Patent ID: 11870423
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method of fabricating an acoustic resonator device on a single-crystal lithium niobate (LN) plate having front and back surfaces, the back surface attached to a substrate, the method comprising:
forming a cavity in the substrate such that a portion of the LN plate forms a diaphragm spanning the cavity;
forming an interdigital transducer (IDT) on the front surface of the LN plate such that interleaved IDT fingers of the IDT are disposed on the diaphragm, the LN plate and the IDT configured such that a radio frequency signal applied to the IDT excites a shear primary acoustic mode within the diaphragm; and
forming a half-lambda dielectric layer on one of the front surface and the back surface of the diaphragm, wherein
Euler angles of the LN plate are [0°, β, 0°], where 20°≤β≤25°.