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Antennas and Propagation Society Symposium 1991 Digest最新文献

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The effect of ALS and ILS localizer on the MLS azimuth phased array antenna 渐近制导和渐近制导定位器对渐近制导方位相控阵天线的影响
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175050
M. Elgamal, S. Latieule
{"title":"The effect of ALS and ILS localizer on the MLS azimuth phased array antenna","authors":"M. Elgamal, S. Latieule","doi":"10.1109/APS.1991.175050","DOIUrl":"https://doi.org/10.1109/APS.1991.175050","url":null,"abstract":"As a radiating system operating in airports having hangers, buildings, the approach light system (ALS), and the Instrument Landing System (ILS), the MLS (Microwave Landing System) azimuth phased-array antenna will be subject to unwanted reflections (multipath) from these obstacles. It is important to determine these propagation errors as they are essential for siting the MLS antennas with the collocated ILS system and ALS light lanes. The scattering problem is formulated and solved, and the MLS guidance error is determined. In addition, the propagation error components of the path following error (PFE) are obtained and analyzed. The peak MLS guidance error and the PFE are functions of the ALS or ILS structure and their distances from the MLS azimuth antenna phased array. It is concluded that in order to keep these errors within the acceptable tolerances care must be taken in siting MLS phased-array with respect to the existing ILS localizer.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"34 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":"127163141","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
An improved kernel for arrays of cylindrical dipoles 圆柱偶极子阵列的改进核
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174918
D. K. Freeman, T.T. Wu
{"title":"An improved kernel for arrays of cylindrical dipoles","authors":"D. K. Freeman, T.T. Wu","doi":"10.1109/APS.1991.174918","DOIUrl":"https://doi.org/10.1109/APS.1991.174918","url":null,"abstract":"An improved kernel governing the interaction between parallel, nonstaggered, perfectly conducting cylindrical dipoles is introduced. The formulation is used to evaluate the symmetric component kernel for the circular array asymptotically as the number of dipoles tends to infinity while the ratio of the number of dipoles to the radius of the circle remains constant. It is shown that, under suitable conditions, the imagery part of this kernel tends to zero exponentially, suggesting the existence of exponentially narrow resonances.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"54 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":"127499228","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
Abnormal pattern design to minimize field in the sensitive region 不正常的图案设计，以尽量减少场在敏感区域
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175112
Zhenping Xiang, Yinchao Chen
{"title":"Abnormal pattern design to minimize field in the sensitive region","authors":"Zhenping Xiang, Yinchao Chen","doi":"10.1109/APS.1991.175112","DOIUrl":"https://doi.org/10.1109/APS.1991.175112","url":null,"abstract":"Signal interference near TV broadcasting stations has become a big problem. Sometimes, the transmitting power of a TV signal could be as much as 30 kW and heavily disturb the normal operation of the electronics. radar, and air-guidance systems near the area. This area is called the sensitive region. An attempt is made to minimize the field intensity within the sensitive region near a TV broadcasting station. while maintaining the direction of the mainbeam. Perturbation, weighting amplitude, and Powell optimization methods are used simultaneously to design the array with such characteristics. Numerical results show that these characteristics can be achieved with the approach described here.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"94 6 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":"126029558","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
The application of flux corrected transport to transient electromagnetic phenomena 通量修正输运在瞬变电磁现象中的应用
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174859
S. Omick, S. Castillo, R. Hills
{"title":"The application of flux corrected transport to transient electromagnetic phenomena","authors":"S. Omick, S. Castillo, R. Hills","doi":"10.1109/APS.1991.174859","DOIUrl":"https://doi.org/10.1109/APS.1991.174859","url":null,"abstract":"The authors describe the application of flux-corrected transport (FCT), a scheme which allows the accurate numerical analysis of waveshapes that have steep leading or trailing edges. The idea behind the method is to use both a lower-order and, separately, a higher-order approximation to the spatial derivative. The solutions are then combined node by node using a nonlinear weighting scheme that does not allow new maxima or minima to form. The method of FCT is discussed in the context of applications to time-dependent electromagnetic problems. The results indicate a drastic improvement in the solution in regions where steep gradients appear as in pulse propagation. The results of the addition of FCT to the original Lax-Wendroff algorithm are presented. It can be seen that the wavefront is maintained without the additional burden of ripples in the solution.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"55 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":"123311664","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
Limitations of a sidelobe canceller concept 副瓣对消概念的局限性
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174780
R. Dybdal
{"title":"Limitations of a sidelobe canceller concept","authors":"R. Dybdal","doi":"10.1109/APS.1991.174780","DOIUrl":"https://doi.org/10.1109/APS.1991.174780","url":null,"abstract":"An analysis is presented which suggests that adding a sidelobe canceller to an existing antenna will not produce effective cancellation over a bandwidth. fortunately, an alternative exists which uses adaptive transversal filters to correct for antenna dispersion and a simple set of horn elements whose gain exceeds the sidelobe gain of the main reflector to avoid unnecessary increases in the system noise temperature. The horn elements also avoid any gain loss due to increased aperture blockage from the additional auxiliary feeds in the focal region.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"53 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":"123602005","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
Ion transition height distribution deduced from satellite ISS-b 由ISS-b卫星推算出的离子跃迁高度分布
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175152
X.M. Liu, T. Huang, X. Peng
{"title":"Ion transition height distribution deduced from satellite ISS-b","authors":"X.M. Liu, T. Huang, X. Peng","doi":"10.1109/APS.1991.175152","DOIUrl":"https://doi.org/10.1109/APS.1991.175152","url":null,"abstract":"Transition heights deduced from the ISS-b satellite during high solar activity from August 1978 to August 1979 are presented. Contours of average transition height as a function of geographic latitude and longitude in winter and in summer during the same period are shown. It is seen that the major worldwide variation is the change with latitude, and that longitudinal variation is smaller near the equator region.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"9 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":"125558472","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 dihedral corner reflector model for full polarization calibration of RCS measurements RCS测量全偏振定标的二面体角反射镜模型
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174947
K. Sorensen
{"title":"A dihedral corner reflector model for full polarization calibration of RCS measurements","authors":"K. Sorensen","doi":"10.1109/APS.1991.174947","DOIUrl":"https://doi.org/10.1109/APS.1991.174947","url":null,"abstract":"It has generally been stated that the radar cross section (RCS) of a 90 degrees dihedral corner reflector oriented for maximum backscattered return to a radar is given by the expression sigma =8 pi a/sup 2/b/sup 2// lambda /sup 2/. Experimental results are presented which, according to the author, demonstrate that not only does the RCS of a dihedral corner reflector oriented for maximum backscattered return differ significantly from this value, but that high-range-resolution measurements of the dihedral can serve to identify the dominant contributors to the backscattered field. It is noted that inclusion of these backscattered components in an analytical calculation will allow an accurate calibration model to be generated.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"21 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":"115561723","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
Spectral analysis considerations relevant to leaky modes of open-boundary waveguides 与开边界波导漏模有关的光谱分析考虑
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174979
J. M. Grimm, Y. Yuan, D. Nyquist
{"title":"Spectral analysis considerations relevant to leaky modes of open-boundary waveguides","authors":"J. M. Grimm, Y. Yuan, D. Nyquist","doi":"10.1109/APS.1991.174979","DOIUrl":"https://doi.org/10.1109/APS.1991.174979","url":null,"abstract":"The behavior of significant features in the transverse spectral plane for the Sommerfeld-type integrals associated with the open-boundary waveguiding systems is investigated, particularly for the microstrip transmission line in a planar layered background environment. The locations of the integration contour and branch points are chosen to be consistent with continuous physical transitions between operating regimes. The rationale for choosing branch cuts in the transverse spectral plane is given. Pole singularities arising from the layered background surround are then obtained in a manner consistent with the cutting of the transverse spectral plane. Trajectories of the poles and branch points are presented for typical leaky modes.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"283 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":"116089367","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
Time domain analysis of an array of tapered slot antennas 锥形缝隙天线阵列的时域分析
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174868
S. Safavi-Naini, M. Shahabadi
{"title":"Time domain analysis of an array of tapered slot antennas","authors":"S. Safavi-Naini, M. Shahabadi","doi":"10.1109/APS.1991.174868","DOIUrl":"https://doi.org/10.1109/APS.1991.174868","url":null,"abstract":"An efficient time-domain method based upon the combination of transmission line modeling or the finite-difference-time-domain method with an appropriate periodic boundary condition is developed. This technique is successfully applied to the time-domain characterization of a phased array of tapered slots.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"391 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":"123006915","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
Reflection and transmission coefficients of a flat periodical array of magnetic metallic inclusions 磁性金属夹杂平面周期性阵列的反射和透射系数
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175228
J. Sajer
{"title":"Reflection and transmission coefficients of a flat periodical array of magnetic metallic inclusions","authors":"J. Sajer","doi":"10.1109/APS.1991.175228","DOIUrl":"https://doi.org/10.1109/APS.1991.175228","url":null,"abstract":"The author presents a theoretical study of the reflection and transmission coefficients of a flat periodic array of magnetic metallic inclusions. A spectral description of the diffracted fields coupled with a set of boundary conditions written on the top and the bottom of the inclusions is used. This makes it possible to write two equations where the magnetic and electric currents are, first, uncoupled and, second, directly associated respectively with the magnetic and electric incident fields. The solutions are obtained using the Galerkin method. The method shows that the response of a monolayer made of a periodic array of magnetic metallic inclusions (whatever their shapes) is weakly sensitive to the magnetic susceptibility of the inclusions. Nevertheless. the method is sensitive enough to allow one to recover the magnetic response of the composite from the reflection and transmission coefficients by solving the associated inverse problem.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"29 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":"121866127","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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