Patent ID: 9735754
Date: 2017-08-15
CPC Classifications: H03H

Claim:
1. A film bulk acoustic wave resonator (BAWR) comprising: a substrate; an air cavity disposed between the substrate and a bulk acoustic resonance unit; the bulk acoustic resonance unit comprising: a first electrode, a second electrode, and a piezoelectric layer disposed between the first electrode and the second electrode; a plurality of compensation layers comprising respective materials that adjusts a resonance frequency that is modified in the bulk acoustic resonance unit according to a temperature; and a property compensation layer included above the plurality of compensation layers, wherein the first electrode is disposed above the piezoelectric layer and the second electrode is disposed below the piezoelectric layer, wherein the plurality of compensation layers comprises: a first compensation layer disposed above the first electrode; a second compensation layer disposed below the second electrode; and a third compensation layer disposed below the second electrode, and wherein the property compensation layer is included above the edges of a surface of the first compensation layer so that a remaining portion of the surface between the edges is not covered by the property compensation layer.