Patent ID: 11863160
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming a radio frequency filter, comprising:
connecting a first sub-filter and a second sub-filter in parallel between a first port and a second port, wherein connecting each of the first and second sub-filters comprises:
bonding to a substrate a back surface of a piezoelectric plate having front and back surfaces, portions of the piezoelectric plate forming a plurality of diaphragms spanning respective cavities in the substrate; and
forming a conductor pattern on the front surface, the conductor pattern including a plurality of interdigital transducers (IDTs) of a respective plurality of resonators, interleaved fingers of each IDT disposed on a respective diaphragm of the plurality of diaphragms, wherein

a thickness of the portion of the piezoelectric plate of the first sub-filter is different from a thickness of the portion of the piezoelectric plate of the second sub-filter, and
wherein the substrate of the first sub-filter is different than the substrate of the second sub-filter.