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1998 Symposium on Antenna Technology and Applied Electromagnetics最新文献

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Accelerative technique for projection iterative method and its application on 3-dimensional scattering problems 投影迭代法的加速技术及其在三维散射问题中的应用
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861798
Q. Ye, L. Shafai
{"title":"Accelerative technique for projection iterative method and its application on 3-dimensional scattering problems","authors":"Q. Ye, L. Shafai","doi":"10.1109/ANTEM.1998.7861798","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861798","url":null,"abstract":"Numerical solutions for electromagnetic integral equations describing scattering from electrically large complex objects continues to be a challenging problem. The classical method of moments (MoM) reduces the integral equations to matrix equations and produces dense linear systems. Since direct solvers for dense systems are impractical for large matrices, iterative methods are usually used. Among various iterative methods, a projection iterative method (PIM) [1] is proven to be convergent as long as MoM coefficient matrix is non-singular. The PIM formulation, its acceleration techniques, and a computed example of dipole array are presented in [1]. PIM is not widely introduced in applied electromagnetics and is worth further investigation.","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":"123843883","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
Design and implementation of the Koreasat-3 Ka-band FSS antenna Koreasat-3 ka波段FSS天线的设计与实现
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861676
J. Boshouwers, M. Gimersky, C. Grenier, D. Poulin, S. Riendeau, J. Uher
{"title":"Design and implementation of the Koreasat-3 Ka-band FSS antenna","authors":"J. Boshouwers, M. Gimersky, C. Grenier, D. Poulin, S. Riendeau, J. Uher","doi":"10.1109/ANTEM.1998.7861676","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861676","url":null,"abstract":"The Ka-band antenna subsystem discussed in this paper forms a part of an active-repeater communications spacecraft for use in geosynchronous, circular, equatorial orbit for the Korean domestic service. The antenna is a Gregorian-type configuration with a shaped main reflector fed by a circularly polarized feed and it is used for transmission and reception. The paper first presents the antenna main performance requirements and the description of the design. They are followed by a description of the key implementation issues. Finally, feed breadboard results and antenna performance predictions derived from the feed results are presented.","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":"123891315","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
Load effect analysis of circular cilindrical cavity using 3-D TLM method 基于三维TLM方法的圆柱腔载荷效应分析
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861741
B. Milovanovic, N. Dončov, S. Ivkovic, V. Stanković
{"title":"Load effect analysis of circular cilindrical cavity using 3-D TLM method","authors":"B. Milovanovic, N. Dončov, S. Ivkovic, V. Stanković","doi":"10.1109/ANTEM.1998.7861741","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861741","url":null,"abstract":"Cylindrical metallic cavity with circular cross-section loaded by lossy dielectric sample is analyzed using the Transmission-Line Modeling (TLM) method. For modeling purpose, a hybrid symmetrical condensed node (HSCN) in cylindrical coordinates, implemented in an appropriate software, is applied. The case when lossy dielectric sample is located on the bottom of the cavity is considered and the resonant frequencies versus filling factor are presented for the TM01ℓ mode. Also, numerical and experimental analysis of the resonant cavity loaded by lossy dielectric sample sloped in regard to cavity base (inhomogeneous in r and θ direction) is done in this paper.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"2 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":"114358173","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
Active dual band dual polarized microstrip array panel 有源双频双极化微带阵列面板
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861752
T. Pellerin, G. Séguin, G. Brassard
{"title":"Active dual band dual polarized microstrip array panel","authors":"T. Pellerin, G. Séguin, G. Brassard","doi":"10.1109/ANTEM.1998.7861752","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861752","url":null,"abstract":"A dual-band array has the potential of increasing the information content of spaceborne SAR systems. Recent studies show that the combination of L & C band frequencies provides improved characterization data Ref.[1]. The Canadian Space Agency is undertaking a project for the development of new integration and on-board calibration techniques for a dual band active array. The integration approach consists of a light multilayer panel using microstrip radiating elements at L & C bands, together with RF feed network layers, a DC distribution layer, control signal distributions layer and feed network layers for the T/R modules. These layers are integrated together on a single panel, using a lightweight, temperature stable mechanical support. The use of two independent RF distribution networks to support dual polarization, also allows for an on-board calibration technique, which will significantly reduce the alignment testing time and increase the beam accuracy. The final configuration will be tested in a near-field test range in pulse mode. This new technique of integration of all the signal distributions on a multilayer microstrip active array SAR antenna will also improve reliability by reducing the amount of cabling.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"105 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":"124059825","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
Modeling of an infinite line source in FDTD 时域有限差分法中无限线源的建模
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861754
M. Potter, M. Stuchly, M. Okoniewski
{"title":"Modeling of an infinite line source in FDTD","authors":"M. Potter, M. Stuchly, M. Okoniewski","doi":"10.1109/ANTEM.1998.7861754","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861754","url":null,"abstract":"Since its introduction by Yee [1], the FDTD method has been used extensively to model electromagnetic field interactions with complex heterogeneous bodies. A multitude of source functions for complex source geometries have also been successfully developed over the past 30 years. A major step forward in helping to develop these source functions was the introduction of the total/scattered field formulation by Taflove [2]. The importance of this work was that it allowed algorithms to efficiently implement uniform plane wave sources from arbitrary directions in FDTD. This is particularly important for modeling problems where both the total and scattered fields are of interest.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"9 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":"126394972","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
Design of broadband multi-stage microwave amplifiers using analytical approach 用解析法设计宽带多级微波放大器
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861785
F. Tavakkol-Hamedani
{"title":"Design of broadband multi-stage microwave amplifiers using analytical approach","authors":"F. Tavakkol-Hamedani","doi":"10.1109/ANTEM.1998.7861785","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861785","url":null,"abstract":"New, general and simple formulas for designing of input, output and interstage matching networks and constraints on the gain-bandwidth limitations of broadband multistage microwave amplifiers are given. Using this approach, a broadband three-stage microwave amplifier is designed and the results are shown.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"14 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":"127955554","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
Ka-band antenna development for LMCS applications 用于LMCS应用的ka波段天线开发
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861768
L. Shafai, D. Gray, C. Ravipati, M. Barakat, S. Raut, N. Jacobs
{"title":"Ka-band antenna development for LMCS applications","authors":"L. Shafai, D. Gray, C. Ravipati, M. Barakat, S. Raut, N. Jacobs","doi":"10.1109/ANTEM.1998.7861768","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861768","url":null,"abstract":"Local multi-point communication services, LMCS, is targeted for operation around 28 GHz with an initial bandwidth of 1 GHz. Different service scenarios are under investigation, and a preliminary multi-cell configuration assumes four transmitters per site alternating between vertical and horizontal polarizations. The beam widths will, of course, depend on the cell configuration and for the above four sector case will be 90 degrees, limiting the antenna gain. The receiver antenna, at subscriber site, should therefore have higher gains, to compensate for the path loss and attenuations due to foliage, humidity, and multiple reflections. The latter also causes multipath interference, that must be eliminated or reduced to improve the coverage. A convenient approach will be to use narrow beam receiver antennas to block the multipath signals. This, in turn, again results in higher gain receiver antennas. In principle, therefore, the subscriber antennas are expected to be high gain and simultaneously low cost to increase the subscription rate.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"22 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":"133636274","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
Combined square-circular microstrip antenna 组合方圆微带天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861700
N. Fayyaz, S. Safavi-Naeini
{"title":"Combined square-circular microstrip antenna","authors":"N. Fayyaz, S. Safavi-Naeini","doi":"10.1109/ANTEM.1998.7861700","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861700","url":null,"abstract":"A novel microstrip antenna is presented. This antenna combines a circular patch and square patch such that the resonant frequency of the new design lies between the theoretical resonant frequencies for the circular and square antennas. The polarization of the new antenna is linear, and its radiation pattern has the same general characteristics as the square and circular microstrip antennas.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"98 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":"115789051","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 38 GHz integrated phased-array antennas for PCS 一种用于pc机的38ghz集成相控阵天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861715
K. Hettak, G. Delisle
{"title":"A 38 GHz integrated phased-array antennas for PCS","authors":"K. Hettak, G. Delisle","doi":"10.1109/ANTEM.1998.7861715","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861715","url":null,"abstract":"Plans for future broadband personal communication systems urge the development of alternatives types of antennas that are small, light and cheap enough to be affordable to millions people. Our paper presents therefore an effort in the development of novel printed phased array antenna fed by CPW configuration to generate a dual polarization with a CPW feed line on single layer for the EHF band around a center frequency of 38 GHz. The array struture conjugates the advantages of aperture-coupled microstrip antenna and the wide range of flexibility and scope for innovation that uniplanar technology offers. Thus simplifies the structure of the array antenna by reducing the number of metallization level, from 3 down to 2, thereby making easier the integration of the active devices. In addition, this type of coupling is advantageous when applied to millimeter wave monolithic phased arrays. A unique feed design eliminates the competition for surface space between the antenna elements and the feed network. In addition, the ground plane shields the antenna half-space from spurious radiation emitted by feed lines and active devices. The array antenna is designed on a high dielectric constant substrate (εr = 9.9), which is close to the dielectric constant of GaAs and demonstrates the feasibility of integration of such an antenna structure into monolithic circuits. Finally, the newly developed array antenna provide alternative yet compact structures and should be useful in multitude of applications such wide-band digital indoor communication systems using MMICs on the same substrate and a combination of optical and radio transmission.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"15 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":"124298069","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 30 GHz CPW fed microstrip array for personal communications 用于个人通信的30ghz CPW馈电微带阵列
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861677
M. Boulmalf, G. Delisle
{"title":"A 30 GHz CPW fed microstrip array for personal communications","authors":"M. Boulmalf, G. Delisle","doi":"10.1109/ANTEM.1998.7861677","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861677","url":null,"abstract":"Plans for future broadband communication systems call for the development of alternatives types of antennas. A combination of slot and microstrip patch antenna lead to particularly convenient geometries. Recently, the coplanar waveguide (CPW) appeared as an alternative solution for antenna feeding and a CPW microstrip patch antenna has become interesting. This paper proposes a design procedure of CPW aperture coupled patch antenna at 30 GHz, implemented on a high dielectric constant substrate (∊r = 9.9), which is close to the dielectric constant of GaAs.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"8 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":"123631759","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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