Patent ID: 11901878
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A method of fabricating an acoustic resonator device, comprising:
bonding a piezoelectric plate to a substrate;
forming a cavity in the substrate, before or after bonding the piezoelectric plate to the substrate, such that a portion of the piezoelectric plate forms a diaphragm spanning the cavity; and
forming an interdigital transducer (IDT) on the front surface of the piezoelectric plate such that interleaved fingers of the IDT are disposed on the diaphragm, the IDT configured to excite a primary acoustic mode in the diaphragm in response to a radio frequency signal applied to the IDT,
wherein the interleaved fingers comprise a first layer adjacent the diaphragm and a second layer over the first layer, the second layer having a greater width than the first layer.