Optoelectronic scanning microwave antenna

Details Optoelectronic scanning microwave antenna Optoelectronic scanning microwave antenna

1992-06-12

1993-11-16

Hajec, Donald

Communications: radio wave antennas

Antennas

Antenna components

343753, H01Q 326, H01Q 346

Patent

active

052627969

ABSTRACT:
The antenna is provided with an array of optically controlled elementary reflectors with phase-shifters. The array of elementary reflectors comprises a substrate made of a dielectrical material with low microwave losses, transparent to light, the substrate being coated, on the side exposed to the microwaves, with a layer of photoconductive elements distributed in an array and, on the opposite side, with a conductive electrode transparent to light. An optical system for the selective illumination of the photoconductive elements are used to make these elements go from an electrically insulating state to a conductive state and vice versa to modify the path of the microwave within the reflectors and enable the formation of the beam. The array of photoconductive elements forms a lattice of smaller meshes sub-dividing the lattice of the array of elementary reflectors. Thus, each elementary reflector brings together several photoconductor elements, a varyingly large proportion of which may be illuminated, thus giving it different possible phase states.

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Patent Abstracts of Japan, vol. 13, No. 97 (E-723) (3445) Mar. 7, 1989 & JP-A-63 269 807.

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