Summary form only given. The use of graphite structure along with gold-plated molybdenum wire mesh surfaces enables the construction of reliable precision spacecraft antennas that can be stowed in a small volume for launch and then deployed on orbit. The basic shape and stability of the deployed antenna are maintained by the graphite ribs and backup structure while the mesh surface provides a high degree of reflectivity in order to prevent excessive RF system losses due to leakage through the reflector surface. For multichannel communications applications, the generation of passive inter-modulation (PIM) components from the nonlinear mixing of transmitted signals can result in interfering signals in band at the spacecraft receiver frequencies. For such applications the additional requirement is imparted that no significant PIM is generated by the reflector surface including the mesh. Practical precision measurement techniques and antenna storage methods are key for the maintenance and evaluation of mesh surface deployable antennas prior to launch to insure proper performance on orbit.<>
{"title":"RF performance of wire mesh used in deployable spacecraft antennas","authors":"G. Turner, W.F. Croswell","doi":"10.1109/APS.1993.385514","DOIUrl":"https://doi.org/10.1109/APS.1993.385514","url":null,"abstract":"Summary form only given. The use of graphite structure along with gold-plated molybdenum wire mesh surfaces enables the construction of reliable precision spacecraft antennas that can be stowed in a small volume for launch and then deployed on orbit. The basic shape and stability of the deployed antenna are maintained by the graphite ribs and backup structure while the mesh surface provides a high degree of reflectivity in order to prevent excessive RF system losses due to leakage through the reflector surface. For multichannel communications applications, the generation of passive inter-modulation (PIM) components from the nonlinear mixing of transmitted signals can result in interfering signals in band at the spacecraft receiver frequencies. For such applications the additional requirement is imparted that no significant PIM is generated by the reflector surface including the mesh. Practical precision measurement techniques and antenna storage methods are key for the maintenance and evaluation of mesh surface deployable antennas prior to launch to insure proper performance on orbit.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128351953","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}
In the analysis of antennas and scatterers of arbitrary shape by the method of moments (MoM), it is desirable to fill the matrix efficiently so that larger size problems can be solved. The authors describe an efficient MoM technique in which the matrix is filled by spatial interpolation of the matrix elements. Redundant calculations in the moment matrix are eliminated by utilizing various symmetries. The method is illustrated by application to planar problems including scattering from a square plate and radiation from a microstrip patch antenna. Computed results compare very well with those in the published literature. Using interpolation to fill the moment matrix has proven to be very efficient and produces negligible error in the computed current distribution.<>
{"title":"Spatial interpolation of the moment matrix in electromagnetic scattering and radiation problems","authors":"T.W. Nuteson, K. Naishadham, R. Mittra","doi":"10.1109/APS.1993.385213","DOIUrl":"https://doi.org/10.1109/APS.1993.385213","url":null,"abstract":"In the analysis of antennas and scatterers of arbitrary shape by the method of moments (MoM), it is desirable to fill the matrix efficiently so that larger size problems can be solved. The authors describe an efficient MoM technique in which the matrix is filled by spatial interpolation of the matrix elements. Redundant calculations in the moment matrix are eliminated by utilizing various symmetries. The method is illustrated by application to planar problems including scattering from a square plate and radiation from a microstrip patch antenna. Computed results compare very well with those in the published literature. Using interpolation to fill the moment matrix has proven to be very efficient and produces negligible error in the computed current distribution.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123996295","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}
A novel radiating element is presented which can provide simultaneously a large bandwidth and high gain. It consists of four identical patches uniformly displayed within a rectangular aperture (2*2), and fed electromagnetically by a driven patch etched on a lower substrate. It is shown that a good coupling with the parasitic patches is obtained, causing a large bandwidth, and that the resonance modes of each patch are excited in phase, giving a high gain. Its structural simplicity and superior performance make this element an attractive candidate for large phase arrays.<>
{"title":"A new stacked microstrip antenna with large bandwidth and high gain","authors":"H. Legay, L. Shafai","doi":"10.1109/APS.1993.385192","DOIUrl":"https://doi.org/10.1109/APS.1993.385192","url":null,"abstract":"A novel radiating element is presented which can provide simultaneously a large bandwidth and high gain. It consists of four identical patches uniformly displayed within a rectangular aperture (2*2), and fed electromagnetically by a driven patch etched on a lower substrate. It is shown that a good coupling with the parasitic patches is obtained, causing a large bandwidth, and that the resonance modes of each patch are excited in phase, giving a high gain. Its structural simplicity and superior performance make this element an attractive candidate for large phase arrays.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123532419","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}
A square spiral placed on a dielectric slab which is backed by a ground plane is analyzed. The spectral domain Green's functions for a current element on a grounded dielectric slab are used to develop an integral equation which is solved by the method of moments. In this formulation, the effects of the dielectric material are rigorously modeled. The current density on one arm of the square microstrip spiral at 6.0 GHz is shown as a function of subdomain number and compares favorably to the results found in H. Nakano et al. (1986) for the Archimedean spiral. The gain, axial ratio, and input impedance of the square microstrip spiral are shown as functions of frequency and also compare favorably to the results for the Archimedean spiral.<>
分析了以接地面为背的介电板上的方形螺旋。利用介电接地板上电流单元的谱域格林函数，建立了用矩量法求解的积分方程。在这个公式中，电介质材料的影响是严格模拟的。6.0 GHz方形微带螺旋单臂上的电流密度显示为子域数的函数，与H. Nakano et al.(1986)在阿基米德螺旋上发现的结果比较有利。方形微带螺旋的增益、轴比和输入阻抗显示为频率的函数，并且与阿基米德螺旋的结果相比较也很好。
{"title":"Spectral domain analysis of square spiral microstrip antennas","authors":"D. Shively","doi":"10.1109/APS.1993.385471","DOIUrl":"https://doi.org/10.1109/APS.1993.385471","url":null,"abstract":"A square spiral placed on a dielectric slab which is backed by a ground plane is analyzed. The spectral domain Green's functions for a current element on a grounded dielectric slab are used to develop an integral equation which is solved by the method of moments. In this formulation, the effects of the dielectric material are rigorously modeled. The current density on one arm of the square microstrip spiral at 6.0 GHz is shown as a function of subdomain number and compares favorably to the results found in H. Nakano et al. (1986) for the Archimedean spiral. The gain, axial ratio, and input impedance of the square microstrip spiral are shown as functions of frequency and also compare favorably to the results for the Archimedean spiral.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"44 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123657539","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}
Y. Yamaguchi, S. Egashira, A. Sakitani, E. Nishiyama
A numerical analysis of the gain characteristics and radiation patterns of a circular patch microstrip antenna with a dielectric element is presented. Numerical results are found to be in a good agreement with experimental data. It is confirmed that Hankel domain analysis is an effective method.<>
{"title":"Numerical analysis of circular patch microstrip antenna with a dielectric element","authors":"Y. Yamaguchi, S. Egashira, A. Sakitani, E. Nishiyama","doi":"10.1109/APS.1993.385469","DOIUrl":"https://doi.org/10.1109/APS.1993.385469","url":null,"abstract":"A numerical analysis of the gain characteristics and radiation patterns of a circular patch microstrip antenna with a dielectric element is presented. Numerical results are found to be in a good agreement with experimental data. It is confirmed that Hankel domain analysis is an effective method.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121396004","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}
A novel design method is proposed with which difference patterns and their aperture distributions can be deduced from Taylor distributions. The peak sidelobe level in the difference pattern can be easily controlled. A formula for evaluating the sidelobe level of the difference pattern is given in which two parameters, the number of elements and the sidelobe level of the Taylor distribution, are included. The sidelobe level for the Taylor distribution is calculated to give the sidelobe level for the desired difference pattern.<>
{"title":"Design of aperture distributions for difference pattern from Taylor distributions","authors":"G. Yanchang, M. Meng, S. Xianrong, F. Nenghang","doi":"10.1109/APS.1993.385500","DOIUrl":"https://doi.org/10.1109/APS.1993.385500","url":null,"abstract":"A novel design method is proposed with which difference patterns and their aperture distributions can be deduced from Taylor distributions. The peak sidelobe level in the difference pattern can be easily controlled. A formula for evaluating the sidelobe level of the difference pattern is given in which two parameters, the number of elements and the sidelobe level of the Taylor distribution, are included. The sidelobe level for the Taylor distribution is calculated to give the sidelobe level for the desired difference pattern.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124133632","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}
The authors investigate a solution for the scattering of an obliquely incident wave by a two-layer nonconfocal dielectric elliptical cylinder. The scattering of the E and H wave incidence cases is considered. The scattering wave equations are given in terms of radial and angular Mathieu functions.<>
{"title":"Electromagnetic wave scattering by a two layer nonconfocal elliptical dielectric cylinder","authors":"J. Ge, W. Lin","doi":"10.1109/APS.1993.385195","DOIUrl":"https://doi.org/10.1109/APS.1993.385195","url":null,"abstract":"The authors investigate a solution for the scattering of an obliquely incident wave by a two-layer nonconfocal dielectric elliptical cylinder. The scattering of the E and H wave incidence cases is considered. The scattering wave equations are given in terms of radial and angular Mathieu functions.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127774981","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}
A cheap alternative to the swan-neck feed, which can obtain low sidelobes even without an absorbing cylinder is presented. This feed is called the rectangular hat feed. The ideas of soft and hard surfaces have been used to optimize the performance of this linearly polarized feed. It can give low sidelobes and has broader bandwidth than the circular hat feed.<>
{"title":"An efficient rectangular hat feed for linear polarization and low sidelobes","authors":"A. Moldsvor, M. Raberger, P. Kildal","doi":"10.1109/APS.1993.385352","DOIUrl":"https://doi.org/10.1109/APS.1993.385352","url":null,"abstract":"A cheap alternative to the swan-neck feed, which can obtain low sidelobes even without an absorbing cylinder is presented. This feed is called the rectangular hat feed. The ideas of soft and hard surfaces have been used to optimize the performance of this linearly polarized feed. It can give low sidelobes and has broader bandwidth than the circular hat feed.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128009046","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}
The authors present a unified approach to the analysis of ridged waveguides by a magnetic field integral equation (MFIE) formulation. The MFIE approach allows an accurate and complete solution via a simple numerical implementation of pulse basis functions. The emphasis in the present work is on the design of ridged waveguides for applications in microwave components and systems, rather than on details of numerical algorithms. The proposed theory is verified by comparison with exact closed-form solutions and other published results.<>
{"title":"Analysis of double- or quadruple-ridged waveguides by a magnetic surface integral equation approach","authors":"WaiChing Sun, C. Balanis","doi":"10.1109/APS.1993.385373","DOIUrl":"https://doi.org/10.1109/APS.1993.385373","url":null,"abstract":"The authors present a unified approach to the analysis of ridged waveguides by a magnetic field integral equation (MFIE) formulation. The MFIE approach allows an accurate and complete solution via a simple numerical implementation of pulse basis functions. The emphasis in the present work is on the design of ridged waveguides for applications in microwave components and systems, rather than on details of numerical algorithms. The proposed theory is verified by comparison with exact closed-form solutions and other published results.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128058576","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}
A novel method for the diagnosis and localization of defective elements of feed network branches in large phased array antennas has been proposed and experimentally validated. A passive microwave comparer circuit is introduced which can be permanently integrated, in large numbers, in the phased array and will then be able to perform the functions of fault diagnostic and defective element localization. To validate the feasibility of the proposed technique, the complex ratio of two independent signals exciting two loads with the aid of a comparer circuit was measured.<>
{"title":"Automatic diagnostic and localization of defective elements in phased array antennas","authors":"F. Ghannouchi, A. Kouki, A. Khebir","doi":"10.1109/APS.1993.385366","DOIUrl":"https://doi.org/10.1109/APS.1993.385366","url":null,"abstract":"A novel method for the diagnosis and localization of defective elements of feed network branches in large phased array antennas has been proposed and experimentally validated. A passive microwave comparer circuit is introduced which can be permanently integrated, in large numbers, in the phased array and will then be able to perform the functions of fault diagnostic and defective element localization. To validate the feasibility of the proposed technique, the complex ratio of two independent signals exciting two loads with the aid of a comparer circuit was measured.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128071716","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}
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