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

Claim 0:
1. An acoustic resonator device comprising:
a substrate having a surface;
a single-crystal piezoelectric layer having front and back surfaces, the back surface attached to the surface of the substrate either directly or via at least one intermedia layer, with a portion of the single-crystal piezoelectric layer forming a diaphragm over a cavity;
an interdigital transducer (IDT) at the single-crystal piezoelectric layer such that interleaved fingers of the IDT are at the diaphragm; and
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.