Patent · US Active

Acoustic resonator comprising an electret and method of producing said resonator, application to switchable coupled resonator filters

US8310129B2 · kind B2 · utility

4Cited by

10References

15Claims

0Family size

Assignee

COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

Emmanuel Defay · Saint-Égrève, FR
Sebastien Boisseau · Grenoble, FR
Ghislain Despesse · Le Péage, FR
Brice Ivira · San Jose, US
Alexandre Reinhardt · Saint-Martin-d'Hères, FR

Key dates

Filing date	Dec 22, 2010
Grant date	Nov 13, 2012
Priority date	—
Expiry date	Jan 12, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/42
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

Acoustic resonator comprising an electret, and method of producing said resonator, application to switchable coupled resonator filters.The resonator comprises: at least one piezoelectric layer (30); electrodes (24, 26) on either side of this layer; and at least one electret layer (32) between the electrodes, to apply a permanent electric field to the piezoelectric layer. The intensity of this electric field is determined to shift the resonance frequency of the resonator by a desired value. The piezoelectric layer may contain electrical charges to itself constitute the electret layer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.