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. 13, 2010
Filed:
Jun. 19, 2007
Masafumi Iwaki, Kawasaki, JP;
Tokihiro Nishihara, Kawasaki, JP;
Masanori Ueda, Kawasaki, JP;
Go Endo, Yokohama, JP;
Masafumi Iwaki, Kawasaki, JP;
Tokihiro Nishihara, Kawasaki, JP;
Masanori Ueda, Kawasaki, JP;
Go Endo, Yokohama, JP;
Fujitsu Media Devices Limited, Yokohama, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, a second filter that has a passband at a high-frequency side of the first filter and is connected to the antenna terminal, and a resonance circuit that is connected between the second filter and the antenna terminal and includes a first inductor and a first capacitor connected in parallel. Assuming that a passband frequency of the first filter ranges from fto f(f˜f) and a passband frequency ranges from fto f(f˜f), the resonator has a resonance frequency fsatisfying:=()±(),or=2()±().