Patent ID: 11967939
Assignee: SKYWORKS GLOBAL PTE. LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A multiplexer comprising:
a first filter having a first passband, the first filter including a bulk acoustic wave resonator that includes first and second electrodes, a piezoelectric layer positioned between the first electrode and the second electrode, and a multi-layer raised frame structure including a first raised frame layer and a second raised frame layer, the first raised frame layer being positioned between a first electrode and the piezoelectric layer, the first raised frame layer having a lower acoustic impedance than the first electrode, and the second raised frame layer overlapping with the first raised frame layer; and
a second filter having a second passband, the second filter coupled to the first filter at a common node, and the first raised frame layer configured to move a raised frame mode of the bulk acoustic wave resonator away from the second passband.