Patent ID: 11870424
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A filter device, comprising:
at least a first shunt resonator and at least a first series resonator connected in a ladder filter circuit,
the first shunt resonator comprising:
a first piezoelectric diaphragm,
a first interdigital transducer (IDT), interleaved fingers of the first IDT on a front surface of the first piezoelectric diaphragm, and
a first dielectric layer on the front surface of the first piezoelectric diaphragm between the interleaved fingers of the first IDT,

the first series resonator comprising:
a second piezoelectric diaphragm,
a second interdigital transducer (IDT), interleaved fingers of the second IDT on a front surface of the second piezoelectric diaphragm, and
a second dielectric layer on the front surface of the second piezoelectric diaphragm between the interleaved fingers of the second IDT,

wherein a thickness of the first dielectric layer is greater than a thickness of the second dielectric layer.