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Centre National De La Recherche Scientifique

Université Pierre Et Marie Curie (Paris 6)

Institut Polytechnique De Grenoble

Université Amiens Picardie Jules Verne

Sorbonne Université

Christophe Loussert

Marc Recouly

Cyril Catalanotto

Michel Talon

Philippe Martin

Smail Tedjini

Yvan Duroc

Sébastien Baey

Gianfranco Andia Vera

Narcisse Rimbault

Sylvain Collardey

Ala Sharaiha

Jean-Marc Laheurte

Anne Fladenmuller

Niamba Jean-Michel Akre

Mauro Sergio Pereira Fonseca

Mario Antônio Zancanaro

Brigitte Kervella

Benoit Poussot

Disclosed is a system for electromagnetic interrogation of RFID transponders including at least one RFID terminal configured to emit an interrogation signal at a frequency F, at least one RFID device referred to as repeater configured to receive the interrogation signal with frequency Fand to repeat same towards at least one RFID transponder at the frequency F, characterized in that the at least one RFID terminal includes at least one RFID reader configured to emit an interrogation signal with frequency Fand at least one add-on RFID device configured to perform a frequency transposition from the frequency Fto the frequency F, the frequencies Fand Fbeing different.

System for RFID transponder interrogation by frequency transposition

A radio-frequency identification device of the non-contact type, suitable for fixing to an object to be identified that includes a module with at least one electronic chip and at least one electrical and/or magnetic so-called primary antenna used to supply signals to the at least one electronic chip, and an electrical and/or magnetic so-called secondary antenna. The secondary antenna is a conductive element that forms part of the object or is produced by modifying a constituent of the object, the secondary antenna being coupled to the primary antenna without an electrical connection.

Radio-frequency identification device

Disclosed is a system for electromagnetic interrogation of RFID transponders including at least one RFID transponder, at least one so-called repeater RFID device and at least one RFID terminal, the at least one RFID terminal is configured to emit an interrogation signal towards the at least one repeater at a frequency F, the at least one repeater is configured to repeat the interrogation signal with frequency Ftowards the at least one RFID transponder at a frequency Fand the at least one RFID transponder is configured to emit a backscattered response signal at a frequency F, the system being characterized in that the at least one repeater is configured to perform an exclusively analog frequency transposition from the frequency Fto the frequency F

System for interrogating RFID transponders

Some embodiments are directed to a method and a system allowing moving tags to be discriminated from stationary tags, which can be used in the field of tracking merchandise or objects provided with RFID tags.

Method of discriminating RFID tags in motion from static RFID tags

The present invention relates to a circularly polarized directional helical antenna that is capable of being used in RFID devices and more particularly in RFID readers. The antenna is intended to transmit or receive signals in a predetermined frequency band, &#x3bb; being the wavelength associated with the minimum frequency of the predetermined frequency band. It includes a helicoidal radiating element made of conductive material extending along a longitudinal axis (A) and the axial length (H) of which is less than the wavelength &#x3bb;, and a cavity made of conductive material having an open end and a closed end and having an axis of symmetry that coincides with the longitudinal axis of the radiating element, at least one lower portion of the radiating element being arranged inside the cavity so that its lower end is in contact with the closed end of the cavity.

Circularly polarized compact helical antenna

An RFID communication system comprises an interrogator including a signal generator for generating an interrogation signal at a predetermined frequency fand a first interrogator antenna for transmitting said interrogation signal and receiving a first reply signal at a frequency f, and processing means, and a passive transponder including a first transponder antenna for transmitting said first rely signal and receiving said interrogation signal and a chip comprising nonlinear components for generating said first reply signal in response to the interrogation signal. The interrogator is arranged to receive a second reply signal whose frequency is a multiple of the predetermined frequency f, said multiple being either odd or even, said second reply frequency being generated by the nonlinear components of the transponder chip, said first and second reply signals being processed by the processing means of the interrogator in order to complete or improve the functionality of the system.

RFID communication system

Growing community of inventors

Aix-en-Provence, France

Christophe Loussert