Patent ID: 6496086
Filing Date: 2002-12-17
Classification: H03H

Abstract:
A surface acoustic wave device comprising a piezoelectric substrate, input and output interdigital transducer (IDT) electrodes provided on said piezoelectric substrate in a manner such that the direction of propagation of surface acoustic waves is parallel, a first reflector electrode provided on the output side of said surface acoustic waves at a predetermined distance from said input interdigital transducer electrode, and a second reflector electrode provided at a predetermined distance from said output interdigital transducer electrode in a manner such that said surface acoustic waves reflected by said first reflector electrode can be reflected and propagated to said output interdigital transducer electrode, wherein Equation 1 is satisfied:2(&thgr;âˆ’5)&lE;tanâˆ’1(D/L)&lE;2(&thgr;+5)â€ƒâ€ƒ(1) where&thgr;: angle of inclination of said first or said second reflector electrode relative to a plane perpendicular to the direction of propagation of surface acoustic waves of said input and output IDT electrodes in degrees (excluding zero degree); D: center-to-center distance in &mgr;m of the widths of said input and output IDT electrodes in the direction perpendicular to the direction of propagation of surface acoustic waves; L: center-to-center distance in &mgr;m of said first and second reflector electrodes.