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

Claim 0:
1. A bulk acoustic wave resonator comprising:
a substrate;
a first electrode, wherein a cavity is formed between the substrate and the first electrode;
a piezoelectric layer disposed on the first electrode and overlapping at least a portion of the first electrode;
a second electrode disposed on the piezoelectric layer and overlapping at least a portion of the piezoelectric layer;
a passivation layer having at least a portion disposed on the second electrode and overlapping at least a portion of the second electrode; and
a lower frame spaced apart from the substrate and having a portion of the cavity disposed therebetween,
wherein any one of the second electrode and the passivation 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.