Pub Date : 1900-01-01DOI: 10.1109/IRETAP.1956.6366294
E. Jones, T. Morita, S. B. Cohnf
Two microwave lenses whose surfaces have been matched respectively by embedded capacitive walls and by simulated quarter-wave transformers were built and compared experimentally to an unmatched lens of identical aperture and focal length. At the design frequency, the matched lenses exhibited reductions in side-lobe level of 14 and 10 db with respect to the unmatched lens, and increases in over-all gain of 0.35 and 0.1 db. The input vswr of the feed horn was reduced from 1.6 for the unmatched case to 1.02 and 1.05 for the matched cases. The bandwidth of good performance for the two lenses ranged from lö per cent to at least 44 per cent
{"title":"Measured performance of matched dielectric lenses","authors":"E. Jones, T. Morita, S. B. Cohnf","doi":"10.1109/IRETAP.1956.6366294","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366294","url":null,"abstract":"Two microwave lenses whose surfaces have been matched respectively by embedded capacitive walls and by simulated quarter-wave transformers were built and compared experimentally to an unmatched lens of identical aperture and focal length. At the design frequency, the matched lenses exhibited reductions in side-lobe level of 14 and 10 db with respect to the unmatched lens, and increases in over-all gain of 0.35 and 0.1 db. The input vswr of the feed horn was reduced from 1.6 for the unmatched case to 1.02 and 1.05 for the matched cases. The bandwidth of good performance for the two lenses ranged from lö per cent to at least 44 per cent","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114958187","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 : 1900-01-01DOI: 10.1109/TAP.1962.1137807
H. Raemer
{"title":"Radiation from linear electric or magnetic antennas surrounded by a spherical plasma shell","authors":"H. Raemer","doi":"10.1109/TAP.1962.1137807","DOIUrl":"https://doi.org/10.1109/TAP.1962.1137807","url":null,"abstract":"","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129588920","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 : 1900-01-01DOI: 10.1109/IRETAP.1956.6366298
P. N. Mathur, E. Mueller
Studies were made of the scattering of electromagnetic waves from nonspherical targets by making exact determination of the nose-on radar back-scattering cross sections of conducting prolate spheroids of various sizes and shapes. Curves are given for the back-scattered cross sections as a function of dimensionless size and shape parameters for prolate spheroids. The results are compared with the Rayleigh-Gans first order approximation and Stevenson's third-order approximation, and the range of applicability of these approximations is evaluated.
{"title":"Radar back-scattering cross sections for nonspherical targets","authors":"P. N. Mathur, E. Mueller","doi":"10.1109/IRETAP.1956.6366298","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366298","url":null,"abstract":"Studies were made of the scattering of electromagnetic waves from nonspherical targets by making exact determination of the nose-on radar back-scattering cross sections of conducting prolate spheroids of various sizes and shapes. Curves are given for the back-scattered cross sections as a function of dimensionless size and shape parameters for prolate spheroids. The results are compared with the Rayleigh-Gans first order approximation and Stevenson's third-order approximation, and the range of applicability of these approximations is evaluated.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132016233","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 : 1900-01-01DOI: 10.1109/TAP.1957.1144483
G. Marconi
{"title":"Radio communications by means of very short electric waves","authors":"G. Marconi","doi":"10.1109/TAP.1957.1144483","DOIUrl":"https://doi.org/10.1109/TAP.1957.1144483","url":null,"abstract":"","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122919584","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 : 1900-01-01DOI: 10.1109/IRETAP.1956.6366291
L. Felsen
The pattern in a half-space of a slot in the wall of a waveguide is a function of the terminating impedance. The description of the far fields in such a configuration is simplified considerably by the adoption of a network viewpoint, whereby the half-space is represented approximately by two (or more) spherical transmission lines, the feeding waveguide by a single uniform transmission line, and the slot by a coupling network which is directly analogous to that for a hybrid junction. For a given waveguide termination, the spherical mode voltages are computed by a simple network calculation, and the gain pattern is obtained by modal synthesis. The slot equivalent circuit parameters are obtained readily by simple measurements or from available theoretical formulas. Described in detail both theoretically and experimentally is a symmetric rectangular slot cut in either the broad or narrow face of a rectangular waveguide.
{"title":"Analysis of a terminated-waveguide slot antenna by an equivalent circuit method","authors":"L. Felsen","doi":"10.1109/IRETAP.1956.6366291","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366291","url":null,"abstract":"The pattern in a half-space of a slot in the wall of a waveguide is a function of the terminating impedance. The description of the far fields in such a configuration is simplified considerably by the adoption of a network viewpoint, whereby the half-space is represented approximately by two (or more) spherical transmission lines, the feeding waveguide by a single uniform transmission line, and the slot by a coupling network which is directly analogous to that for a hybrid junction. For a given waveguide termination, the spherical mode voltages are computed by a simple network calculation, and the gain pattern is obtained by modal synthesis. The slot equivalent circuit parameters are obtained readily by simple measurements or from available theoretical formulas. Described in detail both theoretically and experimentally is a symmetric rectangular slot cut in either the broad or narrow face of a rectangular waveguide.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117103570","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 : 1900-01-01DOI: 10.1109/iretap.1956.6366308
A SYMPOSIUM on Normal Mode Theory was convened, under the chairmanship of Dr. S. A. Schelkunoff, at the Navy Electronics Laboratory on July 5, 6, and 7, 1955. This symposium consisted of an informal trip to Palomar Mountain on July 5 and a round-table discussion on July 6-7 for the purpose of exchanging ideas about the present state of theoretical knowledge of wave propagation through stratified media, the known methods of attack, and the outstanding unanswered questions. Although the emphasis was on normal mode theory, the possibility of extending the ray theory of physical optics was explored. The following list of topics was on the agenda:
1955年7月5日、6日和7日，在海军电子实验室召开了一次关于正模理论的研讨会，由S. A. Schelkunoff博士主持。本次研讨会包括7月5日对帕洛玛山的非正式访问和7月6日至7日的圆桌讨论，目的是就波通过分层介质传播的理论知识的现状、已知的攻击方法和悬而未决的问题交换意见。虽然重点是正模理论，但也探讨了扩展物理光学射线理论的可能性。议程上的议题清单如下:
{"title":"Summary of normal mode theory symposium","authors":"","doi":"10.1109/iretap.1956.6366308","DOIUrl":"https://doi.org/10.1109/iretap.1956.6366308","url":null,"abstract":"A SYMPOSIUM on Normal Mode Theory was convened, under the chairmanship of Dr. S. A. Schelkunoff, at the Navy Electronics Laboratory on July 5, 6, and 7, 1955. This symposium consisted of an informal trip to Palomar Mountain on July 5 and a round-table discussion on July 6-7 for the purpose of exchanging ideas about the present state of theoretical knowledge of wave propagation through stratified media, the known methods of attack, and the outstanding unanswered questions. Although the emphasis was on normal mode theory, the possibility of extending the ray theory of physical optics was explored. The following list of topics was on the agenda:","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127327536","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 : 1900-01-01DOI: 10.1109/IRETAP.1956.6366297
J. Wait, M. O'Grady
The distribution of surface current density on a perfectly conducting half-plane excited by an infinite axial slot is determined. The slot is assumed to be of small width and it is excited throughout its length by a uniform transverse voltage. It is shown that the surface currents which flow toward the edge of the half-plane are somewhat smaller than they would be if they were on an infinite plane. For sake of comparison the surface currents of an infinite axial slot on a thin elliptic cylinder or ribbon are also examined
{"title":"Surface currents excited by an infinite slot on half-planes and ribbons","authors":"J. Wait, M. O'Grady","doi":"10.1109/IRETAP.1956.6366297","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366297","url":null,"abstract":"The distribution of surface current density on a perfectly conducting half-plane excited by an infinite axial slot is determined. The slot is assumed to be of small width and it is excited throughout its length by a uniform transverse voltage. It is shown that the surface currents which flow toward the edge of the half-plane are somewhat smaller than they would be if they were on an infinite plane. For sake of comparison the surface currents of an infinite axial slot on a thin elliptic cylinder or ribbon are also examined","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124047978","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 : 1900-01-01DOI: 10.1109/IRETAP.1956.6366304
R. Kirby, F. Capps
A study has been made of the correlation in transmission loss observed over irregular-terrain paths. Simultaneous mobile measurements were made of two pairs of VHF broadcasting stations in the Washington, D. C-Baltimore, Maryland area. The correlation coefficients derived from sample sets of transmission loss data indicate that when reception is from opposite directions, no significant correlation is evident, and when the paths of propagation are the same even though the frequencies are separated considerably, the correlation appears to be significantly high.
{"title":"Correlation in VHF propagation over irregular terrain","authors":"R. Kirby, F. Capps","doi":"10.1109/IRETAP.1956.6366304","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366304","url":null,"abstract":"A study has been made of the correlation in transmission loss observed over irregular-terrain paths. Simultaneous mobile measurements were made of two pairs of VHF broadcasting stations in the Washington, D. C-Baltimore, Maryland area. The correlation coefficients derived from sample sets of transmission loss data indicate that when reception is from opposite directions, no significant correlation is evident, and when the paths of propagation are the same even though the frequencies are separated considerably, the correlation appears to be significantly high.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126594706","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 : 1900-01-01DOI: 10.1109/IRETAP.1956.6366295
T. Morita, S. Cohn
The reflections from the surface of a dielectric lens may be cancelled by a quarter-wavelength layer of refractive index intermediate between that of air and the lens medium. The possibility of simulating a quarter-wave matching section by perturbing the boundary of the lens is described in this paper. Some of the configurations considered are corrugated surfaces, arrays of dielectric cylinders, and arrays of holes in the dielectric surface. In each case, a match may be obtained at a given frequency and angle of incidence by the proper adjustment of the depth of the perturbation, and of one other parameter such as the width of a groove.
{"title":"Microwave lens matching by simulated quarter-wave transformers","authors":"T. Morita, S. Cohn","doi":"10.1109/IRETAP.1956.6366295","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366295","url":null,"abstract":"The reflections from the surface of a dielectric lens may be cancelled by a quarter-wavelength layer of refractive index intermediate between that of air and the lens medium. The possibility of simulating a quarter-wave matching section by perturbing the boundary of the lens is described in this paper. Some of the configurations considered are corrugated surfaces, arrays of dielectric cylinders, and arrays of holes in the dielectric surface. In each case, a match may be obtained at a given frequency and angle of incidence by the proper adjustment of the depth of the perturbation, and of one other parameter such as the width of a groove.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132703288","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 : 1900-01-01DOI: 10.1109/IRETAP.1956.6366296
R. Honey, E. Jones
This paper describes the design, construction, and testing of a Foster scanner that is much simpler to build than the conventional Foster scanner. The simplifications result from the use of a choke groove and a solid barrier to replace the conventional inter-leaving finger barriers. The choke groove and solid barrier are very simple to construct, give excellent electrical performance, and permit very high scan rates. A scanner has been built and tested at 35 kmc, where the tolerance problems are very severe, and found to perform extremely well over at least a 10 per cent frequency bandwidth.
{"title":"A mechanically simple Foster scanner","authors":"R. Honey, E. Jones","doi":"10.1109/IRETAP.1956.6366296","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366296","url":null,"abstract":"This paper describes the design, construction, and testing of a Foster scanner that is much simpler to build than the conventional Foster scanner. The simplifications result from the use of a choke groove and a solid barrier to replace the conventional inter-leaving finger barriers. The choke groove and solid barrier are very simple to construct, give excellent electrical performance, and permit very high scan rates. A scanner has been built and tested at 35 kmc, where the tolerance problems are very severe, and found to perform extremely well over at least a 10 per cent frequency bandwidth.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125194012","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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