Patent ID: 11909373
Assignee: GLOBAL COMMUNICATION SEMICONDUCTORS, LLC
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A bulk acoustic resonator, comprising:
a substrate;
a stack over the substrate, the stack including a first electrode, a second electrode, and a piezoelectric layer between the first electrode and the second electrode; and
an edge frame on the first electrode and protruding into the piezoelectric layer; wherein:
a region of overlap of the first electrode, the second electrode and the piezoelectric layer forms an active region of the stack;
the piezoelectric layer has a trench extending parallel to a boundary of the active region; and
the edge frame extends parallel to the boundary of the active region,

wherein a top of the edge frame is below a top surface of the piezoelectric layer and above a bottom surface of the trench.