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

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A circular antenna utilizing phase only adaptive nulling 采用相位自适应消零的圆形天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94250
R. Flam, J. Bull, A. Sinsky, J. Acoraci, C. Wischhusen
{"title":"A circular antenna utilizing phase only adaptive nulling","authors":"R. Flam, J. Bull, A. Sinsky, J. Acoraci, C. Wischhusen","doi":"10.1109/APS.1988.94250","DOIUrl":"https://doi.org/10.1109/APS.1988.94250","url":null,"abstract":"A novel, phase-only adaptive nulling algorithm has been developed as an 'applique' for a multimode circular antenna. It provides the capability to suppress undesired jamming signals by spatial filtering. The algorithm minimizes the antenna's output power while maintaining the direction of its main beam. It has been verified through computer simulation and experimentation.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"434 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":"116010267","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
Measurement of vertical radiation patterns of OTH radar antenna array using a tethered aerostat 用系留浮空器测量OTH雷达天线阵列的垂直辐射方向图
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94062
X. Lianrong
{"title":"Measurement of vertical radiation patterns of OTH radar antenna array using a tethered aerostat","authors":"X. Lianrong","doi":"10.1109/APS.1988.94062","DOIUrl":"https://doi.org/10.1109/APS.1988.94062","url":null,"abstract":"It is known that the vertical radiation patterns of a broadside array depend mainly on its element patterns, the vertical radiation pattern of a small array consisting of several elements can therefore represent the true array in a shortened test range. Using this effect, the vertical patterns of an experimental over the horizon (OTH) array were measured successfully using a tethered aerostat. An array with 32 elements was built over a sector conducting ground screen with square grids. Topics briefly mentioned include the aerostat's stability and the communication system used to transfer the data from the aerostat to the ground.<<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":"117083747","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
Fan beam patterns radiated from a parabolic reflector antenna 从抛物面反射天线辐射的扇形波束图
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94117
J. Huang, Y. Rahmat-Samii, M. Gatti
{"title":"Fan beam patterns radiated from a parabolic reflector antenna","authors":"J. Huang, Y. Rahmat-Samii, M. Gatti","doi":"10.1109/APS.1988.94117","DOIUrl":"https://doi.org/10.1109/APS.1988.94117","url":null,"abstract":"A technique for a single parabolic reflector antenna to generate both the high-gain pencil beam pattern and the needed surface mapping fan beam pattern is presented. A simple 2-D physical optics analysis has demonstrated that when a parabolic cylindrical reflector is fed by an array, a pulselike wide-beam far-field pattern can indeed be generated. The calculated pattern of a 3.65 m 2-D reflector antenna with f/D ratio of 0.333 is shown. The reflector is center-fed by a 13.6 GHz array of microstrip elements with 0.6 wavelength element spacing and uniform amplitude distribution. A ripple is formed on top of the beam because the reflector is in the near field of the array and thus the surface current formed on the reflector is not exactly sin x/x. In addition, not all the sidelobes of the array illuminate the reflector. Experimental results are reported for the Titan radar mapper, which requires a dual-fan-beam system with one beam on each side of the antenna axis. In this way, when the spacecraft flies by the Titan, the planet surface can be effectively mapped with a single radar by fast switching between the two fan beams. Due to the need of radar signatures at different encounter distances between the spacecraft and Titan surface, several fan beam scenarios are required, such as different beam widths and beam scan angles. Results for two cases are shown to demonstrate and verify the concept.<<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":"129411866","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
Scattering from array of metallic patches located on a curved surface 位于曲面上的金属块阵列的散射
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94155
W. Ko, R. Mittra
{"title":"Scattering from array of metallic patches located on a curved surface","authors":"W. Ko, R. Mittra","doi":"10.1109/APS.1988.94155","DOIUrl":"https://doi.org/10.1109/APS.1988.94155","url":null,"abstract":"The method of analysis developed for the planar-array case is extended to the problem of a conformal array arranged on a parabolic cylindrical surface with the objective of computing the scattering properties of the curved array. The results obtained can be used for the design of curved frequency selective reflectors and radomes. Although the discussion is based on a parabolic cylindrical surface, the technique can be extended to deal with other surface geometries as well. The surface current on each patch is assumed to be the same as the current induced on the center patch of a planar array which is tangential to the parabolic cylindrical surface at the patch. The planar array problem is solved by the spectral Galerkin's method. The scattered pattern from each of these patches is computed from the current induced on the patch. The superposition principle is the invoked to obtain the scattering from the conformal array.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"3 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":"128535448","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
Radiation and scattering by infinite microstrip patch arrays on anisotropic substrates 各向异性基底上无限微带贴片阵列的辐射和散射
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93976
F. Harackiewicz, D. Pozar
{"title":"Radiation and scattering by infinite microstrip patch arrays on anisotropic substrates","authors":"F. Harackiewicz, D. Pozar","doi":"10.1109/APS.1988.93976","DOIUrl":"https://doi.org/10.1109/APS.1988.93976","url":null,"abstract":"An analysis is presented of an infinite array of printed patches on a grounded anisotropic-dielectric slab. The array is considered as both a transmitter fed by idealized probes and as a scatterer of plane waves. For the transmitter case, the input reflection coefficient versus incident angle is computed for various loads and substrates. The theory in both cases is confirmed by comparing its limit to isotropic cases with previous analyses. The inputs to the analysis are the substrate parameters, the array grid geometry, the patch dimensions including probe position, and the probe load impedance, which is assumed conjugate matched at broadside for the transmit case.<<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":"129312884","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 dielectric rod leaky-wave antenna with a conducting ground plane 一种具有导电接地面的介电杆漏波天线
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94072
K. Narayanan, K. Vasudevan, K. Nair
{"title":"A dielectric rod leaky-wave antenna with a conducting ground plane","authors":"K. Narayanan, K. Vasudevan, K. Nair","doi":"10.1109/APS.1988.94072","DOIUrl":"https://doi.org/10.1109/APS.1988.94072","url":null,"abstract":"The effect of a conducting ground plane on the radiation pattern, voltage standing-wave ratio (VSWR) and gain of a dielectric rod leaky-wave antenna is investigated. Experiments are performed using copper strips as perturbations on a rod of dielectric constant 2.54. The metallic strip perturbations were on the broader side of the rectangular dielectric waveguide. The conducting ground plane was on the opposite side of the perturbed face. The E-plane radiation patterns were plotted in the X-band with strips of width 1 cm, for various perturbation spacings such as 1.75 cm, 1.9 cm, 2 cm, 2.1 cm and 2.25 cm. The experimental results reveal that the presence of the conducting ground plane improves the performance of the antenna.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"14 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":"127147251","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
Application of running Hartley transforms in adaptive antenna arrays 运行哈特利变换在自适应天线阵列中的应用
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94255
T.A. Braaten, P.K. Bondyopadhyay
{"title":"Application of running Hartley transforms in adaptive antenna arrays","authors":"T.A. Braaten, P.K. Bondyopadhyay","doi":"10.1109/APS.1988.94255","DOIUrl":"https://doi.org/10.1109/APS.1988.94255","url":null,"abstract":"The running discrete Hartley transform (RDHT) has been introduced along with its applications in adaptive digital filtering. The authors present the application of RDHT to adaptive antenna arrays. This algorithm is applied to a very simple adaptive array problem to show its effectiveness, an array of nine equidistant isotropic radiating elements. It is shown that the algorithm converges to the desired solution in less than ten iterations. Advances in VLSI technology allow hardware implementation of the transformation, so that the transform-domain LMS (least-mean-squares) algorithm will produce faster convergence of the adaptation process.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"85 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":"127196211","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
Characteristics of the scanning antenna with a plane aperture 平面孔径扫描天线的特性
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94275
S.-M. Li
{"title":"Characteristics of the scanning antenna with a plane aperture","authors":"S.-M. Li","doi":"10.1109/APS.1988.94275","DOIUrl":"https://doi.org/10.1109/APS.1988.94275","url":null,"abstract":"The transient behavior of a rectangular scanning antenna was studied previously (1985) by the author. The analytical method is extended to the scanning antenna with a plane aperture. The author considers the radiation field to be the output of a time-invariant system. This makes it possible to analyze the characteristics of the antenna with linear system theory. He obtains the transfer function to prove that the system is stable and to provide a reliable basis for the transient analysis. The gain of the system can be also obtained. It is shown that the energy ratio of output and input in the scanning direction can be expressed by the gain of the system and the RMS (root-mean-square) bandwidth of the input signal. A simple formula directly calculable in the time domain is found for the far field.<<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":"129161409","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
Numerical study of SEM 扫描电镜数值研究
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94166
L. Zhang, P. Wang, W. Wang
{"title":"Numerical study of SEM","authors":"L. Zhang, P. Wang, W. Wang","doi":"10.1109/APS.1988.94166","DOIUrl":"https://doi.org/10.1109/APS.1988.94166","url":null,"abstract":"The validity of the singular expansion method (SEM) for transient scattering from a perfectly conducting sphere is investigated under different excitations. One of the advantages of choosing a sphere to be the scatterer is that the conclusion obtained may be more general than that drawn from a one or two-dimensional scatterer. The following conclusions are drawn: (1) using an incomplete collection of poles in the SEM expansion together with time-independent coefficients to calculate scattering current and scattered field is valid when the first creeping wave reaches the observation point; (2) the speed of the convergence of Prony series in one-direction and n-direction is mainly dependent on observation time and the properties of the excitation, respectively; and (3) SEM expansion is efficient to describe creeping wave contribution but not valid to describe the reflect portion in the response.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"14 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":"132892869","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
Comparison of convergence rates of the conjugate gradient method applied to various integral equation formulations 共轭梯度法在不同积分方程中的收敛速度比较
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94035
J. E. Wheeler, Donald R. Wilton
{"title":"Comparison of convergence rates of the conjugate gradient method applied to various integral equation formulations","authors":"J. E. Wheeler, Donald R. Wilton","doi":"10.1109/APS.1988.94035","DOIUrl":"https://doi.org/10.1109/APS.1988.94035","url":null,"abstract":"A comparison is presented of the relative convergence properties of the conjugate gradient method using the three principal integral equations for conducting scatterers: the electric field integral equation (EFIE), the magnetic field integral equation (MFIE), and the combined field integral equation (CFIE). The authors restrict their study to scattering by two-dimensional (cylindrical) bodies (both TM and TE polarization). This enables an easy examination of the convergence behaviour of the conjugate gradient method (CGM) for bodies which are electrically large.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"36 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":"132144357","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: 36
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