Patent ID: 6356167
Filing Date: 2002-03-12
Classification: H03H

Abstract:
A surface acoustic wave resonator comprising:a piezoelectric substrate made of a langasite single crystal; and an interdigital transducer located on the surface of the piezoelectric substrate; wherein the Euler angle (&phgr;, &thgr;, &phgr;) of the piezoelectric substrate is approximately (0Â°, 140Â° to 150Â°, 24Â°Â±1Â°), and the film thickness H of the interdigital transducer is within a range of about 0.005 to about 0.15 relative to the wavelength &lgr; of a surface acoustic wave generated on the piezoelectric substrate; and the film thickness of the interdigital transducer is configured such that fluctuation of an operation frequency of the surface acoustic wave resonator is substantially zero between about 20Â° C. to about 30Â° C.