ACES Publication Search
There are 13 search results for:
| Title: | ACES Journal December 2024 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 18984 KB |
| Title: | ACES Journal December 2024 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 255 KB |
| Title: | ACES Journal December 2024 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 1969 KB |
| Title: | Circularly Polarized Plane Wave Source Implementation in Time-domain Electromagnetic Simulations |
| Abstract: | A unified framework for implementing circularly polarized plane wave sources in time-domain electromagnetic simulations is presented. Unlike traditional approaches that require separate settings for the orthogonal components as different sources, our method integrates circular polarization states represented in frequency domain seamlessly into time-domain simulations. We also studied the effectiveness of the approach when broadband sources are used. This framework is applicable to both finite-difference time-domain (FDTD) and pseudospectral time-domain (PSTD) methods. |
| Author(s): | J. W. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 371 KB |
| Title: | Outdoor Wi-Fi Dual-band Dual-polarized Base Station Antenna Design |
| Abstract: | In this manuscript, a dual-band and dualpolarized coupled patch array antenna operating at 2.45 GHz and 5.8 GHz for outdoor Wi-Fi applications is proposed. Two sets of antenna arrays made of four-element stacked patches act as main radiators. The height of this antenna is 0.04λ0, which is much smaller than the general size of other low-profile antennas. The arrays are fed by two feed ports which are used to separately feed vertical and horizontally polarized signals with stable port isolation. The antenna structure also employs a duplex filter to filter 2.4-2.484 GHz and 5.1-5.9 GHz operating band frequencies. The measured impedance bandwidths of the prototype antenna structure are 2.41- 2.484 GHz and 5.1-5.9 GHz, respectively. The isolation between the two ports is greater than 20 dB, and the cross-polarization level is better than 20 dB in the operating bands. In addition, the average gain of the prototype antenna is approximately 13 dBi in horizontal and vertical polarization. Overall, because of the stable structure, high reliability, small size, and light weight of the patch antenna, the outdoor base station antenna has a huge potential market value, this antenna is a good candidate for commercial outdoor Wi-Fi applications. |
| Author(s): | Y. Fan, L. Li, R. K. Arya, X. Ma, S. Kong, J. Dong |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 15643 KB |
| Title: | Design of a Miniaturized Symmetrical E-shaped MIMO Antenna with Low Coupling |
| Abstract: | In order to meet the demand of contemporary 5G mobile communication for miniaturized MIMO antenna systems, this paper proposes a symmetric Eshaped patch antenna. It is mainly realized by digging out the simple rectangular radiation patch, and etching four rectangular slots at the ground plane to widen the working bandwidth. The overall size of the antenna is 20 mm × 40 mm. However, there is current mutual coupling between the two radiation patches closely arranged up and down, which greatly affects the radiation effect of the antenna. Therefore, in order to reduce the coupling degree between each other, a 1 × 3 metamaterial (MTM) array structure is added between the two patches, in which the structure of the MTM unit is similar to a “concave” character. Simulation and real measurement of antennas using 3D electromagnetic simulation software HFSS and vector network analyzer, and the test results show that the proposed antenna is S11 <-10 dB in 5.32-6.02 GHz (relative bandwidth of 12.35%), the isolation degree S21 is above -18 dB throughout the operating frequency band, and the overall Envelope correlation coefficient (ECC) is less than 0.02 in the working band, which further confirms that the designed MIMO antenna has good isolation. The radiation pattern of the antenna is good, which is suitable for the basic requirements of 5G WLAN band. |
| Author(s): | X. Zheng, Z. Zhao, Y. Pan, T. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 45897 KB |
| Title: | A Novel Design for Four-port Metamaterial SRR-loaded MIMO Antenna for 5G and Wireless Communication Applications |
| Abstract: | In this paper, a new high-polarization metamaterial structure design for a multiple-input, multipleoutput (MIMO) antenna with robust isolation is introduced. The antenna design satisfies the requirements of C-band and S-band wireless communication networks up to sub-6 GHz 5G applications. The novel design of the antenna gets three frequency bands—5.8 GHz, 3.4 GHz, and 2.57 GHz—to be taken into consideration. After the integration of metamaterial components and without use of any further decoupling techniques, high isolation of more than 20 dB is achieved. By suppressing the propagation of surface waves, low-band resonators can reduce the mutual coupling between two higher bands. Ultimately, the initial coupling is canceled out using a splitring resonator (SRR) to minimize coupling in the low band. The stated MIMO antenna has a maximum return loss of -13, -18, and -21 dB and a mutual coupling of - 13, -18, and -21 dB. It covers the 2.5, 3.4, and 5.8 GHz bands, which are used for WLAN, LTE, and 5G. Within acceptable bounds, the envelope correlation coefficient is less than 0.01 and the total active reflection coefficient is less than -10 dB. The performance of MIMO antennas is observed practically and reported. |
| Author(s): | M. Rajakumar, M. Meena |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 1846 KB |
| Title: | An All-metal Antipodal Vivaldi Antenna Design for High-power Microwave Application |
| Abstract: | In this paper, the evolutionary process, fabrication and measurement of an all-metal antipodal Vivaldi antenna (AMAVA) design are presented for the highpower microwave (HPM) application. Derived from the substrate-loaded antipodal Vivaldi antenna, the proposed antenna is made all metallic to enhance its power handling capacity (PHC). Considering the further improvement of the radiation performance and antenna fixing, rectangular slots and tuning stubs with exponential corner cuts are employed in antenna design. In the air condition, the PHC values of the final proposed antenna are over 8000 W in its operating band. The proposed AMAVA is fabricated and measured in a microwave anechoic chamber. According to the measured results, the −10 dB impedance bandwidth covers 8.3-10.66 GHz, and its deepest resonance reaches −29.7 dB at 9.75 GHz. The measured radiation pattern values are in agreement with simulation values, and its peak gain values at 9.3 GHz, 9.8 GHz and 10.3 GHz are 4.54 dBi, 5.68 dBi and 5.71 dBi, respectively. A PHC experiment is conducted, which verifies the AMAVA is qualified for 8000 W-level PHC. |
| Author(s): | Z. Chen, R. Yin, Y. Jiang, X. Mao, P. Lv, S. Jiang, Y. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 6233 KB |
| Title: | Design of a Single-fed Gain-enhanced Circularly Polarized Patch Antenna for Microwave Power Transmission |
| Abstract: | A high-gain single-fed circularly polarized (CP) microstrip patch antenna for microwave transmission systems is proposed in this paper. Two narrow rectangular slots are added to the rectangular microstrip patch to enhance the antenna gain. The patch is rotated by 90° to form a cross microstrip patch antenna, and a pair of narrow microstrip strips are added at the edge of the cross patch along the -45° diagonal direction of the antenna to implement circular polarization. Two short rectangular microstrip lines are added on both sides of the narrow microstrips to adjust the phase of the current to further reduce the axial ratio (AR) value. The designed antenna model is simulated, fabricated and measured. The results of the measurement show that the antenna has a gain of 11.3 dB at the resonance frequency of 5.8 GHz, and the CP AR is 2.73 dB. The antenna can be applied to microwave power transmission systems and other personal wireless communication systems. |
| Author(s): | Z. Jiang, Z. Ma, X. Sun, W. Liang, H. Xing |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 2095 KB |
| Title: | Accelerated Variant Model-aided Optimization of Coupled Line Bandpass Filter |
| Abstract: | Here, a 5-row microstrip coupled line filter design with six different variable design parameters having a center resonance frequency of 2.45 GHz is considered as a multi-dimensional and single-objective optimization problem using a variant of the newly proposed Chameleon swarm algorithm. In this study, three different objective functions specially adapted from mathematical models were used for the current problem. Additionally, artificial neural network (ANN) modeling support was used for acceleration, thus eliminating the extra hardware cost that may be needed. The filter toolbox, which was recently released with the MATLAB 2021b version, was used throughout the optimization process. The study includes multiple innovations, including the updated algorithm, new toolbox and original objective functions. |
| Author(s): | A. Uluslu |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 590 KB |
| Title: | Performance Comparison Between Fingerprinting-based RSS Indoor Localization Techniques at WLAN Frequencies: Simulation Study |
| Abstract: | This paper presents a performance comparison between two fingerprinting-based received signal strength (RSS) indoor localization techniques at wireless local-area network (WLAN) frequencies: 2.4 GHz and 5.8 GHz. The investigated algorithms include the comparative RSS (CRSS) and vector algorithms. The study was conducted usingWireless InSite ray-tracer software. The simulation was conducted in a simulated environment on the 3rd floor of the Chesham Building, University of Bradford, UK. Also, we presented an estimator which looks at the correlation between the test point RSS and the reference point RSS. The estimator performance is compared to the root mean square error (RMSE) performance. It was found that the CRSS algorithm suffers from the similarity problem while constructing the radio map, and it also suffers from ambiguity problems during localization. The vector algorithm outperforms CRSS algorithms in both frequencies and does not suffer from similarity or ambiguity problems. The proposed estimator shows better performance at both frequencies. |
| Author(s): | H. Obeidat, E. Alzuraiqi, I. Trrad, N. Alhindawi, M. R. Rawashdeh |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 907 KB |
| Title: | Analysis of Induction-polarization Response Characteristics of Marine Controlled-source Electromagnetic Multiphase Composite Medium |
| Abstract: | The complex composition and structure of the submarine reservoir and its secondary pyrite, which are multiphase composite media, can provoke the induced polarization (IP) effect, resulting in the change of the marine controlled-source electromagnetic (CSEM) induction-polarization response, which directly affects geological interpretation results. In this paper, the generalized effective-medium theory of induced polarization (GEMTIP) model is introduced to study the influence of composition, structure and geometric characteristics of submarine reservoirs and secondary pyrite on the 3D marine CSEM induction-polarization response. We first construct the 3D finite-difference frequency-domain (FDFD) electromagnetic field governing equation based on the GEMTIP model, apply the emission source on the non-uniform grid, and solve the linear equations by using the difference coefficient matrix. Then we perform forward calculation on a typical 1D reservoir model to verify the correctness and effectiveness of the proposed algorithm. Finally, we design the reservoir and secondary pyrite models, and analyze the influence laws of IP parameters and polarization layer geometry parameters on the 3D marine CSEM induction-polarization response. These studies are of great value for understanding the relationship between submarine multiphase composite medium and electromagnetic wave propagation. |
| Author(s): | C. Gu, S. Li, S. Peng |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 2604 KB |
| Title: | Research on Electromagnetic Interference of Liquid Crystal Display Screen on Low-medium Speed Maglev Trains |
| Abstract: | Low-medium speed maglev trains might suffer from electromagnetic interference (EMI) during operation, which is specifically manifested as a blurred image on the liquid crystal display (LCD) screens of the passenger information system (PIS). In order to study the characteristics of the EMI, firstly, the working principle of PIS is analyzed in response to the fault phenomenon of the LCD screens. Possible interference sources are studied. Research results indicate that the leakage magnetic field generated by the transverse end effect of linear motors is the main interference source causing LCD screen faults. Secondly, the coupling mechanism of the EMI is analyzed. Results show that the transverse end effect can cause an increase in the ground potential of the LCD screen casing, resulting in a blurred image on the LCD screen. Finally, the EMI suppression method by suspending and grounding the LCD screen is proposed and its feasibility is verified. In this paper, we comprehensively study the EMI of LCD screens, which provides a theoretical basis for solving the tangible faults of maglev trains. |
| Author(s): | Y. Tang, X. Li, C. Zhou |
| File Type: | Journal Paper |
| Issue: | Volume: 39 Number: 12 Year: 2024 |
| Download Link: | Click here to download PDF File Size: 10114 KB |