The shielding characteristics of a multilayer shell shield against internal field initiated by a current loop are examined. Based on electromagnetic theory and a matrix approach, an analytical solution for shielding effectiveness in closed form is presented.<>
{"title":"Matrix analysis approach for multilayer shell shield","authors":"F. Han","doi":"10.1109/APS.1993.385312","DOIUrl":"https://doi.org/10.1109/APS.1993.385312","url":null,"abstract":"The shielding characteristics of a multilayer shell shield against internal field initiated by a current loop are examined. Based on electromagnetic theory and a matrix approach, an analytical solution for shielding effectiveness in closed form is presented.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129815220","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}
A four-point fed radial line planar antenna (RLPA) array which has the capability of monopulse tracking operation is proposed. A simple analytical model which describes the performance of the array is presented. A four-point fed radial line power divider which has 90 output port probes was fabricated. Sum and difference patterns evaluated from the measured transmission amplitude and phase data are shown verifying the capability of the four-point fed RLPA for monopulse tracking operation.<>
{"title":"Four-point fed radial line planar antenna array for monopulse tracking operation","authors":"H. Miyashita, T. Katagi","doi":"10.1109/APS.1993.385384","DOIUrl":"https://doi.org/10.1109/APS.1993.385384","url":null,"abstract":"A four-point fed radial line planar antenna (RLPA) array which has the capability of monopulse tracking operation is proposed. A simple analytical model which describes the performance of the array is presented. A four-point fed radial line power divider which has 90 output port probes was fabricated. Sum and difference patterns evaluated from the measured transmission amplitude and phase data are shown verifying the capability of the four-point fed RLPA for monopulse tracking operation.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"2009 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127334936","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}
The conjugate gradient method combined with the fast Fourier transform (CG-FFT) is a suitable approach for large scatterers and radiating systems. The uniform sampling scheme, widely used in current applications, requires memory storage and computational complexity which increase very rapidly with the desired accuracy. In this work, to circumvent this difficulty for the case of large structures with localized isolated discontinuities, where higher accuracy (resolution) is required only over some specific parts, a nonuniform sampling scheme is presented. Although the proposed approach is more general, its application to Pocklington's equation is investigated here. The CG-FFT method for uniform sampling is applied to the radiation and scattering problem of a straight wire antenna, for a wide range of lengths.<>
{"title":"A CG-FFT method with nonuniform sampling for Pocklington's equation","authors":"A. Banihashemi, S. Safavi-Naeini","doi":"10.1109/APS.1993.385398","DOIUrl":"https://doi.org/10.1109/APS.1993.385398","url":null,"abstract":"The conjugate gradient method combined with the fast Fourier transform (CG-FFT) is a suitable approach for large scatterers and radiating systems. The uniform sampling scheme, widely used in current applications, requires memory storage and computational complexity which increase very rapidly with the desired accuracy. In this work, to circumvent this difficulty for the case of large structures with localized isolated discontinuities, where higher accuracy (resolution) is required only over some specific parts, a nonuniform sampling scheme is presented. Although the proposed approach is more general, its application to Pocklington's equation is investigated here. The CG-FFT method for uniform sampling is applied to the radiation and scattering problem of a straight wire antenna, for a wide range of lengths.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129946360","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}
The authors present the results of a unified formulation capable of modeling many different loop geometries, including circular, square, and folded dipole configurations, through the use of the superquadric curve. The methodology allows analysis of a single superquadric element or of two loops with arbitrary relative position and orientation and possibly different geometries. A Galerkin-type moment method with piecewise sinusoidal basis and weighting functions is used to solve a coupled form of the electric field integral equation (EFIE) for thin wires. The current obtained from this solution is then used to compute the directivity, input impedance, and correlation coefficient (diversity performance) for the antenna configuration. Both delta gap and magnetic frill source models are implemented in the formulation.<>
{"title":"Characteristics of superquadric loop antennas for mobile communications applications","authors":"M. Jensen, Y. Rahmat-Samii","doi":"10.1109/APS.1993.385381","DOIUrl":"https://doi.org/10.1109/APS.1993.385381","url":null,"abstract":"The authors present the results of a unified formulation capable of modeling many different loop geometries, including circular, square, and folded dipole configurations, through the use of the superquadric curve. The methodology allows analysis of a single superquadric element or of two loops with arbitrary relative position and orientation and possibly different geometries. A Galerkin-type moment method with piecewise sinusoidal basis and weighting functions is used to solve a coupled form of the electric field integral equation (EFIE) for thin wires. The current obtained from this solution is then used to compute the directivity, input impedance, and correlation coefficient (diversity performance) for the antenna configuration. Both delta gap and magnetic frill source models are implemented in the formulation.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126962931","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}
The resonator structure is divided into interior and exterior regions. For the interior region, the standard 2-D Okoshi formulation of magnetic current (electric voltage) on the patch perimeter is used. For the exterior region, a 3-D complex image formulation of magnetic current is used. The tangential electric and magnetic fields of the exterior and interior formulations are then matched over the patch perimeter to form a moment method matrix equations. Numerical results are provided for rectangular and circular patch resonators of direct microstrip feed over a wide frequency range. These numerical examples demonstrate the versatility, speed, and accuracy of the method.<>
{"title":"A combined complex image and contour integral method for rapid solution of patch resonators","authors":"A. A. Omar, Y. Chow","doi":"10.1109/APS.1993.385137","DOIUrl":"https://doi.org/10.1109/APS.1993.385137","url":null,"abstract":"The resonator structure is divided into interior and exterior regions. For the interior region, the standard 2-D Okoshi formulation of magnetic current (electric voltage) on the patch perimeter is used. For the exterior region, a 3-D complex image formulation of magnetic current is used. The tangential electric and magnetic fields of the exterior and interior formulations are then matched over the patch perimeter to form a moment method matrix equations. Numerical results are provided for rectangular and circular patch resonators of direct microstrip feed over a wide frequency range. These numerical examples demonstrate the versatility, speed, and accuracy of the method.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130613842","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}
Accurately resolving features that are small with regard to the basic spatial cell used throughout a finite-difference time-domain (FDTD) code has been of interest for the past 10 to 15 years. An examination of the layer problem is provided. There are numerous cases that require a rigorous analysis of the field behavior within the material. Obvious important examples include coatings designed to trap waves for stealth applications and propagation within multilayer circuit boards. These cases are examined here using an orthogonal, locally nonuniform mesh embedded within a uniform mesh based on the Yee formulation. The specific applications considered are the Salisbury screen and crosstalk on printed-circuit boards.<>
{"title":"Locally non-uniform FDTD with application to low observables and crosstalk","authors":"D. Riley","doi":"10.1109/APS.1993.385410","DOIUrl":"https://doi.org/10.1109/APS.1993.385410","url":null,"abstract":"Accurately resolving features that are small with regard to the basic spatial cell used throughout a finite-difference time-domain (FDTD) code has been of interest for the past 10 to 15 years. An examination of the layer problem is provided. There are numerous cases that require a rigorous analysis of the field behavior within the material. Obvious important examples include coatings designed to trap waves for stealth applications and propagation within multilayer circuit boards. These cases are examined here using an orthogonal, locally nonuniform mesh embedded within a uniform mesh based on the Yee formulation. The specific applications considered are the Salisbury screen and crosstalk on printed-circuit boards.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130707093","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}
The StratEdge process, an advanced ceramic packaging technology based on the lamination of fully fired ceramics using a set of proprietary glass compounds and compatible metallizations is described. It combines both innovative and mature processing techniques with new material sets. The process has yielded superior results with respect to electrical, structural, and hermetic performance. The technology is affordable, suitable for high volume production, and does not require customized equipment. To illustrate these considerations, two simple examples of a microwave and a millimeter wave package are presented. A basic DC-20 GHz broadband microwave package is illustrated. The goal of the package is to be electrically transparent to the die and to provide thermal dissipation while maintaining a hermetic and environmentally compatible enclosure. A package that is being developed to address millimeter-wave requirements is also presented.<>
{"title":"Advanced ceramic packaging for microwave and millimeter wave applications","authors":"D. Wein","doi":"10.1109/APS.1993.385182","DOIUrl":"https://doi.org/10.1109/APS.1993.385182","url":null,"abstract":"The StratEdge process, an advanced ceramic packaging technology based on the lamination of fully fired ceramics using a set of proprietary glass compounds and compatible metallizations is described. It combines both innovative and mature processing techniques with new material sets. The process has yielded superior results with respect to electrical, structural, and hermetic performance. The technology is affordable, suitable for high volume production, and does not require customized equipment. To illustrate these considerations, two simple examples of a microwave and a millimeter wave package are presented. A basic DC-20 GHz broadband microwave package is illustrated. The goal of the package is to be electrically transparent to the die and to provide thermal dissipation while maintaining a hermetic and environmentally compatible enclosure. A package that is being developed to address millimeter-wave requirements is also presented.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130399331","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}
The authors present the analysis of the aperture distributions corresponding to a desired shaped beam by the synthesis of Gaussian beams. An advantage of Gaussian beams is that the field distribution in the beam waist and its near plane can be easily obtained. Numerical results on the aperture fields for shaped beam antennas are shown.<>
{"title":"Analysis of aperture fields for shaped beam antennas by use of Gaussian beams","authors":"M. Mizusawa, T. Fukui, T. Yamaguchi, Y. Okumura","doi":"10.1109/APS.1993.385340","DOIUrl":"https://doi.org/10.1109/APS.1993.385340","url":null,"abstract":"The authors present the analysis of the aperture distributions corresponding to a desired shaped beam by the synthesis of Gaussian beams. An advantage of Gaussian beams is that the field distribution in the beam waist and its near plane can be easily obtained. Numerical results on the aperture fields for shaped beam antennas are shown.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127891419","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}
A low-profile balun approach is described which is a modified version of the proven exponential tapered balun, capturing its inherent broadband, low-cost characteristics in a compact package. This approach provides a broadband antenna with coaxial connectors suitable for low-profile skin mounting. It may also be used with conventional cavity-backed antennas. Implementation methods apply to single- and dual-polarized apertures. Hardware design configurations and preliminary test data voltage standing wave ratios are given.<>
{"title":"A low-profile, broadband balun feed","authors":"D. Hofer, V. Tripp","doi":"10.1109/APS.1993.385308","DOIUrl":"https://doi.org/10.1109/APS.1993.385308","url":null,"abstract":"A low-profile balun approach is described which is a modified version of the proven exponential tapered balun, capturing its inherent broadband, low-cost characteristics in a compact package. This approach provides a broadband antenna with coaxial connectors suitable for low-profile skin mounting. It may also be used with conventional cavity-backed antennas. Implementation methods apply to single- and dual-polarized apertures. Hardware design configurations and preliminary test data voltage standing wave ratios are given.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128798156","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}
It is demonstrated that the difference in spatial spectra for coherent and incoherent scattering SAR (synthetic aperture radar) data can be used as a mechanism to separate the specular reflection and coherent edge diffraction from the signals due to surface scatterers. A spatial-spectral filter is thus designed to make use of this property and applied to process synthetic as well as measured SAR data. A one-dimensional surface image is constructed from the filtered SAR data with a standard matched filter.<>
{"title":"Microwave imaging for features on metallic surface with synthetic aperture radar","authors":"H. Han, M. Lusk","doi":"10.1109/APS.1993.385582","DOIUrl":"https://doi.org/10.1109/APS.1993.385582","url":null,"abstract":"It is demonstrated that the difference in spatial spectra for coherent and incoherent scattering SAR (synthetic aperture radar) data can be used as a mechanism to separate the specular reflection and coherent edge diffraction from the signals due to surface scatterers. A spatial-spectral filter is thus designed to make use of this property and applied to process synthetic as well as measured SAR data. A one-dimensional surface image is constructed from the filtered SAR data with a standard matched filter.<<ETX>>","PeriodicalId":138141,"journal":{"name":"Proceedings of IEEE Antennas and Propagation Society International Symposium","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125401737","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}
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