IEEE Transactions on Antennas and Propagation最新文献_第7页

Comments on “Characteristics of a Slotted Parallel-Plate Waveguide Filled With a Truncated Dielectric”

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-17 DOI: 10.1109/TAP.2024.3478352

B. Honarbakhsh

引用次数: 0

Enhanced Gain Extrapolation Technique: A Third-Order Scattering Approach for High-Accuracy Antenna Gain With Sparse Sampling, at Fresnel Distances

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-17 DOI: 10.1109/TAP.2024.3478330

Joshua A. Gordon;Benjamin L. Moser

{"title":"Enhanced Gain Extrapolation Technique: A Third-Order Scattering Approach for High-Accuracy Antenna Gain With Sparse Sampling, at Fresnel Distances","authors":"Joshua A. Gordon;Benjamin L. Moser","doi":"10.1109/TAP.2024.3478330","DOIUrl":"https://doi.org/10.1109/TAP.2024.3478330","url":null,"abstract":"In this article, we describe an enhanced three-antenna gain extrapolation technique that allows one to determine antenna gain with significantly fewer data points and at closer distances than with the well-established traditional three-antenna gain extrapolation technique that has been in use for over five decades. As opposed to the traditional gain extrapolation technique, where higher order scattering is purposely ignored, so as to isolate only the direct antenna-to-antenna coupling, we show that by incorporating third-order scattering, the enhanced gain extrapolation technique can be obtained. The theoretical foundation using third-order scattering is developed, and experimental results are presented comparing the enhanced technique and traditional technique for two sets of internationally recognized NIST reference standard gain horn antennas at the X band and the Ku band. We show that with the enhanced technique, gain values for these antennas are readily obtained to within stated uncertainties of ±0.07 dB using as few as ten data points per antenna pair, as opposed to ≈4000–8000 data points per antenna pair that is needed with the traditional technique. Furthermore, with the described enhanced technique, antenna-to-antenna distances can be reduced by a factor of 3, and up to a factor of 6 in some cases, compared to the traditional technique, a significant reduction in the overall size requirement of facilities used to perform gain extrapolation measurements.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9035-9049"},"PeriodicalIF":4.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulated Frequency-Selective Doubly Curved Sub-Reflector for a Dual-Band Multiple Spot Beam Communication Satellite Antenna System

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-15 DOI: 10.1109/TAP.2024.3476944

Andreas Ericsson;Min Zhou;Stig B. Sørensen;Tonny Rubæk;Mathieu Riel;Nelson J. G. Fonseca

引用次数: 0

Mixed Spatial-Spectral Domain Analysis of Spatially Dispersive Metasurfaces Using Higher-Order Boundary Conditions 利用高阶边界条件对空间离散元曲面进行空间-频谱混合域分析

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-15 DOI: 10.1109/TAP.2024.3476926

Jordan Dugan;Tom J. Smy;Shulabh Gupta

引用次数: 0

Universal Approximation Theorem and Deep Learning for the Solution of Frequency-Domain Electromagnetic Scattering Problems

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-15 DOI: 10.1109/TAP.2024.3476915

Ji-Yuan Wang;Xiao-Min Pan

{"title":"Universal Approximation Theorem and Deep Learning for the Solution of Frequency-Domain Electromagnetic Scattering Problems","authors":"Ji-Yuan Wang;Xiao-Min Pan","doi":"10.1109/TAP.2024.3476915","DOIUrl":"https://doi.org/10.1109/TAP.2024.3476915","url":null,"abstract":"Unlike the universal approximation theorems for functions mapping from a real-valued (RV) vector to an RV number or from a complex-valued (CV) vector to a CV number, in the field of electromagnetism, we need to approximate functions mapping from an RV vector to a CV number when we consider the electric field as a function of the spatial coordinate in the frequency domain. Typically, CV numbers contain phase information. When such phase information is handled properly, the performance of the neural networks (NNs) can be improved. This work derives a universal approximation theorem for functions mapping from an RV vector to a CV number. A deep NN, named HV-DL, is designed accordingly, which consists of an RV input layer, an RV module containing two branches, a CV module, and a CV output layer. The proposed universal approximation theorem is verified by numerical experiments on the HV-DL solution of the 2-D electric field integral equation (EFIE). To integrate the underlying physics of electromagnetic (EM) scattering into the proposed HV-DL, the loss function is computed according to the EFIE.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9274-9285"},"PeriodicalIF":4.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improved DGTD-GSTC Method Equipped With Normal Surface Polarizabilities for Oblique Incidence 改进的 DGTD-GSTC 方法，配备用于斜入射的法线表面极化能力

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-11 DOI: 10.1109/TAP.2024.3474921

Kaiming Wu;Qiang Ren

{"title":"An Improved DGTD-GSTC Method Equipped With Normal Surface Polarizabilities for Oblique Incidence","authors":"Kaiming Wu;Qiang Ren","doi":"10.1109/TAP.2024.3474921","DOIUrl":"https://doi.org/10.1109/TAP.2024.3474921","url":null,"abstract":"A novel transient solver based on the discontinuous Galerkin time-domain (DGTD) method incorporating generalized sheet transition conditions (GSTCs) for metasurfaces is proposed, which uses equivalent surface polarizabilities (SPs) instead of the actual structure of meta-atoms to achieve high efficiency. Compared with the previous work of the DGTD-GSTC method from the authors, this article takes the normal component of SP into account for the first time. These normal components play an important role in the accurate simulation of metasurfaces under oblique incidence at the expense of extra numerical simulation difficulty. To equip the normal SP in the DGTD method, we rigorously derive the new numerical flux with normal SP and propose the corresponding time integration scheme based on the explicit Runge-Kutta method. Numerical examples including the ideal model, the periodic array, and the curved metasurface are given. The results are compared with analytical results or commercial simulation software. The comparisons show that the proposed method can accurately obtain the macroscopic response of the metasurfaces. Finally, based on the example, the effects of the new numerical flux with SP on stability and choice of basis functions are discussed.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9317-9328"},"PeriodicalIF":4.6,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of Electromagnetic Field Exposure at 20–100 GHz for Clothed Human Body Using an Adaptively Reconfigurable Architecture Neural Network With Weight Analysis (RAWA-NN) Framework

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-11 DOI: 10.1109/TAP.2024.3474913

Ming Yao;Zhaohui Wei;Kun Li;Gert Frølund Pedersen;Shuai Zhang

{"title":"Prediction of Electromagnetic Field Exposure at 20–100 GHz for Clothed Human Body Using an Adaptively Reconfigurable Architecture Neural Network With Weight Analysis (RAWA-NN) Framework","authors":"Ming Yao;Zhaohui Wei;Kun Li;Gert Frølund Pedersen;Shuai Zhang","doi":"10.1109/TAP.2024.3474913","DOIUrl":"https://doi.org/10.1109/TAP.2024.3474913","url":null,"abstract":"In the context of forthcoming sixth-generation (6G) wireless communication, the sub-terahertz and terahertz frequency spectrum are anticipated. At such high frequencies, electromagnetic field (EMF) exposure assessment becomes significantly challenging, requiring substantial computational resources. This article is the first to utilize machine learning (ML) to predict EMF exposure levels for the clothed human body at 20–100 GHz, including temperature rises and absorbed power density (APD) at the exposed skin surface. To predict the EMF exposure, a reconfigurable architecture neural network with weight analysis (RAWA-NN) framework is proposed. This framework is based on the deep neural network (DNN) integrating the proposed weights-analyzer module and optimization module. The proposed novel framework streamlines the training process and reduces training time, while simultaneously adaptively optimizes the hyperparameters (hidden layers and hidden sizes) without the necessity for manual intervention during training and optimization. The model was trained using 70% of forearm data, with the remaining data for testing. Data from other body parts, such as the abdomen and quadriceps, was used to validate the model generalization. Compared to conventional dosimetry analysis, relative difference (RD) across various parameters remains below 2.6% across various parameters, for the same body part of the forearm, and below 9.5% for other body parts. There is an approximate four orders of magnitude improvement in assessment speed.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9286-9300"},"PeriodicalIF":4.6,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vortex Electromagnetic Wave Propagation in Magnetized Plasma

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-09 DOI: 10.1109/TAP.2024.3473027

Yiyun Wu;Moran Liu;Chen Zhou

{"title":"Vortex Electromagnetic Wave Propagation in Magnetized Plasma","authors":"Yiyun Wu;Moran Liu;Chen Zhou","doi":"10.1109/TAP.2024.3473027","DOIUrl":"https://doi.org/10.1109/TAP.2024.3473027","url":null,"abstract":"Based on the finite-difference time-domain (FDTD) model in the cylindrical coordinate, this article has studied the propagation characteristics of vortex electromagnetic waves (VEMW) in magnetized plasma. To more clearly characterize VEMW, this article has also studied the propagation of VEMW in a vacuum and the results show that VEMW in the vacuum can maintain vortex state and propagate in the direction of antenna radiation. In the magnetized plasma, VEMW is reflected at the cut-off height of each mode, and standing waves occur when the propagation is stable. The vortex state is distorted mainly near the center point, which is particularly serious in the extraordinary wave propagation region. In addition, the orbital angular momentum (OAM) density in magnetized plasma is no longer conserved as in vacuum, and there is a value of OAM density near the center point, which may be related to the collective motion of electrons. Due to the nonlinear interaction between VEMW and plasma, the plasma also presents a vortex state. This propagation model of VEMW can provide some theoretical support for the application of VEMW in ionospheric heating and shortwave communication.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9411-9420"},"PeriodicalIF":4.6,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of Planar and Curved Spiral Antennas Covered by 2-D Conformal Thermal Protection System

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-09 DOI: 10.1109/TAP.2024.3473023

Haoqing Wen;Qi Wu

{"title":"Design of Planar and Curved Spiral Antennas Covered by 2-D Conformal Thermal Protection System","authors":"Haoqing Wen;Qi Wu","doi":"10.1109/TAP.2024.3473023","DOIUrl":"https://doi.org/10.1109/TAP.2024.3473023","url":null,"abstract":"The conformal thermal protection system (TPS) is widely used to protect embedded antennas of hypersonic vehicles in high-temperature environments. An equivalent analytical equation for the radiation performance of a general circularly polarized (CP) antenna loaded with the conformal TPS is presented. Compared with planar TPS, conformal TPS leads to more complicated impacts on the antenna’s radiation performance, mainly manifested by main lobe splitting, gain reduction, and axial ratio (AR) deterioration. The extent of this effect is related to the curvature radius of the conformal TPS. A method to design a nonuniform impedance ground (IG) replacing the PEC ground to repair the degradation of the radiation performance by the conformal TPS is proposed. A broadband Archimedean spiral antenna loaded with a conformal TPS and a nonuniform IG is fabricated and measured to verify the proposed theoretical method. According to the simulation and measurement results, the antenna has an AR of less than 3 dB from 3 to 12 GHz and an AR beamwidth of 60° on average by loading the nonuniform IG. The main lobe splitting at 4 GHz is repaired, and the gain is improved by ~2.5 dB. A fully conformal model is proposed and fabricated with a conformal Archimedean spiral antenna and a conformal IG, which significantly reduces the antenna profile while using an asymmetric Archimedean spiral antenna resulting in a gain improvement of ~1 dB from 10 to 12 GHz.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9103-9116"},"PeriodicalIF":4.6,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Frequency-Reconfigurable Dual-Band and Dual-Polarization Antenna Based on Corrugated Meta-Structure

IF 4.6 1区计算机科学

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-08 DOI: 10.1109/TAP.2024.3472276

Zhang Wen Cheng;Jing Cheng Liang;Shi Sun;Ji Ran Chen;Meng Wang;Shimeng Wang;Feng Gao;Shuai Luan;Xin Liu;Tie Jun Cui;Hui Feng Ma

{"title":"Frequency-Reconfigurable Dual-Band and Dual-Polarization Antenna Based on Corrugated Meta-Structure","authors":"Zhang Wen Cheng;Jing Cheng Liang;Shi Sun;Ji Ran Chen;Meng Wang;Shimeng Wang;Feng Gao;Shuai Luan;Xin Liu;Tie Jun Cui;Hui Feng Ma","doi":"10.1109/TAP.2024.3472276","DOIUrl":"https://doi.org/10.1109/TAP.2024.3472276","url":null,"abstract":"A dual-band and dual-polarization antenna with independent frequency reconfigurable capacity is proposed. The antenna is composed of four radiation patches based on corrugated structure loaded with varactor diodes, where four radiation patches are arranged in orthogonal pairs to produce ±45° dual-polarization radiations. Due to the electronically controllable dispersion behaviors of the corrugated meta-structure, the low operating frequency can be arbitrarily controlled in the range from 3.48 to 3.72 GHz. In addition, short-circuit pins and another kind of varactor diodes are introduced in the radiation patches, which can create a high operating frequency ranging from 3.79 to 4.68 GHz without affecting the low resonant mode. Both simulated and measured results show well-controlled dual-band frequency independent reconfigurability of the proposed antenna, which exhibits good dual-polarization radiation and high isolation level. This frequency-reconfigurable dual-band antenna with stable dual-polarization characteristics may have potential applications in future smart wireless communication systems.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"72 12","pages":"9024-9034"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0