Patent ID: 11936358
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An acoustic resonator device with low thermal impedance comprising:
a substrate having a surface;
a single-crystal piezoelectric plate having front and back surfaces, the back surface attached to the surface of the substrate via a bonding oxide (BOX) layer except for a portion of the piezoelectric plate including a diaphragm that spans a cavity; and
a conductor pattern including an interdigital transducer (IDT) at the single-crystal piezoelectric plate such that interleaved fingers of the IDT are at the diaphragm,
wherein the single-crystal piezoelectric plate and the BOX layer are each removed at respective locations over the surface of the substrate to provide lower thermal resistance between the conductor pattern and the substrate, and
wherein the respective locations where each of the single-crystal piezoelectric plate and the BOX layer are removed at least partially overlap each other.