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:
Oct. 03, 2006
Filed:
Aug. 13, 2003
Jun Hattori, Takatsuki, JP;
Hiroyuki Kubo, Kusatsu, JP;
Jun Hattori, Takatsuki, JP;
Hiroyuki Kubo, Kusatsu, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
First and second transmission paths Pand Pare disposed between a first port #connected to an antenna ANT and a second port #connected to a transceiving circuit. The first transmission path Pincludes receiving filters Rx, Rx, and Rx', an amplification circuit LNA, and 90° hybrid circuitsand. The second transmission path Pincludes a transmitting filter Tx. A received signal amplified by the amplification circuit LNA is transmitted to the port #via the 90° hybrid circuitsand, but is not transmitted to the second transmission path P. A transmission signal is transmitted from the port #to the second transmission path P. This prevents oscillation of the received signal due to positive feedback. A transceiving filter device that prevents degradation in the insertion loss, noise figure, and group delay characteristics in the transmission frequency band or the receiving frequency band and that prevents oscillation, and a communication apparatus using the transceiving filter device are provided.