Earth station aerial for satellite traffic - is fitted to rotary frame aligning to long aperture axis parallel to satellite path tangent

摘要

The earth station aerial has a feed system and a reflector with oval or rectangular aperture reflector, from which starts a radiation lobe as the aerial main beam with approx. elliptical cross section. The aerial is so mounted on a rotary frame (7) that the short axis of the radiation lobe cross section, i.e. the long axis of the aperture is aligned parallel to the satellite path with the alignment of the aerial main radiation direction. Pref. the rotary frame is fitted with hour declination angular bearing for the aerial slewing. The long axis of the aperture is orthogonal to the hour axis. The rotary frame has also an elevation azymuth angular bearing, and an extra rotary bearing (21) for the aerial main beam direction, forming an axis (20). ADVANTAGE - Improved adjustment w.r.t. secondary peak damping in direction of satellite orbital plane.