Thomson-csf

Thales

Michel Soiron

Claude Chekroun

Thierry Dousset

Georges Guillaumot

Philippe Naudin

Jo&euml;l Herault

G&eacute;rard Garnier

The present invention relates to a cylindrical electronically scanned antenna. The antenna has: a set of radiating guides () arranged in cylinder form for, producing the antenna beam (); An array () of 3 dB couplers is arranged in waveguide form. The inputs of the array are lit by a set of microwave feeds (). The output of each coupler is coupled to the input of a radiating guide (). An array of pairs of phase-shifting cells is, each coupled to a 3 dB coupler. An incoming wave from the microwave feeds () is phase-shifted by a controllable phase shift &#x394;&#x3c6;. The angular offset of the antenna beam () is dependent on this phase shift &#x394;&#x3c6;. The invention is typically applicable for equipping masts, in particular on ships.

Cylindrical electronically scanned antenna

This invention relates to an apparatus for emission and/or reception of electromagnetic waves for aerodynes, characterised in that it comprises a blade antenna on the top of the fuselage of the aerodyne, a principal reflect-array arranged horizontally at the bottom of the blade antenna, a principal illumination horn arranged at the summit of the blade antenna, the horn illuminating the principal reflect-array, two secondary reflect-arrays arranged vertically on each side of the faces of the blade antenna, two secondary illumination horns arranged at the bottom of the blade antenna in the plane of the principal reflect-array, each horn illuminating one of the secondary reflect-arrays, each reflect-array reflecting waves emitted by the illumination horn illuminating it.

Apparatus for emission and/or reception of electromagnetic waves for aerodynes

A microwave phase-shifter including a coupler in a waveguide form, at least one pair of phase-shifter cells, and a conductive strip positioned between each phase shifter cell and configured with a conductive plane to form a guided space where a wave cannot propagate. An incident wave entering a first input of the coupler is subdivided into two waves. Each of the waves are reflected on an elementary cell with identical phases to the incident wave and are recombined into a resultant phase-shifted wave prior to exiting the coupler by an output juxtaposed with the first input.

Microwave phase-shifter and electronic scanning antenna with such phase-shifters

A multiple-beam electronic scanning antenna including an array of phase-shifters (2, D,). The N simultaneous beams are obtained in N directions by a law of excitation (f,) applied to each computed phase-shifter (D,) by summing the phase laws &psgr;,, &psgr;,, . . . &psgr;,, . . . &psgr;,associated respectively with each 1, 2, . . . k, . . . N order direction and by applying the resultant phase-shift (&psgr;t,) to the phase-shifter, without applying the resultant amplitude modulation (&rgr;,). The multiple-beam electronic scanning antenna especially is applicable to uniquely phase-controlled antennas in satellite or terrestrial communications requiring simultaneous communications with several variable sites.

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Chavenay, France

Michel Soiron