Thomson-lgt Laboratoire General Des Telecommunications

Thomson-lgt Laboratoire General Des Telecomm.

Guy Bastard

Maurice Loiseau

Claude Cluniat

Jean-Jacques Lombard

The antenna system for direct broadcasting satellite reception is formed by a parabolic reflector associated with source means, the reflector being positioned and held by means of a supporting foot formed by a hollow, tubular body fixed at its upper part to the rear central zone of the reflector and hinged at its lower part to a pedestal around a horizontal axis to define the elevation of the antenna. The pedestal includes a rotationally movable part to define the azimuth of the antenna. The tubular body of the pedestal supports a section sufficient to contain all the circuits associated with the antenna.

Antenna system for reception from direct broadcasting satellites

The disclosed antenna is designed notably for the emission of television and radio broadcast signals in the decimetrical wavebands. It comprises: a vertical, central supporting tube, a plurality of identical radiating networks evenly distributed around the central tube, each consisting of a vertical bifilary line symmetrically supplying, supporting and coupling a plurality of horizontal dipoles evenly distributed along this bifilary line, and, a system for the distribution of equiphase, equal power, identically and simultaneously supplying the radiating networks through a single coaxial supply line. The antenna has a reflector thus substantially reducing its weight and its windward surface as compared with standard antennas with panels generally used in this band. Advantageously, these antennas are superimposed and enclosed in a sealed radome which is substantially cylindrical and self-supporting and superimposable. This antenna gives an omnidirectional diagram with 0.9 dB between 460 and 860 MHz and can radiate 5 to 7 kW per antenna element.

Growing community of inventors

Garches, France

Guy Bastard