H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/95
H04B 1/10 (2006.01) H04B 1/12 (2006.01)
Patent
CA 2032647
An interference cancellation system 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 exhibits a cardioid antenna pattern having a null, and is mounted coaxially with the receiver antenna, which is a directive antenna. The null of the auxiliary antenna is directed toward a desired signal and parallel with the boresight of the receiver antenna. Interfering signals received outside a predetermined angle from the receiver antenna boresight are cancelled by the interference cancellation system, but a desired signal received within the predetermined angle of boresight is not cancelled.
American Nucleonics Corporation
Borden Ladner Gervais Llp
LandOfFree
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