Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1990-02-22
1992-06-23
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
343853, H04B 106, H01Q 2100
Patent
active
051251086
ABSTRACT:
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 interferring 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.
REFERENCES:
patent: 3699444 (1972-10-01), Ghose et al.
patent: 4044359 (1977-08-01), Applebaum
"Collocation Of Receivers and High-Power Broadcast Transmitters, IEEE Transactions On Broadcasting" vol. 34, No. 2, Jun. 1988.
American Nucleonics Corporation
Belzer Christine K.
Kuntz Curtis
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