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:
Aug. 16, 2016
Filed:
Feb. 17, 2011
Tetsuya Tsurunari, Osaka-Fu, JP;
Joji Fujiwara, Osaka-Fu, JP;
Hiroyuki Nakamura, Osaka-Fu, JP;
SKYWORKS PANASONIC FILTER SOLUTIONS JAPAN CO., LTD., Kadoma-Shi, JP;
Abstract
An antenna duplexer has a first filter passing a signal in a first frequency band and a second filter passing a signal in a second frequency band which is higher than the first frequency band. The first filter includes a first series resonator having a lowest antiresonance frequency and second series resonators. A propagation angle of a main elastic wave of the first series resonator a propagation angle of a main elastic wave of each of the second series resonators are different from each other so that an electromechanical coupling coefficient of the first series resonator is smaller than an electromechanical coupling coefficient of the second series resonators.