Patent ID: 11949399
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. An acoustic resonator device comprising:
a substrate having a surface;
a piezoelectric layer;
an interdigital transducer (IDT) at a surface of the piezoelectric layer, the IDT and the piezoelectric layer configured such that a radio frequency signal applied to the IDT excites a primary shear acoustic mode within the piezoelectric layer; and
an acoustic Bragg reflector sandwiched between the surface of the substrate and the piezoelectric layer, the acoustic Bragg reflector configured to reflect the primary shear acoustic mode,
wherein the acoustic Bragg reflector is comprised of greater than or equal to 2 pairs and less than or equal to 3 pairs of alternating layers of material with high acoustic impedance and material with low acoustic impedance.