Patent ID: 6696736
Filing Date: 2004-02-24
Classification: H03H

Abstract:
A piezoelectric substrate for a surface acoustic wave device, the piezoelectric substrate being intended for use for a surface acoustic wave device having an interdigitated electrode formed on the piezoelectric substrate,the piezoelectric substrate being composed of a single crystal belonging to the point group 32, having a crystal structure of Ca3Ga2Ge4O14 type, containing Ca, Nb, Ga, Si and O as main components, and being represented by the chemical formula Ca3NbGa3Si2O14, wherein, when a cut angle at which the piezoelectric substrate is cut out of the single crystal and a propagation direction of a surface acoustic wave are represented in terms of Eulerian angles (&phgr;, &thgr;, &psgr;), &phgr;, &thgr;, and &psgr; are in an area in which: &phgr;=âˆ’5Â° to 5Â°, &thgr;=60Â° to 75Â°, and &psgr;=0Â° to 10Â°.