Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
2006-10-03
2006-10-03
Vuong, Quochien B. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S073000, C455S078000, C455S306000, C455S307000, C455S339000, C333S101000, C333S109000, C333S136000
Reexamination Certificate
active
07116966
ABSTRACT:
First and second transmission paths P1and P2are disposed between a first port #1connected to an antenna ANT and a second port #2connected to a transceiving circuit10. The first transmission path P1includes receiving filters Rx1, Rx2, and Rx2′, an amplification circuit LNA, and 90° hybrid circuits12and14. The second transmission path P2includes a transmitting filter Tx1. A received signal amplified by the amplification circuit LNA is transmitted to the port #2via the 90° hybrid circuits12and14, but is not transmitted to the second transmission path P2. A transmission signal is transmitted from the port #2to the second transmission path P2. 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.
REFERENCES:
patent: 6756859 (2004-06-01), Kodim
patent: 2002/0086650 (2002-07-01), Haapoja
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Hattori Jun
Kubo Hiroyuki
Dickstein , Shapiro, LLP.
Lu Zhiyu
Murata Manufacturing Co. Ltd.
Vuong Quochien B.
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