Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1994-08-16
1997-07-29
Hajec, Donald T.
Communications: radio wave antennas
Antennas
With polarization filter or converter
343781P, 343840, H01Q 1900
Patent
active
056525974
ABSTRACT:
An electronically-scanned two-beam antenna designed for being installed on board a moving platform, and in particular a satellite. The antenna of the invention comprises a single, complex reflector whose reflectivity is responsive to the polarization with which it is illuminated, and associated with two arrays of orthogonally-polarized sources that illuminate the complex reflector using an offset configuration. The complex reflector is made up of two reflectors placed one in front of the other in the beam propagation direction. The first reflector is transparent to a first linear polarization and reflective to an orthogonal polarization, while the second reflector is reflective at least for the first polarization. The two resulting beams thus propagate in different directions, both parallel to the trajectory of the platform. Electronic scanning is provided in a plane perpendicular to the orbit plane. The invention is applicable to stereoscopic radars for observing the earth from a satellite, and also to radiometry.
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J. Richard et al, "Observation de la terre depuis l'espace a l'aide d'instruments hyperfrequences actifs", L'onde Electrique, vol. 72, No. 6, Nov. 1992, pp. 29-38.
Alcatel Espace
Hajec Donald T.
Ho Tan
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