Alcatel Espace

Thales

Alcatel

France Telecom

Societe Anonyme Dite : Alcatel Espace

Alcatel N.v.

Regis Lenormand

Gerard Raguenet

Christian Rigal

Gerard Maral

Didier Rene

Jean-Francois David

Jean-Pierre Cances

Philippe Gourlain

Alejandro Valero-Nogueria

Ronan Sauleau

Philippe Voisin

Erwan Corbel

Bernard Coulomb

Jean-Philippe Marre

Daniel Renaud

Charles Villemur

Michel Coustere

Jose Ignacio Herranz-Herruzo

Mauro Ettorre

Michel Gomez-Henry

Olivier Remondiere

Thierry Quignon

Frederic Croq

Antonin Hirsch

Olivier Maillet

Jean-Luc Almeida

Henri Favaro

Frederic Magnin

Jean-Michel Mateus

Patrick Martineau

Antoine Clerino

Michel Tatard

Jean-Claude Anne

Dominique Morin

Marc Capdepuy

Albert Cerro

Pierre Fraise

Alain Gergondey

Benoit Hanin

Jacques Neron

Jean-Claude Goupil

Marcel Billand

Jean-Michel Merour

Laurence Laborde

Paul Vincent

Alejandro Valero Nogueria

José Ignacio Herranz

An antenna with polarization switching comprises a support comprising at least two faces each supporting a plurality of waveguides fed with radiofrequency signals and pierced with apertures disposed so as to illuminate radiating elements placed some distance from the said apertures. For at least one given antenna pointing, the said support is able to toggle between at least two different configurations, the said support being configured so as to place, in the second configuration, the second face in a position identical to that taken by the first face in the first configuration, several radiating elements of the first face being, in the said position, oriented differently from radiating elements of the second face. It applies notably to the switching of antennas embedded onboard moving objects on the ground having to operate high-speed communications with a satellite, in particular a geostationary satellite.

Directional mobile antenna with polarization switching by displacement of radiating panels

An antenna with polarization switching comprising a plurality of waveguides fed with radiofrequency signals and perforated with apertures disposed so as to illuminate radiating elements placed on mobile support means in a plane that is distant from the said apertures, it being possible for the said support means to be configured according to at least two distinct configurations. The radiating elements illuminated according to one and the same configuration are adjacent, the support means being adapted for orienting the radiating elements illuminated in a first configuration according to a different direction from the radiating elements illuminated in a second configuration. The antenna applies notably to the switching of antennas onboard objects moving on the ground required to undertake high-speed communications with a satellite, in particular a geostationary satellite.

Mobile directional antenna with polarization switching

A flat scanning antenna comprises at least one slotted waveguide array comprising two dielectric substrates, one superposed above the other. The two substrates comprise the same number of waveguides, which are in mutual correspondence and communicate between them, pairwise, via corresponding coupling slots. Each waveguide of the upper substrate further includes a plurality of radiating slots, all the radiating slots being mutually parallel and oriented in the same direction and each waveguide of the lower substrate includes an individual internal supply circuit comprising an individual phase-shift/amplification electronic circuit.

Flat scanning antenna for a terestrial mobile application, vehicle having such an antenna, and satellite telecommunication system comprising such a vehicle

The invention relates to a receiving antenna for satellite telecommunications. More specifically, the invention relates to an active antenna comprising a network of elementary sources which is positioned at the focal point of a focusing reflector. According to the invention, said network of sources is disposed on a more or less spherical, concave surface S. The aforementioned arrangement can be used to: (i) improve the efficiency of the optics and (ii) enable the use of polarisation duplexers behind surface S in order to increase the spectral efficiency of the antenna.

Receiving antenna for multibeam coverage

The invention concerns an antenna with high scanning capacity. The antenna comprises a panel (,) of static radiating elements which are controlled to transmit in variable directions relative to a direction (,) perpendicular to the plane of the panel. Reflectors (,) amplify the scanning effected by the panel (,) of radiating elements. The reflectors (,) are segments of paraboloids with the same axis (,) and the same focus (,), for example.

Antenna with high scanning capacity

A unit for combining N channel signals produced by N respective separate sources, where N is an integer, comprises a collector array receiving the N channel signals in respective directions defined by array lobes associated with the collector array.

Multiplexed channel beam forming unit

A method and a system for locating ground equipment transmitting signals to a geostationary satellite, the method and the system being based on identifying the arrival directions of such signals within the coverage zone of the satellite. In the method, the arrival directions of the signals are identified by using a beam-forming active-module array antenna system on board the satellite, the system being controlled to define simultaneous beams in the radiation pattern of the antenna, the beams being superposed on one another with small offsets, the superposed beams corresponding to a limited analysis zone being illuminated within the coverage zone of the satellite, the system further being associated with a digital processing program which identifies the arrival directions of the signals which are received in the analysis zone.

Method and a system for locating ground equipment transmitting via

The invention provides a multibeam antenna comprising:

High capacity multibeam antenna with electronic scanning in transmission

The invention concerns a method of allocating a respective free radio beam channel to calling and called stations of a satellite telecommunication network. If there is no free channel on a beam forming the coverage including one given station, the method of the invention looks for free channels in each beam adjacent said beam, and allocates one of the adjacent beam free channels to the given station as soon as in an optimal subset of beams comprising all beams using the same channel as the free channel each level of isolation equal to the ratio of an antenna gain of a main lobe of a respective one of the beams of the optimal subset to the sum of the maximal antenna gains of secondary lobes of the other beams is greater than a given threshold.

Method of allocating a communication channel in a satellite network

A multifrequency radiating device comprising at least one radiating element (11) of a first type and at least one radiating element (12) of a second type, the elements being associated on a common surface (10) in order to constitute an array antenna. The radiating elements of the first type (16) are elements of the microstrip type and the elements of the second type (19, 20) are elements of the wire type, the radiating elements of the first type (16) acting in a first frequency range and the radiating elements of the second type (19, 20) acting in a second frequency range. The invention is particularly applicable to microwave antennas.

Multifrequency array with composite radiators

A earth station calling another station sends a link setting-up a request to a control station. The control station memorizes in a transformed reference system the contour of a global geographical coverage including all the earth stations together with the earth positions of the latter. Subsequent to the request, the control station simulates the optimum evolution of the radioelectric coverages of the satellite so as to include, both on emitting and receiving, the calling and called stations in respective coverages with guaranteed minimum antenna gains. The total power of the satellite and the positions of the stations are notably considered in this simulation. If the result of simulation is positive, an emission authorization is sent by the control station to the calling station, and satellite antennae are reconfigured by phase shift and power control values emitted by the control station.

Antenna beam coverage reconfiguration

An offset type active antenna having two reflectors in a periscopic configuration. A radio lens is provided at the focii of the two reflectors. It comprises a collector and a primary array that is considerably larger in size than the collector. The 'small' sources of the collector are in a geographically identical one-to-one correspondence with the 'big' sources of the primary array, and they are respectively connected together via devices for providing fine phase adjustment.

Offset active antenna having two reflectors

The invention relates to a reconfigurable transmission antenna comprising a reflector (10) for energy focussing, and an array (11) of source elements situated in the focal region of the reflector, so that the electromagnetic field is synthesized in said region, wherein a spot (SPi) is the result of radiation from a number of sources that is fixed and identical for all the spots; any one source participating at any one time in radiating one spot at the most, and high-level switching being used to reconfigure the spots by selecting the sources that participate in a given spot. Application to the space telecommunications field in particular.

Reconfigurable transmission antenna

The present invention relates to a multifrequency antenna comprising a microstrip patch first antenna (10, 11, 12) operating at one or more frequencies, and a second antenna (17) disposed in front of the antenna and using the same radiating surface and operating at a different frequency. The invention is applicable, in particular, to space telecommunications.

Multifrequency antenna, useable in particular for space

The invention relates to a space reentry vehicle high-temperature skin antenna comprising a printed antenna embedded in a tile for providing thermal protection, and fed by electromagnetic coupling. The invention is particularly applicable to space telecommunications.

High temperature skin antenna

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Blagnac, France

Regis Lenormand