Patent ID: 11870419
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A bulk acoustic wave resonator comprising:
a substrate;
a first electrode disposed on and spaced apart from the substrate by a cavity;
a piezoelectric layer disposed on the first electrode;
a second electrode disposed on the piezoelectric layer;
an upper layer of the bulk acoustic wave resonator disposed on the second electrode; and
a lower frame spaced apart from the substrate and having a portion of the cavity disposed therebetween,
wherein the upper layer includes a protruding portion having a first thickness and an extended portion having a second thickness less than the first thickness, and
wherein an inner end of the lower frame and an end of the protruding portion are spaced apart in a horizontal direction.