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

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A waveguide fed composite horn antenna 波导馈电复合喇叭天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94065
W. Crosswell, R. Roddewig, C. G. Pewsey, R. Moye, W. L. Jones
{"title":"A waveguide fed composite horn antenna","authors":"W. Crosswell, R. Roddewig, C. G. Pewsey, R. Moye, W. L. Jones","doi":"10.1109/APS.1988.94065","DOIUrl":"https://doi.org/10.1109/APS.1988.94065","url":null,"abstract":"The design, development, and testing of a dual-polarized waveguide-fed horn antenna is highlighted. The antenna is to be used for the wind scatterometer radar, NSCAT, to be placed upon the NROSS satellite. The dual polarized NSCAT antenna consists of a pair of slotted waveguides fed through horns. The edge-wall 202-element slot array excites an H-plane flared horn; the broad-wall 202-element slot array excites a corrugated E-plane flared horn. The antennas are designed to have nearly identical far-field patterns. It is noted that careful attention to all construction tolerances was extremely important for maintaining proper beam pointing and scale lobe levels. This was particularly true for the edge-wall slot design.<<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":"130786619","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
A C-band digital beamforming array 一种c波段数字波束形成阵列
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94360
L. Simonangeli, A. Agrawal
{"title":"A C-band digital beamforming array","authors":"L. Simonangeli, A. Agrawal","doi":"10.1109/APS.1988.94360","DOIUrl":"https://doi.org/10.1109/APS.1988.94360","url":null,"abstract":"A 32-element C-band digital beamforming (DBF) array which serves as a testbed for algorithm development and demonstration of digital beamforming technology is presented. Cost reduction, primarily in the areas of receiver modules, I/Q generation, and array alignment/calibration, was an overall consideration. Individual components of the beamforming system are discussed. Topics covered include receiver modules, I/Q generation, calibration/array alignment, and the technique used for monitoring quality and integrity of digitized array data. The subject of system drift is addressed by comparing single-source receive patterns taken at various times. RF isolation is demonstrated using IF spectral plots computed from digitized receiver module data. In addition, single-source receive patterns for various arrival angles are presented. The experimental data is used to illustrate the performance of a DBF array in two rather important application areas, namely, spatial analysis for source detection and localization and adaptive nulling.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"13 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":"131090309","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: 6
Performance evaluation of satellite active antennas for a multibeam European coverage at Ku-band ku波段多波束欧洲覆盖卫星有源天线性能评估
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94116
R. Lo Forti, P. Russo, R. Coirault, N. Jensen
{"title":"Performance evaluation of satellite active antennas for a multibeam European coverage at Ku-band","authors":"R. Lo Forti, P. Russo, R. Coirault, N. Jensen","doi":"10.1109/APS.1988.94116","DOIUrl":"https://doi.org/10.1109/APS.1988.94116","url":null,"abstract":"A comparison is made between an antenna configuration using near-field single reflector optics (NFO) and a more conventional focusing antenna (far-field optics) with the aim of showing the impact on the hardware complexity of the departure from the far-field optics. The results show that there are no particular advantages in using focusing antenna systems for generating multibeam coverages, with regard to overall hardware complexity. The required number of feeds and spots, to cover the same service area, are more or less the same (BFN complexity), while the reflector diameter has to be oversized, in the unfocusing antenna case, to maintain a uniform amplitude over the feeding array. Because NFO is capable of concentrating the RF-power resources in the zones where the traffic is present, this antenna configuration is more flexible for use in changing traffic.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"2 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131437953","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: 7
Mechanically steered tracking antenna for land mobile satellite communications 陆地移动卫星通信用机械操纵跟踪天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94341
A. Kuramoto, T. Yamane, N. Endo
{"title":"Mechanically steered tracking antenna for land mobile satellite communications","authors":"A. Kuramoto, T. Yamane, N. Endo","doi":"10.1109/APS.1988.94341","DOIUrl":"https://doi.org/10.1109/APS.1988.94341","url":null,"abstract":"The key price of equipment in the land mobile satellite communication system is the vehicle antenna, because communication must be maintained while the vehicle moves around in regions within satellite beam coverage. Two types of antennas are considered. One is an omnidirectional antenna for a low-gain application, and the other is a beam-steerable antenna for a high-gain application. For the latter, the authors have developed a mechanically steered tracking antenna which consists of an eight-element spiral printed array, a novel single-channel tracking controller, and an antenna drive mechanism. The antenna performance and its tracking system are presented.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"53 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":"128901290","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: 20
Dyadic Green's functions for inhomogeneously filled waveguides 非齐次填充波导的并矢格林函数
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94135
A. S. Omar, K. Schunemann
{"title":"Dyadic Green's functions for inhomogeneously filled waveguides","authors":"A. S. Omar, K. Schunemann","doi":"10.1109/APS.1988.94135","DOIUrl":"https://doi.org/10.1109/APS.1988.94135","url":null,"abstract":"The dyadic Green's functions for inhomogeneously filled waveguides with arbitrary inhomogeneity have been analyzed previously. The analysis is based on an orthogonality relation which is not valid for complex modes. The eigenfunction expansion previously derived is not complete. The authors present a rigorous approach for the determination of the electromagnetic field excited by given electric and magnetic current sources inside an inhomogeneously filled waveguide with arbitrarily shaped cross section and arbitrary inhomogeneity of the filling medium. This problem is completely equivalent to that of determining the guide's electric and magnetic Green's functions.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"24 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":"127645121","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
Reflector antennas with suppressed sidelobes 具有抑制副瓣的反射天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94215
A. Elsherbeni
{"title":"Reflector antennas with suppressed sidelobes","authors":"A. Elsherbeni","doi":"10.1109/APS.1988.94215","DOIUrl":"https://doi.org/10.1109/APS.1988.94215","url":null,"abstract":"The radiation characteristics of a class of two-dimensional reflector antennas is investigated. An array of radiators is used to control the aperture field distribution and hence the gain and the sidelobe levels of the far radiated fields. The method of moments is used to find the induced surface current distribution, the aperture field, and the far-field pattern. Since the problem is two-dimensional, all radiators are considered to be line sources. The numerical results show that the gain is increased and the sidelobe levels are greatly reduced for strip, corner, circular, and parabolic reflector antennas by using three line sources with proper choice of their positions, amplitudes, and phase.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"26 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":"127059082","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
Aperture mutual coupling in a semi-infinite slotted array 半无限狭缝阵列的孔径相互耦合
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93987
R. Scharstein
{"title":"Aperture mutual coupling in a semi-infinite slotted array","authors":"R. Scharstein","doi":"10.1109/APS.1988.93987","DOIUrl":"https://doi.org/10.1109/APS.1988.93987","url":null,"abstract":"Quadrature integration and series summation of the periodic Green's function are used to efficiently compute the mutual admittance matrix for a planar phased array of thin slots with assumed cosinusoidal aperture electric field. The array is of infinite extent in the E-plane and is of finite extent in the H-plane. The H-plane excitation is arbitrary and the array is phase scanned in the E-plane. Resultant active aperture admittances and H-plane aperture distributions are calculated for uniform and 50 dB Chebyshev H-plane excitations.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"40 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":"133769624","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 new adaptive algorithm of frequency-wavenumber estimation 一种新的自适应频波数估计算法
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94363
L. Yin, L. Zhou
{"title":"A new adaptive algorithm of frequency-wavenumber estimation","authors":"L. Yin, L. Zhou","doi":"10.1109/APS.1988.94363","DOIUrl":"https://doi.org/10.1109/APS.1988.94363","url":null,"abstract":"The authors present a novel high-resolution online method for two dimensional (2-D) harmonic retrieval. This method yields asymptotically unbiased estimates of both the DOAs (directions of arrival) and the frequencies of the impinging sources. This adaptive method is based on the singular value decomposition of the signal matrix formed by the maximum eigenvector of the 2-D covariance matrix of the received signal. Compared with other 2-D adaptive algorithms, this method is a more stable 2-D spectral technique. Its convergence rate is faster, and its computational requirement is smaller.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"40 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":"115437481","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
Synthesis of shaped beam antenna patterns using window currents 利用窗口电流合成异形波束天线方向图
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94309
J. Picazo, M.S. Perez, A. Benito
{"title":"Synthesis of shaped beam antenna patterns using window currents","authors":"J. Picazo, M.S. Perez, A. Benito","doi":"10.1109/APS.1988.94309","DOIUrl":"https://doi.org/10.1109/APS.1988.94309","url":null,"abstract":"An analytical noniterative procedure is presented that allows a power pattern with a shaped main lobe to be obtained. The method is based on the fact that the pattern of an array is not more than the Fourier transform of the currents sequence; i.e. the sequence that results from discretizing the inverse Fourier transform of the pattern. This means that the feed currents are the coefficients of the Fourier series of the pattern with only N harmonics for a given array of N elements. The results obtained assure that, although the shape of the main beam is practically constant for all the windows, the transition from the shaped zone to the side lobes becomes more abrupt as the function which is used to convolve is elaborated. A reduction of the side lobes of the function is also accompanied by the same effect in the pattern.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"60 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":"124406556","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 super-absorbing boundary algorithm for solving electromagnetic problems by time-domain finite-difference method 时域有限差分法求解电磁问题的超吸收边界算法
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94110
J. Fang, K. Mei
{"title":"A super-absorbing boundary algorithm for solving electromagnetic problems by time-domain finite-difference method","authors":"J. Fang, K. Mei","doi":"10.1109/APS.1988.94110","DOIUrl":"https://doi.org/10.1109/APS.1988.94110","url":null,"abstract":"An algorithm is presented to treat the absorbing boundaries for the time-domain finite-difference method. With this approach, the leading order error of the conventional local absorbing boundary conditions can be cancelled by a simple algorithm, so that the absorbing quality of the boundary conditions can be greatly improved. The authors concentrate on the local boundary conditions which represent the field values on boundary nodes by several field values inside (and possibly on) the boundary.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"45 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":"124559980","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: 47
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