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. 03, 2009
Filed:
Jun. 22, 2007
Tetsuro Harada, Otsu, JP;
Naoto Yamaguchi, Moriyama, JP;
Naoki Nakayama, Sakai, JP;
Takanori Uejima, Moriyama, JP;
Hidehiro Takano, Kyoto, JP;
Koki Saito, Ibaraki, JP;
Tetsuro Harada, Otsu, JP;
Naoto Yamaguchi, Moriyama, JP;
Naoki Nakayama, Sakai, JP;
Takanori Uejima, Moriyama, JP;
Hidehiro Takano, Kyoto, JP;
Koki Saito, Ibaraki, JP;
Murata Manufacturing Co., Ltd, Kyoto, JP;
Abstract
A balanced/unbalanced filter module includes a switch including a first port that inputs and outputs unbalanced signals in a first frequency band, a second port that inputs and outputs unbalanced signals in a second frequency band, and a third port that inputs and outputs unbalanced signals in these two frequency bands. The switch switches a signal path. An unbalanced I/O port of a first filter that passes signals in the first frequency band is connected to the port. A port of a second filter that passes signals in the second frequency band is connected to the port. Individual balanced I/O ports of each of the first and second filters are connected to first and second branch ports with substantially the same electrical length. A balance coil for impedance matching is provided between the first and second branch ports.