Patent ID: 11929735
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A filter device comprising:
a substrate having a surface;
at least one single-crystal piezoelectric layer attached either directly or via one or more intermediate layers to the surface of the substrate, the at least one single-crystal piezoelectric layer having portions that form one or more diaphragms over respective cavities, each diaphragm having a respective edge at a portion of a perimeter of a respective cavity; and
a conductor pattern at a surface of the at least one single-crystal piezoelectric layer, the conductor pattern including a plurality of interdigital transducers (IDTs) of a respective plurality of acoustic resonators, wherein each IDT has a pair of busbars that extend in a direction parallel to each other and a plurality of interleaved fingers that extend from each of the pair of busbars in a first direction and on a diaphragm of the one or more diaphragms,
wherein the at least one single-crystal piezoelectric layer and all of the IDTs are configured such that respective radio frequency signals applied to each IDT excite respective primary shear acoustic modes in the respective diaphragms,
wherein at least a portion of the edge of at least one diaphragm extends at an angle that is oblique to the first direction in which the respective interleaved fingers extend on the respective diaphragm.