Thales

Alcatel Espace

Centre National Detudes Spatiales

Didier Rene

Philippe Lepeltier

Thierry Dusseux

Michel Salvan

Pierre Bosshard

Nicolas Ferrando

Bernard Charrat

Serge Depeyre

Gilles Navarre

Judicael Pressense

Ludovic Schreider

Thierry Populus

Jean-Philippe Taisant

Victorien Belloeil

Paddy Perottino

Isabelle Faro

Alain Lasserre

Sophie Verlhac

Judicaël Pressense

Ludovic Schreinder

A method is provided which includes: defining at least one radiofrequency performance objective to be produced on a selected coverage area on the ground; producing a rigid shell having a predefined profile; producing a reflecting flexible membrane; determining, by successive iterations, N optimum local deformations to be applied at N different points of the flexible membrane; producing N rigid supporting bars of different lengths corresponding to the optimum local deformations to be applied to the flexible membrane; and positioning and rigidly fixing the flexible membrane onto the rigid shell via the N supporting bars.

Method for manufacturing an antenna reflector with shaped surface, reflector with shaped surface obtained by this method and antenna comprising such a reflector

A multi-beam antenna comprises an array of feeds illuminating a reflector, the feeds being associated in a plurality of groups. Each feed comprises a polarizer, two diplexers and four ports operating in four different colours. All the feeds belonging to the same group comprise first ports having the same first colour, or second ports having the same second colour, linked together to form a first beam and third ports having the same third colour, or fourth ports having the same fourth colour, linked together to form a second beam.

Antenna and multi-beam antenna system comprising compact feeds and satellite telecommunication system comprising at least one such antenna

The transmitting and receiving antenna comprises an array of feeds clustered by groups of four adjacent feeds along two directions X, Y of a plane, each feed comprising two transmitting ports and two receiving ports with orthogonal polarizations. For each group of four adjacent feeds, the first, or the second, transmitting ports, respectively the first, or the second, receiving ports, corresponding to a same pair of frequency and polarization values are connected two-by-two in the direction X then two-by-two in the direction Y, the four interconnected transmitting ports forming a transmitting beam and the four interconnected receiving ports forming a receiving beam.

Multibeam transmitting and receiving antenna with multiple feeds per beam, system of antennas and satellite telecommunication system containing such an antenna

A mobile-beam antenna mounting comprises a supporting base, at least one reflector and a transmission and/or reception feed. The feed is mounted in the mounting so as to be immobile relative to the supporting base and the mounting also comprises a mobile support bearing the reflector, the mobile support being mounted on the supporting base with link means suitable for displacing it about at least one fixed displacement axis passing through the phase center of the feed.

Mobile-beam antenna mounting

A mission-flexibility antenna includes a reflector and at least a first source and a second source of radiofrequency signals, which sources are arranged in front of the reflector, the reflector having a focal point and each source having a phase center, and wherein the sources are independent, fixed and connected to separate radiofrequency feed systems defining different and predefined polarization and/or operating frequency characteristics, and in that it additionally includes means of displacement and orientation of the reflector from a first position in which the focal point of the reflector is placed at the phase center of the first source to a second position in which the focal point of the reflector is placed at the phase center of the second source.

Mission-flexibility antenna, satellite including such an antenna and method for controlling the change of mission of such an antenna

The present invention relates to a multiband transmit-receive coupler-separator with a very wide band of the OMT ('OrthoMode Transducer') type for microwave-frequency telecommunications antennae. This coupler comprises a port for propagating all of the frequencies, a body and a port for propagating high-frequency bands, these three portions being coaxial, and wide-band coupling slots for propagating the low-frequency bands made in the body and each associated with a waveguide, and it is characterized in that its body joining the two ports has a shape of revolution the profile of which changes according to a multipolynomial law, constantly decreasing from the port with the largest cross section to the port with the smallest cross section. This coupler can operate in order to couple and separate very wide bandwidths (the overall use of this coupler-separator being more than one octave), and two or four wide-band coupling slots are necessary for the propagation of linear and circular polarizations after recombination.

OMT type broadband multiband transmission-reception coupler-separator for RF frequency telecommunications antennas

A compact excitation assembly for generating a circular polarization in an antenna in particular transmit and/or receive antennas such as multibeam antennas comprises a diplexing orthomode transducer and a branched coupler and is characterized in that the orthomode transducer (), or OMT, is asymmetric and comprises a main waveguide () with square or circular cross section and longitudinal axis ZZ' and two branches coupled to the main waveguide () by respectively two parallel coupling slots (), the two coupling slots () being made in two orthogonal walls of the waveguide, the two branches of the OMT being respectively linked to two waveguides () of an unbalanced branched coupler (), the branched coupler () having two different splitting coefficients (&#x3b1;, &#x3b2;) that are optimized in such a way as to compensate for the electric field orthogonal spurious components (&#x3b4;y, &#x3b4;x) produced by the asymmetry of the OMT ().

Compact excitation assembly for generating a circular polarization in an antenna and method of fashioning such a compact excitation assembly

The present invention relates to a two-frequency radiating device comprising a waveguide radiating in a first frequency range opening out into a radiating element operating in a lower, second frequency range. The invention is particularly applicable to antennas.

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Castanet, France

Philippe Lepeltier