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

Claim 7:
8. A method of fabricating a filter device on a piezoelectric layer attached either directly or via one or more intermediate layers to a substrate, the method comprising:
forming one or more cavities in at least one of the substrate and the one or more intermediate layers, such that respective portions of the piezoelectric layer form one or more diaphragms suspended over the one or more cavities, each diaphragm having a respective edge a portion of a perimeter of a respective cavity; and
forming a conductor pattern on a surface of the piezoelectric layer, the conductor pattern including a plurality of interdigital transducers (IDTs) of a respective plurality of resonators including a shunt resonator and a series resonator, 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 respective diaphragm of the one or more diaphragms,
wherein the piezoelectric layer and all of the plurality of IDTs are configured such that radio frequency signals applied to the IDTs excite respective primary shear acoustic modes in the respective diaphragms, and
wherein at least a portion of the edge of at least one diaphragm extends at an oblique angle to the first direction in which the respective interleaved fingers extend on the respective diaphragm.