Antenna scanning apparatus

Details Antenna scanning apparatus Antenna scanning apparatus

1975-11-14

1977-03-01

Lieberman, Eli

Communications: radio wave antennas

Antennas

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

343777, 343840, H01Q 318

Patent

active

040104729

ABSTRACT:
A feed which is stationary relative to a parabolic reflector is located in close proximity to a prime focus of the reflector along its central axis. A moving element which is opaque to r.f. energy is moved along a path of revolution about the reflector axis, the path of revolution being located between the reflector and the stationary feed. The shape of the opaque element and the path of revolution are such that different portions of the aperture of the feed are masked as the element travels along the path of revolution. This imparts predictable scanning motion to the beam pattern which is coupled into the stationary feed. One highly useful embodiment of this invention is a construction in which the stationary feed is a secondary feed installed in a nutating feed antenna, and the nutating feed itself constitutes the opaque moving element.

REFERENCES:
patent: 2895131 (1959-07-01), Butler
patent: 2991473 (1961-07-01), Van Staaden
patent: 3500415 (1970-03-01), Bishop

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