Satellite tracking cassegrainian antenna
AssigneeKokusai Denshin Denwa Kabushiki Kaisha
InventorsHiroshi Yokoi, Masataka Akagawa
Life of this patent
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Abstract
An antenna apparatus comprising a primary radiator having an axially symmetric field pattern, and a main reflector and a subreflector coupled to the primary radiator through a beam wave-guide path. The antenna rotating axis is aligned with the axis of the primary radiator but a little deviated from the polar axis or the earth. At least one movable beam waveguide reflector or electromagnetic lens is provided in a radio wave path between the primary radiator and the subreflector. The antenna rotating axis is adapted to be rotatable only within a small angular range. The beam wave-guide reflector or electromagnetic lens is moved to thereby deflect the antenna beam.
Claims9
An antenna apparatus comprising:
- a primary radiator having an auxiliary symmetric field pattern;
- a subreflector coupled to said primary radiator through a beam wave-guide path;
- a main reflector coupled to said subreflector through a beam wave-guide path;
- movable wave-guide means provided in said beam wave-guide path between said primary radiator and said subreflector;
- rotation means coupled to said primary radiator, said subreflector, said main reflector and said movable beam wave-guide means for rotating, within a small angular range, said primary radiator, said subreflector, said main reflector and said movable beam wave-guide means as one body about an antenna rotating axis aligned with the axis of the primary radiator but a little deviated from the polar axis of the earth;
- and
- drive means coupled to said movable beam wave-guide means for controlling said movable beam wave-guide means to deflect an antenna beam radiated from said main reflector.
Dependencies are inferred from the claim text.