Patent ID: 6670739
Filing Date: 2003-12-30
Classification: H03H

Abstract:
A SAW apparatus comprising:a piezoelectric substrate having pyroelectric properties and having first and second main surfaces opposing each other, first and second sides opposing each other, and first and second ends opposing each other; at least one IDT disposed on the first main surface of said piezoelectric substrate and arranged to propagate surface acoustic waves in a direction that is substantially perpendicular to the first and second sides, the surface acoustic waves being reflected by the first and second sides; a SAW device disposed on the first main surface of said piezoelectric substrate, said SAW device including a first pyroelectric charge cancellation electrode located near an edge defined by the first end and the first main surface, and a second pyroelectric charge cancellation electrode located near an edge defined by the second end and the first main surface; and a package housing said SAW device and which includes a plurality of electrodes which are electrically connected to said SAW device; wherein the first and second pyroelectric charge cancellation electrodes are electrically connected via the electrodes on said package.