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Institut Polytechnique De Grenoble

Marc Recouly

Christophe Loussert

Michel Talon

Cyril Catalanotto

Smail Tedjini

Yvan Duroc

Gianfranco Andia Vera

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

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

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

La Ciotat, France

Marc Recouly