Jinkai Wu, A. Nashashibi, M. Kashanianfard, K. Sarabandi
{"title":"A Low-loss Waveguide Filter for Harmonic Rejection in a Polarimetric Automotive Radar","authors":"Jinkai Wu, A. Nashashibi, M. Kashanianfard, K. Sarabandi","doi":"10.23919/USNC/URSI49741.2020.9321613","DOIUrl":null,"url":null,"abstract":"A 75-83GHz waveguide band-pass filter is designed and fabricated for harmonic rejection of a multiplier chain used in a polarimetric automotive radar. The radar uses a multiplier/amplifier chain to achieve the desired signal at E-band from a source at X-band. It is shown that this filter can provide more than 50 dB signal suppression at 72 GHz (7th harmonic) and 35 dB suppression at 85.5 GHz (9th harmonic) with less than 1 dB ripples in the pass-band and less than 500 ps group delay. The filter is made of a perforated septum placed in the E-plane of a rectangular waveguide. Fabrication error was successfully minimized by using a brass sheet and a high precision laser cutter. This high-performance filter is shown to improve the performance of the FMCW MMW radar by significantly lowering the noise floor and eliminating other interference effects.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.23919/USNC/URSI49741.2020.9321613","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
A 75-83GHz waveguide band-pass filter is designed and fabricated for harmonic rejection of a multiplier chain used in a polarimetric automotive radar. The radar uses a multiplier/amplifier chain to achieve the desired signal at E-band from a source at X-band. It is shown that this filter can provide more than 50 dB signal suppression at 72 GHz (7th harmonic) and 35 dB suppression at 85.5 GHz (9th harmonic) with less than 1 dB ripples in the pass-band and less than 500 ps group delay. The filter is made of a perforated septum placed in the E-plane of a rectangular waveguide. Fabrication error was successfully minimized by using a brass sheet and a high precision laser cutter. This high-performance filter is shown to improve the performance of the FMCW MMW radar by significantly lowering the noise floor and eliminating other interference effects.
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