{"title":"具有多个传输零点和平坦群延迟的宽带吸收带通滤波器","authors":"Lei Li;Zhongxiang Shen;Wen Wu","doi":"10.1109/LMWT.2024.3391208","DOIUrl":null,"url":null,"abstract":"This letter proposes a compact and wideband absorptive bandpass filter (ABPF) with flat-in-band group delay and multiple out-of-band transmission zeros (TZs). The presented absorptive filter consists of a quarter-wavelength three-line coupled structure (TLCS) and four stubs that are basically a series connection of a lumped resistor and a short-circuited quarter-wavelength transmission line. The TZs are expressed by the adjacent and cross-coupling coefficients. It is revealed that the four stubs affect the filter’s bandwidth and TZ frequencies. To verify the design concept, a wideband absorptive filter operating at 2.4 GHz is fabricated and measured, whose simulated and measured results are in good agreement.","PeriodicalId":73297,"journal":{"name":"IEEE microwave and wireless technology letters","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Wideband Absorptive Bandpass Filter With Multiple Transmission Zeros and Flat Group Delay\",\"authors\":\"Lei Li;Zhongxiang Shen;Wen Wu\",\"doi\":\"10.1109/LMWT.2024.3391208\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This letter proposes a compact and wideband absorptive bandpass filter (ABPF) with flat-in-band group delay and multiple out-of-band transmission zeros (TZs). The presented absorptive filter consists of a quarter-wavelength three-line coupled structure (TLCS) and four stubs that are basically a series connection of a lumped resistor and a short-circuited quarter-wavelength transmission line. The TZs are expressed by the adjacent and cross-coupling coefficients. It is revealed that the four stubs affect the filter’s bandwidth and TZ frequencies. To verify the design concept, a wideband absorptive filter operating at 2.4 GHz is fabricated and measured, whose simulated and measured results are in good agreement.\",\"PeriodicalId\":73297,\"journal\":{\"name\":\"IEEE microwave and wireless technology letters\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-04-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE microwave and wireless technology letters\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10510429/\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"0\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE microwave and wireless technology letters","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10510429/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
Wideband Absorptive Bandpass Filter With Multiple Transmission Zeros and Flat Group Delay
This letter proposes a compact and wideband absorptive bandpass filter (ABPF) with flat-in-band group delay and multiple out-of-band transmission zeros (TZs). The presented absorptive filter consists of a quarter-wavelength three-line coupled structure (TLCS) and four stubs that are basically a series connection of a lumped resistor and a short-circuited quarter-wavelength transmission line. The TZs are expressed by the adjacent and cross-coupling coefficients. It is revealed that the four stubs affect the filter’s bandwidth and TZ frequencies. To verify the design concept, a wideband absorptive filter operating at 2.4 GHz is fabricated and measured, whose simulated and measured results are in good agreement.