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:
Aug. 01, 2006
Filed:
Sep. 09, 2004
Hiroshi Okazaki, Yokosuka, JP;
Tetsuo Hirota, Ishikawa-gun, JP;
Atsushi Fukuda, Yokohama, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
In a quadrature hybrid circuit which has first and second two-port circuitsandinserted between I/O ports Pand Pand between I/O ports Pand P, respectively, and third and fourth two-port circuits inserted between I/O ports Pand Pand between I/O ports Pand P, respectively, and which is configured so that under the condition that the I/O ports Pto Pare matched, a high-frequency signal fed via the I/O port Pis divided between the I/O ports Pand Pand the divided two signals are output 90° out of phase with each other but no signal is provided to the I/O ports P, there are provided SPST switchesandresponsive to external control to control electromagnetic connections or coupling across a plane of symmetryof the quadrature hybrid circuit passing through intermediate points of symmetryandof the third and fourth two-port circuitsand