Patent ID: 6856218
Filing Date: 2005-02-15
Classification: H03H

Abstract:
1. A surface acoustic wave device having an interdigital transducer electrode that excites a Rayleigh wave on a main surface of an in-plane rotational ST-cut crystal plate having Eulerian angles of (0°, 113° to 135°, and ±(40° to 49°)), a ratio of an electrode width (Lt) and an interelectrode pitch (Pt) of said interdigital transducer electrode being 0.5 or more and 0.65 or less, when said Eulerian angles are expressed by (φ, θ, and ±ψ), that a lower limit of ψ is within the range of |ψ|=|−0.317θ+81.82°|, and an upper limit of ψ is within the range of |ψ|=|0.160θ+27.78°|.