Microwave receiving antenna array having adjustable null directi

Details Microwave receiving antenna array having adjustable null directi Microwave receiving antenna array having adjustable null directi

1987-05-15

1988-12-13

Sikes, William L.

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

343757, 343844, 343853, H01Q 300

Patent

active

047914289

ABSTRACT:
An antenna array for receiving microwave signals is provided that is particularly designed for use in television receive only (TVRO) satellite earth stations. The array comprises a plurality of identically-directed microwave antenna elements arranged in a plane perpendicular to their common primary receiving direction. Each antenna element includes an integral low-noise amplifier (LNA). Outputs of the LNAs are combined to produce a composite output signal which provides maximum response to microwave radiation arriving from the common primary receiving direction of the elements and null responses to microwave radiation arriving from particular other directions. The array includes means for rotating the elements about an axis parallel to the common primary receiving direction. Such rotation effectively adjusts the angle between the primary receiving direction of the array and a null-response direction disposed in a plane perpendicular to the plane of the array. Interfering microwave signals or noise emanating from a source located in an angular direction that is slightly different from the primary receiving direction of the array can thereby be adjustably nullified by rotating the array about its primary receiving direction axis.

REFERENCES:
patent: 2644158 (1953-06-01), Thrift

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