Patent ID: 11923826
Assignee: NINGBO SEMICONDUCTOR INTERNATIONAL CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A film bulk acoustic resonator, comprising:
a first substrate;
a support layer bonded on the first substrate, wherein the support layer contains a first opening through the support layer and on the first substrate;
a piezoelectric stacked layer covering the first opening to form a first cavity, wherein the piezoelectric stacked layer includes a first electrode, a piezoelectric layer, and a second electrode;
a dielectric layer formed over the piezoelectric stacked layer, wherein the dielectric layer contains a second opening through the dielectric layer, and the second opening is over the first cavity; and
a second substrate, bonded on the dielectric layer and covering the second opening to form a second cavity, wherein:
the piezoelectric stacked layer is between the first cavity and the second cavity;
a first trench, connected to the first cavity, passes through the first electrode and the piezoelectric layer;
a second trench, connected to the second cavity, passes through the second electrode and the piezoelectric layer;
a region encircled by the first trench and the second trench is an effective working region of the film bulk acoustic resonator; and
projections of the first trench and the second trench on a bottom surface of the first substrate include two junctions, and at each junction, adjacent ends of the first and second trenches are connected or have a spacing there-between.