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:
Jun. 06, 2006
Filed:
Aug. 12, 2002
Keisuke Fukamachi, Saitama-ken, JP;
Shigeru Kemmochi, Meerbusch, DE;
Mitsuhiro Watanabe, Saitama-ken, JP;
Tsuyoshi Taketa, Tottori-ken, JP;
Hiroyuki Tai, Tottori-ken, JP;
Satoru Yokouchi, Tottori-ken, JP;
Keisuke Fukamachi, Saitama-ken, JP;
Shigeru Kemmochi, Meerbusch, DE;
Mitsuhiro Watanabe, Saitama-ken, JP;
Tsuyoshi Taketa, Tottori-ken, JP;
Hiroyuki Tai, Tottori-ken, JP;
Satoru Yokouchi, Tottori-ken, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A multi-band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission/reception terminals, a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit. The multi-band antenna switch circuit includes a high pass filter having an input terminal and an output terminal and provided at least between die diplexer and the antenna terminal and including a first inductor connected between the input terminal and the ground, a first capacitor connected between the input terminal and the output terminal, a second inductor connected to the output terminal, and a second capacitor connected between the second inductor and the ground.