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1988 IEEE AP-S. International Symposium, Antennas and Propagation最新文献

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Factors influencing sidelobes on copol patterns of centre fed dual reflector earth station antennas 中心馈电双反射面地面站天线冷态图旁瓣的影响因素
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94213
V. Minassian
{"title":"Factors influencing sidelobes on copol patterns of centre fed dual reflector earth station antennas","authors":"V. Minassian","doi":"10.1109/APS.1988.94213","DOIUrl":"https://doi.org/10.1109/APS.1988.94213","url":null,"abstract":"Various factors which have on influence in increasing the sidelobe levels in symmetrical Cassegrain antennas are highlighted. Also shown are computed and measured values of copol patterns for a 40-ft. Cassegrain antenna. A geometric optic synthesis method was adapted to shape the profile of this dual-reflector system.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122928959","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
Electromagnetically coupled feed network for an array module of four microstrip elements 四微带元件阵列模块的电磁耦合馈电网络
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94261
R.Q. Lee, R. N. Simons
{"title":"Electromagnetically coupled feed network for an array module of four microstrip elements","authors":"R.Q. Lee, R. N. Simons","doi":"10.1109/APS.1988.94261","DOIUrl":"https://doi.org/10.1109/APS.1988.94261","url":null,"abstract":"A novel feeding configuration for an array module of four microstrip elements using electromagnetic coupling of coplanar waveguides (CPWs) has been investigated. Experimental results indicate an acceptable level of coupling loss at the CPW nonplanar T-junction and also excellent radiation patterns. The approach requires no direct solder contact and therefore offers the possibility of high-level integration in large phased-array designs.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131144772","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
Electromagnetic imaging of complex permittivity profiles by moment method in the spectral domain 复介电常数谱域矩量法电磁成像
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94196
S. Kim, J.-M. Lee, J. Ra
{"title":"Electromagnetic imaging of complex permittivity profiles by moment method in the spectral domain","authors":"S. Kim, J.-M. Lee, J. Ra","doi":"10.1109/APS.1988.94196","DOIUrl":"https://doi.org/10.1109/APS.1988.94196","url":null,"abstract":"A novel inverse scheme applicable in the spectral domain is suggested to find a proper way to remedy the ill-posedness inherent to inverse scattering problems. A cylindrical object with complex relative dielectric constant in arbitrary cross section S is treated. Numerical simulation results are discussed.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131102696","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
A discussion of E-pulse method and Prony's method for radar target resonance retrieval from scattered field 散射场雷达目标共振反演的e脉冲法和普罗尼法的探讨
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94161
Y. Hua, T. Sarkar
{"title":"A discussion of E-pulse method and Prony's method for radar target resonance retrieval from scattered field","authors":"Y. Hua, T. Sarkar","doi":"10.1109/APS.1988.94161","DOIUrl":"https://doi.org/10.1109/APS.1988.94161","url":null,"abstract":"The E-pulse method is discussed and refined in the context of radar target pole retrieval from scattered field. Its relation to Prony's method is investigated. It is shown that the E-pulse method can be viewed as a smoothing and sampling procedure and a Prony's approach. The tradeoff between noise insensitivity and computation burden influenced by various parameters is pointed out.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116528018","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: 23
A hybrid method for the calculation of transient EM scattering 一种计算瞬态电磁散射的混合方法
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94001
L. Zhang, P. Wang, W. Wang
{"title":"A hybrid method for the calculation of transient EM scattering","authors":"L. Zhang, P. Wang, W. Wang","doi":"10.1109/APS.1988.94001","DOIUrl":"https://doi.org/10.1109/APS.1988.94001","url":null,"abstract":"Analytical and numerical studies have made clear that singularity expansion methods (SEMs) for scattering responses are inadequate in early scattering time. However, it is efficient to use SEM in later scattering time, especially after creeping waves reach the observation point. A combination of a discrete Fourier transformation (DFT-SEM) and an SEM expansion is reported that gives good results in the entire time domain. The method avoids the difficulties of SEM in calculation of early time responses and is more efficient and exact than the DFT method alone. Because contributions to the response are considered over all the frequency domain, there is no restriction on the excitation, it can be an impulse that has a white spectrum. The solutions given by the DFT-SEM method have high precision and are insensitive to frequency-response errors.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128028521","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
Efficient current expansions modes for N-arm frequency selective surface elements n臂频率选择表面元件的高效电流展开模式
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94190
R. G. Smith, L. Riggs
{"title":"Efficient current expansions modes for N-arm frequency selective surface elements","authors":"R. G. Smith, L. Riggs","doi":"10.1109/APS.1988.94190","DOIUrl":"https://doi.org/10.1109/APS.1988.94190","url":null,"abstract":"An entire domain current expansion set is found for the tripole frequency-selective surface (FSS) using the singularity expansion method (SEM). The SEM analysis is performed on a thin wire model of an isolated FSS element. The SEM natural current modes yield a highly efficient entire domain expansion set for use in a Floquet moment-method analysis of the FSS array. The SEM analysis yields an optimum set of expansions functions without any prior knowledge about the FSS element.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134530846","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
The relationship between dispersion loss, sidelobe levels, and bandwidth in wideband radars with subarrayed antennas 带子阵列天线的宽带雷达中色散损耗、旁瓣电平和带宽之间的关系
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94023
R. Howard, L. Corey, S. P. Williams
{"title":"The relationship between dispersion loss, sidelobe levels, and bandwidth in wideband radars with subarrayed antennas","authors":"R. Howard, L. Corey, S. P. Williams","doi":"10.1109/APS.1988.94023","DOIUrl":"https://doi.org/10.1109/APS.1988.94023","url":null,"abstract":"The effects of wideband linear frequency modulated (LFM) signal processing in phased-array radars are discussed for a phased-array antenna with subarrays. In addition to the performance issues of dispersion loss and compressed pulse widths associated with wideband phased arrays, subarrayed architectures add the problem of wideband sidelobes, or subarray grating lobes. The authors address the relationships between these three performance parameters and the effect that three different spectral filtering techniques have on them. Three filtering scenes are studied: a matching filter, a matching filter following by a weighting filter in combination, and a weighting filter with Taylor distributed weights.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133386305","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
Low mutual coupling between orthogonal slots and patches arrays 正交槽和贴片阵列之间的互耦性低
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94243
J. Daniel, A. Sharaiha, C. Terret, E. Penard, S. Meyer, J. Leost
{"title":"Low mutual coupling between orthogonal slots and patches arrays","authors":"J. Daniel, A. Sharaiha, C. Terret, E. Penard, S. Meyer, J. Leost","doi":"10.1109/APS.1988.94243","DOIUrl":"https://doi.org/10.1109/APS.1988.94243","url":null,"abstract":"A planar printed array of two patches and two slots is analyzed and tested. The microstrip array is considered as four parallel slots, each equally excited with a uniform field distributed via transmission line sections (low and high characteristic impedances). The slots are resonant (half-wavelength). The radiating structure can be considered as a six-port network completely defined by the 6*6 admittance matrix. It is shown that coupling lower than -40 dB can be achieved, and position sensitivity results are given.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130377688","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
Rough surface scattering. I. Electromagnetic scattering and shadowing from an exponentially distributed rough surface 粗糙的表面散射。1 .指数分布粗糙表面的电磁散射和阴影
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94231
V.P. Pyati, T. K. Roseman, C. E. Reif
{"title":"Rough surface scattering. I. Electromagnetic scattering and shadowing from an exponentially distributed rough surface","authors":"V.P. Pyati, T. K. Roseman, C. E. Reif","doi":"10.1109/APS.1988.94231","DOIUrl":"https://doi.org/10.1109/APS.1988.94231","url":null,"abstract":"For the purposes of rough surface scattering analysis it is often desirable to model the rough surface by a joint probability density function (JPDF). To date a considerable amount of work in this area has been done using a Gaussian and an exponential-type JPDF. Unlike the Gaussian JPDF, the exponential-type JPDF fails to meet the requirement that the random variables (which represent surface heights) become independent when uncorrelated. An exponential JPDF which splits into the product two sided exponential PDFs has been derived by applying certain nonlinear transformation to the square of the envelope and the phase of a narrowband Gaussian random process. The application of this JPDF is presented.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124407339","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
The transmission line matrix method applied to microstrip antennas 传输线矩阵法在微带天线中的应用
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94262
O. Messaoudi, O. Benevello, D. Pompei, A. Papiernik
{"title":"The transmission line matrix method applied to microstrip antennas","authors":"O. Messaoudi, O. Benevello, D. Pompei, A. Papiernik","doi":"10.1109/APS.1988.94262","DOIUrl":"https://doi.org/10.1109/APS.1988.94262","url":null,"abstract":"The transmission-line matrix (TLM) method combines Maxwell's equations and propagation equations in transmission lines forming a three-dimensional network with uniform or nonuniform mesh. It simulates wave propagation in bounded space, describing the transient response at each point. Application of the principle of causality or introduction of absorbent wells allows the extension of the TLM method to open structures. The method was tested on linear wire antennas and then successfully applied to microstrip antennas. Despite the relatively cumbersome numerical computation involved, the method is quite advantageous for complex geometries (limitation of the ground plane or substrate, excitation by slots, or coupling).<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115801210","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
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