{"title":"Super high electromechanical coupling and zero-temperature characteristics of KNbO/sub 3/ and its applications for low-loss wide band filters","authors":"H. Odagawa, Takeshi Matsumura, K. Yamanouchi","doi":"10.1109/ULTSYM.1997.663017","DOIUrl":null,"url":null,"abstract":"This paper describes a super high electromechanical coupling SAW propagating on potassium niobate (KNbO/sub 3/) substrate and its applications for low-loss, wide band and temperature stable SAW filters. KNbO/sub 3/ has large piezoelectric constants. We obtained the electromechanical coupling coefficient (K/sup 2/) of 0.53 for SAW in Y-cut X-propagating substrate theoretically and experimentally. It is about 10 times as large as that in LiNbO/sub 3/. Moreover, we obtained the zero temperature characteristics around room temperature in rotated Y cut substrate. Experimental results of wide band SAW filters show low loss and temperature stable characteristics. The bandwidth is about 20% and insertion losses are less than 2/spl sim/6 dB. Simulation result of ladder type filter using Y-cut KNbO/sub 3/, shows the bandwidth of 40%.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"321 1","pages":"235-238 vol.1"},"PeriodicalIF":0.0000,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1997.663017","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
This paper describes a super high electromechanical coupling SAW propagating on potassium niobate (KNbO/sub 3/) substrate and its applications for low-loss, wide band and temperature stable SAW filters. KNbO/sub 3/ has large piezoelectric constants. We obtained the electromechanical coupling coefficient (K/sup 2/) of 0.53 for SAW in Y-cut X-propagating substrate theoretically and experimentally. It is about 10 times as large as that in LiNbO/sub 3/. Moreover, we obtained the zero temperature characteristics around room temperature in rotated Y cut substrate. Experimental results of wide band SAW filters show low loss and temperature stable characteristics. The bandwidth is about 20% and insertion losses are less than 2/spl sim/6 dB. Simulation result of ladder type filter using Y-cut KNbO/sub 3/, shows the bandwidth of 40%.
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