Pub Date : 1986-09-01DOI: 10.1109/APS.1986.1149759
R. Elliott, W. O'Loughlin
Improved slot array performance (lower side lobe levels, a better input match) calls for elimination of approximations in earlier design procedures. One important change is to include internal higher order mode coupling. That has been done and is found to cause a simple but significant modification in existing design formulas.
{"title":"The design of slot arrays including internal mutual coupling","authors":"R. Elliott, W. O'Loughlin","doi":"10.1109/APS.1986.1149759","DOIUrl":"https://doi.org/10.1109/APS.1986.1149759","url":null,"abstract":"Improved slot array performance (lower side lobe levels, a better input match) calls for elimination of approximations in earlier design procedures. One important change is to include internal higher order mode coupling. That has been done and is found to cause a simple but significant modification in existing design formulas.","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125568897","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149784
D. Peplinski, C. Balanis, S. Brumley
The backscattering from a circular disk is analyzed using the geometrical theory of diffraction (GTD). First-, second-, and third-order diffractions are included in the hard polarization analysis, while first-, second-, and second-order slope diffractions are included for soft polarization. Improvements in the prediction of the monostatic radar cross section (RCS) over previous works are noted. For hard polarization, an excellent agreement is exhibited between experimental and theoretical results, while a very good agreement is noted for soft polarization. To further improve the soft polarization results for wide angles, a model for the creeping wave or circulating current on the edge of the disk is obtained and used to find an additional component of the backscattered field. The addition of this component significantly improves the results for wide angles, leading to excellent agreement for soft polarization also. An axial-caustic correction method using equivalent currents is also included in the analysis.
{"title":"Higher order diffractions from a circular disk","authors":"D. Peplinski, C. Balanis, S. Brumley","doi":"10.1109/APS.1986.1149784","DOIUrl":"https://doi.org/10.1109/APS.1986.1149784","url":null,"abstract":"The backscattering from a circular disk is analyzed using the geometrical theory of diffraction (GTD). First-, second-, and third-order diffractions are included in the hard polarization analysis, while first-, second-, and second-order slope diffractions are included for soft polarization. Improvements in the prediction of the monostatic radar cross section (RCS) over previous works are noted. For hard polarization, an excellent agreement is exhibited between experimental and theoretical results, while a very good agreement is noted for soft polarization. To further improve the soft polarization results for wide angles, a model for the creeping wave or circulating current on the edge of the disk is obtained and used to find an additional component of the backscattered field. The addition of this component significantly improves the results for wide angles, leading to excellent agreement for soft polarization also. An axial-caustic correction method using equivalent currents is also included in the analysis.","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115569698","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149825
R. Haupt, V. Liepa
This paper investigates the validity of applying PO to 6nd the currents induced on a nsistive strip by an incident plane wavc Prim in~e~tigations did not coneider PO aa a viable method. %or and Liepa obtained the currents induced in resistive strip by &ng the method of momenta (MOM)[l]. More recently, Ray and Mittra used the spectral iterakive technique to 6nd the -nrS in such ntrips[2]. In these two studies the atrip either had a uniform or a tapered resistivity. In thio study currents on strips having vations reSisrMtim were computed ming MOM and PO expresaom. The results indicate that PO provides simple, =curate upressiono for the current when the resistiviw on the strip haa a smooth taper with large valuea of reeistance at the edges.
{"title":"The validity of approximation currents on a resistive strip using physical optics","authors":"R. Haupt, V. Liepa","doi":"10.1109/APS.1986.1149825","DOIUrl":"https://doi.org/10.1109/APS.1986.1149825","url":null,"abstract":"This paper investigates the validity of applying PO to 6nd the currents induced on a nsistive strip by an incident plane wavc Prim in~e~tigations did not coneider PO aa a viable method. %or and Liepa obtained the currents induced in resistive strip by &ng the method of momenta (MOM)[l]. More recently, Ray and Mittra used the spectral iterakive technique to 6nd the -nrS in such ntrips[2]. In these two studies the atrip either had a uniform or a tapered resistivity. In thio study currents on strips having vations reSisrMtim were computed ming MOM and PO expresaom. The results indicate that PO provides simple, =curate upressiono for the current when the resistiviw on the strip haa a smooth taper with large valuea of reeistance at the edges.","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123029855","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149573
Y. Loh
The first parabolic reflector Rl i s in the Fresnel (near) field of the feedhorn. Also, the second reflector RZ current-intogration (POICII formulation for noar field, the is in the near field of the R1. Using physical-optics currents induced on R1 and RZ may be computed. The radiation pattern exit from R2 is then calculated. This rnehod, though Capable of producing proper esults, is extrcmely time-consuming and costly.
{"title":"Beam waveguide efficiency analysis","authors":"Y. Loh","doi":"10.1109/APS.1986.1149573","DOIUrl":"https://doi.org/10.1109/APS.1986.1149573","url":null,"abstract":"The first parabolic reflector Rl i s in the Fresnel (near) field of the feedhorn. Also, the second reflector RZ current-intogration (POICII formulation for noar field, the is in the near field of the R1. Using physical-optics currents induced on R1 and RZ may be computed. The radiation pattern exit from R2 is then calculated. This rnehod, though Capable of producing proper esults, is extrcmely time-consuming and costly.","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117077505","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149761
B. Cown, R. Cravey, C. Papanicolopulos
{"title":"Analysis of near-field antenna coupling and diffraction via spherical angular functions","authors":"B. Cown, R. Cravey, C. Papanicolopulos","doi":"10.1109/APS.1986.1149761","DOIUrl":"https://doi.org/10.1109/APS.1986.1149761","url":null,"abstract":"","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129504933","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149802
R. Hall, R. Mittra
{"title":"Scattering from complex periodic structures comprised of resistive strips","authors":"R. Hall, R. Mittra","doi":"10.1109/APS.1986.1149802","DOIUrl":"https://doi.org/10.1109/APS.1986.1149802","url":null,"abstract":"","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129268338","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149815
T. Griesser, C. Balanis
integrations generally cannot be performed in closed form, and numerical integrations may be necessary. The analysis becomes nuch more difficult to formulate for general objects. The formulation for finding the double reflected field begins by first determining the physical optics current on the first surface due to the incident tangential magnetic field. The vector potential due to this current can be used to find the fields induced in all space. At another conducting surface, the reflected field is used to determine the physical optics current density due to the first reflection. The vector potential due to this second reflection can be found by a surface integration over the second conducting surface. The reflected fields, which contribute to the total backscatter cross section, can then be found using the far-field approximation. When adding higher order reflections, however, the surface
{"title":"Double reflections in the physical theory of diffraction","authors":"T. Griesser, C. Balanis","doi":"10.1109/APS.1986.1149815","DOIUrl":"https://doi.org/10.1109/APS.1986.1149815","url":null,"abstract":"integrations generally cannot be performed in closed form, and numerical integrations may be necessary. The analysis becomes nuch more difficult to formulate for general objects. The formulation for finding the double reflected field begins by first determining the physical optics current on the first surface due to the incident tangential magnetic field. The vector potential due to this current can be used to find the fields induced in all space. At another conducting surface, the reflected field is used to determine the physical optics current density due to the first reflection. The vector potential due to this second reflection can be found by a surface integration over the second conducting surface. The reflected fields, which contribute to the total backscatter cross section, can then be found using the far-field approximation. When adding higher order reflections, however, the surface","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123864353","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149787
C. Su, Shi-ming Lin
{"title":"A method for locating defective elements in the large planar array","authors":"C. Su, Shi-ming Lin","doi":"10.1109/APS.1986.1149787","DOIUrl":"https://doi.org/10.1109/APS.1986.1149787","url":null,"abstract":"","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123888315","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149692
R. Capone, E. Pelacà
A towerless dual of f -set antenna conf igura t ion w i th c ross-po la r compensation and good scanning performances was anaTyzed f o r a mult ibeam reconfigurable antenna app l ica t ion , on-board a european mul t iserv ice comrmnicat ion sate l l i te . The antenna e l e c t r i cal perfonnances were canpared w i th t hose o f a compensated Standard Cassegrain arrangement. -----
{"title":"Advanced satellite multifeed reconfigurable antenna with very good cross-polar and scan performances","authors":"R. Capone, E. Pelacà","doi":"10.1109/APS.1986.1149692","DOIUrl":"https://doi.org/10.1109/APS.1986.1149692","url":null,"abstract":"A towerless dual of f -set antenna conf igura t ion w i th c ross-po la r compensation and good scanning performances was anaTyzed f o r a mult ibeam reconfigurable antenna app l ica t ion , on-board a european mul t iserv ice comrmnicat ion sate l l i te . The antenna e l e c t r i cal perfonnances were canpared w i th t hose o f a compensated Standard Cassegrain arrangement. -----","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114539468","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}
Pub Date : 1986-06-08DOI: 10.1109/APS.1986.1149666
D. Misra
{"title":"Application of personal computers in transmission line impedance problems","authors":"D. Misra","doi":"10.1109/APS.1986.1149666","DOIUrl":"https://doi.org/10.1109/APS.1986.1149666","url":null,"abstract":"","PeriodicalId":399329,"journal":{"name":"1986 Antennas and Propagation Society International Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116281685","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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