Patent ID: 9425764
Filing Date: 2016-08-23
CPC Classification: H03H

Claim Text:
1. A bulk acoustic wave (BAW) resonator device, comprising: a bottom composite electrode on a substrate over one of a cavity and an acoustic reflector, the bottom composite electrode including a bottom inner portion and a bottom integrated frame, the bottom integrated frame being arranged between planar top and bottom surfaces of the bottom composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the bottom integrated frame and the bottom inner portion have substantially the same thickness; a piezoelectric layer on the bottom electrode; and a top composite electrode on the piezoelectric layer, the top composite electrode including a top inner portion and a top integrated frame, the top integrated frame being arranged between planar top and bottom surfaces of the top composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the top integrated frame and the top inner portion have substantially the same thickness; wherein the bottom and top integrated frames are positioned adjacent the piezoelectric layer at outer regions of the bottom and top composite electrodes, respectively, and substantially surround the bottom and top inner portions located at center regions of the bottom and top composite electrodes, respectively, and wherein an inner edge of the bottom integrated frame, adjacent the bottom inner portion, is not vertically aligned with an inner edge of the top integrated frame, adjacent the top inner portion.