Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1987-06-30
1989-03-21
Sikes, William L.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343837, H01Q 346
Patent
active
048147788
ABSTRACT:
A large scan antenna, particularly for embarked use on board a satellite and for operation in the ultrahigh frequency range, of the type formed of a feed and a main fixed secondary reflector, the antenna being readily foldable into a launching configuration with a minimum of component elements, and comprising at least one guide G each formed of a first and a second parabolic secondary reflectors (12, 13) aligned optically along the axis of the wave guide G between the feed (10) and the main reflector (15), said wave guide G being on the one hand variable in length by moving at least one (13) of said secondary reflectors with respect to the other (12) along the axis (14) of the wave guide G, and on the other hand, rotatable about the axis (11) of the feed (10).
REFERENCES:
patent: 4044361 (1977-08-01), Yokoi et al.
patent: 4062018 (1978-01-01), Yokoi et al.
AlAA-84-0672, "A Beam-Steerable Antenna With an Offset Spherical Reflector for Earth Station", Watanabe, et al., pp. 117-124, 1984.
AlAA-76-303, "A Novel Earth Station Antenna for Geostationary Satellites", Akagawa, et al., pp. 451, et seq., 1976.
Balling Peter
Rammos Emmanuel
Roederer Antoine G.
Agence Spatiale Europeenne
Randolph B.
Sikes William L.
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