Patent ID: 6335584
Filing Date: 2002-01-01
Classification: H03H

Abstract:
An edge reflection type surface acoustic wave device comprising:a surface acoustic wave substrate having a pair of opposed edges; and at least one interdigital transducer disposed on the surface acoustic wave substrate and arranged to generate a Shear Horizontal type surface acoustic wave such that the Shear Horizontal type surface acoustic wave is reflected between the pair of opposed edges; wherein the interdigital transducer includes electrode fingers and is divided into a plurality of sub-IDT portions along the surface acoustic wave-propagating direction, the electrode fingers closest to each other between adjacent sub-IDT portions being at the same potential so as not to be excited between the adjacent sub-IDT portions; and wherein, the pair of opposed edges are defined by cut surfaces and when the widths of the outermost electrode fingers in the surface acoustic wave-propagating direction of the interdigital transducer are equal to the widths of the remaining electrode fingers, the pair of opposed edges are defined by the cut surfaces which are located inside of the center of the outermost electrode fingers in the surface acoustic wave-propagating direction.