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

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Measurement of diffraction from isolation edges 隔离边缘衍射的测量
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94014
H. Musal, A. Sklensky
{"title":"Measurement of diffraction from isolation edges","authors":"H. Musal, A. Sklensky","doi":"10.1109/APS.1988.94014","DOIUrl":"https://doi.org/10.1109/APS.1988.94014","url":null,"abstract":"The use of collimated radiation in the near field to produce windowed illumination of test objects is demonstrated to be useful for obtaining experimental data from relatively isolated edges. This is accomplishing by illuminating only about one-third of the edge with a lens-collimated horn antenna. These measurements can be calibrated to yield absolute values for the edge diffraction coefficients for comparison with calculated predictions. The results is experimental data that are in excellent agreement with calculated data.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"114 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":"133514562","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
Optical gain control of a GaAs MMIC transmit-receive module compatible with optical spatial filters 与光学空间滤波器兼容的GaAs MMIC收发模块的光增益控制
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93984
P. Herczfeld, A. Paolella
{"title":"Optical gain control of a GaAs MMIC transmit-receive module compatible with optical spatial filters","authors":"P. Herczfeld, A. Paolella","doi":"10.1109/APS.1988.93984","DOIUrl":"https://doi.org/10.1109/APS.1988.93984","url":null,"abstract":"A description is given of the optical gain control of a microwave amplifier which could be used in antenna beamforming applications. The challenge in developing the experimental circuit was to devise a means for the optical control of the microwave subsystem consistent with microwave monolithic integrated circuits (MMIC) technology, and compatible with optical processing and computing techniques. The experimental circuit consists of four main sections on LED with pigtail, a light-sensitive FET, a DC amplifier, and a distributed microwave amplifier. The electronic circuits are standard GaAs MMIC components which can be integrated into a single chip. A 250- mu W optical signal provided by the LED gave rise to 15 HB of gain control. The approach has several important attributes such as: it is independent of the operating frequency of the microwave components and can be extended to the millimeter range. It is compatible with GaAs MMIC fabrication processes; it can be extended to phase control circuits for pulsed applications; it has a fast response and is cost-effective because it uses a low-cost, low power LED and standard MMIC; and it is totally compatible with parallel optical processing such as spatial filters.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"66 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":"117158158","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
Development of EM modeling software performance standards 电磁建模软件性能标准的制定
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94348
E. Miller
{"title":"Development of EM modeling software performance standards","authors":"E. Miller","doi":"10.1109/APS.1988.94348","DOIUrl":"https://doi.org/10.1109/APS.1988.94348","url":null,"abstract":"The author discusses the issues of how computer models might be characterized and compared, validation of such models by error checking and error analysis, and development of canonical reference solutions and software performance standards. A discussion is presented of the internal and external validation procedures. The types of errors that can render the cross-entropy method (CEM) uncertain are also examined.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"27 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120918332","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
Radar image reconstruction based on neural net models 基于神经网络模型的雷达图像重建
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94193
B. Bai, N. Farhat
{"title":"Radar image reconstruction based on neural net models","authors":"B. Bai, N. Farhat","doi":"10.1109/APS.1988.94193","DOIUrl":"https://doi.org/10.1109/APS.1988.94193","url":null,"abstract":"A novel method for microwave diversity radar imaging based on neural net models was developed. It is based on reconstructing a function f( theta , x, y), called the range-profile, which is a one-dimensional (1-D) Fourier transform of a single p-space line (i.e. of a single frequency-response measurement made at a given aspect angle theta ) weighted by mod p mod , where p is the frequency variable. The issue is how to reconstruct f( theta , x, y) as accurately as possible from the incomplete frequency-domain data. The method utilizes the available frequency-response information and makes no assumption about unavailable frequency components, rather than assuming that they are zero as in conventional techniques. The algorithm developed has been successfully tested by simulation and experiments. Results are presented for an experiment involving two metallic cylinders.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"46 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":"116482962","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: 5
Application of the conjugate gradient FFT method to large radiating systems using subdomain basis functions 子域基函数共轭梯度FFT方法在大型辐射系统中的应用
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93994
K. Barkeshli, J. Volakis
{"title":"Application of the conjugate gradient FFT method to large radiating systems using subdomain basis functions","authors":"K. Barkeshli, J. Volakis","doi":"10.1109/APS.1988.93994","DOIUrl":"https://doi.org/10.1109/APS.1988.93994","url":null,"abstract":"A technique is presented to improve the convergence of the conjugate-gradient fast Fourier transforms (CGFFT) method by the incorporation of subdomain basis functions associated with linear and planar radiating elements. To this end, the current is expressed as a convolution of a pulse basis with a finite sequence of delta functions whose amplitudes are the sampled values of the current. Using this current representation and the convolution theorem, the CGFFT formulation is extended to general basis functions. It is shown that significant improvements are achieved in the convergence of the method using sinusoidal basis functions. The improvement in the convergence is attributed to a more accurate approximation of the antenna current distribution.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"174 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":"116133693","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
Further characterization of a wideband dual polarized microstrip flared slot antenna 宽带双极化微带喇叭槽天线的进一步表征
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94175
M. Povinelli
{"title":"Further characterization of a wideband dual polarized microstrip flared slot antenna","authors":"M. Povinelli","doi":"10.1109/APS.1988.94175","DOIUrl":"https://doi.org/10.1109/APS.1988.94175","url":null,"abstract":"Experimental results have been obtained on a planar dual polarized multioctave flared slot antenna. A design was fabricated and measurements were taken to characterize the performance over an extended frequency band. The input impedance and radiation characteristics of a cavity-backed element are shown to have a bandwidth performance that is increased previously published results.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"12 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":"116946316","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
Optically reconfigured active phased array antennas 光学重新配置有源相控阵天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93985
A. Daryoush, B. Choe
{"title":"Optically reconfigured active phased array antennas","authors":"A. Daryoush, B. Choe","doi":"10.1109/APS.1988.93985","DOIUrl":"https://doi.org/10.1109/APS.1988.93985","url":null,"abstract":"An outline is presented of a study on the impact of active-module failure on the radiation pattern of phased array antennas. A linear phased array composed of 13 active elements was simulated. The interactive simulation program was based on the calculation of array factor by specifying each elements amplitude, phase, spacing and radiation pattern. Results of the simulation predict increases in the sidelobe level associated with reduction in the directivity gain. Degradation on the array factor is also more substantial on the elements closer to the center. For two symmetric elements a similar degradation was observed. As the radiating beam was scanned, asymmetric radiation patterns were predicted for the failed mode of operation. The effects of change in the radiating frequency on the radiation pattern was studied for normal and failure modes of operation. To study the effect of unequal interelement spacing on the radiation pattern under failure modes a linear progression of array spacing was introduced to the 13-element array. Results of this simulation for normal and failure modes of operation are also discussed.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"27 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":"114670569","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: 10
Design of a feeder link antenna for the European DRS satellite 欧洲DRS卫星馈线链路天线的设计
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94064
P. Ramanujam, N. Adatia
{"title":"Design of a feeder link antenna for the European DRS satellite","authors":"P. Ramanujam, N. Adatia","doi":"10.1109/APS.1988.94064","DOIUrl":"https://doi.org/10.1109/APS.1988.94064","url":null,"abstract":"The ground link in the European Data Relay System (DRS) will be established via a single feeder-link antenna assembly forming part of the DRS satellite payload. The antenna will operate in the Ka band and radiate a single high-gain beam to cover several ground stations in Europe. The results of a study carried out to investigate the design of the feeder antenna using the reflector shaping are presented. The basic approach consists of shaping the profile of an offset parabolic such that the gain performance within the two coverage sectors is optimized simultaneously when the reflector is illuminated by a dedicated feed for each coverage. Compared to the conventional multielement-fed parabolic reflector solution, this approach avoids the need for complicated beam forming networks, has a lower mass and, since large aperture feed elements can be used, offers a wider bandwidth potential.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"199 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":"114749767","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 direct look at creeping waves 直接看到蠕动的波浪
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94095
G. Herrmann
{"title":"A direct look at creeping waves","authors":"G. Herrmann","doi":"10.1109/APS.1988.94095","DOIUrl":"https://doi.org/10.1109/APS.1988.94095","url":null,"abstract":"To the human eye light rays appear as entities emanating from well defined bright regions on a scattering body. It is argued that these regions, whether associated with specular reflection, edge diffraction, or creeping waves (appearing as bright boundaries on curved bodies), can each be observed and studied independently using the filtering functions inherent in vision. The author discusses processing of a similar kind, emulated computationally, by simple windowing, of computed radiation. Sample data are shown that were obtained by applying to the outgoing axial field component a fourth-order Blackman-Harris window that is centered 90 degrees behind the observer and extends over 180 degrees . The magnitude (in terms of a scattering width) of the windowed radiation from an impedance cylinder is graphed for various impedance levels. Remapping these results provides the decay and launching constants for the dominant creeping wave modes.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"162 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":"116162721","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
A flush-mounted antenna for mobile communications 一种用于移动通信的平装天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94343
K. Kaneta, T. Kondo, M. Ando, N. Goto
{"title":"A flush-mounted antenna for mobile communications","authors":"K. Kaneta, T. Kondo, M. Ando, N. Goto","doi":"10.1109/APS.1988.94343","DOIUrl":"https://doi.org/10.1109/APS.1988.94343","url":null,"abstract":"A description is given of a flush-mounted car phone antenna. The antenna is mounted in a circular hole. The disk is attached to the center feed pin. Thin short pins are annularly located around the feed. The key parameters in the mounting are the diameter and the depth of the hold which accommodates the antenna. Characteristics of the flush-mounted antenna, that is, the resonant frequency, bandwidth and radiation pattern, are measured and are compared with the original planar antenna. Performance degradation due to rain is estimated.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"230 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":"116141678","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
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