Low earth orbit earth station antenna
US6043788A · kind A · utility
Inventor
Key dates
| Filing date | Jul 31, 1998 |
| Grant date | Mar 28, 2000 |
| Priority date | — |
| Expiry date | Jul 31, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/20
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved very small antenna terminal (VSAT) dual-beam antenna system for use with user subscriber terminals that communicate with low-earth orbiting and other satellites. In one embodiment, the dual-beam antenna system has two offset Gregorian dual-reflector antennas that each has an ellipsoidal subreflector and a rotatable paraboloidal reflector having a focus in common with a focus of the ellipsoidal subreflector. The rotatable paraboloidal reflector couples energy to and from the ellipsoidal subreflector. An RF feed system couples RF energy to and from the ellipsoidal subreflector. Rotating apparatus rotates the paraboloidal reflector and ellipsoidal subreflector together around an azimuth axis of the antenna. The rotating apparatus independently and simultaneously rotates the paraboloidal reflector about an axis between the paraboloidal reflector and ellipsoidal subreflector which points the antenna at an orbiting satellite. A controller is coupled to the rotating apparatus that controls rotation of the paraboloidal reflector and the antenna to point the antenna toward the orbiting satellite. The two antennas are preferably mounted side-by side and the one antenna is pointed…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.