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:
Dec. 11, 2007
Filed:
Nov. 07, 2003
Kunihiro Kawai, Yokohama, JP;
Daisuke Koizumi, Zushi, JP;
Kei Satoh, Yokosuka, JP;
Shoichi Narahashi, Yokohama, JP;
Tetsuo Hirota, Kanazawa, JP;
Kunihiro Kawai, Yokohama, JP;
Daisuke Koizumi, Zushi, JP;
Kei Satoh, Yokosuka, JP;
Shoichi Narahashi, Yokohama, JP;
Tetsuo Hirota, Kanazawa, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A signal switching device is disclosed that is capable of transmitting signals with less signal loss while securing a good isolation characteristic. The signal switching device includes a first section formed from a superconducting material connected to a first transmission path. The first section has a smaller cross section at the input end than at the output end or, the signal switching device may include a first section formed from a superconducting material connected to a first transmission path in series, and a second section formed from a superconducting material connected to a second transmission path in parallel. The cross section of the second section is smaller than that of the second transmission path. The length of the second transmission path is determined in such a way that an input impedance of the second transmission path is sufficiently large when the second section is in a superconducting state.