Isolation improvement circuit for a dual-polarization antenna

Details Isolation improvement circuit for a dual-polarization antenna Isolation improvement circuit for a dual-polarization antenna

1999-01-27

2000-10-31

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 24, 455129, 343700MS, H04B 144

Patent

active

061415391

ABSTRACT:
An isolation improvement circuit for a dual-polarization antenna, the dual-polarization antenna consisting of both a transmitter and receiver antenna for simultaneously transmitting a transmission signal and receiving a receiver signal, in which the transmitter and receiver antennas are configured so as to be mutually orthogonal either by physical or electrical orientation in order to reduce how much of the transmitter signal is picked up by the receiver antenna. The isolation improvement circuit reduces the level of transmitter signal appearing at the output port of the receiver antenna by providing a time-delayed transmission signal that destructively interferes with the transmitter signal picked up by the receiver element. The isolation circuit includes deriving a canceling signal by coupling to the transmission signal at the input port, shifting the phase of the canceling signal and using a probe antenna to radiate the canceling signal so that the canceling signal is received by the receiver antenna element.

REFERENCES:
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patent: 5264862 (1993-11-01), Kumpfbeck
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patent: 5574978 (1996-11-01), Talwar et al.
patent: 5647379 (1997-07-01), Meltzer
patent: 5815805 (1998-09-01), Crnkovic et al.

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