Holographic optical satellite communication system
US4214807A · kind A · utility
16Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1978 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | Aug 28, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/118
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.