Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1992-04-06
1994-01-18
Hajec, Donald T.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343700MS, 343797, H01Q 1906
Patent
active
052802973
ABSTRACT:
An antenna suited for a communications satellite includes two separately located, mutually orthogonally polarized feed antennas such as vertically and horizontally polarized linear horns. The horns feed an active reflector antenna array. The array includes a plurality of mutually orthogonally polarized antenna elements such as crossed dipoles or square patch antenna with cross feeds for two independent orthogonal polarizations. The feeds of the antenna elements are coupled to amplifier modules. Each module includes a circulator for each polarization, coupled to a processor including a low noise amplifier, controlled phase shifter, variable gain amplifier and power amplifier. The output of the power amplifier feeds the antenna element through the circulator. The large number of radiating elements allows high power using power amplifier with relatively modest capabilities. The phase shifters of each module independently control the reradiation phase of the vertical and horizontal signals, so that a collimated beam can be independently focused to the two feed points, one for each polarization.
REFERENCES:
patent: Re28217 (1974-10-01), Malech
patent: 4684952 (1987-08-01), Munson et al.
Berard C. A.
General Electric Co.
Hajec Donald T.
Le Hoang-anh
Meise W. H.
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