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

Claim 16:
17. A bulk acoustic wave resonator comprising:
a substrate;
a first electrode, wherein a cavity is disposed 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 active region in which the protruding portion, the piezoelectric layer, and the first electrode all overlap, a first region disposed between an end of the active region and an inner end of the lower frame, and a second region disposed outside of the first region and in which the extended portion and the lower frame overlap, are continuously disposed.