{"title":"Scattering by arbitrary-shaped over-moded waveguides","authors":"C. Ryan","doi":"10.1109/APS.1989.134854","DOIUrl":null,"url":null,"abstract":"The first six TE modes were used to compute the RCS (radar cross section) for a shorted trapezoidal waveguide. It was found that the individual-mode RCS patterns did not agree with measured RCS patterns, and it was necessary to use a combination of modes to obtain satisfactory results. The calculated domain single-mode azimuth-plane RCS and measured RCS were compared. This single-mode calculation underestimates the measured RCS. The measured RCS data, taken over a frequency range of 2 to 18 GHz and an angular range of +/-70 degrees , exhibit fluctuations that indicate phase interference between multiple waveguide modes. Since the precise relative phase between the higher order modes are not usually known, a statistical approach was used to compute a mean RCS and standard deviation. A comparison between the statistically calculated RCS and the fluctuating measured data between 6.75 and 6.95 GHz is shown.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Digest on Antennas and Propagation Society International Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/APS.1989.134854","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
The first six TE modes were used to compute the RCS (radar cross section) for a shorted trapezoidal waveguide. It was found that the individual-mode RCS patterns did not agree with measured RCS patterns, and it was necessary to use a combination of modes to obtain satisfactory results. The calculated domain single-mode azimuth-plane RCS and measured RCS were compared. This single-mode calculation underestimates the measured RCS. The measured RCS data, taken over a frequency range of 2 to 18 GHz and an angular range of +/-70 degrees , exhibit fluctuations that indicate phase interference between multiple waveguide modes. Since the precise relative phase between the higher order modes are not usually known, a statistical approach was used to compute a mean RCS and standard deviation. A comparison between the statistically calculated RCS and the fluctuating measured data between 6.75 and 6.95 GHz is shown.<>
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