Patent ID: 11881835
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method of forming a filter device with low thermal impedance comprising:
forming a bonding oxide (BOX) layer on a surface of a substrate, the BOX layer spanning a cavity;
thinning the BOX layer over a least a portion of the surface of the substrate to form a thinned BOX layer that provides lower thermal resistance between an interdigital transducer (IDT) and the substrate;
bonding a piezoelectric plate to the thinned BOX layer, such that a portion of the piezoelectric plate forms a diaphragm that spans the cavity; and
forming the IDT on a surface of the piezoelectric plate, such that the IDT has interleaved fingers disposed on the diaphragm over the cavity.