Université De Rennes 1

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Bouygues Telecom

Centre National De La Recherche Scientifique

Thomson-csf

Nokia Technologies Oy

Thales

Université De Rennes I

Mohamed Himdi

Franck Colombel

Sébastien Palud

Xavier Castel

Eduardo Motta Cruz

Evgueni Kaverine

Jean-Pierre David

Daniel Gaudin

Thierry Guignard

Olivier Lafond

Antoine Chauloux

Jean-Pierre Daniel

Yaakoub Taachouche

Cyrille Le Meins

Vincent Hayart

Jean-Philippe Dessarce

Antoine Jouade

Jean Philippe Dessarce

Benjamin Fuchs

Sebastien Palud

Julien Hautcoeur

Sébastien Rondineau

The invention concerns an antenna, comprising at least two non-ferrous metal plates, at least one first plate forming a radiating portion and a second plate forming a mass plane, at least one substrate, arranged between the mass plane and the radiating portion, and an excitor of length at least equal to the thickness of the substrate, extending between the mass plane and the radiating portion and connected to the radiating portion, and adapted to supply the antenna, characterised in that the substrate is a dispersive ferromagnetic substrate, called dispersive ferrite presenting, as magnetic features, a high relative magnetic permeability comprised between 10 and 10,000 and a high magnetic loss tangent greater than 0.1, said antenna comprising means for gradually and locally reducing magnetic features of the dispersive ferrite.

Antenna with partially saturated dispersive ferromagnetic substrate

The disclosure relates to a ferrite antenna comprising at least one main contour, comprising at least one first winding referred to as main winding, at least one first ferromagnetic rod referred to as main ferromagnetic rod and a tuning system, each main winding being wound around a main ferromagnetic rod and connected to the tuning system comprising a capacitor connected in parallel with the main winding. The ferrite antenna further comprises a non-resonant secondary contour, comprising a secondary winding separated electrically from each main winding and a secondary ferromagnetic rod around which the secondary winding is wound, and each main ferromagnetic rod and the secondary ferromagnetic rod are arranged parallel to one another so as to make it possible for a magnetic coupling of each main winding with the secondary winding.

Antenna with ferromagnetic rods wound and coupled together

A Frequency-tunable and slot-fed planar antenna is proposed. The antenna includes resonant patch, a first dielectric layer, a ground plane having a first slot for each linear polarization, a second dielectric layer and a transmission line having, for each first slot, an end strand extending beneath the first slot. The antenna is frequency tunable for each linear polarization through at least one variable capacitance element. The matching of the antenna varies, for each linear polarization, as a function of a bias voltage applied to the variable capacitance element(s). The antenna includes, for each linear polarization, at least one second slot extending along the first slot. The end strand of the transmission line extends between the first slot and second slots. The at least one second slot creates an additional resonance.

Frequency-tunable and slot-fed planar antenna, and satellite-based positioning receiver comprising such an antenna

An antenna has a predetermined operating frequency, corresponding to a predetermined wavelength, and the antenna includes: a conductive sectoral horn including one open end built into a floorplan; short-circuited radiating slots, built into the floorplan, on either side of the open end; and conductive louvres, arranged above the slots and the open end, and configured to be deployed mechanically in a continuous manner to modify a radiation pattern of the antenna. The antenna can be, for example, used in stations for testing electromagnetic fields.

Antenna with mechanically reconfigurable radiation pattern

A log-periodic antenna including one set of three radiating elements with log-periodic patterns, each radiating element including a succession of radiating dipoles distributed on either side of a rectilinear electrically conducting line, perpendicular to the line, a first radiating element having a rectilinear electrically conducting line substantially perpendicular to the first face of the substrate, the first ends of the electrically conducting lines of the various radiating elements being substantially aligned along a direction parallel to the first face, the rectilinear electrically conducting lines of the second and third radiating elements being situated in a same plane as the rectilinear electrically conducting line of the first radiating element and inclined with respect to the electrically conducing line of the first radiating element, the radiating dipoles of the three radiating elements being substantially perpendicular to the plane which contains the rectilinear electrically conducting lines of the three radiating elements.

Log-periodic antenna with wide frequency band

The invention relates to a repeater system () for relaying the exchanges between a base station mobile telecommunication network and a user terminal, comprising an outside antenna () that can communicate with the base station, as well as retransmission means () connected to the outside antenna, wherein the retransmission means () are designed to act as the interface between the outside antenna () and an inside antenna () that can communicate with the user terminal to retransmit the signals received by either one of the antennae destined for the other antenna, characterized in that the outside antenna is an optically transparent planar antenna integrated into an optically transparent panel () used for the indoor lighting of a building.

Repeater system with transparent antenna integrated into a glass pane

The invention relates to a printed antenna comprising a ground plane, a substrate stacked to the ground plane, a metal deposit made on the substrate in order to form therein a resonating patch (), and a means of supplying to excite the resonating patch, characterized in that the patch has dimensions that are adapted for the patch to be able to radiate in both upper electromagnetic modes TMand TM, and in that the means of supplying makes it possible to excite the patch on an excitation point () arranged along the patch so that the patch resonates in a single of said upper electromagnetic modes, by inducing this way a dual-beam radiation diagram with, in the same plane orthogonal to the patch, two main misaligned and symmetric lobes in relation to the normal to the patch.

Printed antenna having a dual-beam diagram

Broadband printed array antenna

Growing community of inventors

Rennes, France

Mohamed Himdi