Coupling cancellation for antenna arrays

Details Coupling cancellation for antenna arrays Coupling cancellation for antenna arrays

1989-05-01

1991-09-10

Gregory, Bernarr E.

Communications: radio wave antennas

Antennas

With electrical shield

343705, 343708, 343767, 343782, 343872, H01Q 152

Patent

active

050477870

ABSTRACT:
An arrangement for providing RF coupling cancellation between an array of antennas of a missile is shown. The present invention includes positioning a dielectric material across a portion of the axis of the waveguide antennas of a missile. The dielectric material induces further coupling which is equal to and opposite in phase to coupling normally present between the receiving and transmitting antennas of an array. The two couplings are approximately 180 degrees out of phase and cancel each other. As a result, a high degree of isolation is obtained between antennas of an array. This enables the missile to detect targets with a high degree precision. Further, a radome of QFELT.RTM. material may be applied over the dielectric material to prevent the dielectric material from ablation during high velocity flight.

REFERENCES:
patent: 2947987 (1960-08-01), Dodington
patent: 3277488 (1966-10-01), Hoffman
patent: 4328502 (1982-05-01), Scharp
patent: 4748449 (1988-05-01), Landers, Jr. et al.

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