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Title: ACES Journal February 2020 Cover
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
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Title: ACES Journal February 2020 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
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Title: ACES Journal February 2020 Full
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 21682 KB

Title: Comparative Study on Indoor Path Loss Models at 28 GHz, 60 GHz, and 73.5 GHz Frequency Bands
Abstract: In this paper, a comparative study between different indoor path loss prediction models is conducted. The investigated models include averaged wall loss model (AWM), single slope model (SSM), linear attenuation model (LM), two slope model (TSM), partitioned model (PM), and Motley-Keenan model (MKM). The models were tested in a simulated environment of the 3rd floor of Chesham building, the University of Bradford, a different set of frequencies were used including 28 GHz, 60 GHz, and 73.5 GHz, TSM shows the best performance, both AWM and MKM tend to have a similar performance at millimetrefrequencies, both models’ prediction for corridor and LOS regions are pessimistic while TSM, SSM, and LM have better estimations in these regions.
Author(s): H. A. Obeidat, A. A. Abdullah, M. F. Mosleh, A. Ullah, O. A. Obeidat, R. A. Abd-Alhameed
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1754 KB

Title: Near-Field Scattering of Typical Targets Illuminated by Vortex Electromagnetic Waves
Abstract: Based on the full-wave electromagnetic simulation and the principle of near-field diagnostics, the near-field scattering characteristics of typical scatterers illuminated by vortex electromagnetic waves are studied. It’s shown from the simulation data that the ability of identification of scatterer characteristics by vortex electromagnetic wave is higher. In addition to the amplitude and phase patterns, the orbital angular momentum (OAM) modal spectrum patterns of the scattering field also carry the information of the geometric shape and material characteristics. The application of OAM modal spectrum patterns will help to improve the ability of information acquisition and target detection of electromagnetic wave.
Author(s): H. Chen, Z. Zhang, J. Yu
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1620 KB

Title: A New Method for Stranded Cable Crosstalk Estimation Based on BAS-BP Neural Network Algorithm Combined with FDTD Method
Abstract: In this paper, based on the research of back propagation (BP) neural network algorithm optimized by the beetle antennae search (BAS) algorithm, a new method for predicting stranded cable crosstalk is proposed. Firstly, the stranded wire model and the equivalent multiconductor transmission lines model are both established. Then, the extraction network of the stranded wire electromagnetic parameter matrix is constructed by using the BAS-BP neural network algorithm. Finally, the network is combined with the finite difference time domain (FDTD) method to solve the near end crosstalk (NEXT) and far end crosstalk (FEXT) of a specific three-core stranded model. The new method has good agreement with the crosstalk results obtained by the electromagnetic field numerical method. The validity of the new method is verified.
Author(s): Q. Q. Liu, Y. Zhao, C. Huang, W. Yan, J. M. Zhou
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 5796 KB

Title: Frequency Splitting Based on Spoof Surface Plasmon Polaritons Coplanar Waveguide
Abstract: In this paper, a novel frequency splitter is proposed based on the spoof surface plasmon polaritons (SSPPs) coplanar waveguide (CPW). The proposed frequency splitter uses the semi-circular holes etched on the both sides of the middle line of the CPW to realize mode conversion and frequency splitting. The operating principles of the proposed frequency splitter have been analyzed by the dispersion curves, electric field distributions, and equivalent circuit. Moreover, the splitting frequency of the splitter can be easily controlled by changing the corresponding parameters. Furthermore, full-wave simulation along with the measured results are given to describe the performance of the proposed frequency splitter. The highly consistent between simulated and measured results validates the design conception, which means that the proposed design is of importance to develop surface-wave integrated circuits.
Author(s): J. Wang, Y. Liu, L. Zhao, Z.-C. Hao, L. Qiao, Y. Zhou, Y. Li
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 2125 KB

Title: A Qualitative Deep Learning Method for Inverse Scattering Problems
Abstract: In this paper, we propose a novel deep convolutional neural network (CNN) based qualitative learning method for solving the inverse scattering problem, which is notoriously difficult due to its highly nonlinearity and ill-posedness. The trained deep CNN accurately approximates the nonlinear mapping from the noisy far-field pattern (from measurements) to a disk that fits the location and size of the unknown scatterer. The used training data is derived from the simulated noisy-free far-field patterns of a large number of disks with different randomly generated centers and radii within the domain of interest. The reconstructed fitting disk is also very useful as a good initial guess for other established nonlinear optimization algorithms. Numerical results are presented to illustrate the promising reconstruction accuracy and efficiency of our proposed qualitative deep learning method.
Author(s): H. Yang, J. Liu
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 2387 KB

Title: Helmet Antenna Design Using Characteristic Mode Analysis
Abstract: The helmet antenna is required to achieve hands-free operation for disaster prevention. The helmet antenna is not only low profile with a small configuration, but it also suppresses radiation toward the human head. This paper presents the characteristic mode analysis of the helmet, which is a hemispherical conductor shell to achieve the omnidirectional pattern in the horizontal plane. By deleting the weak part of the electric current on the hemispherical conductor shell, the shape of the folded dipole was obtained with a low resonant frequency. The folded dipole antenna with a slit-loaded copper ring structure with high radiation efficiency and a low SAR value was designed.
Author(s): N. Michishita, H. Morishita
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1802 KB

Title: Gain Enhancement of a Dual-Band Planar Slot Dipole using AMC Plane for WBAN and WLAN Applications
Abstract: A dual band slot dipole antenna made from textile is proposed for Wireless Body Area Network and Wireless Local Area Network applications. The proposed antenna is integrated with an artificial magnetic conductor plane to mitigate backward radiation and reduce Specific Absorption Rate when operated on body. The artificial magnetic conductor plane is formed using a 3 x 3 array of unit cells, each consisting of a square patch integrated with diamond-shaped slot. The proposed antenna (denoted as Antenna B) is compared against another similar antenna (Antenna A) in free space and on-body, in flat condition (on chest) and under two bending axes (x- and y-axes) on the upper arm. Results indicate that Antenna B provided wider upper bandwidth to 766 MHz (in flat condition) and up to 875 MHz when bent. Besides that, higher gain of up to 5 dB with improved front-to-back ratio are also observed.
Author(s): F. N. Giman, P. J. Soh, M. F. Jamlos, H. Lago, A. A. Al-Hadi, S. K. A. Rahim, D. Schreurs, P. Akkaraekthalin, A. Beyer
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 2827 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: A High-Gain Microstrip Patch Antenna Using Multiple Dielectric Superstrates for WLAN Applications
Abstract: This paper presents the design and characterization of a microstrip patch antenna with multiple superstrates for performance enhancement operating at the central frequency of 5.5 GHz for high-gain WLAN applications. The performance of the antenna in terms of reflection loss and the gain are investigated using multiple high dielectric constant superstrates of Taconic CER-10 (εr=10.2). Numerical results showed that the patch antenna has -10 dB impedance bandwidth of 2.54% which improves to 8.43% and 17.43% by employing a single and dual superstrate, respectively. The gain of the antenna increases from 6.1 dBi to 9.5 dBi using a single superstrate, which further enhances to 13.6 dBi by placing two optimized superstrates. Moreover, further increasing the number of superstrates did not significantly impact on the performance of the patch antenna. The final design of the antenna (patch antenna with two superstrates) is fabricated and measured. The measured results agree well with the simulated results. Due to the good impedance matching, high-gain and desired radiation patterns compared to the other superstrate antennas, this antenna is a good candidate for high-gain WLAN applications.
Author(s): N. Hussain, U. Azimov, M. Jeong, S. Rhee, S. W. Lee, N. Kim
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1920 KB

Title: A Tri-Band Frequency Reconfigurable Slot Antenna for Wireless Applications
Abstract: With the increase in wireless services, the demand for antennas that can operate at more than one frequency has increased. This work proposes a slot antenna whose frequency of operation can be configured into three bands of 2.4 GHz, 5 GHz, and 3.5 GHz for the Wireless-Area-Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) applications. The switching between the three bands is achieved by two PIN diodes properly placed between the two sides of the slot. The antenna consists of a rectangular slot etched on the ground plane, while on the other side of the substrate, there is a microstrip line to feed the slot with an open stub for matching. The tri-band frequency reconfigurable slot antenna has been studied, and its parameters optimized using computer simulation Technology (CST-MWS). Parametric study on the slot dimensions and the microstrip feeding is presented. For verification of the simulation results, the antenna is fabricated and measured. The simulated and measured parameters such as return loss, radiation pattern, and gain show excellent agreement for the three operation bands.
Author(s): K. M. Younus, K. H. Sayidmarie
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1978 KB

Title: A Novel Omnidirectional Circularly Polarized Pagoda Antenna with Four Shorting Pins for UAV Applications
Abstract: A novel omnidirectional circularly polarized (CP) pagoda antenna with four shorting pins is presented. In this structure, four curved branches are utilized to generate horizontal polarization, while coaxial cable and four shorting pins produce vertical polarization. Omnidirectional CP radiation is achieved by combining the radiation from the branches and the shorting pins. The curved branches loaded with shorting pins reduce the size of the antenna and the antenna is loaded with the lower substrate with two coupling patches to improve the bandwidth. The novel pagoda antenna is fabricated and measured. Its final dimensions are 0.42λ0*0.42λ0*0.33λ0 (λ0 is the free-space wavelength at operating frequency). The impedance bandwidth (S11≤-10dB) is 0.53GHz and the axial ratio (AR) bandwidth (AR≤3dB) is 0.95GHz, which can be used for unmanned aerial vehicles’ diagram transmission in China.
Author(s): Z. Li, Y. Zhu, Y. Shen, X. Liu, G. Peng
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1781 KB

Title: A High-Efficient Wideband Transmitarray Antenna with Vias
Abstract: This paper presents a high-efficient wideband transmitarray antenna with vias. The transmitarray element consists of two layers of Jerusalem cross patches and four metal vias. Two Jerusalem cross patches are printed on both sides of the substrate and are connected by four symmetrical metal vias. The metal vias can improve the coupling strength between the two patches. By adjusting the size of the patch and the position of the metal vias, the transmission phase of the element is greater than 360º. Then, an transmitarray antenna consists of the proposed elements is designed, manufactured, and measured. The experiment results show that the maximum gain of the transmitarray antenna is 25.7dB, and the corresponding aperture efficiency is 46.6%. The measured 1-dB gain bandwidth is 14.9% (8.7GHz- 10.1GHz).
Author(s): Y. Zhang, X. Lv, L. Liu, Y. Yi, Z. Wu
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 2015 KB

Title: Design of a Dielectric-loaded Wide Beam Quad-ridged Horn Antenna
Abstract: A quad-ridged horn antenna with dielectric loading covering the 0.6 GHz to 4 GHz band is proposed. Through the comprehensive design of differential feeding, a quad-ridged flare and loaded dielectrics, the feed antenna can be used to match a reflector with a large illumination angle of approximately 150 degrees. In the working band, the reflection coefficient is less than -8 dB, the isolation is larger than 40 dB, and its crosspolarization discrimination is larger than 31 dB for both polarizations. To verify the simulations, a prototype is fabricated and measured, and the measurements are in good agreement with the simulations. A reflector with a diameter of 33 meters and a focal diameter ratio of 0.33 is adopted to analyze the in-dish performance of the feed. The simulated results show that an average efficiency of 55.16% is realized and that the problem of the efficiency decrease caused by beamwidth narrowing at high frequencies is solved.
Author(s): Y. Yu, W. Jiang, L. Qin, S. Gong
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 2550 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
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Title: An Analytic Method of Determining a Critical Cable Spacing for Acceptable Crosstalk
Abstract: Some wiring rules have been used to prevent crosstalk in industrial application, but the technical rationale is not clear. This paper aims at proposing an analytic method of determining a critical cable spacing for acceptable crosstalk. First of all, we derive a calculation function of crosstalk with cable spacing. Then, we discuss about the crosstalk characteristics according to the crosstalk function and its curve. On this basis, we define the critical cable spacing via a critical point on the curve and explain physical meaning of the critical point by use of the fringe field around the victim cable. After that, we analyze the influence of wiring parameters on the critical cable spacing. Finally, we conduct an experiment to validate the proposed method of the critical cable spacing.
Author(s): P. Xiao, W.-W. Ran, P.-A. Du
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
Download Link:Click here to download PDF     File Size: 1723 KB