RF duplexer bypassing techniques for transceivers

Details RF duplexer bypassing techniques for transceivers RF duplexer bypassing techniques for transceivers

1996-01-26

1997-11-18

Faile, Andrew

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 83, 333101, H04B 144

Patent

active

056898177

ABSTRACT:
Improved RF switching techniques operate in conjunction with an existing cellular telephone having an RF amplifier, an antenna, receiver circuitry, a duplexer, and a battery. The duplexer has a first port adapted for connection to the receiver circuitry, a second port adapted for connection to the RF amplifier, and a third port adapted for connection to the antenna. The improved RF switching techniques are characterized by a first switch, a second switch, and a battery of less than 6.0 volts. The first switch, coupled to the RF amplifier, connects the RF amplifier to any one of the antenna and the second port of the duplexer. A second switch, coupled to the antenna, connects the antenna to any one of the RF amplifier and the third port of the duplexer. During transmit-only operation, the first switch connects the RF amplifier to the antenna. During receive-only operation, and also during transmit-receive operation, the first switch connects the RF amplifier to the second port of the duplexer and the second switch connects the antenna to the third port of the duplexer.

REFERENCES:
patent: 4914714 (1990-04-01), Tamura
patent: 4982442 (1991-01-01), Sarokhanian

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