Patent ID: 11901874
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method of fabricating an acoustic resonator device on a single-crystal piezoelectric layer having parallel front and back surfaces, the back surface attached to a substrate either directly or via at least one intermedia layer, the method comprising:
forming a cavity in the substrate such that a portion of the single-crystal piezoelectric layer forms a diaphragm over the cavity;
forming an interdigital transducer (IDT) at the single-crystal piezoelectric layer such that interleaved fingers of the IDT are at the diaphragm; and
forming a dielectric layer on one of the front surface and the back surface of the single-crystal piezoelectric layer, with the dielectric layer having a thickness of a half lambda.