Abstract: 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 F1, at least one RFID device referred to as repeater configured to receive the interrogation signal with frequency F1 and to repeat same towards at least one RFID transponder at the frequency F2, characterized in that the at least one RFID terminal includes at least one RFID reader configured to emit an interrogation signal with frequency F0 and at least one add-on RFID device configured to perform a frequency transposition from the frequency F0 to the frequency F1, the frequencies F0 and F1 being different.

Abstract: Some embodiments are directed to a system for locating an object furnished with a tag in a predetermined space. The tag is interrogatable remotely by an RFID reader. According to the invention, a zone of sound is created with an ultrasound generator. A sound wave of frequency f1?f2 is present in this zone. The tag is equipped with an acoustic sensor able to sense the signals of frequency f1-f2 and this acoustic sensor is designed together with the tag to modify the content or the level of the RFID tag response signal when the acoustic sensor receives a signal of frequency f1-f2. The RFID reader is then able to locate the object in the zone of sound when it receives the modified response signal from the RFID tag or when it no longer receives any response signal from the RFID tag.

Abstract: 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 F1, the at least one repeater is configured to repeat the interrogation signal with frequency F1 towards the at least one RFID transponder at a frequency F2 and the at least one RFID transponder is configured to emit a backscattered response signal at a frequency F3, the system being characterized in that the at least one repeater is configured to perform an exclusively analog frequency transposition from the frequency F1 to the frequency F2.

Abstract: 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 F1, at least one RFID device referred to as repeater configured to receive the interrogation signal with frequency F1 and to repeat same towards at least one RFID transponder at the frequency F2, characterised in that the at least one RFID terminal includes at least one RFID reader configured to emit an interrogation signal with frequency F0 and at least one add-on RFID device configured to perform a frequency transposition from the frequency F0 to the frequency F1, the frequencies F0 and F1 being different.

Abstract: 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 F1, the at least one repeater is configured to repeat the interrogation signal with frequency F1 towards the at least one RFID transponder at a frequency F2 and the at least one RFID transponder is configured to emit a backscattered response signal at a frequency F3, the system being characterised in that the at least one repeater is configured to perform an exclusively analog frequency transposition from the frequency F1 to the frequency F2.