{"title":"Waveguide $3\\times 2$ -Slot Subarray Antenna for Millimeter-Wave Car Radar","authors":"Ryosuke Sakurai;Jiro Hirokawa;Takashi Tomura","doi":"10.23919/comex.2024XBL0211","DOIUrl":null,"url":null,"abstract":"We design a <tex>$3\\times 2$</tex> -slot sub array antenna for millimeter-wave car radars in the 76 GHz band. A cavity is introduced and designed to reduce phase differences among the slots. We change the slot length, width, and spacing to improve the gain. The antenna is designed for a wide bandwidth to have double resonance by two reflection-suppressing walls in the feeding part. The measured antenna has a reflection below -10 dB across 76.4 GHz-82.0 GHz. The gain is 15.5 dBi and the sidelobe level is -15.5 dB at 78.5 GHz in the measurement.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"155-158"},"PeriodicalIF":0.3000,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904084","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEICE Communications Express","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10904084/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
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Abstract
We design a $3\times 2$ -slot sub array antenna for millimeter-wave car radars in the 76 GHz band. A cavity is introduced and designed to reduce phase differences among the slots. We change the slot length, width, and spacing to improve the gain. The antenna is designed for a wide bandwidth to have double resonance by two reflection-suppressing walls in the feeding part. The measured antenna has a reflection below -10 dB across 76.4 GHz-82.0 GHz. The gain is 15.5 dBi and the sidelobe level is -15.5 dB at 78.5 GHz in the measurement.
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