Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1996-04-09
1997-10-14
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 82, 455 83, 333101, H04B 146
Patent
active
056781997
ABSTRACT:
A transmit/receive radio set having a transmitter output stage, a receiver input stage, and an antenna switching device for change-over between transmission and reception by a single antenna. Two impedance transformers are provided at the output of the transmitter output stage. A switching circuit effects a change-over of the output impedance of the transmitter output stage during transmission and reception by controlling the impedance of at least one of the impedance transformers.
REFERENCES:
patent: 4633073 (1986-12-01), Selin et al.
patent: 5023935 (1991-06-01), Vancraeynest
patent: 5054114 (1991-10-01), Erickson
patent: 5193218 (1993-03-01), Shimo
patent: 5212885 (1993-05-01), Schumacher
patent: 5257411 (1993-10-01), Minasi
Circuit Ideas, Wireless World, vol. 8, No. 1469, Jan., 1975, p. 12.
Birth Winfried
Marshall Christopher
Morbitzer Holger
Saur Erich
U.S. Philips Corporation
Urban Edward F.
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