Patent ID: 11888460
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. An acoustic resonator device comprising:
a substrate;
a single-crystal piezoelectric plate coupled to the surface of the substrate and having a portion that spans a cavity;
a buried oxide layer between the substrate and the piezoelectric plate, wherein the substrate is attached to the piezoelectric plate via the buried oxide layer, and wherein the buried oxide layer does not extend across the cavity;
a conductor pattern at a surface of the piezoelectric plate, the conductor pattern comprising an interdigital transducer (IDT) having interleaved fingers at the portion of the piezoelectric plate that spans the cavity, wherein the substrate and the piezoelectric plate include a same material; and
an etch stop at an edge of the cavity.