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

Claim 0:
1. A method of forming a filter device with low thermal impedance, the method comprising:
forming a bonding oxide (BOX) layer on a surface of a substrate;
bonding a piezoelectric plate to the BOX layer, such that a portion of the piezoelectric plate forms a diaphragm spanning a cavity;
removing the piezoelectric plate and the BOX layer from at least a portion of the surface of the substrate; and
forming a conductor pattern on a surface of the piezoelectric plate, wherein:
the conductor pattern contacts the portion of the surface of the substrate where the piezoelectric plate and BOX were removed, and
the conductor pattern includes an interdigital transducer (IDT) with interleaved fingers disposed on the diaphragm spanning the cavity.