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

Commissariat a L'energie Atomique

Messier-bugatti Inc.

Michelin Recherche Et Technique S.a.

Snecma

Nexans

Messier-bugatti-dowty

Technip N-power

Thierry Thomas

Elisabeth Crochon

Jacques Reverdy

Sylvain Bacquet

Marcel Locatelli

Claude Marcel Mons

Olivier Savry

Florian Pebay-Peyroula

Rosolino Lionti

François Vacherand

Isabelle Peslerbe

Valery Poulbot

Gérard Robert

Mathieu Des Noes

Vincent Josselin

Mélanie Descharles

François Frassati

Hélène Lhermet

Jacques Bernard

Antoine Robinet

Yann Tetu

Judit Sala Sabate

Alessandro Tundo

Francois Frassati

Jean Pierre Mascia

Yann Nicolas

A system for detecting a specific relative position between a reader and a receiver, including: an inductive contactless receiver including an antenna winding and a circuit for selectively modulating a load; an inductive contactless reader including: a transceiver antenna circuit having nonzero mutual inductance with the antenna winding for the position, a communication circuit connected to the transceiver antenna circuit, a receiver antenna circuit having mutual inductance with the antenna winding that exhibits a minimum for the position, and a processing circuit for: identifying presence of a receiver by detecting nonzero mutual inductance between the transceiver antenna circuit and an antenna winding, and detecting a mutual inductance minimum between the receiver antenna circuit and an antenna winding.

Method and system for detecting a specific relative position between two objects

The invention relates to a device () for emitting energy by electromagnetic coupling which comprises: a single generator () outputting an AC electric signal between two terminals; a series of resonant modules () each including a capacitor and a first inductance, and first to fourth terminals (Ai, Bi, Ci, Di), the first (Ai) and second (Bi) terminals of a first module being connected to terminals of the generator, and the first (Ai) and second (Bi) terminals of the other module or modules being connected to the third (Ci) and fourth (Di) terminals of the module of the previous row.

System for transferring energy by electromagnetic coupling

This fluid pressure sensor includes a coil the self inductance of which varies as a function of the pressure of a fluid inside the flexible pipe. This coil includes a turn including:

Fluid pressure sensor

The method for managing a set () of communicating objects (), which are distributed such that each object () in the set () is neighboring at least one other object () in said set () so as to form a pair of neighboring objects that are capable of communicating with one another, has the following steps: activation (E) of an initial object () chosen among the objects () in the set (); propagation (E), from the activated initial object (), of a signal to each of the other objects in the set, said propagation being configured such that each of said other objects in the set has received, at the end of the step of propagation (E), said signal from at least one neighboring object belonging to said set at least once.

Method for managing a set of communicating objects allowing the propagation of a signal, notably a wake instruction, between said objects

The power stage at the output of a high-frequency generates operates in class D and comprises a voltage supply and a common earth, a first and a second switch linked to the common earth and periodically switched on at a high frequency F; these switches are linked to two common-mode inductors connected in a Guanella balun. Each common-mode inductor comprises two inductive lines with strong mutual coupling. The first switch is linked to the input of the first inductive line but not to the second, third and fourth lines and the second switch is linked to the input of the fourth inductive line but not to the first, second and third lines, the output of the first inductive line is linked to an output of the generator, the output of the fourth inductive line is linked to an internal resistor, the inputs of the second and third inductive lines are linked to the supply voltage source, the output of the third inductive line is linked to the output of the first inductive line and the output of the second inductive line is linked to the output of the fourth inductive line.

High-frequency generator

A locating device for determining a distance of an RFID tag with respect to an interface between two media comprising an inductive coupling antenna and a sensor for determining a distance between the antenna and the interface. There is an energizing circuit configured to energize the antenna to generate an electromagnetic field with various successive amplitude values and a detection device for detecting an electromagnetic field response from the RFID tag. There is a processing circuit configured to determine several pairs of information, each pair including: a distance between the antenna and the interface and a minimum electromagnetic field value detected by the detection device from the RFID tag at the determined distance between the antenna and the interface. The processing circuit also evaluates the distance between the RFID tag and the interface as a function of the several pairs.

Locating device for evaluating the distance between an RFID label and an interface

The invention relates to an inductive antenna, comprising: a first planar conductive winding () on a first surface of a substrate, said first winding being cut off at regular intervals so as to form a series of pairs of first conductors (); and a second planar conductive winding () on a second surface of the substrate, said second winding being provided opposite the first winding and cut off in a direction vertically perpendicular to that of the cutoffs of the first winding so as to form a series of pairs of second conductors (). Each pair of first conductors defines a resonant subassembly with the pair of second conductors opposite thereto, wherein each of the two first conductors of a single subassembly are electrically connected to another first conductor of another subassembly or to a terminal () of the antenna, the second conductors of adjacent pairs are not electrically connected to each other, and one end () of each first conductor is either electrically connected () to one end () of a second conductor of the subassembly in question or is not connected thereto, in which case the second conductors of the subassembly in question are electrically connected to one another.

Antenna for a moist environment

The invention relates to an inductive antenna formed from at least two pairs of segments () geometrically butted together and each comprising first () and second () parallel conductors insulated from each other, each pair having, at each end, a single terminal for the electrical connection of its first conductor to that of the neighboring pair, in which said pairs are of a first type (), in which the conductors are interrupted approximately at their mid-points so as to define the two segments, the first (respectively second) conductor of one segment being connected to the second (respectively first) conductor of the other segment of the pair, or of a second type, in which the first conductor is interrupted approximately at its mid-point so as to define the two segments, the second conductor not being interrupted.

High-frequency antenna

A method for managing a data transfer system includes recovering energy at peripheral devices, and wireless transfer recovered energy to a base by synchronizing RF signals transmitted by double-loop antennas. Synchronizing includes implementing a listening phase to detect a radio-frequency signal transmitted by said central base, and either sending an RF signal that is synchronous with the detected signal or transmitting a signal at a predetermined frequency depending on whether an RF signal is detected at the base. The method includes, in response to receiving a signal from the peripheral device at that frequency, causing the base to recover the received signal and to re-transmit at the predetermined frequency to the peripheral devices. This signal synchronization enables simultaneous energy transfer from peripheral devices to the central base while avoiding mutually destructive effects between said signals.

Data transfer system and associated management method

The invention relates to the locating and identifying of objects with radiofrequency communication by inductive coupling, without electrical contact, between a reader and a tag. The device includes an array of N fixed RFID markers of RFID tag type, with inductive antennas placed at known positions, N being an integer greater than 1 and an RFID tag reader provided with a fixed reading inductive antenna passing in proximity to the N markers. The position of the N markers with respect to the inductive reading antenna is such that the mutual inductance between the inductive antenna of any marker and the inductive reading antenna is zero when no object to be located is present in the vicinity of the array of markers, and nonzero when an RFID tag is present in the vicinity of the marker considered. A coupling is established in the presence of a mobile tag in proximity to a marker.

Device for locating objects by RFID communication

The invention relates to a method for encoding contactless communication data from a transponder to a reader via charge modulation, in the form of a set of modulation patterns, each modulation pattern being a series of charge levels of a predefined length used for physical encoding, having a duration of n carrier periods (T), including a series of at least two charge levels, having a minimum pulse width (w) corresponding to the shortest duration of a single charge level in the pattern, and having a retromodulation rate (t) corresponding to the ratio between the retromodulation time and the duration of a pattern, characterized in that the number (k) of patterns is greater than four, the minimum pulse widths (w) of at least two patterns are different, and the retromodulation rates (t) of at least two patterns are different. The invention also relates to a device for implementing the method.

Method for encoding contactless communication data from a transponder to a reader via charge modulation, in the form of a set of patterns and device for implementing same

Signal transmission and/or reception device, by contactless inductive coupling comprising at least one structure forming one or several antennas, said structure comprising a plurality of conducting links () in at least two parallel and distinct planes, a first plurality of said conducting links forming a first conducting circuit () through which a current (I) will circulate, and a second plurality of said conducting links forms at least one second conducting circuit (), distinct from said first circuit, and through which a current (I) will circulate, the links being arranged such that the coefficient coupling between pairs of said circuits is zero or at least less than 5% or less than 1%.

Large band inductive antenna for contactless communication systems

The invention relates to contactless communication systems between a moving object and a reader, in particular systems in which the moving object is a chip card or an identification tag. To enhance communication security, the card reader transmits, from a radiofrequency transmission antenna separate from the main communication antenna, a disturbance signal having the same frequency and modulation type characteristics as the response signal expected from the card to the reader; the electromagnetic coupling between this separate antenna and the antenna of the reader is, however, such that the latter does not 'see' the transmitted disturbance but detects only the response from the card; on the other hand, the environment between the card and the reader sees the response from the card only mixed with the disturbance signal.

System for secure communication between a contactless card reader and a card

An antenna includes a central loop and four adjacent coplanar eccentric loops. The central loop creates a magnetic field that is essentially perpendicular to the antenna. The centres of gravity of the four eccentric loops are essentially located on the periphery of the central loop and the eccentric loops are supplied in such a way as to predominantly create a rotating field in a plane parallel to the plane of the antenna. The eccentric loops can be associated in pairs of non-adjacent loops in such a way as to generate electromagnetic fields of opposite phases in the respective pair. In this way, the two loops of a pair can be connected such that the same current flows through them in opposite trigonometric directions. A radiofrequency generator can supply first and second excitation signals alternately on two outputs, respectively to the central loop and to the eccentric loops.

Flat plate antenna with a rotating field, comprising a central loop and eccentric loops, and system for identification by radiofrequency

Radio-frequency transmission device comprising a transmission antenna () and a receiving antenna (), characterized by comprising one or more passive resonant circuits () positioned between the transmission and receiving antennas ().

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Varces Allieres et Risset, France

Thierry Thomas