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

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A comparison of the CG-FFT method and the recursive aggregate T-matrix algorithm (EM wave scattering) CG-FFT方法与递归聚合t矩阵算法(电磁波散射)的比较
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221732
Lin Jiun-Hwa, W. Chew
{"title":"A comparison of the CG-FFT method and the recursive aggregate T-matrix algorithm (EM wave scattering)","authors":"Lin Jiun-Hwa, W. Chew","doi":"10.1109/APS.1992.221732","DOIUrl":"https://doi.org/10.1109/APS.1992.221732","url":null,"abstract":"A comparison of the computing performances of the conjugate-gradient fast Fourier transform (CG-FFT) method and the recursive aggregate T-matrix algorithm (RATMA) is presented. The advantages of each method are discussed. It is shown that, when the biconjugate CG-FET (BiCG-FFT) works, even for lossless cases, its CPU time performance is quite comparable with RATMA. Since the FFT is a highly vectorizable scheme, implementation of CG-FET or BiCG-FFT on a parallel processing machine will increase the efficiency and save much computing time. However, that this is only for a single incidence angle. If different incident fields are considered, one needs to go through the whole process again for CGM or BiCGM. However, RATMA is valid for any incident field from any angle.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"4 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":"127411798","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
Analysis and computation of circular aperture arrays with multi-step amplitude quantization 多阶振幅量化圆孔径阵列的分析与计算
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221899
Fengzhang Xue, Yanchang Guo, Nenghang Fang
{"title":"Analysis and computation of circular aperture arrays with multi-step amplitude quantization","authors":"Fengzhang Xue, Yanchang Guo, Nenghang Fang","doi":"10.1109/APS.1992.221899","DOIUrl":"https://doi.org/10.1109/APS.1992.221899","url":null,"abstract":"The idea of multistep amplitude quantization for circular aperture arrays is proposed to reduce the peak sidelobe level (SLL). Formulas are derived for multistep amplitude quantization, and some computer results are presented to verify the theory. It is shown that the circular aperture arrays with multistep amplitude quantization can reduce the peak SLL efficiently. With four-step amplitude coefficients in an array of about 800 elements, a maximum SLL of -35.1 dB is obtained in all cuts. The peak SLL will have a reduction of about 2 dB when the total number of elements in the array is doubled.<<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":"130087512","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
Finite-difference time-domain simulations of linear integrated photonic devices 线性集成光子器件的时域有限差分模拟
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221950
R. Hawkins, R. Mcleod
{"title":"Finite-difference time-domain simulations of linear integrated photonic devices","authors":"R. Hawkins, R. Mcleod","doi":"10.1109/APS.1992.221950","DOIUrl":"https://doi.org/10.1109/APS.1992.221950","url":null,"abstract":"Summary form only given. The authors discuss the finite-difference time-domain (FDTD) method in integrated optics design. With this versatile technique one is able to predict the broadband behavior of geometrically complex optical interconnects. The ability to accurately treat coherent effects, reflections, and wide spectral variations in material properties has made the study of grating-based devices and other complex structures a comparatively straightforward task. It is found that the FDTD method gives designers insight only revealed by complete vector electromagnetic fields. Combining the FDTD algorithm with graphical preprocessing and postprocessing tools can lend new insight into simple problems, such as couplers and gratings, and provide valuable information on the operation of proposed hardware.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"30 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":"129055961","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
Optimal far field estimation from near zone measurements 从近区测量获得最佳远场估计
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221743
O. Bucci, G. D'Elia, G. Leone
{"title":"Optimal far field estimation from near zone measurements","authors":"O. Bucci, G. D'Elia, G. Leone","doi":"10.1109/APS.1992.221743","DOIUrl":"https://doi.org/10.1109/APS.1992.221743","url":null,"abstract":"The accurate determination of the field radiated by modern high-performance antennas is often accomplished by means of a near-field-far-field transformation technique (NF-FF), in order to exploit the advantages of an indoor, highly noiseless measurement setup. The objective of any NF-FF algorithm must be the optimal estimate of the far field, i.e. the estimate corresponding to the minimum reconstruction error compatible with the incomplete and corrupted measured data and the available information. The optimal NF-FF algorithm also minimizes the number of measurements and the computational effort, making it possible to account for the probe effect without additional computational complexity. Moreover, it should not be connected to a particular scanning surface, in order that positioning error can be easily accounted for. As an example, the evaluation of the far field of a planar array of 21*21 x-oriented electrical dipoles, in the z=0 plane, spaced lambda /2 apart and directed along x is considered.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"1 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":"130677686","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
FD-TD analysis of electromagnetic wave radiation pattern of aperture and horn antennas 孔径天线和喇叭天线电磁波辐射方向图的FD-TD分析
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221530
Qi Zhang, D. Choi
{"title":"FD-TD analysis of electromagnetic wave radiation pattern of aperture and horn antennas","authors":"Qi Zhang, D. Choi","doi":"10.1109/APS.1992.221530","DOIUrl":"https://doi.org/10.1109/APS.1992.221530","url":null,"abstract":"The authors describe the numerical error caused by the finite mesh size of the FD-TD (finite-difference time-domain) algorithm in far-field radiation pattern study. It is demonstrated that numerical dispersion of the FD-TD method causes the overall shape of the radiation pattern to be shifted to the diagonal direction of the FD-TD mesh. In the numerical simulation of the aperture and horn antenna, the amount of this shift can be predicted, and it has been confirmed by the numerical results. Based on a comparison between the theoretical and predicted results, a simple algorithm was developed to improve the accuracy of the numerical results. The algorithm described should be useful for applications of the FD-TD method to wave propagation problems.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"1 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":"130732558","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 critical look at photonics for phased array systems 相控阵系统光子学的关键研究
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221836
D. Curtis, R. Mailloux
{"title":"A critical look at photonics for phased array systems","authors":"D. Curtis, R. Mailloux","doi":"10.1109/APS.1992.221836","DOIUrl":"https://doi.org/10.1109/APS.1992.221836","url":null,"abstract":"Summary form only given. It is noted that photonics has some advantages that assure it a place in array control. In digital control signal distribution and RF power distribution, one can expect to see early applications of photonic technology. Control signal distribution complicates present-day arrays, and is a relatively simple function to do photonically. RF signal distribution using photonics can, in principle, have the required accuracy, but losses in modulation and detection will require its use with solid-state modules. The cost and reduction in dynamic range may limit this application for some systems. The use of photonics to provide time delay has great potential for wideband arrays, but is not without competition from digital beamforming systems, and does not readily admit to adaptive control.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"12 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":"130778653","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 hybrid approach for 2-D RCS imaging 二维RCS成像的混合方法
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221572
M.M. Giray, S. Mishra
{"title":"A hybrid approach for 2-D RCS imaging","authors":"M.M. Giray, S. Mishra","doi":"10.1109/APS.1992.221572","DOIUrl":"https://doi.org/10.1109/APS.1992.221572","url":null,"abstract":"The use of a hybrid 2-D spectral analysis method in RCS (radar cross section) imaging is presented. The hybrid scheme uses the standard FFT (fast Fourier transform) technique and the super resolution MUSIC algorithm subsequently to form the 2-D image. This approach can have the advantage of improving the resolution in the dimension where short data records are available. This hybrid approach was applied to the 2-D RCS analysis of a cube. The results are given for the case where the RCS data over an aspect angle of 10 degrees are considered. They indicate that by using the hybrid scheme, the scattering centers associated with the target are resolved as expected, whereas the standard 2-D FFT algorithm failed to identify the scattering centers.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"107 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":"132380039","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 spectral method for the analysis of arbitrary multilayer microstrip configurations 一种分析任意多层微带结构的光谱方法
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221543
J. Basterrechea, M. Cátedra
{"title":"A spectral method for the analysis of arbitrary multilayer microstrip configurations","authors":"J. Basterrechea, M. Cátedra","doi":"10.1109/APS.1992.221543","DOIUrl":"https://doi.org/10.1109/APS.1992.221543","url":null,"abstract":"An extension of the conjugate gradient (CG) method in combination with the fast Fourier transform (FFT) for the analysis of open multilayer structures is presented. Several improvements (feeding method, loading system, new basis functions for the currents) to a previous scheme have been included in the analysis method. The scheme is applied to obtain the S parameters of several structures. Results are successfully compared with experimental data from other authors. The method appears accurate and efficient. Apart from taking advantage of the memory requirements of the CG-FFT scheme the proposed method increases the speed of convergence of the same by using new basis functions.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"7 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":"132442221","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 hexagonal slot-coupled CP patch array with an integrated filter 带集成滤波器的六边形槽耦合CP贴片阵列
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221984
C.H. Chen, W. C. Wong, S. Hamada
{"title":"A hexagonal slot-coupled CP patch array with an integrated filter","authors":"C.H. Chen, W. C. Wong, S. Hamada","doi":"10.1109/APS.1992.221984","DOIUrl":"https://doi.org/10.1109/APS.1992.221984","url":null,"abstract":"The authors describe the implementation of a seven-element CP array using slot-coupled patches. The approach used results in an array structure that has low profile and light weight and is very simple to fabricate without any coaxial feedthrough. Because the feed circuit is etched on a separated layer, space is available for other circuits, such as filters, amplifiers, and phase shifters. This array can therefore be an active module. A breadboard model was designed, fabricated, and tested. Excellent measured results were obtained.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"47 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":"132279284","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
Radar cross section computation and visualization by shooting-and-bouncing ray (SBR) technique 基于射弹技术的雷达截面计算与可视化
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221753
C.L. Yu, S. Lee
{"title":"Radar cross section computation and visualization by shooting-and-bouncing ray (SBR) technique","authors":"C.L. Yu, S. Lee","doi":"10.1109/APS.1992.221753","DOIUrl":"https://doi.org/10.1109/APS.1992.221753","url":null,"abstract":"An effort is being made to develop an analysis model with sophisticated graphic capability for analyzing and visualizing the electromagnetic scattering from a complex radar target. This analytical model uses a hybrid technique of the shooting and bouncing ray (SBR) method and the physical theory of diffraction. Coupled with computer-aided design graphics, the model provides a capability for visualizing, analyzing, and interpreting the complex radar scattering phenomena via dynamic ray-picture displays on a computer graphic terminal. With its sophisticated ability to rapidly conduct visual diagnostic studies of radar scattering sources and multiple reflections from a complex target, the SBR model provides an efficient and cost-effective way of performing many practical RCS (radar cross section) analysis, design, and reduction applications that may not have been feasible in the past. In addition, this method can be used to complement experimental measurements in maintaining the quality assurance of the test data measured.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"1 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":"130956662","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: 14
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