Patent ID: 6252562
Filing Date: 2001-06-26
Classification: H01Q

Abstract:
A system comprising:an orbiting satellite andan antenna for retransmitting to the ground images collected by image-capture instruments of said satellite, wherein said antenna comprises;a plurality of elementary radiating antennas (1) of the type having a plurality of cords regularly distributed in a helix about one and the same generatrix of revolution as well as means for the equi-amplitude power supply of said cords, in that the axes of said plurality of elementary antennas are parallel to each other and are aligned in one and the same plane in which they are spaced regularly apart in that said plane in which said elementary antennas are distributed is intended, when said satellite is in orbit, to be perpendicular to the direction of the speed vector of said satellite and in that said antenna also comprises means (2) for phase-shifting the power supply to said elementary antennas which are able to carry out electronic steering of the elongate beam generated by said elementary antennas.