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:
Feb. 19, 2008
Filed:
Oct. 19, 2004
John D Larson, Iii, Palo Alto, CA (US);
Stephen Ellis, Pleasanton, CA (US);
Paul A. Bradley, Mountain View, CA (US);
Yury Oshmyansky, Laguna Beach, CA (US);
John D Larson, III, Palo Alto, CA (US);
Stephen Ellis, Pleasanton, CA (US);
Paul A. Bradley, Mountain View, CA (US);
Yury Oshmyansky, Laguna Beach, CA (US);
Avago Technologies Wireless IP (Singapore) Pte Ltd., Singapore, SG;
Abstract
The film bulk acoustic resonator (FBAR) device comprises a substrate, an acoustic Bragg reflector over the substrate, a piezoelectric element over the acoustic Bragg reflector, and a remote-side electrode over the piezoelectric element. The acoustic Bragg reflector comprises a metal Bragg layer juxtaposed with a plastic Bragg layer. The large ratio between the acoustic impedances of the plastic material of the plastic Bragg layer and the metal of the metal Bragg layer provides sufficient acoustic isolation between the FBAR and the substrate for the frequency response of the FBAR device to exhibit minor, if any, spurious artifacts arising from undesirable acoustic coupling between the FBAR and the substrate.