Patent ID: 9325293
Filing Date: 2016-04-26
CPC Classification: H03H

Claim Text:
1. An acoustic wave bandpass filter comprising: at least two bulk acoustic wave resonators, laterally coupled to each other acoustically, each of the at least two bulk acoustic resonators including a film of piezoelectric material and at least one of a first electrode and a second electrode, wherein the at least two bulk acoustic wave resonators are configured to propagate bulk waves in a direction perpendicular to a plane of the film of piezoelectric material; and at least one first phononic crystal structure having a periodic arrangement of a plurality of materials which are acoustically different from each other, causing stop bands, wherein the stop bands are frequency ranges in which no acoustic wave propagates, wherein the at least one first phononic crystal structure is located between said at least two bulk acoustic wave resonators such that a transmission coefficient of the bulk waves can be decreased in a direction parallel to the plane of the film of piezoelectric material, wherein the at least one first phononic crystal structure is formed in a matrix of dielectric material or with patterns made from dielectric material.