Patent ID: 6534897
Filing Date: 2003-03-18
Classification: H03H

Abstract:
A surface acoustic wave device having natural single-phase unidirectional transducer characteristics, comprising:a substrate having an anisotropy and composed of a single crystal belonging to the point group 32, the single crystal having the Ca3Ga2Ge4O14 type crystalline structure, including La, Ta, Ga and O as main components, and being represented by a chemical formula La3Ta0.5Ga5.5O14, and an electrode formed on said substrate and having a structure that exhibits natural single-phase unidirectional transducer characteristics in cooperation with the anisotropy of said substrate, wherein, when a cut angle of said substrate out of the single crystal and a propagation direction of a surface acoustic wave are represented by Eulerian angles (&phgr;, &thgr;, &psgr;) &phgr;, &thgr; and &psgr; are in a region where &phgr; is from 10Â° to 20Â°, &thgr; is from 140Â° to 157Â°, and &psgr; is from 30Â° to 60Â°.