{"title":"Measurements of Doubly-Rotated-Cuts of Langasite Isomorph","authors":"Yoonkee Kim","doi":"10.1109/FREQ.2006.275448","DOIUrl":null,"url":null,"abstract":"In this paper, we report the measured properties of doubly-rotated cuts of bulk-acoustic-wave resonators made of a langasite isomorph material. Test resonators with planoconvex blanks (14 mm diameter, 2 diopter, nominal 10 MHz 5th OT) were fabricated for four different cuts: (thetas = 10deg, phi = 10deg), (thetas = 10deg, phi = 20deg), (thetas = 20deg, phi = 10deg), (thetas = 20deg, phi = 20deg). Using an impedance analyzer, we were able to measure strongly excited fundamental and 3rd overtones of the c- and b-modes, along with their anharmonic modes, as evidenced by their low motional resistances. The a-modes were weakly excited but could also be measured. The theoretical values of eigenmode velocities and piezoelectric coupling coefficients of the doubly-rotated cuts were obtained by solving Christoffel equations. The theoretical values were compared to the measured ones. The frequency-temperature (f-t) characteristics were also measured in the temperature range of -55 degC to 85 degC. The f-t curves of the c- and b-modes showed parabolic characteristics","PeriodicalId":445945,"journal":{"name":"2006 IEEE International Frequency Control Symposium and Exposition","volume":"300 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2006-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2006 IEEE International Frequency Control Symposium and Exposition","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/FREQ.2006.275448","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
In this paper, we report the measured properties of doubly-rotated cuts of bulk-acoustic-wave resonators made of a langasite isomorph material. Test resonators with planoconvex blanks (14 mm diameter, 2 diopter, nominal 10 MHz 5th OT) were fabricated for four different cuts: (thetas = 10deg, phi = 10deg), (thetas = 10deg, phi = 20deg), (thetas = 20deg, phi = 10deg), (thetas = 20deg, phi = 20deg). Using an impedance analyzer, we were able to measure strongly excited fundamental and 3rd overtones of the c- and b-modes, along with their anharmonic modes, as evidenced by their low motional resistances. The a-modes were weakly excited but could also be measured. The theoretical values of eigenmode velocities and piezoelectric coupling coefficients of the doubly-rotated cuts were obtained by solving Christoffel equations. The theoretical values were compared to the measured ones. The frequency-temperature (f-t) characteristics were also measured in the temperature range of -55 degC to 85 degC. The f-t curves of the c- and b-modes showed parabolic characteristics
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