Transmitting-receiving circuit for radiocommunication apparatus,

Details Transmitting-receiving circuit for radiocommunication apparatus, Transmitting-receiving circuit for radiocommunication apparatus,

1995-08-29

1998-07-21

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 82, 455 83, 333103, 333126, H04B 148

Patent

active

057846871

ABSTRACT:
A changeover switch switches connection between an antenna and a transmitter amplifier and connection between the antenna and a receiver low noise amplifier, from one to the other. A first wire having characteristic impedance of 50 .OMEGA. connects the antenna and the changeover switch. A receiver matching circuit matches input impedance of the receiver low noise amplifier with the output impedance of the transmitter amplifier. An antenna side matching circuit matches the input impedance of the receiver low noise amplifier, which is matched with the output impedance of the transmitter amplifier by the receiver matching circuit, and the output impedance of the transmitter amplifier with the characteristic impedance of the first wire. The transmitter amplifier is connected with the changeover switch via a first coupling capacitance, and the receiver matching circuit is connected with the changeover switch via a second coupling capacitance.

REFERENCES:
patent: 4055807 (1977-10-01), Priniski et al.
patent: 4764726 (1988-08-01), Misic et al.
patent: 4973940 (1990-11-01), Sakai et al.
patent: 5054114 (1991-10-01), Erickson
patent: 5375256 (1994-12-01), Yokoyama et al.
Muraguchi et al., "1.9 Ghz-Band Low Voltage and Low Power Consumption RF IC Chip-Set for Personal Communications", Proceedings of IEEE Vehicular Technology Conference, Jun. 8-10, 1994.

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