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:
Mar. 22, 2016
Filed:
Mar. 02, 2015
Skyworks Panasonic Filter Solutions Japan Co., Ltd., Kadoma-Shi, JP;
Toru Yamaji, Kyoto-Fu, JP;
Kazunori Nishimura, Kyoto-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 includes first and second filters connected to an antenna terminal. The first filter has a passband of a low frequency band. The second filter has a passband of a high frequency band. The second filter is a ladder-type filter including series-arm resonators and parallel-arm resonators. At least one parallel-arm resonator out of the parallel-arm resonators has a main resonance and an auxiliary resonance. Attenuation poles caused by the main resonance and the auxiliary resonance are within the low frequency band. This antenna duplexer has a high attenuation characteristic and a high isolation characteristic while maintaining a low insertion loss.