Patent ID: 11916532
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method of fabricating a filter device comprising:
attaching at least one piezoelectric layer to a substrate directly or via one or more intermediate layers, the at least one piezoelectric layer having portions that form one or more diaphragms spanning respective cavities of the filter device;
forming an insulating layer on the at least one piezoelectric layer; and
forming a conductor pattern comprising a plurality of interdigital transducers (IDTs) of a respective plurality of acoustic resonators on the at least one piezoelectric layer, interleaved fingers of each of the plurality of IDTs on the one or more diaphragms of the at least one piezoelectric layer, wherein the insulating layer is disposed between the at least one piezoelectric layer and portions of the conductor pattern other than the interleaved fingers of each of the plurality of IDTs,
wherein the insulating layer is only disposed between the at least one piezoelectric layer and portions of the conductor pattern other than the interleaved fingers.