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. 05, 2008
Filed:
Dec. 02, 2003
Ning Chen, Yokohama, JP;
Yoshiaki Tarusawa, Yokosuka, JP;
Kei Satoh, Yokosuka, JP;
Shoichi Narahashi, Yokohama, JP;
Noriyoshi Terada, Yokosuka, JP;
Toshio Nojima, Sapporo, JP;
Ning Chen, Yokohama, JP;
Yoshiaki Tarusawa, Yokosuka, JP;
Kei Satoh, Yokosuka, JP;
Shoichi Narahashi, Yokohama, JP;
Noriyoshi Terada, Yokosuka, JP;
Toshio Nojima, Sapporo, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
The invention relates to a high sensitivity receiver installed outdoors which may be used in a base station of a mobile communication system, for example. A received radio frequency signal is converted into a signal in a desired frequency band by a reception bandpass filter RXF, is subject to a low noise amplification to a desired level by a low noise reception amplifier LNA, and the amplified signal is converted into an optical signal by a laser diode LD. RXF, LNAand LDare confined in a heat shielding box. LDis cooled by cooling means to the order of critical temperature where RXF, for example, assumes a superconducting state, whereby the dynamic range is increased and stabilized.