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:
May. 22, 2007
Filed:
Feb. 13, 2004
Shigeru Kemmochi, Saitama-ken, JP;
Mitsuhiro Watanabe, Meerbusch, DE;
Hiroyuki Tai, Tottori-ken, JP;
Shigeru Kemmochi, Saitama-ken, JP;
Mitsuhiro Watanabe, Meerbusch, DE;
Hiroyuki Tai, Tottori-ken, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A switch circuit for switching the connection of the receiving or transmitting circuits of two communication systems to an antenna circuit, which comprises first and second switch means having two switching elements, the first switch means comprising a first inductance element between a port connected to the antenna circuit and a port connected to the second switch means; the second switch means comprising a second inductance element between a port connected to the first switch means and a port connected to a receiving circuit of a first communication system, and a transmission line constituting the first inductance element having a lower characteristic impedance than that of a transmission line constituting the second inductance element.