Patent ID: 11942922
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A filter device, comprising:
a plurality of acoustic resonators comprising:
a substrate;
a lithium niobate plate having front and back surfaces, the back surface facing the substrate, a portion of the lithium niobate plate forming a diaphragm over a cavity of the respective acoustic resonator; and
a conductor pattern at the lithium niobate plate, the conductor pattern comprising an interdigital transducer (IDT) having interleaved fingers on the respective diaphragm,

wherein the lithium niobate plate and the IDT of each of the plurality of acoustic resonators is configured such that respective radio frequency signals applied to each IDT excites a primary shear acoustic mode in the respective diaphragm;
wherein Euler angles of the lithium niobate plate of each of the plurality of acoustic resonators are 0°, β, 0°, where β is greater than or equal to 40° and less than or equal to 70°;
wherein a first pitch/mark zone of the interleaved fingers of at least one of the plurality of acoustic resonators has a pitch between a pair of adjacent interleaved fingers equal to a first pitch value P1 and a mark of at least one of the interleaved fingers equal to a first mark value M1; and
wherein a second pitch/mark zone of the interleaved fingers of the at least one acoustic resonator has a pitch between a pair of adjacent interleaved fingers equal to a second pitch value P2 not equal to P1 and a mark of at least one of the interleaved fingers equal to a second mark value M2 not equal to M1.