Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1997-10-24
2000-03-07
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
342354, 455 121, G03B 1900
Patent
active
060346345
ABSTRACT:
An inexpensive high gain antenna for use on terminals communicating with low earth orbit (LEO) satellites which include an elevation table mounted for arcuate movement about a transverse axis on an azimuth turntable mounted for rotational movement about a central axis. A plurality of antenna elements forming a phased array antenna are mounted on the top of the elevation table and have a scan plane which is parallel to and extends through the transverse axis of the elevation table. The antenna may be both mechanically and electrically scanned and is used to perform handoffs from one LEO satellite to another by positioning the elevation table of the antenna with its boresight in a direction intermediate the two satellites and with the scan plane of the antenna passing through both satellites. At the moment of of handoff, the antenna beam is electronically scanned from one satellite to another without any loss in data communication during the process.
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Barraco Jean Marc
Bonnedal Magnus
Carlstrom Anders
Jostell Ulf
Karlsson Ingmar
Hellner Mark
Telefonaktiebolaget L M Ericsson (publ)
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