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

Claim 10:
11. 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 the first sub-filter comprises:
bonding to a first substrate a first back surface of a first piezoelectric plate having first front and back surfaces, first portions of the first piezoelectric plate forming a first plurality of diaphragms spanning respective first cavities in the first substrate; and
forming a first conductor pattern on the first front surface, the first conductor pattern including a first plurality of interdigital transducers (IDTs) of a first respective plurality of resonators, first interleaved fingers of each IDT disposed on a first respective diaphragm of the first plurality of diaphragms,

wherein connecting the second sub-filters comprises:
bonding to a second substrate a second back surface of a second piezoelectric plate having second front and back surfaces, second portions of the second piezoelectric plate forming a second plurality of diaphragms spanning respective second cavities in the second substrate; and
forming a second conductor pattern on the second front surface, the second conductor pattern including a second plurality of interdigital transducers (IDTs) of a second respective plurality of resonators, second interleaved fingers of each IDT disposed on a second respective diaphragm of the second plurality of diaphragms,

wherein a thickness of the first piezoelectric plate first portions are thicker than a thickness of the second piezoelectric plate second portions, and
wherein the first substrates is different than the second substrate.