Apparatus for enabling the duplex operation of a transmitter and receiver
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United States of America Patent
Stats
-
May 28, 1985
Grant Date -
N/A
app pub date -
Dec 13, 1982
filing date -
Dec 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for enabling full duplex operation of a co-located transmitter and receiver on the same frequency. Directional couplers in the transmit and receive transmission lines (or line) provide continuous samples of transmit and receive signals to an adaptive combiner. The combiner includes a ninety degree quadrature hybrid for producing in-phase and quadrature signals from the transmit sample, inverters for each of the in-phase and quadrature signals to selectively invert them, attenuators to controllably attenuate each of the in-phase and quadrature signals, and a summer to add the selectively inverted and attenuated in-phase and quadrature signals with the receive signal sample to cancel portions of the receive signal deriving from the transmit signal.
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