ACES Publication Search
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| Title: | ACES Journal July 2023 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1967 KB |
| Title: | ACES Journal July 2023 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 179 KB |
| Title: | ACES Journal July 2023 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 13520 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: | Failure Mechanism Analysis of the Stochastic Galerkin Method in EMC Simulation Considering Geometric Randomness |
| Abstract: | By virtue of its high calculational accuracy and efficiency, the stochastic Galerkin method (SGM) has been successfully applied many times in electromagnetic compatibility (EMC) simulation in recent years. This paper proposes a calculating example taking geometric uncertainty factors into consideration. As is proved in the paper, there is a relatively large error when using the SGM to solve the example mentioned above. According to failure mechanism, the fundamental reason of the failure of the simulation lies in the additional error caused by using numerical integration to solve the inner product formula. Meanwhile, it is proved that no additional errors are introduced when using the stochastic collocation method (SCM), so the SCM is better than the SGM in stability. In the end, the paper revised the general selective strategy for uncertainty analysis methods, thus providing theoretical basis for their universal application in EMC field. |
| Author(s): | J. Bai, B. Hu, Y. Wan |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1035 KB |
| Title: | Antenna Synthesis by Levin’s Method using Reproducing Kernel Functions |
| Abstract: | An antenna synthesis application is presented by solving a highly oscillatory Fourier integral using a stable and accurate Levin’s algorithm. In antenna synthesis, the current distribution is obtained by the inverse Fourier integral of the antenna radiation pattern. Since this integral is highly oscillatory, the Levin method can be used for its solution. However, when the number of nodes or the frequency increases, the Levin method becomes unstable and ineffective due to the large condition number of the interpolation matrix. Thus, an improved scheme of the method is used in an antenna synthesis application in which reproducing kernel functions are used as the basis of the approximation function. The accuracy of the new method is verified by a log-periodic antenna example. The error and stability analysis results show that the new method is more stable and accurate than other well-known kernels, especially for a large number of nodes. |
| Author(s): | G. Sener |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 10354 KB |
| Title: | Analysis and Design of Broadband OAM Array Antenna |
| Abstract: | This paper presents a Uniform Circular Array (UCA) antenna of crossed-dipole that can excite vortex waves in a wide frequency range from 3.5 GHz to 8.4 GHz. In the design process, the theoretical derivation of the influence on the Orbital Angular Momentum (OAM) when the antenna elements are arrayed in Co-directional Antenna Array (CAA) and Rotational Antenna Array (RAA) is given respectively. The fixed mode of the dipoles CAA is achieved by feeding each element with equal amplitude and 90° phase difference produced by the broadband feeding network. Furthermore, the proposed broadband OAM array antenna has been fabricated and measured to verify the predicted properties. The vortex electromagnetic wave with +1 mode could be excited in the bandwidth of 82.35%. Simulated and measured results are in good agreement. The proposed OAM array antenna is simple in design principle, compact in structure and low in profile, making this array antenna an excellent candidate for broadband OAM communication systems. |
| Author(s): | Y. Zhang, S. Zhao, X. Li, L. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 6213 KB |
| Title: | A Miniaturized UWB Bandpass Filter Employing Multi-Stub-Loaded Short-Circuited Stepped Impedance Ring Resonator |
| Abstract: | This article presents a novel microstrip line topology implementation of an ultra-wideband (UWB) bandpass filter. The proposed topology is a shortcircuited stepped-impedance ring resonator with an open-circuit stub and a short-circuit stub loaded at the central vertical position of the low impedance of this resonator, respectively. Within the UWB spectrum, five modes are allocated under weak coupling, and to increase filter selectivity, two transmission zeros are added. It is possible to extend the upper stopband and provide sufficient external coupling by utilizing interdigitalcoupled lines. To demonstrate the design theory, a prototype is designed and manufactured on a 0.8 mm thick substrate of the affordable F4B-2, and its performance is verified. Measurements show a 3-dB bandwidth span from 2.8 to 9.5 GHz, insertion loss of 0.36 dB, and return loss better than 13 dB. |
| Author(s): | G. Wei, Y. Wang, J. Liu, H. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 11339 KB |
| Title: | Edge Hole Effect on Isolation of UWB MIMO RDRA for 5G Outdoor Applications |
| Abstract: | For 5G sub-6 GHz outdoor applications, a highly isolated two-port rectangular dielectric resonator antenna (RDRA) with UWB MIMO is presented in this research. For isolation enhancement purposes at the lower frequency band (2.27 GHz-2.62 GHz), a longitudinal slot is inserted at the ground plane. For isolation enhancement at the higher frequency band (3.9 GHz-5.73 GHz), an edged hole is inserted in the RDRA. Investigations are conducted on the impacts of slotted ground as well as edged hole radius on isolation. The orthogonal feeding scheme ofUWBMIMO RDRA considering both edged hole and slotted ground plane effects are investigated. For the edged hole MIMO RDRA with a slotted ground plane, isolation is better than -24.7 dB at a higher frequency band and is better than -15.5 dB at a lower frequency band. This isolation improvement is explained by the surface current density distribution. The use of an edged hole RDRA and an aperture-coupled orthogonal feeding allows UWB bandwidth and good efficiency performances on the 5G operating bands. To justify the MIMO performance, the envelope correlation coefficient (ECC) and diversity gain (DG) are applied. |
| Author(s): | T. G. Abouelnaga, E. A. Abdallah |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 11641 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: | 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: | Balanced Filtering Power Divider based on Odd-mode Hybrid Microstrip and Slotline Spoof Surface Plasmon Polaritons |
| Abstract: | In this paper, an ultra-wideband balanced filtering power divider (B-FPD) with high common mode (CM) suppression level is proposed. The B-FPD is designed based on the odd mode spoof surface plasmon polaritons (SSPPs), which are constructed by the hybrid folded microstrip and slotline (HFMS) structure. Firstly, the dispersion characteristic and electric field distribution of the HFMS SSPP unit cell are investigated, which can decrease the upper cut-off frequency for size reduction of nearly 50%. Next, an equal balanced power divider with low cut-off frequency is proposed based on the microstrip-to-slotline transition structure and slotline Y-junction. Then, the balanced power divider is used to excite the odd mode of HFMS SSPP structure. An equal B-FPD with center frequency of 4.0 GHz is implemented, and the 3-dB bandwidth covers 0.9 to 7.0 GHz. Finally, the B-FPD with advantages of high CM suppression level and compact size is fabricated and measured. |
| Author(s): | Y. Song, A. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 8670 KB |
| Title: | Residual Flux Measurement of Single-phase Transformers based on Equivalent Resistance |
| Abstract: | Due to the presence of transformer residual flux, the magnetic flux of the core rapidly reaches saturation, thus causing an inrush current when the noload transformer is directly connected to the grid, which affects the safe operation of the grid. Therefore, it is necessary to study the residual flux in the core to reduce the inrush current. However, the residual flux estimation has a large error. In this paper, a method is proposed to measure the residual flux of the transformer core by solving equivalent resistance and determining the direction of residual flux by the difference between the forward and reverse transient currents. In addition, the relationship between residual flux and equivalent resistance is established, and the empirical formula is obtained for calculating the residual flux. To evaluate the effectiveness of the proposed method, the residual flux of the square core is measured on the constructed experimental platform. Compared with the experimental results, the relative error of the residual flux of the core calculated by the proposed method is within 6%, which has higher accuracy and provides a reference for residual flux estimation. |
| Author(s): | Q. Wang, Y. Ren, Y. Wang, C. Liu, S. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 7 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2690 KB |