Patent ID: 7701114
Filing Date: 2010-04-20
Classification: H03H

Abstract:
1. A surface acoustic wave device comprising: an LiNbO an electrode provided on the LiNbO a first silicon oxide film provided in an area other than an area in which the electrode is arranged so as to have a thickness substantially equal to that of the electrode; and a second silicon oxide film arranged to cover the electrode and the first silicon oxide film; wherein the surface acoustic wave device utilizes an SH wave, wherein a duty D of the IDT electrode is at least about 0.52, and θ of the Euler angles (0°±5, θ±5°, 0°±10°) is set so as to fall within a range that satisfies the following Inequality (1A) or (1B): where D is a duty, and C is a thickness of the IDT electrode normalized by a wavelength λ.