Daimler Chrysler Ag

Messerschmitt-bolkow-blohm Gmbh

Astrium Gmbh

Messerschmitt-boelkow-blohm Gmbh

Daimler-benz Aerospace Ag

Norbert Nathrath

Helmut Wolf

Ludwig Haas

Peter Edenhofer

Manfred Galka

Dietmar Fasold

Juergen Habersack

Manfred Lieke

Luc Duchesne

Bernd Abt

Detlev Blaschke

Thomas Kutscheid

A centrally fed reflector antenna system has an effective reflector surface shaped so that the maximum of the copolar far field lies on the illuminated coverage area corresponding to the far field requirements, and the minimum of the copolar near field lies at the feed system, e.g. at the aperture of a feed horn.

Centrally fed antenna system and method for optimizing such an antenna system

In a process for manufacturing gratings for polarization-selective reflectors a linear grating is constructed via a known depositing machine in the form of a wire which is continuously deposited side-by-side on a reflector shape. The shell is subsequently constructed such that the previously constructed grating is partially embedded in the shell. The grounding of the grating takes place outside the reflector by connecting (soldering/clamping) the projecting ends of the grating wire to a grounding wire or grounding band.

Process for manufacturing polarization-selective reflectors

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 device for adjusting the polarization plane in an antenna feed system is disclosed. The rotary device uses flexible waveguides which permits rotation of the polarization plane over a large angular range.

Apparatus for adjusting the polarization plane of an antenna

A polarization separating reflector is constructed for use in microwave transmitting antennas or in microwave receiving antennas. The signal supply to the transmitting antennas and the signal retrieval from the receiving antennas may be symmetrical or nonsymmetrical. Such antennas may or may not be equipped with subreflectors. Such antennas have a polarization selectively reflecting lattice structure on or within a dielectric carrier. This antenna structure is resonantly constructed out of separate dipoles having different lengths, preferably in the form of a linear dipole lattice. The dipoles are arranged in a staggered manner, colinearly, or at an angle relative to a reference line, such as the vertical, as desired.

Polarization separating reflector, especially for microwave transmitter

Growing community of inventors

Taufkirchen, Germany

Norbert Nathrath