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:
Mar. 25, 2003
Filed:
Nov. 23, 1999
Applicant:
Inventors:
Kazuo Yamashita, Mitaka, JP;
Hironori Sakamoto, Mitaka, JP;
Tomohiro Sanpei, Mitaka, JP;
Tamaki Honda, Mitaka, JP;
Hiroshi Morita, Mitaka, JP;
Assignee:
Japan Radio Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 1/500 ;
U.S. Cl.
CPC ...
H04B 1/500 ;
Abstract
An interference canceling device comprising a flat phase IF narrow band BPF. A signal which has been branched from a signal on the main line is filtered by the BPF and is recombined with the signal on the main line. Phase rotation caused by frequency separation from the pass band center frequency does not occur because the phase characteristics of the BPF are substantially flat in the pass band. Thus, interference existing not only in a pin-point frequency, but over a band of frequencies can be cancelled.