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1998 Symposium on Antenna Technology and Applied Electromagnetics最新文献

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Phase and amplitude anomalies in uniform microstrip arrays 均匀微带阵列的相位和振幅异常
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861667
A. Badawi, D. Gray, C. Ravipati, L. Shafai
{"title":"Phase and amplitude anomalies in uniform microstrip arrays","authors":"A. Badawi, D. Gray, C. Ravipati, L. Shafai","doi":"10.1109/ANTEM.1998.7861667","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861667","url":null,"abstract":"The design process of a corporate-fed microstrip patch antenna array relies on the aperture theory, and microstrip circuits design equations. Such an approach usually neglects mutual coupling between array elements, which is known to degrade the array performance. The design of the individual antenna elements can be a straight forward process for canonical shapes on single layer substrates. On the other hand, the design of the feed network is much more sensitive. Line losses and radiation from the feed network can affect the overall performance of the array both in the co-polar and cross-polar radiation patterns [1]. It was also shown that symmetry in the feed network should be maintained to avoid excessive cross-polarization radiation [2].","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"127 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120818357","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
Membrane lens antennas with electromagnetically-coupled layers 具有电磁耦合层的膜透镜天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861794
P. Wood
{"title":"Membrane lens antennas with electromagnetically-coupled layers","authors":"P. Wood","doi":"10.1109/ANTEM.1998.7861794","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861794","url":null,"abstract":"Many spacecraft applications call for a deployable antenna which is capable of generating a fairly narrow beam, and which can be realised with an inexpensive, low mass construction. The membrane lens antenna [1] is well suited to applications of this type. Thus, when an antenna aperture is fabricated on one or more planar membranes, a very light-weight structure results. Furthermore, a simple mechanism such as an assembly of telescoping tubes can be introduced to provide deployment [2]. The folded lens assembly can be stowed in a small canister. Deployment is achieved by tensioning wires which emanate from the membrane corners, the outer membrane edges then taking on catenary shapes.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127384310","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
Two-dimensional equations for microwave planar circuits 微波平面电路的二维方程
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861789
A. Ţugulea, I. Ciric
{"title":"Two-dimensional equations for microwave planar circuits","authors":"A. Ţugulea, I. Ciric","doi":"10.1109/ANTEM.1998.7861789","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861789","url":null,"abstract":"A planar circuit [1] is defined as an electric circuit having dimensions comparable to the wavelength in two directions but a much smaller dimension in the third direction. Microwave integrated circuits, which have replaced the conventional microwave circuits [2], are constructed in a planar form. The transmission structures contain striplines, the most used being the microstrips. The two-dimensional equations for the microwave planar circuits, first presented in [3], were derived by considering a quasistationary TEM mode as the fundamental mode of propagation. In this paper we show that these equations can be employed for analyzing not only the fundamental mode but also the higher-order modes of propagation. Indeed, for a rectangular waveguide model with hybrid electric and magnetic walls [4], [5] the higher-order TE modes are identical with those derived from the two-dimensional equations for lossless circuits. This suggests the possibility of applying the two-dimensional equations for lossy planar circuits [3] to analyze the propagation of higher-order TE modes along lossy structures, for which there are only crude models available in the literature.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125288482","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
“A multiple beam shaped reflector antenna” 一种多波束形反射天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861775
T. Smith
{"title":"“A multiple beam shaped reflector antenna”","authors":"T. Smith","doi":"10.1109/ANTEM.1998.7861775","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861775","url":null,"abstract":"Shaped reflector antennas have become the standard for communication satellite antenna applications for more than five years. Another trend which is becoming evident is the requirement to provide higher power on the satellites. This requires that more beams be provided by the antenna system to make effective use of this increased power. In order to do this, more apertures, or more beams per aperture, are needed. This paper details the design of an antenna system which makes use of the high efficiency characteristics of shaped reflector antennas and provides additional beams within a common aperture, isolated from the other coverage beams, by use of multiple feed horns. The design methodology is to shape the reflector for the most important coverage beam to provide maximum efficiency. For one or more peripheral beams, multiple element feeds are used to cover the desired secondary region(s), and the coefficients of the feeds are optimized to provide sidelobe isolation in the direction of the other beams. This paper will discuss the design considerations and performance achieved for a multiple beam antenna which uses the best features of shaped reflector antennas and those of multiple feed reflector antennas. The virtues of this design fit well with the new requirements for high power satellites with many isolated coverage regions, employing multiple frequency reuses by polarization diversity and spatial diversity.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114862995","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
X-band microstrip array antenna with integrated radome 带集成天线罩的x波段微带阵列天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861683
E. Charpentier, Y. Cassivi, Minh Diem Le Thi
{"title":"X-band microstrip array antenna with integrated radome","authors":"E. Charpentier, Y. Cassivi, Minh Diem Le Thi","doi":"10.1109/ANTEM.1998.7861683","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861683","url":null,"abstract":"An array antenna with an integrated radome, consisting of microstrip elements with a flat radome cover layer is introduced. The effects of a flat radome layer on the microstrip array antenna at X-band frequencies are examined. The presence of a dielectric radome layer above the radiating elements influences the antenna properties such as the gain, radiation pattern, input impedance and resonant frequency. Using CAD software, simulation results have demonstrated that the integrated radome is similar to an RF lens and can enhance the directivity in the broadside direction. Detailed characteristics of the 2×2 array antenna have been analyzed for two different radome thickness. Antenna simulation and experimental results are discussed.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117172772","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
An improvement in the approximation of basic curve μ=μ(h) using spline functions 用样条函数逼近基本曲线μ=μ(h)的改进
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861664
C. Akyel, S. Babic
{"title":"An improvement in the approximation of basic curve μ=μ(h) using spline functions","authors":"C. Akyel, S. Babic","doi":"10.1109/ANTEM.1998.7861664","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861664","url":null,"abstract":"This paper deals with a very efficient method in building the magnetic permeability curve using the cubic spline function C(2). We first approximate the basic curve of magnetization B = B(H) using spline function [1] and [3]. From this function we can find the first derivatives analytically. It is also possible to determine the maximum value of magnetic permeability [2]. Having all necessary information about B = B(H) and μmax we can deduce the derivative curve namely B' = B'(H) and also obtain the first derivative at the beginning and at the end of the curve μ = μ(H).","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115170574","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
Design and measured performance of advanced Satcom dielectric lens antenna 新型卫星通信介质透镜天线的设计与性能测量
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861707
M. Gimersky, J. Uher, K. Chan
{"title":"Design and measured performance of advanced Satcom dielectric lens antenna","authors":"M. Gimersky, J. Uher, K. Chan","doi":"10.1109/ANTEM.1998.7861707","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861707","url":null,"abstract":"This paper describes design techniques and presents calculated as well as experimental performance of a multiple-beam dielectric lens antenna for the Ka-band Advanced Satcom application. The lens is spherical on the outside and zoned on the inner surface. A dual-CP, single-horn-per-beam mode of operation is assumed. In order to examine mutual-coupling effects, however, a 19-element feed cluster, with only one element active, was built and tested. Primary and secondary radiation patterns are presented. Superior electrical performance of the lens and excellent agreement of experimental and predicted results are demonstrated.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115492615","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
Response of various targets to RF pulses 各种目标对射频脉冲的响应
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861727
S. Kashyap, C. Gardner, A. Louie
{"title":"Response of various targets to RF pulses","authors":"S. Kashyap, C. Gardner, A. Louie","doi":"10.1109/ANTEM.1998.7861727","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861727","url":null,"abstract":"This paper investigates the electromagnetic response of various targets, including dipoles, monopoles, cavities and transmission lines to an RF pulse. We use both frequency-domain and time-domain simulation codes to compute the pulse response of various targets. We consider the response to pulses as short as 10–15 cycles of a sinusoidal signal, and investigate the early time and late time behaviour of the time domain response.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124829769","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
Effect of parasitic patch on the bandwidth characteristics of U-slot rectangular microstrip antenna 寄生贴片对u型槽矩形微带天线带宽特性的影响
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861689
M. Clénet, C. Ravipati, L. Shafai
{"title":"Effect of parasitic patch on the bandwidth characteristics of U-slot rectangular microstrip antenna","authors":"M. Clénet, C. Ravipati, L. Shafai","doi":"10.1109/ANTEM.1998.7861689","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861689","url":null,"abstract":"Since the early 80's, microstrip antennas have received much attention because of their low cost, thin profile and light weight, conformability on curved surface and compatibility with integrated circuitry. However, they suffer from narrow impedance bandwidth. To overcome this drawback, a well known concept is used, which is based on coupling a parasitic patch on the same layer or on another layer, so that bandwidth of around 20% could be obtained. Recently, it has been shown that impedance bandwidth over 30% can be achieved using a single layer probe fed patch antenna loaded with a U-slot [1].","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129871126","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: 8
Arrays of dipoles around vertical cylindrical supports — Analysis and design using PC 垂直圆柱支撑周围的偶极子阵列。用PC机分析和设计
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861739
M. Mikavica
{"title":"Arrays of dipoles around vertical cylindrical supports — Analysis and design using PC","authors":"M. Mikavica","doi":"10.1109/ANTEM.1998.7861739","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861739","url":null,"abstract":"A computer program which evaluates the radiation patterns for the arrays of horizontal and vertical dipoles arbitrarily arranged in one or more subarrays around cylindrical supports, taking into account the effect of the support, is presented in the paper. The program is based on the rigorous solution of Maxwell's equations for a dipole near a long cylinder. Several examples of program execution are given to illustrate some of the program capabilities.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121389917","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
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