The Applied Computational Electromagnetics Society Journal (ACES)最新文献

A 3-D Global FDTD Courant-limit Model of the Earth for Long-time-span and High-altitude Applications 用于长时间跨度和高海拔应用的三维全球 FDTD Courant-limit 地球模型

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-06-03 DOI: 10.13052/2024.aces.j.390205

Yisong Zhang, Dallin R. Smith, J. J. Simpson

{"title":"A 3-D Global FDTD Courant-limit Model of the Earth for Long-time-span and High-altitude Applications","authors":"Yisong Zhang, Dallin R. Smith, J. J. Simpson","doi":"10.13052/2024.aces.j.390205","DOIUrl":"https://doi.org/10.13052/2024.aces.j.390205","url":null,"abstract":"A new global 3-D finite-difference time-domain (FDTD) model is introduced to simulate electromagnetic wave propagation around the Earth, including the lithosphere, oceans, atmosphere, and ionosphere regions. This model has several advantages over existing global models, which include grids that follow lines of latitude and longitude and geodesic grids comprised of hexagons and pentagons. The advantages of the new model include: (1) it may be run at the Courant-Friedrichs-Lewy (CFL) time step (as a result, it is termed the Courant-limit model); (2) subgrids may be added to specific regions of the model as needed in a straight-forward manner; and (3) the grid cells do not become infinitely larger as the grid is extended higher in altitude. As a result, this model is a better candidate than the others for investigating electromagnetic phenomena over long time spans of interest and for investigating atmosphere-ionosphere-magnetosphere coupling. The new model is first described and then validated by comparing results for extremely low frequency (ELF) propagation attenuation with corresponding analytical and measurement results reported in the literature.","PeriodicalId":250668,"journal":{"name":"The Applied Computational Electromagnetics Society Journal (ACES)","volume":"36 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Symmetrical Fractal-based Balanced Branch-Line Coupler for Simultaneous Low- and Mid-band 5G Frequencies Applications 一种基于分形的对称平衡支线耦合器，可同时应用于中低频段 5G 频率

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381206

A. B. Shallah, Farid Zubir, Mohamad Kamal A. Rahim, Zubaida Yusoff

{"title":"A Symmetrical Fractal-based Balanced Branch-Line Coupler for Simultaneous Low- and Mid-band 5G Frequencies Applications","authors":"A. B. Shallah, Farid Zubir, Mohamad Kamal A. Rahim, Zubaida Yusoff","doi":"10.13052/2023.aces.j.381206","DOIUrl":"https://doi.org/10.13052/2023.aces.j.381206","url":null,"abstract":"Symmetry is a key factor for Branch-Line Couplers (BLCs) in RF and microwave systems. This balanced approach evenly distributes power between two output ports, aiding impedance matching and reducing unwanted coupling and crosstalk, while increasing input-output isolation. Furthermore, the symmetrical design of BLCs ensures favorable return loss and phase balance, which are essential for phase-sensitive detectors and beamforming. This symmetry also guarantees consistent performance over a wide frequency range, making it suitable for broadband or multi-frequency applications. We present a compact BLC operating in two frequency bands, ideal for 5G sub-6 GHz applications. It uses T-shaped lines with folded lines and stubs in a Minkowski fractal shape, resulting in a size reduction of 90%. The design and simulation were performed using the CST Microwave Studio at 0.7 GHz and 3.5 GHz, achieving a new high frequency band ratio of 5. A prototype on Rogers RT5880 substrate (εr=2.2,h=0.787 mm) was tested to validate the design’s effectiveness, offering potential for modern wireless applications requiring versatile frequency band operation.","PeriodicalId":250668,"journal":{"name":"The Applied Computational Electromagnetics Society Journal (ACES)","volume":"353 2‐3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Passive Adaptive Metamaterial Radome based on PIN Diodes 基于 PIN 二极管的无源自适应超材料天线罩

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381201

Ting-Ting Ge, Mingshun Li, Wei Song, Kai-Jiang Xu, Ke-Xin Xing, Xin-Qing Sheng

引用次数: 0

Multi-polarized Reconfigurable Antenna with Ground Plane Slot and Capacitance Feeding for UAV-to-everything Communications 用于无人机对万物通信的带地平面槽和电容馈电的多极化可重构天线

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381210

Seong‐Hyeop Ahn, Yu-Seong Choi, Mohamed Elhefnawy, Wang-Sang Lee

{"title":"Multi-polarized Reconfigurable Antenna with Ground Plane Slot and Capacitance Feeding for UAV-to-everything Communications","authors":"Seong‐Hyeop Ahn, Yu-Seong Choi, Mohamed Elhefnawy, Wang-Sang Lee","doi":"10.13052/2023.aces.j.381210","DOIUrl":"https://doi.org/10.13052/2023.aces.j.381210","url":null,"abstract":"This paper proposes a polarized reconfigurable antenna for unmanned aerial vehicles (UAVs) with flexible UAV-to-Everything (U2X) communications through a reduction of polarization loss. It operates at 2.45 GHz and consists of a square patch antenna, a capacitance feed, a ground surface slot, and a reconfigurable feeding network. The reconfigurable feeding network has dual polarization (linear, circular) depending on the configuration of the feeding network. The dual linear polarization reconfigurable feeding network configuration consists of a single-pole double-throw (SPDT) switch, a 50-ohm microstrip line, and a low-temperature co-fired ceramic (LTCC) 90-degree hybrid coupler. This was added to the circuit to form a double circular polarization reconfigurable feeding network. The proposed antenna has a miniaturized size (0.389λo×0.389λo×0.005λo), and is lightweight (12.2 g), making it suitable for low-height flight. Furthermore, it has maximum gains of 6.6 dBi and 7.2 dBi, in addition to an efficiency of 82%, and a 10 dB bandwidth of 4.5% (2.38-2.49 GHz). Therefore, the proposed antenna covers all UAV control links, video, and telemetry frequency bands (2.38-2.485 GHz).","PeriodicalId":250668,"journal":{"name":"The Applied Computational Electromagnetics Society Journal (ACES)","volume":"5 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140697052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Uncertainty Quantification and Optimal Design of EV-WPT System Efficiency based on Adaptive Gaussian Process Regression 基于自适应高斯过程回归的 EV-WPT 系统效率的不确定性量化和优化设计

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381202

Xinlei Shang, Linlin Xu, Quanyi Yu, Bo Li, Gang Lv, Yaodan Chi, Tianhao Wang

引用次数: 0

Resonant Frequency Modelling of Microstrip Antennas by Consensus Network and Student’s-T Process 利用共识网络和 Student's-T 过程对微带天线进行谐振频率建模

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381209

Xuefeng Ren, Yubo Tian, Qing Li, Hao Fu

{"title":"Resonant Frequency Modelling of Microstrip Antennas by Consensus Network and Student’s-T Process","authors":"Xuefeng Ren, Yubo Tian, Qing Li, Hao Fu","doi":"10.13052/2023.aces.j.381209","DOIUrl":"https://doi.org/10.13052/2023.aces.j.381209","url":null,"abstract":"When modelling and optimizing antennas by machine learning (ML) methods, it is the most time-consuming to obtain the training samples with labels from full-wave electromagnetic simulation software. To address the problem, this paper proposes an optimization method based on the consensus results of multiple independently trained Student’s-T Process (STP) with excellent generalization ability. First, the STP is introduced as a surrogate model to replace the traditional Gaussian Process (GP), and the hyperparameters of the STP model are optimized. Afterwards, a consistency algorithm is used to process the results of multiple independently trained STPs to improve the reliability of the results. Furthermore, an aggregation algorithm is adopted to reduce the error obtained in the consistency results if it is greater than the consistency flag. The effectiveness of the proposed model is demonstrated through experiments with rectangular microstrip antennas (RMSA) and circular microstrip antennas (CMSA). The experimental results show that the use of multiple independently trained STPs can accelerate the antenna design optimization process, and improve modelling accuracy while maintaining modelling efficiency, which has high generalization ability.","PeriodicalId":250668,"journal":{"name":"The Applied Computational Electromagnetics Society Journal (ACES)","volume":"31 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140696757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Single-mode Condition and Bending Loss Analysis of Ultrafast Laser-inscribed Mid-infrared Waveguides in GeAsSe Chalcogenide Glass GeAsSe Chalcogenide 玻璃中的超快激光刻蚀中红外波导的单模条件和弯曲损耗分析

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381207

Takashi Yasui

引用次数: 0

Design of Wilkinson Power Dividers with SITL Compensated Microstrip Bandpass Filters 利用 SITL 补偿微带带通滤波器设计威尔金森功率分配器

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381205

Ravee Phomloungsri, S. Srisawat, Somchat Sonasang, M. Chongcheawchamnan

引用次数: 0

Inductive Reactance Isolated Dynamic Seawater Monopole Antenna of High Efficiency 电感电抗隔离型高效动态海水单极天线

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381204

Lihua Li, Shimin Feng, Menglei Xiu

{"title":"Inductive Reactance Isolated Dynamic Seawater Monopole Antenna of High Efficiency","authors":"Lihua Li, Shimin Feng, Menglei Xiu","doi":"10.13052/2023.aces.j.381204","DOIUrl":"https://doi.org/10.13052/2023.aces.j.381204","url":null,"abstract":"The dynamic-type seawater monopole antenna has the problem of direct connection between its radiation body and the seawater. This makes the radiation current flow into the seawater, which leads to low radiation efficiency. In this paper, a dynamic-type seawater monopole antenna of high efficiency is proposed using an inductive reactance isolated method. Based on this method, a dynamic seawater antenna of seawater inductance isolation structure is designed. According to its equivalent circuit diagram, the principle and design basis of isolation are analyzed. The FEKO software is then used to simulate the antenna’s radiation efficiency. In addition, the impacts of the radius of the seawater inductance, the number of turns of the seawater coil, the diameter of the seawater coil, and the average turn spacing on the efficiency of the antenna are studied. Moreover, the experimental verification shows that the radiation efficiency of the designed dynamic seawater antenna with inductive reactance isolation structure can be greater than 70%. The value of the received carrier power in the case of inductance isolation is higher by 10 dB compared with the case without isolation.","PeriodicalId":250668,"journal":{"name":"The Applied Computational Electromagnetics Society Journal (ACES)","volume":"346 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mitigation of Feed Horn Overlapping Condition for Multi-beam Parabolic Reflector Antenna 缓解多波束抛物面反射天线的馈电喇叭重叠状况

The Applied Computational Electromagnetics Society Journal (ACES) Pub Date : 2024-04-16 DOI: 10.13052/2023.aces.j.381203

N. F. Fauzi, N. H. A. Rahman, Yoshihide Yamada, R. A. Awang, I. Pasya

{"title":"Mitigation of Feed Horn Overlapping Condition for Multi-beam Parabolic Reflector Antenna","authors":"N. F. Fauzi, N. H. A. Rahman, Yoshihide Yamada, R. A. Awang, I. Pasya","doi":"10.13052/2023.aces.j.381203","DOIUrl":"https://doi.org/10.13052/2023.aces.j.381203","url":null,"abstract":"In designing a contoured beam for communication satellite services, a reflector antenna remains the most preferred option. Previously, a multi-beam technique employing many feed horns at optimal feed positions was proposed to obtain a precise contour beam for Malaysia. However, it has led to feed horn overlapping when the beams were arranged closely. Therefore, this issue of beam allocation and feed horn size shall be addressed. In this article, an analysis of the relationship between feed position and beam direction is analysed through the Beam Deviation Factor (BDF). As a result, a useful design chart was derived for no feed horn overlapping conditions, which determines beam separation and feed horn size at different values of F/D. A practical application showing the Peninsular Malaysia beam coverage was demonstrated to validate the derived correlation. As a result, five multi-beams have been successfully designed with no overlapping feed horns. Through simulation, an excellent contour beam for Peninsular Malaysia was justified, featuring low side lobes, narrow beam width and high gain.","PeriodicalId":250668,"journal":{"name":"The Applied Computational Electromagnetics Society Journal (ACES)","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0