IEEE Antennas and Propagation Society International Symposium 1992 Digest最新文献

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Microstrip antenna array for mobile satellite communications 移动卫星通信用微带天线阵列
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-08-01 DOI: 10.1109/APS.1992.221890
A. Petosa, P. Strickland, J. Wight
{"title":"Microstrip antenna array for mobile satellite communications","authors":"A. Petosa, P. Strickland, J. Wight","doi":"10.1109/APS.1992.221890","DOIUrl":"https://doi.org/10.1109/APS.1992.221890","url":null,"abstract":"A novel array using microstrip elements for mobile satellite communications is presented. The cylindrical patch array consists of 18 circularly polarized microstrip patches, arranged around an inclined cylinder. The radiation elements were modified to reduce their resonant size, thus allowing for a compact array. A high-gain beam was achieved. It was electronically steered in azimuth for satellite tracking. A 10 dBic gain was achieved over elevation angles from 10 degrees to 50 degrees for a bandwidth of 1530 to 1660.5 MHz, ideal for mobile satellite coverage in Canada.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114903458","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
A small wideband antenna printed on the same LiNbO/sub 3/ substrate as the integrated optical modulator 与集成光调制器相同的LiNbO/ sub3 /衬底上印刷的小型宽带天线
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221831
N. Kuwabara, T. Ideguchi, R. Kobayashi
{"title":"A small wideband antenna printed on the same LiNbO/sub 3/ substrate as the integrated optical modulator","authors":"N. Kuwabara, T. Ideguchi, R. Kobayashi","doi":"10.1109/APS.1992.221831","DOIUrl":"https://doi.org/10.1109/APS.1992.221831","url":null,"abstract":"A 9.5-mm-long dipole antenna was printed on the LiNbO/sub 3/ substrate where a Mach-Zehnder interferometer had been formed from an optical waveguide. An equivalent circuit of the sensor was created to calculate the sensitivity and the frequency response, and the circuit parameters were obtained using the moment method and were also measured. The measured sensitivity and frequency response of the antenna closely agree with the calculated values. The measured frequency response is almost flat from 100 Hz to 2.5 GHz.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115214441","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 efficient methods for including thin material sheets in the FDTD technique 讨论了在时域有限差分技术中加入薄材料片的有效方法
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221538
J. Maloney, G.S. Smith
{"title":"A discussion of efficient methods for including thin material sheets in the FDTD technique","authors":"J. Maloney, G.S. Smith","doi":"10.1109/APS.1992.221538","DOIUrl":"https://doi.org/10.1109/APS.1992.221538","url":null,"abstract":"Two approaches (which were applied to a parallel plate waveguide) for including thin material sheets in the finite-difference time-domain (FDTD) technique are compared. The first approach by J.G. Maloney and G.S. Smith (see IEEE Trans. Antennas Propag., vol.AP-40, no.3, 1992) uses a special FDTD cell to handle the sheet. Throughout the cell the component of the electric field tangential to the sheet is assumed to be constant. However, the component of the electric field normal to the sheet assumes different constant values in the sheet and in the space adjacent to the sheet. The discontinuity of the normal component of the electric field at the surface of the sheet allows for the presence of surface charge. In the second approach by P.A. Tirkas and K.R. Demarest (see IEEE Trans. Antennas Propag., vol.AP-39, no.9, p.1338, 1991) the component of the electric field tangential to the sheet is also assumed to be constant, but the component of the electric displacement normal to the sheet is assumed to vary linearly across the cell. This makes the normal component of the electric field jump by the ratio of the dielectric constants at the surface of the sheet. There are some subtle differences in the two approaches; these may make one prefer one of the approaches over the other for a particular application.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125222244","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
Application of three-dimensional vector OSRC to electromagnetic scattering 三维矢量OSRC在电磁散射中的应用
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221475
Z. Chen, W. Zhang
{"title":"Application of three-dimensional vector OSRC to electromagnetic scattering","authors":"Z. Chen, W. Zhang","doi":"10.1109/APS.1992.221475","DOIUrl":"https://doi.org/10.1109/APS.1992.221475","url":null,"abstract":"A three-dimensional vector boundary condition that applies to the surface of the scatterer is used to formulate a novel 3-D OSRC (on-surface radiation condition) based on Wilcox's (1956) asymptotic expansion, for solving electromagnetic scattering from a perfectly conducting body. The numerical results of the current distribution on conducting spheres with different sizes are in good agreement with the exact solution.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"13 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120834916","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 PC-based UHF propagation study in an urban environment 城市环境下基于pc机的超高频传播研究
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221636
J. Grimmer, S. Laxpati
{"title":"A PC-based UHF propagation study in an urban environment","authors":"J. Grimmer, S. Laxpati","doi":"10.1109/APS.1992.221636","DOIUrl":"https://doi.org/10.1109/APS.1992.221636","url":null,"abstract":"A small-scale study to evaluate the principal modes of propagation for an experimental, beyond-the-horizon UHF link is presented. The propagation channel was characterized statistically in several ways. The data collected exhibited characteristics of both troposcatter and diffraction modes of propagation, with heavy influence from anomalies such as aircraft reflections and ducting. The movement of weather fronts through the region influences the runways used by aircraft, and thus the degree of fading due to aircraft. Weather fronts also influenced the principal mode and characteristics of propagation. The correlation between meteorological conditions and the degree of fading observed was biased by the heavy air traffic and the large beamwidth receiver antenna used.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127093195","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
Low frequency electromagnetic penetration of loaded apertures; a canonical case 加载孔的低频电磁侵彻;一个典型案例
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221738
V. Daniele, M. Gilli
{"title":"Low frequency electromagnetic penetration of loaded apertures; a canonical case","authors":"V. Daniele, M. Gilli","doi":"10.1109/APS.1992.221738","DOIUrl":"https://doi.org/10.1109/APS.1992.221738","url":null,"abstract":"In order to obtain a solution of a canonical problem in closed form, a planar structure is considered. The first part of the structure is an infinitesimally thin perfectly conducting halfplane, while the second one consists of a wire-mesh halfplane. The wire mesh is described by the equivalent sheet impedance operator, derived by K.F. Casey (1981), which is valid when the mesh dimensions are small in comparison with the wavelength. The diffraction of an obliquely incident plane wave is studied by means of a Wiener-Hopf technique. The cases of transverse-electric and transverse-magnetic incidence are considered.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127294605","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
Intercomparison of permittivity measurements using the transmission/reflection method in 7-MM COAX 在7mm同轴电缆中透射/反射法测量介电常数的比较
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221548
E. Vanzura
{"title":"Intercomparison of permittivity measurements using the transmission/reflection method in 7-MM COAX","authors":"E. Vanzura","doi":"10.1109/APS.1992.221548","DOIUrl":"https://doi.org/10.1109/APS.1992.221548","url":null,"abstract":"Summary form only given. To aid in standardizing the transmission/reflection (T/R) method, the National Institute of Standards and Technology (NIST) organized a nationwide intercomparison of permittivity measurements in the 50 MHz to 187 GHz frequency range. The T/R method involves calculation of relative permittivity ( in /sub r/) and permeability ( mu /sub r/) from transmitted and reflected scattering parameters measured by a network analyzer. Three sample kits have been circulated among fifteen participating organizations. Each kit will be circulated to five different participants. All three sample kits contain four materials with in /sub r/ ranging from approximately 5 to 20, and one sample kit contains a fifth, high-permittivity sample with in /sub r/ somewhere between 35 and 60. Measurement results are compared with each other and with high-accuracy cavity resonator measurements made by NIST. The commonly implemented Nicholson/Ross algorithm is shown to be less accurate and much more unstable than the Baker-Jarvis algorithm, especially when the sample is longer than a half wavelength.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124833508","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
Consideration of a one-way dispersive boundary condition (DBC) for the FD-TD method FD-TD方法中单向色散边界条件的考虑
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221932
Bi Zhiqiang, J. Litva
{"title":"Consideration of a one-way dispersive boundary condition (DBC) for the FD-TD method","authors":"Bi Zhiqiang, J. Litva","doi":"10.1109/APS.1992.221932","DOIUrl":"https://doi.org/10.1109/APS.1992.221932","url":null,"abstract":"The reflection coefficient for the dispersive boundary condition (DBC) is formulated. A one-way dispersive boundary condition is generalized and developed. The behavior of the reflection coefficients for second- and third-order DBCs is shown.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123287853","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
Investigation on the stability of absorbing boundary conditions for the time-domain finite-difference method 时域有限差分法吸收边界条件稳定性研究
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221879
J. Fang
{"title":"Investigation on the stability of absorbing boundary conditions for the time-domain finite-difference method","authors":"J. Fang","doi":"10.1109/APS.1992.221879","DOIUrl":"https://doi.org/10.1109/APS.1992.221879","url":null,"abstract":"Due to the instability of absorbing boundary conditions, numerical solutions spuriously grow as computations proceed; sooner or later, numerical errors override actual solutions. It has been found that the higher the order of the absorbing boundary condition applied, the stronger the instability. In the present work, it is shown that the instability originates from the computer roundoff error in the process of calculating boundary values. This error is further accumulated as the computation goes on. Numerical examples illustrate the instability caused by boundary conditions, and examine the way to suppress the instability.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123294440","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: 8
Optimal surface adjustment of haystack antenna 干草堆天线表面优化调整
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221816
M. Zarghamee, J. Antebi
{"title":"Optimal surface adjustment of haystack antenna","authors":"M. Zarghamee, J. Antebi","doi":"10.1109/APS.1992.221816","DOIUrl":"https://doi.org/10.1109/APS.1992.221816","url":null,"abstract":"A procedure has been developed for the optimal adjustment of the primary reflector surface of an antenna. This procedure, when applied to the haystack radio telescopic antenna, involves the iterative adjustment of standoffs and shear studs, expanders, and cable guide offsets in the back of the panels. Optimal adjustments are selected to minimize the resulting surface RMS of the antenna, subject to the constraints of loss of precompression across expanders. It has been demonstrated that the procedure can be used effectively to improve the surface RMS of the haystack antenna to the goal of less than 200 micron (8 mil).<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123414049","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: 9
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