Messerschmitt-bolkow-blohm Gmbh

Daimler-benz Aerospace Ag

Ludwig Haas

Helmut Wolf

Norbert Nathrath

Manfred Lieke

Klaus Moosmang

Detlev Blaschke

The invention provides a reflector antenna, especially for a communications satellite, having at least one fixed main reflector (102) with an essentially circular aperture. A fixed feed system (118) includes a horn radiator (108) with a rotationally symmetric radiation diagram and a fixed polarization direction. An auxiliary reflector may be arranged to be rotationally positionable around a main axis (E) and has a reflecting surface that is shaped as a partial surface of a nonrotationally symmetric ellipsoid with a low numerical eccentricity, which illuminates main reflector (102) elliptically with an ellipticity that is essentially constant regardless of the rotational position.

Reflector antenna, especially for a communications satellite

A horn radiator with a grooved inner surface has a mode coupler for a TE.sub.01 wave and includes four cavity resonators embedded in the grooved surface of the horn and interconnected by an annular rectangular wave guide extending around the outer surface of the horn.

Grooved horn radiator with mode coupler

Growing community of inventors

Putzbrunn, Germany

Ludwig Haas