IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C最新文献

Stub switched phase shifter 短截开关移相器

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-10-26 DOI: 10.1109/APS.2000.875337

K. Nakada, T. Marumoto, R. Iwata

引用次数: 6

Profile inversion of spherical objects illuminated by TE- and TM-polarized waves TE和tm极化波照射下球形物体的剖面反演

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.874585

M. Akhtar, A. Omar

引用次数: 2

On the relations of microscopic and averaged material parameters in composite media 复合介质中材料细观参数与平均参数的关系

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.873837

P. Belov, C. Simovski, M. S. Kondratjev

引用次数: 0

Improved and simpler FDTD formulation for axisymmetrical problems 改进和简化了轴对称问题的时域有限差分公式

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.873750

M. Celuch-Marcysiak, W. Gwarek

{"title":"Improved and simpler FDTD formulation for axisymmetrical problems","authors":"M. Celuch-Marcysiak, W. Gwarek","doi":"10.1109/APS.2000.873750","DOIUrl":"https://doi.org/10.1109/APS.2000.873750","url":null,"abstract":"Axisymmetrical structures play an important role in high frequency research and engineering. Examples of application include horn and rod antennas, circular waveguide discontinuities, resonators, and particle accelerators. Two FDTD formulations for axisymmetrical problems have been proposed by Gwarek, Morawski and Mroczkowski (1993) and by Jurgens and Saewert (1995). Both operate on a 2D mesh, and account analytically for azimuthal sin(m/spl phi/)/cos(m/spl phi/) field dependence. The two approaches lead to different field update equations and in practice-to somewhat different results. Both algorithms require special treatment of on-axis components, which may cause instabilities or, as we show in this paper, ambiguous solutions. We propose an FDTD formulation for axisymmetrical problems, based on a new mesh construction scheme and a new set of system variables, which: eliminates the need for special on-axis equations; remains stable, and consistent for different axis locations on the mesh; and requires less computer operations per time step than the scheme of Jurgens. We also show that the differences between the two methods are due to different assumptions regarding local field behaviour in cylindrical coordinates, and that the choice of a better approximation is determined by circuit technology.","PeriodicalId":324296,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117180573","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: 2

Characteristics of digital terrestrial broadcasting antennas. (2) unbalance fed modified batwing antenna 数字地面广播天线的特性。(2)不平衡馈电改良蝙蝠翼天线

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.875269

Y. Ojiro, H. Kawakami

{"title":"Characteristics of digital terrestrial broadcasting antennas. (2) unbalance fed modified batwing antenna","authors":"Y. Ojiro, H. Kawakami","doi":"10.1109/APS.2000.875269","DOIUrl":"https://doi.org/10.1109/APS.2000.875269","url":null,"abstract":"The digital terrestrial broadcasting station will use multiple channels in common. Therefore, the required properties of the transmitting station will be broad bandwidth and high gain. The authors have previously (see IEEE AP-S Int. Symposium, p.1570-3, July 1999) investigated the 2-element modified batwing antenna with the reflector (2MBWAR) for UHF used in digital terrestrial broadcasting. It was calculated with the balanced feed shape. As a result, the broadband input impedance of 100 /spl Omega/ was obtained. However, in practical use, this antenna requires the balun and the impedance transformer as another circuit. So it has the complex feed system and high cost. In this paper, we propose the unbalance fed modified batwing antenna (UFMBA) which does not use a balun and an impedance matching circuit. The same broad bandwidth and high gain compared with the previous feed shape are obtained. Next, the parallel coupling UFMBA to obtain high gain is investigated. The gain of about 14 dBi is obtained for coupling four elements.","PeriodicalId":324296,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C","volume":"25 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120924137","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: 6

A handset terminal evaluation system by field simulator 基于现场模拟器的手机终端评估系统

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.874946

H. Arai, N. Ohnishi, H. Saito, K. Sasaki

引用次数: 2

SFELP: a hybrid 3D-finite elements/segmentation method with fast frequency sweep based on the SyMPVL algorithm for the analysis of passive microwaves circuits SFELP:一种基于SyMPVL算法的快速扫频三维有限元/分割混合方法，用于无源微波电路分析

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.875435

J. Rubio, J. Garcia, J. Zapata

{"title":"SFELP: a hybrid 3D-finite elements/segmentation method with fast frequency sweep based on the SyMPVL algorithm for the analysis of passive microwaves circuits","authors":"J. Rubio, J. Garcia, J. Zapata","doi":"10.1109/APS.2000.875435","DOIUrl":"https://doi.org/10.1109/APS.2000.875435","url":null,"abstract":"The segmentation technique has been widely used for the full-wave analysis of microwave circuits to reduce CPU time and memory requirements. When this technique is implemented by linking multimode and multiport matrices of the different regions in which the circuit is divided, these matrices must be obtained for a great number of frequencies if a broad band analysis is required. In this paper, it is the SFELP method (segmentation/finite elements/Lanczos-Pade) is introduced. This method applies the symmetric Pade via Lanczos algorithm (SyMPVL) to a 3D-finite elements/segmentation method (3D-FE/SM) for obtaining a reduced order model of the transfer function of each region in which a 3D analysis is used. The result for each region is the multimode multiport generalized admittance matrix (GAM) on a wide band of frequencies from which the generalized scattering matrix (GSM) is computed. Then, the global response of the circuit can be immediately obtained by connecting the partial GSMs.","PeriodicalId":324296,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127173307","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: 4

A SVD-based reconstruction scheme for microwave radiometers measurements 一种基于奇异值分解的微波辐射计测量重建方案

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.874870

G. Mazzarella, M. Migliaccio

引用次数: 2

Sensor and method fusion in remote sensing imagery with neural networks 基于神经网络的遥感图像传感器与方法融合

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.874875

Y. Shkvarko, S. Medvedev, R. Jaime, J. Ruiz

{"title":"Sensor and method fusion in remote sensing imagery with neural networks","authors":"Y. Shkvarko, S. Medvedev, R. Jaime, J. Ruiz","doi":"10.1109/APS.2000.874875","DOIUrl":"https://doi.org/10.1109/APS.2000.874875","url":null,"abstract":"The need for sensor and method fusion arises in many practical applications, one of those is extended object imaging in passive remote sensing/imaging (RSI) systems that employ different platforms of sensors. In this paper we propose a new approach to solving simultaneous image restoration problems incorporating fusion of all RSI systems by integrating these problems into one augmented inverse problem by imposing the minimum entropy (ME) image model as prior knowledge for restoration (Falkovich et al. 1989). We investigate the fine structure of a Hopfield neural network and propose a sensor fusion method that can be implemented via modification of such a network into the maximum entropy neural network (MENN) using minimum entropy regularization. It is shown that applying the proposed method, the sensor and/or method fusion tasks can be solved without principal complication of the resultant structure of the MENN independent of the number of sensor platforms or methods to be fused. The overall MENN algorithm is presented. The results are illustrated by simulation samples and compared with other high resolution image restoration techniques.","PeriodicalId":324296,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124877529","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: 3

Analysis and design of conical spiral antennas using the FDTD method 用时域有限差分法分析和设计锥形螺旋天线

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C Pub Date : 2000-07-16 DOI: 10.1109/APS.2000.874512

T. Hertel, G.S. Smith

引用次数: 14