公开(公告)号：FR2404345A1

公开(公告)日：1979-04-20

申请号：FR7824964

申请日：1978-08-21

Applicant: IBM

Inventor： WILD DANIEL ,  GEELLER FRITZ

IPC: H01Q19/06 ,  H04B7/15 ,  H04B10/11 ,  H04B10/118 ,  H04B7/10

Abstract: In a satellite communication system using optical carriers the down link radiation beam pattern is limited to illuminating only the receiver sites for power economy. The transmitting laser's beam pattern is shaped in such a way that the intensity distribution at the earth surface is adapted to the geographical distribution of the receiving stations. A suitably prepared hologram or set of stacked holograms storing different beam patterns is interposed in the radiation path. The antenna characteristic may be varied by selecting a particular hologram. This is accomplished by changing the beam angle of incidence by remote control.