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Antennas and Propagation Society Symposium 1991 Digest最新文献

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An accurate 3-D solution of coplanar waveguides by the duality principle of dipoles and slots 用偶极子和槽的对偶原理精确求解共面波导的三维问题
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174984
A. A. Omar, Y. Chow
{"title":"An accurate 3-D solution of coplanar waveguides by the duality principle of dipoles and slots","authors":"A. A. Omar, Y. Chow","doi":"10.1109/APS.1991.174984","DOIUrl":"https://doi.org/10.1109/APS.1991.174984","url":null,"abstract":"A highly convergent and accurate 3-D model for solving general coplanar waveguide (CPW) circuits is developed. This model uses the duality principle to convert the coplanar waveguide problem into two coupled strips problems for which a simple solution is easily obtained. To verify the accuracy of this model, the effective dielectric constant and characteristic impedance of the CPW are calculated and compared to available 2-D results. Very good agreement is obtained.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131712757","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
Scattering models for infinite periodic structures at low frequencies 无限周期结构的低频散射模型
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174828
K.W. Whites, R. Jorgenson, R. Mittra
{"title":"Scattering models for infinite periodic structures at low frequencies","authors":"K.W. Whites, R. Jorgenson, R. Mittra","doi":"10.1109/APS.1991.174828","DOIUrl":"https://doi.org/10.1109/APS.1991.174828","url":null,"abstract":"Lossy 1-D periodic strip gratings and lossy 2-D periodic FSSs (frequency selective screens) and honeybombs are investigated using two models: an anisotropic half space having its optic axis in the plane of periodicity, and an infinite impedance plane having a prescribed surface impedance which is calculated using a tensor impedance boundary condition (TIBC) from the anisotropic half space of the first model. It is concluded that the anisotropic half space and TIBC models can predict, with good accuracy, the reflections at a much reduced cost for unit cell dimensions <0.1 lambda . In the honeycomb example, each angle of incidence requires approximately 30 s for computation on a Cray 2 while only a few seconds was needed on a PC for both approximate models for all angles of incidence. These models are not intended to supersede more exact numerical solutions but rather to complement the analysis in cases when quick, approximate solutions are acceptable or when optimization studies are undertaken to maximize certain electromagnetic characteristics.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127563783","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
The experimental determination of the calibrated S-parameters of a single resonant-slot array element 单谐振槽阵列元件标定s参数的实验测定
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175080
R. Speciale
{"title":"The experimental determination of the calibrated S-parameters of a single resonant-slot array element","authors":"R. Speciale","doi":"10.1109/APS.1991.175080","DOIUrl":"https://doi.org/10.1109/APS.1991.175080","url":null,"abstract":"A simple and quick experimental method has been developed for experimentally determining the calibrated scattering parameters of a single resonant-slot array element. The obtained calibrated scattering matrix is defined at two planar interfaces directly coincident with the front and back surfaces of the metal plate surrounding the slot. This measurement method determines different scattering matrices for the same slot, depending on the type of waveguide and the specific waveguide mode used to feed it. An example of a calibrated transmission response of a single slot, excited by the fundamental TE/sub 11/ mode of the cylindrical cavity used to feed it on either side, is presented. The slot resonance appears to be very wide and there is hardly any transmission-phase lag at its center.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130826399","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
Computer simulation of radome scattering effects for the satellite communication earth stations 卫星通信地面站天线罩散射效应的计算机模拟
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175175
E. Ngai, M. Naor, A. P. Smolski, A.C. Hsu
{"title":"Computer simulation of radome scattering effects for the satellite communication earth stations","authors":"E. Ngai, M. Naor, A. P. Smolski, A.C. Hsu","doi":"10.1109/APS.1991.175175","DOIUrl":"https://doi.org/10.1109/APS.1991.175175","url":null,"abstract":"The authors investigate the electromagnetic scattering characteristics of metal space frame (MSF) radomes and assess their RF performance for the satellite communication earth station application. It is demonstrated that the current polarization specification used in the INTELSAT system can be met satisfactorily by MSF-radome-covered earth stations with conventional antennas. Typical radome co-polar and cross-polar scattering patterns are simulated and shown. It can be seen that the copolar-scattered fields, outside the main beam, have negligible effect on the copolar antenna pattern. Further, it is shown that the scattered cross-polar fields within the antenna tracking beamwidths are less than -40 dB down from the co-polar antenna pattern peak. The current INTELSAT V and VII specification is 30.7 dB for the cross-polarization purity level and hence adequate performance from the system enclosed with a radome is achieved.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132853987","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
Complex image method for analyzing multiconductor transmission lines in multilayered dielectric media 多层介质中多导体传输线的复像分析方法
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174980
J.J. Yang, G. Howard, Y. Chow
{"title":"Complex image method for analyzing multiconductor transmission lines in multilayered dielectric media","authors":"J.J. Yang, G. Howard, Y. Chow","doi":"10.1109/APS.1991.174980","DOIUrl":"https://doi.org/10.1109/APS.1991.174980","url":null,"abstract":"The complex image method is used to analyze multiconductor transmission lines in multilayered media. The effects of all dielectric interfaces and ground planes are taken into account by complex images. Chebyshev polynomials are used as the basis function in solving the unknown charge distributions on the conductor surfaces. In general, the resultant matrix size of this analysis is no more than 3N*3N for an N-strip transmission system. Numerical examples of a single line, twin lines, and three lines printed on a microstrip substrate are calculated. Numerical results show the accuracy of this analysis.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133591579","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
Green's functions analysis of planar thin wire structures in a two layer grounded medium 平面细线结构在两层接地介质中的格林函数分析
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175102
F.A. Monferrer, A. Kishk
{"title":"Green's functions analysis of planar thin wire structures in a two layer grounded medium","authors":"F.A. Monferrer, A. Kishk","doi":"10.1109/APS.1991.175102","DOIUrl":"https://doi.org/10.1109/APS.1991.175102","url":null,"abstract":"A mixed potential integral equation (MPIE) formulation is used for planar thin wires in a two-layer grounded medium. The current distribution and input impedance are obtained for several configurations. The cases of a linear dipole and a circular loop antenna excited by a delta-gap source are examined.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133623804","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 combined analog/digital hybrid multi/channel airborne satellite communication system 一种组合模拟/数字混合多/通道机载卫星通信系统
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175160
M. El-Rayes, M. Abdelrazik
{"title":"A combined analog/digital hybrid multi/channel airborne satellite communication system","authors":"M. El-Rayes, M. Abdelrazik","doi":"10.1109/APS.1991.175160","DOIUrl":"https://doi.org/10.1109/APS.1991.175160","url":null,"abstract":"Summary form only given. A technical description of a multichannel airborne analog/digital satellite communication system is presented. The system design required the combining of a 60 W class-A HPA and a 200 W class-C HPA onto an eight-element helical array antenna to provide analog and digital multichannel communication services to aircraft that include telephone, data, and TTY. The analog portion of the system uses FM techniques to provide one channel of high quality voice. The digital portion uses A-QPSK (quadrature phase-shift keying)/A-BPSK (binary phase shift keying) modulation schemes with appropriate forward error correction to provide toll quality multichannel voice capability to the aircraft. World-wide communication coverage is provided by the INMARSAT network of satellites and ground stations.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133654658","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
Suppression of reflection from slots in a linearly-polarized radial line slot antenna 线偏振径向线槽天线槽反射抑制
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175098
J. Takeda, M. Ando, N. Goto
{"title":"Suppression of reflection from slots in a linearly-polarized radial line slot antenna","authors":"J. Takeda, M. Ando, N. Goto","doi":"10.1109/APS.1991.175098","DOIUrl":"https://doi.org/10.1109/APS.1991.175098","url":null,"abstract":"The authors present a new slot design for a single-layer linearly polarized radial line slot antenna which suppresses the reflection from slots. The design procedure of the array is presented. A slot set is optimized to minimize the reflection. Then, sets are arrayed all over the aperture to realize uniform aperture distribution. The design is confirmed by measurements.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"6 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132433322","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
Design of a phase/frequency scanned array antenna with non-resonant slotted ridge waveguide elements 带非谐振槽脊波导元件的相位/频率扫描阵列天线设计
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175191
A. Derneryd, T.C. Lorentzon
{"title":"Design of a phase/frequency scanned array antenna with non-resonant slotted ridge waveguide elements","authors":"A. Derneryd, T.C. Lorentzon","doi":"10.1109/APS.1991.175191","DOIUrl":"https://doi.org/10.1109/APS.1991.175191","url":null,"abstract":"The synthesis of a two-dimensionally scanned antenna is presented. The antenna is scanned in one direction by ferrite phase shifters and in the other direction by frequency scanned waveguides. In order to accomplish a wide electronic scan range the waveguide width has been reduced by ridge loading. The radiating elements consist of broadwall shunt slots. The characterization of the radiating slots has required the development of new design models as well as special testing techniques. The antenna requirements include a large scan sector in azimuth, low sidelobes, high pointing accuracy, and high antenna gain. These requirements demand an accurate design method and a well-controlled manufacturing process. A large antenna was designed, manufactured, and, tested, consisting of 48 waveguides, each fed through 8-bit ferrite phase shifters.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133100598","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: 13
Rough elevated layers and tropospheric microwave propagation 粗糙高架层与对流层微波传播
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175149
A. Webster, J. Jones
{"title":"Rough elevated layers and tropospheric microwave propagation","authors":"A. Webster, J. Jones","doi":"10.1109/APS.1991.175149","DOIUrl":"https://doi.org/10.1109/APS.1991.175149","url":null,"abstract":"A theoretical approach is described which takes into account the roughness of the tropospheric layers in line-of-sight microwave links. The approach used here is essentially that used by A. R. Webster (1983). where the elevated layer is modeled using an arctan function to describe the variation in refractivity N, with height, h, In order to simulate the variation of the layer height along the path a collection of sinusoids is used with varying amplitude, wavelength and phase, so that the layer height, h/sub o/, is modified in a specified way: being differentiable, this choice allows the gradient Delta N to be determined readily despite the horizontal gradients introduced by the fluctuations. Results are presented and discussed.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128862611","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
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