IEEE Antennas and Propagation Society International Symposium 1997. Digest最新文献_第9页

Modal analysis of coupled circular horns in a metal body of revolution 金属公转体中耦合圆角的模态分析

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631866

J. Reiter, F. Arndt

引用次数: 3

A new approach to analysis of arbitrary shaped, single or multilayered printed antennas based on surface equivalence principle and multiple network theory 基于表面等效原理和多重网络理论的任意形状单层或多层印刷天线分析新方法

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625443

F. T. Hamedani, A. Tavakoli

引用次数: 6

A highly controllable MESFET active patch antenna/oscillator 一种高度可控MESFET有源贴片天线/振荡器

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.630077

Wenzhang Wang, L. Pearson

引用次数: 1

Design and development of linear and circular polarized C-band offset Gregorian reflector antenna for VSAT application VSAT用直线和圆极化c波段偏置格里高利反射天线的设计与研制

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631861

H. Moheb, C. Robinson, N. Moldovan

{"title":"Design and development of linear and circular polarized C-band offset Gregorian reflector antenna for VSAT application","authors":"H. Moheb, C. Robinson, N. Moldovan","doi":"10.1109/APS.1997.631861","DOIUrl":"https://doi.org/10.1109/APS.1997.631861","url":null,"abstract":"Advances in communication satellite industry have made it possible to utilize smaller antennas in two-way communications networks, commonly known as VSAT (very small aperture terminal) networks. These typically range in aperture size from 60 cm to 4.5 m. It is now possible to build a system with antennas having significantly less gain than the conventional 3.8 m reflector antenna satisfying the 2/spl deg/ satellite spacing. However, the most driving criteria is to meet the FCC, ITU and similar sidelobe requirements which call for off-main beam radiation to satisfy 29-25 log /spl theta/ envelope for antennas having D//spl lambda/<50. For frequency re-use satellites radiation for cross-polarized components frequently have to be controlled to better than 30 dB cross-polarization in the 1 dB contour. A conventional solution is to use an offset reflector antenna with large focal to diameter ratio (f/d) in order of 1.1 or larger. However, the design and manufacturing of reflector support structure, shipping, and installation costs of such antennas do not allow the full realization of compactness, and possible cost reductions in the communication system. Prodelin has developed an offset Gregorian reflector antenna with main reflector diameter of 2.4 m, f/d ratio of 0.6, and RF performance which is designed to meet FCC sidelobe specifications, and ASIASAT, and Eutelsat standard-M cross-polarization requirements. This antenna is discussed.","PeriodicalId":283897,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1997. Digest","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127981039","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

Weight optimization method for array-fed reflector antennas used for multibeam satellite communications 卫星多波束通信阵列馈电反射面天线的权重优化方法

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631593

H. Shoki, Y. Suzuki, K. Tokunaga, H. Tsunoda

引用次数: 7

Efficient solution of dense linear system of equations arising in the investigation of electromagnetic scattering by truncated periodic structures 截断周期结构电磁散射研究中密集线性方程组的有效解

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.630084

J. Poirier, P. Borderies, E. Gimonet, R. Mittra, V. Varadarajan

{"title":"Efficient solution of dense linear system of equations arising in the investigation of electromagnetic scattering by truncated periodic structures","authors":"J. Poirier, P. Borderies, E. Gimonet, R. Mittra, V. Varadarajan","doi":"10.1109/APS.1997.630084","DOIUrl":"https://doi.org/10.1109/APS.1997.630084","url":null,"abstract":"The problem of estimating the edge effects in a truncated periodic array is difficult because it requires the solution of a large, dense, linear systems of equations. In this paper we present an efficient numerical technique for solving the problem of one- and two-dimensional truncated array of scatterers. We utilize global impedance matrix compression, achieved by the reduced-rank representation of the off-diagonal blocks, together with partial-QR decomposition. The system with a compressed matrix is then solved by using an iterative method based on preconditioned transpose-free quasi minimal residual (PTFQMR) method, followed by further iterative refinements. Both the preconditioning and the compression steps are configured such that they can take advantage of the block structure of the matrix. A comparative evaluation of the performance of the present iterative technique is carried out vis-a-vis other matrix solution methods, both iterative and direct, with a view to demonstrating the superior computational efficiency of the present solver. We further show that a high matrix compression rate can be achieved without sacrificing the accuracy required by successive refinements. This not only leads to a saving in the memory requirements, and thus enables us to handle large problems which would otherwise be unmanageable, but also contributes to the numerical efficiency of the algorithm.","PeriodicalId":283897,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1997. Digest","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129209581","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: 1

Grid array antennas 栅格阵列天线

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.630129

H. Nakano, T. Kawano

引用次数: 16

Analysis of stub loaded microstrip patch antennas 短段加载微带贴片天线的分析

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631535

M. D. Deshpande, ViGYAN Inc, Research Drive, Hampton M. C. Bailey

{"title":"Analysis of stub loaded microstrip patch antennas","authors":"M. D. Deshpande, ViGYAN Inc, Research Drive, Hampton M. C. Bailey","doi":"10.1109/APS.1997.631535","DOIUrl":"https://doi.org/10.1109/APS.1997.631535","url":null,"abstract":"Rectangular and circular patch antennas loaded with a microstrip stub were previously analyzed using the generalized Thevenin theorem. In the Thevenin theorem approach, the mutual coupling between the patch current and the surface current on the stub was not taken into account. Also, the Thevenin theorem approach neglects continuity of current at the patch-stub junction. The approach presented in this present paper includes the coupling between the patch and stub currents as well as continuity at the patch-stub junction. The input impedance for a stub loaded microstrip patch is calculated by the general planar dielectric dyadic Green's function approach in the spectral domain. Using the spectral domain dyadic Green's function with the electric field integral equation (EFIE), the problem is formulated by using entire domain basis functions to represent the surface current densities on the patch, the loading stub and the attachment mode at the junction. Galerkin's procedure is used to reduce the EFIE to a matrix equation, which is then solved to obtain the amplitudes of the surface currents. These surface currents are then used for calculating the input impedance of stub loaded rectangular and circular stub loaded rectangular and circular microstrip patches. Numerical results are compared with measured results and with previous results calculated by the Thevenin's theorem approach.","PeriodicalId":283897,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1997. Digest","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125423518","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: 12

Line of sight microwave link design. A review of developments and consolidated algorithm 瞄准线微波链路设计。回顾发展和整合算法

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625524

R. Mazzolin, J. Dahele

引用次数: 0

Broadband, high-temperature dielectric properties measurements of thin substrates using open-ended probes 使用开放式探针测量薄基板的宽带、高温介电特性

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625432

S. Bringhurst, M. Iskander, M. White

引用次数: 0