ACES Publication Search
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Title: | ACES Journal September 2024 Cover |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 1969 KB |
Title: | ACES Journal September 2024 Front/Back Matter |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 188 KB |
Title: | ACES Journal September 2024 Full |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 21072 KB |
Title: | A Novel Multi-objective Synthesis Method of Non-uniform Excitation Sparse Square Planar Transmitting Array Antenna for Microwave Wireless Power Transmission |
Abstract: | A novel multi-objective optimal subarray partitioning synthesis method for non-uniformly excited sparse square planar array (NESSPA) antenna is proposed for the problems of maximizing beam collection efficiency (BCE) and minimizing excitation difference (diff ) in microwave wireless power transmission (MWPT). The algorithm adopts the multi-objective particle swarm optimization algorithm based on the set of non-dominated solutions (NDSMOPSO) proposed in this paper, which determines the non-dominated solutions in the swarm according to the fitness value and updates the population during the evolution process; the array element positions and excitations are optimized simultaneously in each iteration. In addition, the performance parameter diff proposed in this paper can effectively measure the performance of the array; in general, the smaller the diff, the better the array performance. The effectiveness of the algorithm is demonstrated through a large number of simulations and, according to the method proposed in this paper compared with other twostep methods, a higher BCE can be obtained with fewer subarrays. |
Author(s): | J. Li, R. Zhang, Z. Han |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 943 KB |
Title: | A Dual-polarized Reflectarray Antenna for High-speed Ka-band Satellite Communications |
Abstract: | A small-sized reflectarray antenna array with compact production specifications is designed and fabricated for high-speed Ka-band communication systems. In the design phase, firstly, the reflection characteristics of unit cells used in the reflective surface are obtained by the full wave computational analysis tool, CST Microwave Studio. Secondly, an aperture efficiency analysis is carried out to determine the physical size of the reflectarray and the distances between the feeding antenna and the individual unit cells. Then, the entire reflectarray antenna is analyzed by array theory to obtain geometrical dimensions to be used in the fabrication phase. These results are verified by CST Microwave Studio and similar fabrication guidelines are obtained for both TE and TM polarizations. In the fabrication phase, the carefully tailored design parameters of the unit cells are used to build the antenna and measure important parameters such as radiation patterns, gain, cross polarization levels and S11 parameters, which agree with the results obtained in the design phase. The proposed reflectarray antenna makes it possible to support dualpolarized multi-beams in the range 18-20 GHz with stable gain behavior, which makes it possible to use it in high speed 5G satellite communication systems. |
Author(s): | A. H. Gulseren, S. Yilmaz, A. Alparslan, N. T. Tokan |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 8799 KB |
Title: | Optimized Deep Graph Shallow Attention Neural Network Based Four-port Multiple-input-multiple-output Antenna Design for Sub-6 GHz 5G Applications |
Abstract: | This paper proposes a novel, four-port multiple-input-multiple-output antenna system that is considered for sub-6 GHz 5G applications. A compact multi-band circular printed monopole antenna (MCPMA) is designed for determining the appropriate dimensions of size 110.16×360 mm. The device operates from 0.6 to 1 GHz. To improve cell isolation, four slits are positioned at an angle on the common ground. Deep graph shallow attention neural network with adaptive gold rush optimization algorithm (DGSANN-AGROA) is employed to create a model establishing the relationship among transmission coefficients and antenna geometric parameters. Following this, an adaptive gold rush optimization algorithm (AGROA) is utilized to enhance the antenna array’s decoupling. It showcases pattern diversity, a valuable characteristic for multiple-input-multiple-output implementation. Simulations were conducted using HFSS19 software versions, followed by an evaluation of the introduced antenna in MATLAB. The multiple-input-multiple-output antenna demonstrates favorable diversity characteristics with acceptable diversity gain (>9.5 dB) and envelope correlation coefficient (ECC) (≤0.009). |
Author(s): | E. Suganya, T. A. J. M. Pushpa, T. Prabhu |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 2549 KB |
Title: | Bandwidth and Gain Improvement of a Circularly Polarized Slot Antenna Using Nonuniform Metasurface |
Abstract: | This paper presents a novel design of a circularly polarized antenna based on a nonuniform metasurface (NMS). The original antenna comprises a uniform metasurface (UMS) layer and a slot antenna below. In order to achieve circularly polarized (CP) radiation, an oblique slot is etched on the center patch, and the size ratio between the center patch and the surrounding patches is adjusted to create the NMS. To further enhance the CP properties, an improved NMS (INMS) is proposed, consisting of four units with corners removed, building upon the original NMS design. Simulation results demonstrate that the proposed antenna design offers an S11 bandwidth ranging from 4.39 to 7.21 GHz, with a 3 dB axial ratio (AR) bandwidth spanning from 5.43 GHz to 6.76 GHz. Compared to the original UMSbased antenna, the INMS design shows an average gain increase of 1.21 dB, with a peak gain of 9.49 dBic. Furthermore, utilizing characteristic mode analysis (CMA), this paper explores the modal behaviors when applying the NMS to the antenna. The results indicate that this configuration excites two orthogonal modes, leading to CP radiation and the emergence of an additional AR minimum point. These factors contribute to the broader bandwidth observed in the proposed antenna design. The outstanding radiation performance of the proposed antenna design makes it suitable for various applications, including military and civilian communication, as well as point-to-point links. |
Author(s): | Q. Chen, J. Yang, C. He, L. Hong, T. Yan, F. Yu, D. Zhang, M. Huang |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 1587 KB |
Title: | Transformation Optics-based Antenna for Focusing OAM Beams |
Abstract: | In this article, a metamaterial horn antenna based on transformation optics (TO) is presented to generate a focused orbital angular momentum (OAM) beam. By applying the coordinate transformation, a metamaterial insertion inside the horn is designed to concentrate the radiated OAM beam. The TO-based insertion is further realized by using split ring resonators (SRRs). The metamaterial antenna is fabricated and measured to verify the design. A 13° reduction in the main lobe angle is realized in measurement by SRRs. |
Author(s): | J.-T. Jing, W. Song, X.-Q. Sheng |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 2658 KB |
Title: | A Novel Reconfigurable Chipless RFID Tag Based on Notch Filter |
Abstract: | A novel reconfigurable chipless RFID tag to enhance encoding capacity is proposed in this paper. The entire transmission network includes four noninteracting ports that are independent separately. The reconfigurability can be realized by combining different ports to get different encoding results. To increase the anti-interference capability of the tag, a method of cross-combination for unit coders is proposed according to the spacing distances of the unit coders. The encoding ability of about 8-bit information can be obtained by using the compact tag structure with a dimension of 70×70 mm2 and the encoding capacity can be increased by increasing the number of unit coders. Code “1” or “0” is defined by arranging the appearance or disappearance of a unit coder. Typical encoding examples are presented and the simulation results match well with the measurement results, demonstrating the effectiveness of the proposed tag. The proposed tag can be used for structural health monitoring with the advantages of battery-free, large information capacity, and flexible usage. |
Author(s): | L. Zhang, A. K. Poddar, U. L. Rohde, M. S. Tong |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 8410 KB |
Title: | Modeling and Analysis of a Proposed AC-DC C-Core Heteropolar Radial Hybrid Magnetic Bearing |
Abstract: | In this study, a new C-Core heteropolar radial hybrid magnetic bearing (HRHMB) driven by a three-phase power inverter is proposed. The use of a three-phase inverter driving technology improves the performance of magnetic bearings in terms of cost and power consumption. The force-current and the forcedisplacement characteristics of the proposed HRHMB are linear and the magnetic field coupling between the X and Y directions is significantly reduced. To analyze the proposed HRHMB, the configuration, working principle and required mathematical model based on the equivalent magnetic circuit (EMC) method are firstly presented. Then the load capacity and important parameters design are deduced. A comparison between the results obtained by the used analytical approach and those given by the finite element method (FEM) allowed verification of the developed mathematical model’s accuracy. Compared with the twelve-pole HRHMB, the proposed HRHMB improves bearing capacity, reduces mass, and enhances cost efficiency and performance, making it highly suitable for large journal diameter applications. |
Author(s): | N. Boutra, R. Mehasni, M. Feliachi |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 2108 KB |
Title: | Calculative Method on Electromechanical Strength for Rectangular and T-Shaped Rail over a Flat Surface Armature |
Abstract: | The electromagnetic railgun launching (EMRL) system is a type of long-range projectile launch that does not require any chemical propellant and can accelerate masses ranging from milligrams to kilograms to velocities of more than several kilometers per second. To make the rail stronger, electromechanical strength analysis was performed by calculating the area’s moment of inertia and critical velocity. One of the most essential mechanical aspects of rails is their moment of inertia, which has a direct impact on critical velocity and launch performance. Geometry and material both have an impact on the rails’ electromechanical performance. This paper describes the increase in electromechanical performance achieved by constructing two types of rail cross-sections - rectangular rails and T-shaped rails - based on structural analysis and current distribution from coupled electromagnetic (EM) simulation. The investigation found that T-shaped rails have higher moments of inertia than rectangular rails for the same crosssectional area and width. However, the mechanical performance differences between the two geometries are not significant. Therefore, the advantage of larger moments of inertia for a given cross-sectional area is limited. EM analysis has been extended to a 3-D finite element method (FEM) for both rails by linking it with Simplorer using the Maxwell-Simplorer coupled (MSC) method with a flat surface C-shaped armature. When compared to rectangular and T-shaped rails, the T-shaped rail has a lower current density at the inner curvature but a greater at the contact interface. |
Author(s): | M. N. S. Kumar, R. Murugan, J. Lydia, S. L. S. Vimalraj |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 1336 KB |
Title: | Cable Interference Analysis of Gas Insulated Substation Based on Domain Decomposition Method-Multilevel Fast Multipole Algorithm |
Abstract: | To explore cable interference in gas insulated substations (GIS), this paper proposes a reliable and efficient computational approach. The hybrid domain decomposition method-multilevel fast multipole algorithm (DDM-MLFMA) is presented herein. This technique determines the specifications of GIS cables for RG58 and AWG23. Self and mutual interference are identified utilizing very fast transient overvoltage (VFTO) transient interference signal.This hybrid technique offers a numerical simulation to replicate the impact of the VFTO interference signal. Utilizing the matrix-vector multiplication (MVX) product to address compression and approximation challenges, the hybrid approach proves reliable and pragmatic. Because of its computational nature and explicit factorization reduction, this strategy reduces computation time and memory requirements. Consequently, the system’s complexity follows a linear trend under this proposed approach. The computed results are juxtaposed with traditional methodologies to validate the effectiveness of the proposed algorithm. |
Author(s): | A. Mueed, W. Tang, M. Asif, R. Ma |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 1444 KB |
Title: | Integral Sliding Mode Control with Exponential Approximation Law for an AMB Rotor System Considering the Alford Force |
Abstract: | In order to deal with the nonlinear problems associated with the Alford force and active bearing rotor system in fluid machinery, an integral sliding mode control with exponential reaching law is proposed in this paper. An integral term is incorporated into the switching function, and an exponential approaching law, along with a boundary layer saturation function that replaces the symbolic function, is adopted to suppress the chattering and tracking error of sliding mode control. Simulation and experimental results show that, under the magnetic bearing force and Alford force, the system exhibits improved anti-disturbance performance compared to a PID controller. Moreover, the rotor amplitude is reduced by 33% when using this controller. The proposed controller demonstrates good dynamic performance and strong robustness, even when the parameters of the entire system are perturbed. |
Author(s): | S. Zhang, J. Zhou |
File Type: | Journal Paper |
Issue: | Volume: 39      Number: 9      Year: 2024 |
Download Link: | Click here to download PDF File Size: 4889 KB |