{"title":"The planar dual-polarized cavity backed sinuous antenna - a design summary","authors":"J. Cloete, T. Sickel","doi":"10.1109/APWC.2012.6324959","DOIUrl":null,"url":null,"abstract":"DuHamel's dual-polarized cavity-backed sinuous antenna was a remarkable invention, which is now widely used in RWR, DF and ELINT systems. The physical principles of especially the four-arm planar sinuous are well understood, including its interaction with the absorbing cavity that is used to achieve essentially frequency independent input impedance and unidirectional radiation patterns over multi-octave bandwidths. The absorber loaded cavity reduces the efficiency of the equivalent bi-directional free-space planar sinuous by around 50%, which is usually acceptable for EW receivers but not in low-noise applications like radio-astronomy where absorbing materials cause havoc with noise-temperature.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/APWC.2012.6324959","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
DuHamel's dual-polarized cavity-backed sinuous antenna was a remarkable invention, which is now widely used in RWR, DF and ELINT systems. The physical principles of especially the four-arm planar sinuous are well understood, including its interaction with the absorbing cavity that is used to achieve essentially frequency independent input impedance and unidirectional radiation patterns over multi-octave bandwidths. The absorber loaded cavity reduces the efficiency of the equivalent bi-directional free-space planar sinuous by around 50%, which is usually acceptable for EW receivers but not in low-noise applications like radio-astronomy where absorbing materials cause havoc with noise-temperature.