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

Claim 16:
17. An acoustic resonator device comprising:
a substrate;
a lithium tantalate plate having front and back surfaces, the back surface facing the substrate, a portion of the lithium tantalate plate forming a diaphragm over a cavity of the acoustic resonator device; and
an interdigital transducer (IDT) at the lithium tantalate plate such that interleaved fingers of the IDT are on the diaphragm, the IDT and the lithium tantalate plate configured such that a radio frequency signal applied to the IDT excites a primary shear acoustic mode in the diaphragm;
wherein Euler angles of the lithium tantalate plate are [0°, β, 0°], where β is greater than or equal to 18° and less than or equal to 54°;
wherein a first pitch/mark zone of the interleaved fingers 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 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.