H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/95
H04B 1/10 (2006.01) H01Q 3/26 (2006.01) H04B 1/12 (2006.01)
Patent
CA 2036482
An interference cancellation system for cancelling at least two interfering signals received simultaneously and which is adapted to be connected to a radio receiver system having a receiver antenna, a receiver and a receiver transmission line interconnecting the receiver antenna and the receiver includes an auxiliary antenna, a first directional coupler connected to the auxiliary antenna, a second directional coupler connected to the receiver transmission line, a synchronous detector connected to the first and second directional couplers, a signal controller connected the synchronous detector and a subtractor connected to the receiver transmission line and to the signal controller. The auxiliary antenna has a non-zero phase relationship for the two interfering signals relative to the receiver antenna. The auxiliary antenna is spaced apart from the receiver antenna a predetermined distance so that the two interfering signals are received by the two antennas with a phase difference which is equal and opposite to that which is introduced by the auxiliary antenna. As a result, the two interfering signals are received in the interference cancellation system in the same phase relative to the receiver antenna.
American Nucleonics Corporation
Borden Ladner Gervais Llp
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