Communications: radio wave antennas – Antennas – Wave guide type
Patent
1996-07-16
1998-08-18
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Wave guide type
343761, 343839, H01Q 1300
Patent
active
057963703
ABSTRACT:
An antenna is orientable, directional and capable of use as a transmit and/or receive antenna. It includes at least one reflector, at least one source of electromagnetic radiation including means for exciting the source with two orthogonal linear polarizations and a mechanical system for positioning and holding the source and the reflector. The orientation of the antenna is made up of depointing and rotation about a preferred direction of propagation of the radiation and the mechanical system enables such rotation while keeping the source fixed, so conserving the orientation of the orthogonal linear polarization. A preferred embodiment of the antenna includes a parabolic main reflector and a hyperbolic auxiliary reflector in a Cassegrain geometry, and the mechanical system enables rotation of both reflectors about the preferred direction of radiation and holds the source fixed to conserve the orthogonal linear polarization axes of the beam. Applications include radar, direct broadcast satellites and telecommunications employing frequency re-use by polarization diversity, especially advantageous in space and airborne applications.
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French Search Report FR 139482.
Carbonell Jean-Pierre
Courtonne Veronique
Lacombe Jean-Claude
Morin Dominique
Rene Didier
Alcatel Espace
Hajec Donald T.
Phan Tho
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