Patent ID: 6373167
Filing Date: 2002-04-16
Classification: H03H

Abstract:
A transversal type surface acoustic wave filter comprising:an input interdigital transducer (IDT), which is comprised of a pair of comb electrodes whose respective electrode fingers are interdigitally formed; substrate boundary surfaces which formed at an angle to a wave front of a propagating surface acoustic wave generated in said input IDT; an output IDT, which is comprised of a pair of comb electrodes whose respective electrode fingers are interdigitally formed; wherein said input and output IDTs and said substrate boundary surfaces are all formed on a piezoelectric substrate; and wherein said input and output IDTs are arranged in parallel and in close proximity to each other along the longitudinal direction of the electrode fingers of said IDTs, and are arranged such that the input and output sides of each IDT are oriented in a direction perpendicular to the longitudinal direction of said electrode fingers.