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:
Feb. 21, 2006
Filed:
Dec. 28, 2000
Shigeru Kemmochi, Saitama-ken, JP;
Mitsuhiro Watanabe, Tottori-ken, JP;
Tsuyoshi Taketa, Tottori-ken, JP;
Hiroyuki Tai, Tottori-ken, JP;
Shigeru Kemmochi, Saitama-ken, JP;
Mitsuhiro Watanabe, Tottori-ken, JP;
Tsuyoshi Taketa, Tottori-ken, JP;
Hiroyuki Tai, Tottori-ken, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A high-frequency switch circuit common to a plurality or frequency bands comprises a first high-frequency switch connected to first high-frequency signal input and output terminals and adapted to pass transmission signals of a first or a second frequency band and block received signals of the first and second frequency band; and a demultiplexer has a first high-frequency circuit which consists of a first phaser connected to the first terminal and a first bandpss filter succeeding to the first phaser, and a second high-frequency circuit which consists of a second phaser connected to the first terminal and a second bandpass filter succeeding to the second phaser. The transmission line in the first phaser has a line length such that the input impedance of the first high-frequency circuit is substantially open in the pass band of the second bandpass filter, whereas the transmission line in the second phaser has a line length such that the input impedance of the second high-frequency circuit is substantially open in the pass band of the first bandpass filter. Thus, the high-frequency switch circuit passes one of thc received signals of the first and second frequency bands and blocks the other.