{"title":"A SAW filter bank using hyperbolically tapered transducers","authors":"L. Solie, H.P. Fredricksen, S. Lins, C. Nelson","doi":"10.1109/ULTSYM.1988.49346","DOIUrl":null,"url":null,"abstract":"It is shown that the hyperbolically tapered transducer is capable of launching a relatively narrow SAW (surface acoustic wave) beam from some point across a wide transducer aperture. The center of this narrow SAW beam varies linearly with frequency across the transducer. Thus, the transducer performs the spatial frequency sorting as it launches a wave. This makes it an ideal candidate for a filter bank or frequency-division multiplexer. A 14-channel multiplexer has been developed with a total bandwidth of 120 MHz centered at 180 MHz, (1 octave) out-of-band rejection of 40 dB and an insertion loss of 19 dB. Cascading filters demonstrates an out-of-band rejection of over 80 dB with an insertion loss around 30 dB.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"18","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE 1988 Ultrasonics Symposium Proceedings.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1988.49346","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 18
Abstract
It is shown that the hyperbolically tapered transducer is capable of launching a relatively narrow SAW (surface acoustic wave) beam from some point across a wide transducer aperture. The center of this narrow SAW beam varies linearly with frequency across the transducer. Thus, the transducer performs the spatial frequency sorting as it launches a wave. This makes it an ideal candidate for a filter bank or frequency-division multiplexer. A 14-channel multiplexer has been developed with a total bandwidth of 120 MHz centered at 180 MHz, (1 octave) out-of-band rejection of 40 dB and an insertion loss of 19 dB. Cascading filters demonstrates an out-of-band rejection of over 80 dB with an insertion loss around 30 dB.<>
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