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:
Jul. 18, 2006
Filed:
Feb. 26, 2003
Eiju Komuro, Tokyo, JP;
Katsuhiko Gunji, Tokyo, JP;
Eiju Komuro, Tokyo, JP;
Katsuhiko Gunji, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A duplexer () comprises a chip () including a transmission filter () for passing a transmission signal therethrough and interrupting a reception signal and a reception filter () for passing a reception signal therethrough and interrupting a transmission signal. Each of the transmission filter () and the reception filter () includes thin-film piezoelectric resonators (and) each of which has a piezoelectric thin film that exhibits a piezoelectric property and two excitation electrodes that are disposed on both surfaces of the piezoelectric thin film and apply an excitation voltage to the piezoelectric thin film. All of the thin-film piezoelectric resonators (and) that the transmission filter () and the reception filter () include are disposed on a single base.