Patent ID: 11916539
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A band N77 bandpass filter comprising:
a first chip comprising a first substrate, a first rotated YX-cut lithium niobate plate (1st LN plate), and a first plurality of acoustic resonators, each of the first plurality of acoustic resonators comprising:
an interdigital transducer (IDT) at the 1st LN plate, interleaved fingers of the IDT at a respective diaphragm, the diaphragm comprising a respective portion of the 1st LN plate spanning a respective cavity in the first substrate and a dielectric layer on the 1st LN plate between the interleaved fingers of the IDT,
wherein an LN-equivalent thickness of the diaphragm is less than 535 nm;

a second chip comprising a second substrate, a second rotated YX-cut lithium niobate plate (2nd LN plate), and a second plurality of acoustic resonators, each of the second plurality of acoustic resonators comprising:
an interdigital transducer (IDT) at the 2nd LN plate, interleaved fingers of the IDT at a respective diaphragm, the diaphragm comprising a respective portion of the 2nd LN plate spanning a respective cavity in the first substrate and a dielectric layer at the 2nd LN plate between the interleaved fingers of the IDT,
wherein an LN-equivalent thickness of the diaphragm is greater than 556 nm; and

a circuit card coupled to the first chip and the second chip, the circuit card comprising conductors for making electrical connections between the first chip and the second chip.