{"title":"A SAW contiguous filter bank with an m derived ladder","authors":"K. Misu, T. Nagatsuka, S. Wadaka","doi":"10.1109/ULTSYM.1988.49354","DOIUrl":null,"url":null,"abstract":"An m-derived ladder for combining SAW (surface acoustic wave) filters in a contiguous filter bank is proposed. The series element in each m-derived ladder section is composed of a parallel resonant circuit. The input transducer of a SAW filter is used as the shunt element in each section. A pole of attenuation is produced at the resonant frequency of the series element. Thus, the third-harmonic spurious response of the SAW filter is greatly suppressed by setting the pole of attenuation in the vicinity of the third harmonic. A ten-channel version of the filter bank was constructed, operating in the frequency range from 110 to 200 MHz. The insertion loss was 10+or-1.7 dB, which was as low as that of a constant k ladder filter bank, and the attenuation was greater than 42 dB in the third harmonics from 330 to 600 MHz.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"54 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE 1988 Ultrasonics Symposium Proceedings.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1988.49354","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
An m-derived ladder for combining SAW (surface acoustic wave) filters in a contiguous filter bank is proposed. The series element in each m-derived ladder section is composed of a parallel resonant circuit. The input transducer of a SAW filter is used as the shunt element in each section. A pole of attenuation is produced at the resonant frequency of the series element. Thus, the third-harmonic spurious response of the SAW filter is greatly suppressed by setting the pole of attenuation in the vicinity of the third harmonic. A ten-channel version of the filter bank was constructed, operating in the frequency range from 110 to 200 MHz. The insertion loss was 10+or-1.7 dB, which was as low as that of a constant k ladder filter bank, and the attenuation was greater than 42 dB in the third harmonics from 330 to 600 MHz.<>
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