Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1996-09-24
1999-04-20
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 83, 333 11, 333104, H04B 148
Patent
active
058965637
ABSTRACT:
A transmitting and receiving apparatus including a transmitting system and a receiving system which prevents fluctuations in insertion losses caused by changes in transmission power, while obviating the need for the provision of a battery and a current control circuit for providing a switching current, and suppresses losses in the transmission system so as to improve the power efficiency, and also decreases the cost of parts. The transmitting and receiving apparatus having a transmitter and a receiver sharing a single antenna is configured as follows. A circulator is provided at a feed point of the antenna between the transmitting system and the receiving system. Also, a changeover switch is disposed between a terminating resistor connected to ground and a point where the circulator and the receiver are connected so that the changeover switch can be automatically switched to the terminating resistor in response to input power supplied from the transmitter during transmission.
REFERENCES:
patent: 4380822 (1983-04-01), Broton
patent: 4641365 (1987-02-01), Montini, Jr.
patent: 5129099 (1992-07-01), Roberts
patent: 5444864 (1995-08-01), Smith
patent: 5507011 (1996-04-01), Chigodo et al.
patent: 5513382 (1996-04-01), Agahi-Kesheh et al.
Hasegawa Takashi
Kawanami Takashi
Chin Wellington
Murata Manufacturing Co. Ltd.
Sobutka Philip J.
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