient Radiation from Parabolic Antennas Using Modified Raised Cosine Feeder |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Integration Equation Techniques & Applications Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 288 KB |
| Title: | Informed Deep Learning in Metamaterials |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Reconfigurable Metamaterials and Antennas Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 227 KB |
| Title: | Influences of Amplitude Tapering and Feed Blockage on the Radiation Characteristics of Ku-Band Parabolic Reflector Antennas |
| Abstract: | In this work, the influences of amplitude tapering and feed aperture blocking in gain and first sidelobe level of Ku-band parabolic reflector antennas are investigated. Two different parabolic antenna configuration groups are proposed to determine each of these degradation factors. Designed parabolic reflectors are fed by pyramidal and conic horns to observe the blockage effect of feed type on Ku-band satellite reception applications. In the first examination to designate the influence of illumination loss due to amplitude tapering four parabolic reflectors are designed with 8 dB, 10 dB, 15 dB and 20 dB edge taper values on reflector apertures. Thereafter, thanks to the reflectors designed with the same edge taper value, but having different diameters, it became possible to observe, purely the influence of feed blockage on the radiation characteristics. Both theoretical and simulated patterns of reflector systems are presented. |
| Author(s): | N. T. Sonmez, F. Tokan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 3 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2066 KB |
| Title: | Influence of Astigmatism in Reflector Feeds |
| File Type: | Conference Paper |
| Issue: | Volume: S14 Antennas and Arrays II Number: Year: 2016 |
| Download Link: | Login To Download (For Members) File Size: 384 KB |
| Title: | Improving the Performance of Loop Antenna by Using a Dual Feeding System |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Antenna Design and Applications Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 138 KB |
| Title: | Important Equations for Designing Very Small Normal-Mode Helical Antennas |
| File Type: | Conference Paper |
| Issue: | Volume: Advances and Challenges in Computational Electromagnetic Modeling of RFID Systems Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 999 KB |
| Title: | Impact of Some Discontinuities on the Convergence of Numerical Methods in Electromagnetics |
| Abstract: | The effect of discontinuities at edges and at feed-points of antennas on numerical convergence rates is investigated. In the case of edges, higher order representations of the edge-mode, expressed with the aid of Hermite splines, are shown to provide improved convergence in both global and local measures. When using a magnetic frill to excite an antenna, it is shown that when the current representation allows for the "charge jump" across the frill, then convergence is accelerated. The use of both sub-domain and entire-domain functions is explored. |
| Author(s): | M. M. Bibby, M. M. Bibby |
| File Type: | Journal Paper |
| Issue: | Volume: 18 Number: 3 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 176 KB |
| Title: | High-Q Active Microwave Sensor Based on Microstrip Complementary Split-Ring Resonator (MCSRR) Structure for Dielectric Characterization |
| Abstract: | This paper presents an active microwave sensor for the characterization of dielectric materials. The sensor is consisted of a microstrip complementary split-ring resonator (MCSRR) structure and an active feedback loop. The loop uses an amplifier to generate negative resistance to compensate the resonator’s loss and increase the loaded quality factor. The developed sensor possesses the advantages of high quality factor, ultra-small electrical size, and high sensitivity. A prototype of the sensor is fabricated and measured for validation. |
| Author(s): | H.-Y. Gan, W.-S. Zhao, D.-W. Wang, J. Wang, Q. Liu, G. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 7 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1532 KB |
| Title: | Ultrafast ray tracing for electromagnetics via kD-tree and BVH on GPU |
| File Type: | Conference Paper |
| Issue: | Volume: S14 Hardware and Software Acceleration Techniques Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 272 KB |
| Title: | Ultra-wideband Miniaturized Electromagnetic Bandgap Structures Embedded in Printed Circuit Boards: Theory, Modeling and Experimental Validation |
| File Type: | Conference Paper |
| Issue: | Volume: Design and Analysis of Advanced Circuit Architectures Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 813 KB |
| Title: | Ultra-wideband Metasurface for Radar Cross Section Reduction |
| File Type: | Conference Paper |
| Issue: | Volume: 3-2-E Radar Cross Section Reduction Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 312 KB |
| Title: | Ultra-Wideband Balanced Bandpass Filters Based on Transversal Signal- Interference Concepts |
| Abstract: | Two ultra-wideband balanced bandpass filters based on transversal signal-interference concepts are proposed in this paper. By employing the two structures: microstrip/slotline transition, and quarter-wavelength shorted coupler lines, 180° phase shift can be easily implemented for each design. In addition, due to the different transmission paths, wideband common mode rejection and differential mode transmission bandwidth can be achieved. Two balanced filters centered at 3 GHz are calculated, fabricated and measured successfully. For the differential mode, the 3-dB fractional bandwidths are 102% from 1.47 GHz to 4.53 GHz and 103% from 1.52 GHz to 4.61 GHz, respectively, and the return loss are both greater than 20 dB. For the common mode, signals are suppressed below -20 dB and -15 dB over the whole frequency band. |
| Author(s): | C. Zhao, W. Feng, Y. Li, W. Che |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 10 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1803 KB |
| Title: | Ultra Wideband Microwave Ten-Port Reflectometer |
| Abstract: | This paper describes and simulates the Ultra Wideband (UWB) Ten-Port Reflectometer (TPR). It is based on the concept of well-known sixport structure so that numbers of measuring ports are increased to eight in order to improve reliability and accuracy as well. This article presents UWB (2 GHz to 12 GHz) reflectometer using Rectangular Waveguide (RWG). It is proved that increasing numbers of measuring ports leads to improving accuracy and reliability of structure so that each port with corresponding port help to make wideband reflectometer as well as having reliable and robust structure. This prototype of ten-port reflectometer is simulated by Agilent ADS and using RWG that has more bandwidth, less loss and high Q-factor than other common transmission lines, say microstrip, SIW and CPW. |
| Author(s): | A. Askarian, G. Moradi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 1 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 468 KB |
| Title: | Ultra Wide Band-stop MEFSS with Metamaterial Characteristic |
| File Type: | Conference Paper |
| Issue: | Volume: 4-P4-G Metamaterials/Metasureface/Periodic Structures Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 212 KB |
| Title: | UHF-Band Bandpass Filters With Fully- Reconfigurable Transfer Function |
| File Type: | Conference Paper |
| Issue: | Volume: S54 Tunable RF Filters Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 804 KB |
| Title: | Two-Dimensional Electrical Properties Tomography Using a Simplified Contrast-Source Inversion Approach |
| File Type: | Conference Paper |
| Issue: | Volume: S08 Student Paper Competition I Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 1334 KB |
| Title: | Two-Dimensional Electrical Properties Tomography Using a Simplified Contrast-Source Inversion Approach |
| File Type: | Conference Paper |
| Issue: | Volume: S30 Optimization and Inverse Problems in Low Frequency EM Applications I Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 1337 KB |
| Title: | Tuning of Waveguide Bandstop Filter Properties by Changing the Physical Dimensions of Metamaterial Unit Cell |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling of Metamaterials and Transformation Based Devices Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 605 KB |
| Title: | Tunable Electromagnetic Response of Free-Standing 3D Carbon Nanotube Network in the Ka-band |
| File Type: | Conference Paper |
| Issue: | Volume: S35 Nanoelectronics and Nanoelectromagnetics Modeling and Applications Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 274 KB |
| Title: | Tunable Absorption Based on Plasmonic Nanostructures Loaded with Graphene |
| File Type: | Conference Paper |
| Issue: | Volume: S08 Nano-Electromagnetics Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 190 KB |
| Title: | Triple Band Bandpass Filter Design and Implementation Using SIRs |
| File Type: | Conference Paper |
| Issue: | Volume: EM Simulations Using Sonnet - II Number: Year: 2010 |
| Download Link: | Login To Download (For Members) File Size: 196 KB |
| Title: | Triangular Grids: A Review of Resonator and Waveguide Analysis with Classical FIT and Some Reflections on Yee-like FIT- and FEM-Schemes |
| Abstract: | Abstract—The focus of this paper is on the solution of Maxwell's equations on triangular orthogonal grids for timeharmonic elds in cylindrically symmetric resonators and general time dependant elds in length-homogeneous waveguides, respectively. The method is based on the Finite Integration Technique (FIT) [1], [2]. The 2D simulation on a structured triangular grid combines the advantages of FIT, as e.g. the consistency of the method or the numerical advantage of banded system matrices, with the geometrical exibility of noncoordinate grids. FIT on triangular grids was rst introduced in [3], [4]1. This paper presents a review describing the underlying theory in FIT operator notation rst introduced in [2] and puts this classical approach for FIT on triangular grids in relation to actual research in the eld. |
| Author(s): | URSULA VAN RIENEN, URSULA VAN RIENEN |
| File Type: | Journal Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 973 KB |
| Title: | Traveling Wave Effects in Microwave Quantum Photonics |
| File Type: | Conference Paper |
| Issue: | Volume: S22 Microwave Quantum Information Technology - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 213 KB |
| Title: | Transmission Line Matrix Model for Microwave Scanning Microscopy |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Nondestructive Testing Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 294 KB |
| Title: | Transmission Improvement of Windshield with Periodic Structure at 5G Frequency Band |
| File Type: | Conference Paper |
| Issue: | Volume: S05 EM Modeling Using Feko - I Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 294 KB |
| Title: | Transmission Bandgap of a Two-dimensional Coaxial Bragg Structure with Hybrid Filling Media |
| File Type: | Conference Paper |
| Issue: | Volume: 2-2-C Novel Electromagnetic Metamaterials and Their Applications Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 315 KB |
| Title: | Transistor-Loaded Nonmagnetic Nonreciprocal Metasurfaces |
| File Type: | Conference Paper |
| Issue: | Volume: S26 Complex Meta-Structures and Applications - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1247 KB |
| Title: | Transient Electromagnetic Scattering from Dielectric Objects Using Time-Domain Integral Equation |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Techniques Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 197 KB |
| Title: | Transient Effect of 3D RF-MEMS Structures with Moving Plate |
| File Type: | Conference Paper |
| Issue: | Volume: Advanced Modeling Techniques and The Application of Microwave Devices Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 267 KB |
| Title: | Transient Analysis of Dispersion Medium with Conducting Strips buried in Different Depth |
| File Type: | Conference Paper |
| Issue: | Volume: S46 Time-Domain Techniques for Designing Electromagnetic and Optical Devices - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 208 KB |
| Title: | Towards the Synthesis of Plasmonic Nanostructures by Means of Stochastic Optimization |
| File Type: | Conference Paper |
| Issue: | Volume: Microwave Imaging and Inverse Problems Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 112 KB |
| Title: | Topology-optimized Nanostructures for High-NA Lensing Optics |
| File Type: | Conference Paper |
| Issue: | Volume: S24 Design and Optimization for Nanophotonics: Multiscale Techniques Number: Year: 2020 |
| Download Link: | Login To Download (For Members) File Size: 858 KB |
| Title: | Time-Domain Orthogonal Finite-Element Reduction-Recovery (OrFE-RR) Method for Electromagnetics-Based Simulation of VLSI Problems |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Electromagnetic Methods of Significantly Reduced Complexity for High-Speed IC Design Number: Year: 2009 |
| Download Link: | Login To Download (For Members) File Size: 230 KB |
| Title: | Time-Domain Neural Network Modeling Approaches for Embedded Passives in Multilayer Printed Circuits |
| File Type: | Conference Paper |
| Issue: | Volume: Recent Advances in Time Domain Modeling Techniques Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 218 KB |
| Title: | Time of Flight Extraction of Dispersive Lamb Wave by Ridge Analysis |
| File Type: | Conference Paper |
| Issue: | Volume: 5-P-1 Poster Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 263 KB |
| Title: | Time Domain Models of Negative Refractive Index Metamaterials |
| File Type: | Conference Paper |
| Issue: | Volume: Metamaterials Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 225 KB |
| Title: | Time Domain Modelling of Microwave Interaction with Nano- Structure |
| File Type: | Conference Paper |
| Issue: | Volume: Student Paper Competition Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 370 KB |
| Title: | Time Domain Modeling of All-Optical Switch based on PT-Symmetric Bragg Grating |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling and Simulation in Electromagnetic Engineering Number: Year: 2013 |
| Download Link: | Login To Download (For Members) File Size: 978 KB |
| Title: | Three-Dimensional Geometrical Optics Code for Indoor Propagation |
| Abstract: | This paper presents program GO_3D for computing the fields of a transmitter in an indoor environment using geometrical optics. The program uses an “image tree” data structure to construct the images needed to compute all the rays carrying fields above a preset “threshold” value, no matter how many reflections are needed. The paper briefly describes the input file required to define wall construction, the floor plan, the transmitter, and the receiver locations. A case study consisting of a long corridor with a small room on one side is used to demonstrate the features of the GO_3D program. |
| Author(s): | C.W. Trueman, C.W. Trueman |
| File Type: | Journal Paper |
| Issue: | Volume: 17 Number: 2 Year: 2002 |
| Download Link: | Click here to download PDF File Size: 733 KB |
| Title: | Three-bit Unit-cell with Low Profile for X-Band Linearly Polarized Transmitarrays |
| Abstract: | In this paper, we present a three-bit phase resolution and low profile unit-cell structure for X-band passive transmitarrays. The unit-cell is implemented using four metallic layers printed on two substrates separated by an air gap. The phase shift is achieved by a combination between current flow modification on middle layers and the variation of the size of path elements. Eight unit-cells are optimized to provide eight phase states with a step of 45°. Experimental results are conducted by using WR-90 waveguide to validate the design. These eight unit-cells cover a wide -3 dB transmission bandwidth of 15% and exhibit a low thickness of 0.18λ0. |
| Author(s): | B. D. Nguyen, M. T. Nguyen |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 9 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1891 KB |
| Title: | Three New Rat-Race Couplers with Defected Microstrip and Ground Structure (DMGS) |
| Abstract: | In this paper, three new types of ratrace ring couplers with defected microstrip and ground structure (DMGS) are presented and one type is fabricated to validate the simulation results. The proposed structures have the advantages of size reduction as well as 3rd harmonic suppression. Embedding the DMGS section increases the slowwave factor (SWF) and as a result the resonant frequency of the coupler decreases, which sets the stage for size reduction. In addition, insertion losses of the 3rd harmonic of the proposed couplers are reduced to 35 dB. After optimizing with genetic algorithm (GA), one type is fabricated. Good agreement between the simulation and measurement results is observed. Simulations are carried out using HFSS 13 and the designed coupler is validated by measurement. |
| Author(s): | Ma. Shirazi, R. Sarraf Shirazi, Gh. Moradi, Mo. Shirazi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 4 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 888 KB |
| Title: | Thin Wire Representation of the Vertical Conductor in Surge Simulation |
| Abstract: | Abstract— Simulation of very fast surge phenomena in a three-dimensional (3-D) structure requires a method based on Maxwell’s equations, such as the FDTD (finite difference time domain) method or the MoM (method of moments), because circuit-equation-based methods cannot handle the phenomena. This paper describes a method of thin wire representation of the vertical conductor system for the FDTD method which is suitable for the 3-D surge simulation. The thin wire representation is indispensable to simulate electromagnetic surges on wires or steel frames of which the radius is smaller than a discretized space step used in the FDTD simulation. A general surge analysis program named VSTL (Virtual Surge Test Lab.) based on the Maxwell equations formulated by the FDTD method is used to simulate the surge phenomena of a vertical conductor, including the effects of ground plane and without ground plane. By use of the Maxwell equations, VSTL is inherently able to take into account the three-dimensional geometrical features of a simulated structure unlike EMTP-type circuit-based transient programs. Comparisons between calculated results by the FDTD method, theoretical results and computed results by the NEC-2 (Numerical Electromagnetic Code) based on the MoM are presented to show the accuracy of the thin wire representation. |
| Author(s): | Md. Osman Goni, Eiji Kaneko, Hideomi Takahashi, Md. Osman Goni, Eiji Kaneko, Hideomi Takahashi |
| File Type: | Journal Paper |
| Issue: | Volume: 19 Number: 1 Year: 2004 |
| Download Link: | Click here to download PDF File Size: 322 KB |
| Title: | Thermal Analysis and Phase Transformation of Ti6Al4V Alloy Fabricated by Direct Metal Laser Sintering |
| File Type: | Conference Paper |
| Issue: | Volume: S36 Large Scale Computing - I Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 373 KB |
| Title: | Theoretical Model for Diffuse Optical Wave Scattering from a Three-Dimensional Slab Bounded by Randomly Rough Surfaces |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Electromagnetics for Photonics Number: Year: 2007 |
| Download Link: | Login To Download (For Members) File Size: 174 KB |
| Title: | The Way from Natural to Artificial |
| File Type: | Conference Paper |
| Issue: | Volume: 2-1-C Properties, Modelling and Novel Concepts of Artificial Electromagnetic Structures I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 235 KB |
| Title: | The Validationof EM Modelling Codes. A User Viewpoint |
| Abstract: | Computer codes for solving radiation and scattering problems have becomed powerful and widely available. The user of such a code must initially convince himself that his copy of the code executes correctly on his specific computer with his particular compiler. He must then build up expertise in constructing models for solution by the code which obey the restrictions imposed by the "modelling guildelines" accompanying the code in a user's manual. Users often want to solve "real" problems that do not conform to the problem geometry envisaged by the code writer. The user replaces the "real" structure with a computer model solvable by the code, and which obeys the modelling guidelines. The user must then carry out a "model validation" in which the computer model is tested against full-scale or scale model measurements. A successful "model validation" contributes to the user community's "experience base" and lends confidence to both the computer code and to the modelling process. Sometimes an unsuccessful attempt at modeling exposes a genuine limitation of the code. Then a new "modelling guideline" can be formulated to aid other users in avoiding the same difficulties. This paper reviews code development to highlight the origin of "modelling guidelines", and how they are extended by the user community. From the user's point of view, the "experience base" is augmented whenever a successful "model validation" is carried out and reported. Several examples are presented of the difficulties that may be encountered in computer modelling, and how such difficulties lead to further "modelling guidelines" aimed at aiding others in solving similar problems. |
| Author(s): | S.J. Kubina, C.W. Trueman, S.J. Kubina, C.W. Trueman |
| File Type: | Journal Paper |
| Issue: | Volume: 4 Number: 3 Year: 1989 |
| Download Link: | Click here to download PDF File Size: 731 KB |
| Title: | The Use of FEKO in Providing High Fidelity Radar Simulation |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Simulation using FEKO Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 65 KB |
| Title: | The Time-Bandwidth Limit in Optical Nanostructures and Its Relation to Nonreciprocity |
| File Type: | Conference Paper |
| Issue: | Volume: S08 Design, Analysis and Applications of EM Metasurfaces I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 105 KB |
| Title: | The Temperature Compensation for TE011 Mode Resonator with Bimetal Material |
| Abstract: | This paper proposes a temperature compensation design for TE011 mode resonator based on multiphysics analysis. The relationship between structure and electrical performance of circular waveguide resonator is specifically analyzed. Furthermore, a novel temperature compensation structure with bimetal material is proposed by using multiphysics analysis. The proposed TE011 mode resonator is fabricated and tested to verify the design method. The temperature drift coefficient of the compensated TE011 mode resonator can be dramatically reduced from 21.387 ppm/°C to 0.93ppm/°C. |
| Author(s): | Q. Wu, J. Zhang, Y. Yang, X. Shi |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 7 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1505 KB |
| Title: | The Success of GPU Computing in Applied Electromagnetics |
| Abstract: | In the field of electromagnetic modeling, whether it is the complex designs for engineered materials or devices and components integrated within their natural environments, there is a big drive for highly efficient numerical techniques to model the performance of complex structures. This often cannot be achieved by conventional computer systems, but rather through using the so-called high performance computing (HPC) systems that utilize hardware acceleration. We review recent General Purpose Graphics Processing Units (GPGPU) computing strategies introduced in four fields of computational electromagnetics: Finite-Difference Time-Domain (FDTD), Finite Elements Method (FEM), Method of Moments (MoM) and ElectroMagnetic Ray Tracing (EMRT). |
| Author(s): | A. Capozzoli, O. Kilic, C. Curcio, A. Liseno |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 4 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1478 KB |
| Title: | The Success of GPU Computing in Applied Electromagnetics |
| Abstract: | In the field of electromagnetic modeling, whether it is the complex designs for engineered materials or devices and components integrated within their natural environments, there is a big drive for highly efficient numerical techniques to model the performance of complex structures. This often cannot be achieved by conventional computer systems, but rather through using the so-called high performance computing (HPC) systems that utilize hardware acceleration. We review recent General Purpose Graphics Processing Units (GPGPU) computing strategies introduced in four fields of computational electromagnetics: Finite-Difference Time-Domain (FDTD), Finite Elements Method (FEM), Method of Moments (MoM) and ElectroMagnetic Ray Tracing (EMRT). |
| Author(s): | A. Capozzoli, O. Kilic, C. Curcio, A. Liseno |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1501 KB |
| Title: | The Success of GPU Computing in Applied Electromagnetics |
| Abstract: | In the field of electromagnetic modeling, whether it is the complex designs for engineered materials or devices and components integrated within their natural environments, there is a big drive for highly efficient numerical techniques to model the performance of complex structures. This often cannot be achieved by conventional computer systems, but rather through using the so-called high performance computing (HPC) systems that utilize hardware acceleration. We review recent General Purpose Graphics Processing Units (GPGPU) computing strategies introduced in four fields of computational electromagnetics: Finite-Difference Time-Domain (FDTD), Finite Elements Method (FEM), Method of Moments (MoM) and ElectroMagnetic Ray Tracing (EMRT). |
| Author(s): | A. Capozzoli, O. Kilic, C. Curcio, A. Liseno |
| File Type: | Express Journal Paper |
| Issue: | Volume: 33 Number: 2 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1501 KB |
| Title: | The PMC-Amended DB Boundary – A Canonical EBG Surface |
| Abstract: | Replacing realistic materials and structures by their ideal counterparts, canonical surfaces, is of great interest for initial and conceptual electromagnetic (EM) studies. The recently introduced DB boundary is defined by a set of simple boundary conditions forcing the normal components of the D- and B- fields to be zero at the boundary. We show that this DB boundary produces many 2-D scattering results that are similar to how practical so-called electromagnetic bandgap (EBG) surfaces behave within the bandgap. Still, it is not directly useable as a canonical EBG surface, because, as we demonstrate in this paper, it is incomplete, creating an anomaly for normal incidence which causes unphysical field solution for 3-D field problems. We have removed this anomaly by introducing the PMC-amended DB boundary. This works in the same way as a practically realized EBG surface for both 2-D and 3-D problems within the bandgap, and is therefore a canonical EBG surface. |
| Author(s): | P. Kildal, A. Kishk, M. Bosiljevac, Z. Sipus |
| File Type: | Journal Paper |
| Issue: | Volume: 26 Number: 2 Year: 2011 |
| Download Link: | Click here to download PDF File Size: 1539 KB |
| Title: | The New Scheme for Data Rate Improvement in HF Communication without using Equalizer |
| File Type: | Conference Paper |
| Issue: | Volume: System Architectures and Analysis Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 190 KB |
| Title: | The Multiresolution Frequency Domain Method for the Efficient Analysis of Ferrite Loaded Waveguides |
| File Type: | Conference Paper |
| Issue: | Volume: Finite Difference Methods: Recent Developments and Applications Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 457 KB |
| Title: | The Joy of Computing with Volume-Integrals |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Electromagnetics for Nondestructive Evaluation and Materials Characterization Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 95 KB |
| Title: | The Joy of Computing with Volume Integrals: Validation and Performance Comparison |
| Abstract: | This is the second paper in a series dealing with the application of computational electromagnetics to nondestructive evaluation, using the vehicle of volume-integral equations, as developed in the preceding paper in this volume. A challenge-problem in the field of nondestructive evaluation is the inspection of fastener sites for fatigue cracks in multilayer structures. Using the volume-integral equation approach, problems comprising multilayer structures, ferromagnetic fastener sites, gaps between materials interfaces, and the presence of fatigue cracks are accurately modeled. Simulated studies are presented with VIC-3D©, a proprietary volume-integral code, and comparisons are made with FEM highlighting performance advantages of the VIE approach. Further, the role that volume-integral equations play in the context of other well-known computational-electromagnetic algorithms is discussed. |
| Author(s): | H. A. Sabbagh, R. K. Murphy, E. H. Sabbagh, J. C. Aldrin, J. S. Knopp, M. P. Blodgett |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 9 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 1979 KB |
| Title: | The Influence of Thermal Deformation on the AMB-rotor System of HTR-PM Helium Circulator |
| Abstract: | Helium circulator is the core component of High Temperature Reactor-Pebblebed Modules (HTRPM), and its rotor is supported by active magnetic bearings (AMBs). The windings of the motor and AMBs will generate a great deal of heat due to Ohmic loss, which increases the temperature of the circulator. The high temperature will cause the thermal deformation of AMB-rotor system, leading to the clearance change between rotor and AMBs. The AMB stiffness and inductive transducer sensitivity will be affected by the changed clearance, which decrease the stability of the AMB-rotor system. In this paper, through theoretical analysis and finite element analysis (FEA), the influence of thermal deformation on the AMB stiffness and transducer measurement is studied. The simulation and experiment for the AMB-rotor system in the circulator is carried out to explore the performance of AMB controllers and the influences of thermal deformation on the unbalanced response of the AMB-rotor system is analyzed. The theoretical calculations in this paper has general applications in the controller improvement of AMBs under clearance change and provides a reference for mechanical structure design and controller design of AMBs. |
| Author(s): | J. Yu, G. Du, H. Wang, Z. Sun, L. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 7 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1871 KB |
| Title: | The Impact of Vertical Structures on Ship Radar Cross Section in the High Frequency Range |
| Abstract: | The monostatic and bistatic Radar Cross Section (RCS) of various complex ship targets are numerically simulated in the High Frequency range of 3- 20 MHz. The process by which these complex ship models are built and simulated using the FEKO code is described. Validation of the simulated RCS against fullscale measurements is described. Details are added to the ship model and the changes in the bistatic RCS are explored. Bistatic data from the simulations are used to assess the performance of a pair of surface-wave radar stations operated in a bistatic mode. The results of these findings will be of importance to future RCS simulation work using numerical modelling. |
| Author(s): | R. C. Solomon, H. Leong, C. W. Trueman, Y. M. M. Antar |
| File Type: | Journal Paper |
| Issue: | Volume: 24 Number: 4 Year: 2009 |
| Download Link: | Click here to download PDF File Size: 304 KB |
| Title: | The Impact of Surface Roughness on Avalanche Frequency |
| File Type: | Conference Paper |
| Issue: | Volume: S09 Efficient Optimization of High Frequency Structures II Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 281 KB |
| Title: | THE FEMAX FINITE-ELEMENT PACKAGE FOR COMPUTING THREE-DIMENSIONAL ELECTROMAGNETIC FIELDS |
| Abstract: | The structure and the properties of the FEMAX package are discussed. The FEMAX finite-element package is an efficient and highly accurate package especially designed for computing three-dimensional transient as well as time-harmonic electromagnetic fields in arbitrarily inhomogeneous, (an)isotropic media. The most unique features of the FEMAX package are that 1) the electric field strength is computed directly, i.e. without the intermediate use of (vector) potentials, 2) when inhomogeneities are encountered in the domain of computation, the package automatically chooses edge elements to ensure that all local continuity conditions can be met, nodal elements are used elsewhere, and 3) that the electromagnetic compatibility relations are taken into account in the formulation of the finite-element method used, thus avoiding spurious solutions. These features are included in the package in such a way that optimum results are obtained both in regard to computational efficiency (storage and time) and in regard to the desired accuracy. [Vol. 11, No. 2 (1996), pp 24-31] |
| Author(s): | Gerrit Mur, Gerrit Mur |
| File Type: | Journal Paper |
| Issue: | Volume: 11 Number: 2 Year: 1996 |
| Download Link: | Click here to download PDF File Size: 766 KB |
| Title: | The Estimation of Rotors Parameters Based on Micro-Doppler Characteristics |
| File Type: | Conference Paper |
| Issue: | Volume: 11-WA-4 Scattering Center Models and Their Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 580 KB |
| Title: | The Effect on a Human Heart Model from Dipole Antenna, with an without Shield on SAR and Temperature Increase |
| Abstract: | In this paper, investigate effect of dipole antenna over human heart and a comparative study of temperature increased at heart and specific absorption rate (SAR) without and with different material shields. These structures are modeled and numerically tested by using finite element method (FEM) by using Comsol Multiphysics. The created virtual models using 3D simulation and computation software proved that used shield around human heart reduce the effects of EM fields. The simulation outputs used as measures for this comparative study include the increased temperature and specific absorption rate (SAR), which SAR determines the amount of radiation that human tissue absorb. In addition, study effects of variation of distance of shield from antenna and simulated temperature and SAR. |
| Author(s): | S. I. Zonoori, S. V. Makki, A. Torabi |
| File Type: | Journal Paper |
| Issue: | Volume: 30 Number: 11 Year: 2015 |
| Download Link: | Click here to download PDF File Size: 1829 KB |
| Title: | The design of Reflectarray using Dual Resonant Characteristics of Mushroom like Structure |
| File Type: | Conference Paper |
| Issue: | Volume: Latest Developments of Reflect/Transmit Array Antennas Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 587 KB |
| Title: | The Design of a Spherical Wire Frame Radar Target Using Mathematica for Structure and WIPL for Radar Cross Section |
| File Type: | Conference Paper |
| Issue: | Volume: Electromagnetic Modeling by WIPL-D Software Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 1009 KB |
| Title: | The Design and Experimental Verification of Broadband Absorbing Structure Combined by Resin and Lossy Periodic Structures |
| File Type: | Conference Paper |
| Issue: | Volume: 1-SP-6 Electromagnetic Periodic Structures: Theories, Concepts, Construction and Realization Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 208 KB |
| Title: | The Complex Frequency-Shifted PML Discontinuous Galerkin Time-Domain Method on Unstructured Meshes |
| File Type: | Conference Paper |
| Issue: | Volume: Finite-Volume and Discontinuous Galerkin Time-Domain Techniques Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 126 KB |
| Title: | The Comparison of EMF Monitoring Campaigns in Vicinity of Power Distribution Facilities |
| Abstract: | Monitoring of electromagnetic field (EMF) near power distribution facilities, both in the low- and the high-frequency ranges, has become highly demanded in recent years. The reason lies in the accumulated concerns on public health, which is mostly caused by the evolution of electric power and communication infrastructure, in and around the power substations, as well as their closeness to residential areas. In this paper, the initial comparative analysis of the EMF monitoring results of three one-day campaigns, in 2015, 2018 and 2020, performed in the vicinity of the Serbian highpower distribution substation “Novi Sad 7”, is presented. The overall EMF levels in all campaigns comply with the reference levels prescribed by the Serbian legislation, including some new EMF sources which were detected in 2018 and 2020. Likewise, the used continuous monitoring has demonstrated suitability to systematically address EMF fluctuation on daily basis, as well as corresponding concerns on EMF exposure. |
| Author(s): | G. S. Nedic, N. M. Djuric, D. R. Kljajic |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 1 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 21425 KB |
| Title: | The Combination of Generalized Single-Source TEPA and Contact-Region Modeling for Solving Array Structures |
| File Type: | Conference Paper |
| Issue: | Volume: 9-P-2 Poster Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 314 KB |
| Title: | The Challenge of Introducing Curved Material Geometries into Structured High-Order Finite-Di erence Methods |
| File Type: | Conference Paper |
| Issue: | Volume: Higher Order Numerical Methods Number: Year: 2012 |
| Download Link: | Login To Download (For Members) File Size: 670 KB |
| Title: | The Associated Hermite FDTD Method with Non-uniform Grid Scheme |
| File Type: | Conference Paper |
| Issue: | Volume: S44 FDTD Method and Applications Number: Year: 2023 |
| Download Link: | Login To Download (For Members) File Size: 1352 KB |
| Title: | The application of nested dissection to the solution of a 2.5D electromagnetic problem |
| Abstract: | We use the method of nested dissection to solve a 2.5D finite difference electromagnetic problem. This method is considered in some detail, and we have found that the expected theoretical run time savings over more common methods are realised in practice. The program has been used to model EM propagation in coal seams with a view to detecting seam disruptions, which can cause a loss of production in longwall mining operations. Various experimental results and a field survey are discuessed and we are able to use these results to construct a physically reasonable model which explanes the field data. Some further realistic geological structures are modelled and a comparison between out modelling program and several independent methods show satisfactory agreement. |
| Author(s): | G.H. Smith, P.R. Williamson, K. Vozoff, G.H. Smith, P.R. Williamson, K. Vozoff |
| File Type: | Journal Paper |
| Issue: | Volume: 15 Number: 2 Year: 2000 |
| Download Link: | Click here to download PDF File Size: 1193 KB |
| Title: | THE APPLICATION OF NESTED DISSECTION TO THE SOLUTION OF A 2.5D ELECTROMAGNETIC PROBLEM |
| Abstract: | We use the method of nested dissection to solve a 2.5D finite difference electromagnetic problem. This method is considered in some detail, and we have found that the expected theoretical run time savings over more common methods are realised in practice. The program has been used to model EM propagation in coal seams with a view to detecting seam disruptions, which can cause a loss of production in longwall mining operations. Various experimental results and a field survey are discussed and we are able to use these results to construct a physically reasonable model which explains the field data. Some further realistics geological structures are modelled and a comparison between our modelling program and several independent methods shows satisfactory agreement. |
| Author(s): | G. H. Smith, P. R. Williamson, K. Vozoff, G. H. Smith, P. R. Williamson, K. Vozoff |
| File Type: | Journal Paper |
| Issue: | Volume: 5 Number: 2 Year: 1990 |
| Download Link: | Click here to download PDF File Size: 1916 KB |
| Title: | The Analysis of the Additional Substance Influence on the Grounding Grid Parameters by FEM |
| File Type: | Conference Paper |
| Issue: | Volume: Low Frequency Electromagnetic Applications Number: Year: 2005 |
| Download Link: | Login To Download (For Members) File Size: 0 KB |
| Title: | The Analysis of Multistep Cylindrical Structure on the Dielectric Surface for Wideband Radar Cross Section Reduction at Normal Incidence |
| File Type: | Conference Paper |
| Issue: | Volume: 1-3-E Electromagnetic Compatibility I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 193 KB |
| Title: | TF/SF Separation Characteristics in the 3D NS-FDTD Technique Using Rectangular Cells |
| File Type: | Conference Paper |
| Issue: | Volume: S03 Algorithms for Unique Applications I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 998 KB |
| Title: | Terahertz Evanescent Wave Tunneling in Bianisotropic Thin Films |
| File Type: | Conference Paper |
| Issue: | Volume: S05 Microwave/Millimeter Wave and Terahertz Devices and Applications I Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 224 KB |
| Title: | Technique to Enhance the Bandwidth of a Cylindrical Dielectric Resonator Antenna |
| File Type: | Conference Paper |
| Issue: | Volume: S27 EM Modelling of Milli Meter Wave Antennas and its Applications - II Number: Year: 2021 |
| Download Link: | Login To Download (For Members) File Size: 1569 KB |
| Title: | Technical Feature Article "Using Joint TimeFrequency Domain Analysis to Analyze Time Domain Simulations of Shielding Structures |
| Abstract: | |
| Author(s): | |
| File Type: | Newsletter Paper |
| Issue: | Volume: 18 Number: 1 Year: 2003 |
| Download Link: | Click here to download PDF File Size: 1038 KB |
| Title: | T-Junction Power Divider Based on Rectangular Microcoaxial Structure in W-band |
| Abstract: | In this paper, a W-band T-junction power divider based on rectangular microcoaxial structure is proposed. Rectangular microcoaxial line is a threedimensional (3D) structure with the merits of wide operation bandwidth, low loss, and high integration, which is suitable for the design of radio frequency (RF) devices. A two-way power divider is designed based on the rectangular microcoaxial structure. And the two-way power divider is expanded into a four-way power divider to further illustrate the design method. Moreover, a back-to-back configuration including two identical two-way power dividers is fabricated and measured. The insertion loss of the back-to-back configuration is about 0.11–1.18 dB in W band, which agrees with the simulation one reasonably and shows good performance. |
| Author(s): | Z.-Y. Huang, B.-Y. Liu, Y. Jiang, W.-T. Yuan, Q.-P. Wang, W.-D. Hu, N.-C. Yuan |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 10 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2707 KB |
| Title: | System-Level EMC Antenna Coupling Analysis for Large, Complex Structure Topologies Using a Multi- Fidelity Modeling and Simulation Approach |
| File Type: | Conference Paper |
| Issue: | Volume: Computer Modeling and Simulation Number: Year: 2003 |
| Download Link: | Login To Download (For Members) File Size: 134 KB |
| Title: | Synthesis of NFC Antenna Structure under Multi-Card Condition |
| Abstract: | Wireless communication technologies such as Near Field Communication (NFC) found its way into our everyday life. The antenna structures used in such systems have to comply with several standards to achieve all requirements defined for the specific application. However, in practice there are scenarios for such antennas which are not considered in standards or design guides, but mainly influence the antenna behavior. In the present paper the synthesis of an antenna used for NFC-cards in a contactless payment system under multi-card condition is presented. The optimization relies on the differential evolution (DE) strategy. The computation of the forward problem is based on the partial element equivalent circuit (PEEC) method. |
| Author(s): | P. Baumgartner, T. Bauernfeind, O. Biro, C. Magele, W. Renhart, R. Torchio |
| File Type: | Journal Paper |
| Issue: | Volume: 33 Number: 10 Year: 2018 |
| Download Link: | Click here to download PDF File Size: 1593 KB |
| Title: | Synthesis of NFC Antenna Structure under Multi-Card Condition |
| File Type: | Conference Paper |
| Issue: | Volume: S04 Antenna Optimization for RFID Applications Number: Year: 2018 |
| Download Link: | Login To Download (For Members) File Size: 587 KB |
| Title: | Switchable Multiband Monopole CRLH Antenna |
| Abstract: | In this paper, a switchable multiband monopole composite right/left-handed (CRLH) antenna is designed, fabricated and measured. The structure consists of a monopole loaded with three CRLH unit cells. By incorporating the three unit cells it aids in generating multiband frequencies. The switchable antenna is developed by placing the pin diodes which enables the simultaneous operation of unit cells. A detailed parametric study is done to investigate the influence and the effect of CRLH cells dimensions. The simulation and measured results are in good agreement. The results show multiple bands from 1-4 GHz. The measured maximum gain of antenna is 3.13 dBi. |
| Author(s): | A. K. Alqallaf, R. K. Dib, M. F. Karim |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1136 KB |
| Title: | SURFACE MODELLING FOR EM INTERACTION ANALYSIS |
| Abstract: | This paper deals with the numerical modelling of the surface of a structure with a wire grid or a surface patch for Electromagnetic (EM) interaction analysis. Surface currents and fields on a wire grid model are computed using the Numerical Electromagnetics Code (NEC). The results are compared with those obtained on a triangular surface patch model using an Electric Field Integral Equation (EFIE) formulation. Simple structures such as a square plate as well as complicated structures such as an aircraft are considered. Good agreement is obtained in most cases. [Vol. 6, No. 2, pp. 38-52 (l99l)] |
| Author(s): | S. Kashyap, A. Loule, S. Kashyap, A. Loule |
| File Type: | Journal Paper |
| Issue: | Volume: 6 Number: 2 Year: 1991 |
| Download Link: | Click here to download PDF File Size: 587 KB |
| Title: | Suppressing Characteristics of TVS Device under Electromagnetic Pulse |
| File Type: | Conference Paper |
| Issue: | Volume: 3-3-E Electromagnetic Environment Effects I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 259 KB |
| Title: | Superformula-inspired Split-ring Resonators with Applications to Compact Bandpass Filters |
| File Type: | Conference Paper |
| Issue: | Volume: S04 RF Filters and Resonators Number: Year: 2019 |
| Download Link: | Login To Download (For Members) File Size: 602 KB |
| Title: | Super-Broadband Rectifier with Wide-band Resistance Compression Network and Harmonic Cycling for RF-Harvesting |
| Abstract: | In this paper, a super-broadband (SBB) rectifier using a wideband resistance compression network (WRCN) and harmonic cycling is proposed, simulated, fabricated, measured and analyzed in detail for the harvesting of ambient radio frequency (RF) energy. Meanwhile, impedance compression and matching are achieved to implement the SBB using WRCN and impedance operation networks. Additionally, harmonic cycling structure and bending technology are employed to improve the power conversion efficiency (PCE) and reduce the size, respectively. For demonstration, a prototype of the proposed rectifier is fabricated and measured. The measured results are in good accordance with the simulated ones, indicating that the rectifier can provide high efficiency and ultra-broadband rectification characteristics. A PCE over 50% is realized at 3.5 GHz with an input power range of 6–24 dBm, and a PCE of 75% is obtained at an input power of 18 dBm. The PCE is greater than 50% at 17 dBm with an input frequency of 2.7-4.6 GHz. This work can find significant applications in the development of RF-harvesting. |
| Author(s): | X. Liu, D. Zhang, Y. Li, Z. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 1 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 543 KB |
| Title: | Successes and Frustrations in the Solution of Large Electromagnetic Problems in Supercomputers |
| File Type: | Conference Paper |
| Issue: | Volume: S26 Big Data Aspects of Computational Electromagnetics Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 590 KB |
| Title: | Subwavelength Focusing In The Infrared Range Using A Meta Surface |
| File Type: | Conference Paper |
| Issue: | Volume: S05 Novel Photonic Material and Devices I Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 399 KB |
| Title: | Subgrid Representations of Objects for NS-FDTD Calculations Based on Mie Theory for Layered Structures |
| File Type: | Conference Paper |
| Issue: | Volume: S20 Advanced Computational Techniques in Electromagnetics Number: Year: 2015 |
| Download Link: | Login To Download (For Members) File Size: 176 KB |
| Title: | Study on Differential Signaling with the Decoupling Capacitor in the Rectangular Power-Bus Structure |
| File Type: | Conference Paper |
| Issue: | Volume: Applied CEM for EMC Applications Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 189 KB |
| Title: | Study on Array Source Stirring Reverberation Chamber |
| Abstract: | Because the structure of transmitting antenna significantly affects the performance of source stirred reverberation chamber, a source stirring reverberation chamber excited by antenna array with a novel configuration is proposed and investigated in this paper. In contrast to traditional source stirring techniques, fewer array elements in reasonable arrangement are employed to use the test space efficiently and ensure the desired field characteristics, such as uniform statistics, isotropic and random polarization. Numerical experiments demonstrate that the statistical distribution of electrical field meets Standard IEC 61000-4-21 and has advantage over the traditional stirring systems. |
| Author(s): | W. Li, C. Yue, W. Yu |
| File Type: | Journal Paper |
| Issue: | Volume: 29 Number: 12 Year: 2014 |
| Download Link: | Click here to download PDF File Size: 730 KB |
| Title: | Study of the Optical Black Hole with the FDTD Method |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling of Metamaterials and Transformation Based Devices Number: Year: 2011 |
| Download Link: | Login To Download (For Members) File Size: 1274 KB |
| Title: | Study of S-shaped Structure in UWB Antenna with Dual-band Notched Characteristics |
| File Type: | Conference Paper |
| Issue: | Volume: 2-4-A Fast Numerical Analysis for Electromagnetic Radiation and Scattering Number: Year: 2017 |
| Download Link: | Login To Download (For Members) File Size: 237 KB |
| Title: | Study of Metamaterial Miniaturization Using Magnetic Composites |
| File Type: | Conference Paper |
| Issue: | Volume: Modeling Techniques for Periodic Structures and Metamaterial Applications - II Number: Year: 2008 |
| Download Link: | Login To Download (For Members) File Size: 117 KB |
| Title: | Studies of Bi-static Scattering of Arbitrary Targets using Multiresolution Time Domain |
| File Type: | Conference Paper |
| Issue: | Volume: Advances in Finite-Difference Time Domain Modeling Number: Year: 2004 |
| Download Link: | Login To Download (For Members) File Size: 417 KB |
| Title: | Strategies for Improving Inverse Methods for Eddy Current NDE Corrosion Characterization |
| File Type: | Conference Paper |
| Issue: | Volume: Computational Electromagnetics for Nondestructive Evaluation Number: Year: 2006 |
| Download Link: | Login To Download (For Members) File Size: 73 KB |
| Title: | Stop-Band Filter using A New Metamaterial Complementary Split Triangle Resonators (CSTRs) |
| Abstract: | In this paper, a compact stop-band microstrip filter based on a new complementary split triangle resonator (CSTRs) is presented. We first describe the structure of the resonator and present its characteristics, which are essentially a simultaneous negative-? and negative-?. Then, we apply the complementary of this structure on a microstrip device. The result gives stop-band filter with high rejection band around the resonance frequency of the CSTRs (3.2GHz). The substrate used is the FR4. |
| Author(s): | M. A. Abaga Abessolo, Y. Diallo, A. Jaoujal, A. El Moussaoui, N. Aknin |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 4 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 840 KB |
| Title: | Stochastic Radiation Model for Cable Bundle with Random Wires |
| Abstract: | Cable bundle is often the main radiation structure due to its length in automotive electrical or electronic systems. Random wire positions in a cable bundle is a challenge for the modeling in perspective of Electromagnetic Compatibility (EMC). This work addresses the uncertainty property of a cable bundle due to its random wire positions, through a stochastic-model approach. Random wire position distributions in a bundle adopt Gaussian norm. A spline interpolate function is used to improve the continuity of wires along the bundle. To calculate the common-mode (CM) current on the bundle, the composed non-uniform wires are modeled by cascaded uniform segments or Chebyshev Expansion Method based smooth lines. Further CM current based bundle radiation is calculated using electric-dipole model. Proposed modeling methodology is assessed by comparing CM current and radiation predictions versus measurement data and theoretical results. Predictions agree well with measurements especially in statistics. |
| Author(s): | J. Jia, Z. Lai, J. Lei, Q. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 3 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 3674 KB |
| Title: | Stable Partial Inductance Calculation for Partial Element Equivalent Circuit Modeling |
| Abstract: | Accurate and stable analytical solutions for partial element calculation in partial element equivalent circuit (PEEC) modeling are desirable due to fast and simple usage. Conventional analytical formulae based on integral Neumann formula may give miscalculations when we compute the partial inductance of three-dimensional structures with large spacing. In this paper, a novel model-order reduction (MOR) method is presented for mutual inductance calculation in order to improve its accuracy and stability. Mutual inductances of higher order models are represented by relatively lower order models. The criteria for MOR are revealed and a code implementation routine is described. The numerical accuracy, stability and calculation cost are investigated comparing with conventional procedures. Numerical experiments show that the MOR method can guarantee numerical stability and reduce calculation complexity simultaneously, and it has advantages to be implemented in PEEC modeling for large complex electronic systems. |
| Author(s): | Z. Song, F. Duval, D. Su, A. Louis |
| File Type: | Journal Paper |
| Issue: | Volume: 25 Number: 9 Year: 2010 |
| Download Link: | Click here to download PDF File Size: 919 KB |