Patent ID: 6946930
Filing Date: 2005-09-20
Classification: H03H

Abstract:
1. A surface acoustic wave device, comprising: a quartz substrate; a plurality of first fingers, disposed on the quartz substrate, constituting an interdigital transducer (IDT) for exciting shear-horizontal waves (SH waves); and a plurality of second fingers, disposed on the quartz substrate, for reflecting the SH waves; wherein the quartz substrate is an ST-Cut 90° X-propagation quartz substrate with the Euler angles (0°, θ90°±2°), wherein the angle θ lies in the range of about 110° to about 150°, and the first and second fingers are made of a material including Al as a main component, and a normalized film thickness (H/λ) of the first and second fingers is within the range of about 0.040 to about 0.135.