Patent ID: 11929732
Assignee: RF360 SINGAPORE PTE. LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A Radio frequency (RF) filter, comprising:
a first and a second port;
a series path coupled between the first and second ports, the series path comprising a serial connection of electro-acoustic resonators; and one or more shunt paths coupled to at least one of the resonators of the series path, the one or more shunt paths each including at least one electro-acoustic resonator comprising:
a carrier substrate;
an acoustic mirror disposed on the carrier substrate;
a bottom electrode disposed on the acoustic mirror;
a piezoelectric layer, disposed on the bottom electrode;
a top electrode disposed on the piezoelectric layer; and
a structured silicon dioxide layer disposed on portions of the piezoelectric layer surrounding a region in which the top electrode is disposed, the portions of the piezoelectric layer and the structured silicon dioxide layer having a common contact surface.