Highly directive radio receiver employing relatively small anten

Details Highly directive radio receiver employing relatively small anten Highly directive radio receiver employing relatively small anten

1989-12-29

1992-09-29

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

455273, 4552781, H04B 1702, H04B 700

Patent

active

051520109

ABSTRACT:
A radio receiver having a narrow effective beamwidth includes a receiver antenna, a receiver and a receiver transmission line interconnecting the two, and an interference cancellation system having 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 and a subtractor connected to the signal controller and to the receiver transmission line. The receiver antenna is selected to exhibit an omni-directional antenna pattern, while the auxiliary antenna is selected to exhibit a null in its antenna pattern. The null is directed toward the desired signal such that any signals outside of a predetermined angle from the center of the null will be cancelled by the interference cancellation system, and the desired signal which is received within a predetermined angle from the center of the null will be substantially unaffected by the interference cancellation system.

REFERENCES:
patent: 3694754 (1972-09-01), Baltzer
patent: 3699444 (1972-10-01), Ghose et al.
patent: 4275397 (1981-06-01), Gutleber
patent: 4338606 (1982-07-01), Tada et al.
patent: 4466131 (1984-08-01), Ghose et al.
patent: 4593413 (1986-06-01), Ozaki
"Collocation Of Receivers And High-Power Broadcast Transmitters, IEEE Transactions On Broadcasting" vol. 34, No. 2, Jun. 1988.

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