Photo-conductive element operative in the microwave region and a

Details Photo-conductive element operative in the microwave region and a Photo-conductive element operative in the microwave region and a

1984-07-26

1987-01-13

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

338 15, 333231, H01Q 330, H01L 3108, H01P 706

Patent

active

046367942

ABSTRACT:
A steerable microwave antenna array having directional characteristics, which includes at least two antenna elements spaced from one another by a predetermined distance, each antenna element defining a controllable directional radiation pattern of a selectable intensity, and having an axis of maximum radiation intensity, and wherein the directional characteristics are derived from the super-position of the radiation patterns, the axes subtending a predetermined angle therebetween, the wherein the improvement provides for feed means connected to each antenna element, each including a photo-conductive element for a selected frequency in the microwave region, so that, upon the photoelectric elements being impinged with a selected intensity of light, the directional characteristics are changed in dependence of at least the difference in the intensity of light impinging on the photo-conductive elements, respectively.

REFERENCES:
patent: 3443103 (1969-05-01), Lakshmanan
patent: 3649855 (1972-03-01), Auld
patent: 3836712 (1974-09-01), Kornreich et al.
patent: 3878105 (1975-04-01), Palmer
patent: 4282499 (1981-08-01), De Fonzo
patent: 4423403 (1983-12-01), Miyake et al.
patent: 4462019 (1984-07-01), Ewaldt et al.
patent: 4490709 (1984-12-01), Hammond et al.
patent: 4561119 (1985-12-01), Epworth

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