The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2012
Filed:
Dec. 22, 2010
Emmanuel Defay, Voreppe, FR;
Sebastien Boisseau, Grenoble, FR;
Ghislain Despesse, Saint Egreve, FR;
Brice Ivira, La Guerche sur l'Aubois, FR;
Alexandre Reinhardt, Saint Martin d'Heres, FR;
Emmanuel Defay, Voreppe, FR;
Sebastien Boisseau, Grenoble, FR;
Ghislain Despesse, Saint Egreve, FR;
Brice Ivira, La Guerche sur l'Aubois, FR;
Alexandre Reinhardt, Saint Martin d'Heres, FR;
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 (); electrodes () on either side of this layer; and at least one electret layer () 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.