Abstract: A magnetic resonance imaging device includes a radio frequency assembly configured to transmit and receive radio frequency signals, the radio frequency assembly comprising: a radio frequency coil, which is characterized for an intrinsic bandwidth and an intrinsic resonant frequency and intended for transmitting and receiving radio frequency signals; a tunable circuit, which is associated with the radio frequency coil and configured to make it possible to adjust the equivalent impedance of the radio frequency assembly within a given impedance range, the adjustment of the equivalent impedance making it possible to adjust the resonant frequency, referred to as the adjusted frequency, and the bandwidth, referred to as the adjusted band, of the radio frequency assembly, the adjusted frequency and the adjusted band each being included in the intrinsic bandwidth so that the radio frequency assembly has a higher quality factor than the quality factor of the radio frequency coil alone.

Abstract: A device for identifying an electrical appliance when it is powered up includes a current detector coupled to an electrical power supply cable of the electrical appliance, for detecting the passage of an electrical current in the cable and generating an electrical signal. A voltage generator converts the electrical signal at the output of the current detector into a direct voltage. An RFID circuit stores identification information, coupled to an antenna suitable for receiving and transmitting signals from and to an RFID reader. The device includes a control circuit coupled to the voltage generator and to the RFID circuit, the control circuit configured for producing a change of impedance of the antenna when the direct voltage is applied, the change of impedance allowing to transmit the identification information to the RFID reader.

Abstract: A device for identifying an electrical appliance when it is powered up, comprises: a current detector coupled to an electrical power supply cable of the electrical appliance, for detecting the passage of an electrical current in the cable and generating an electrical signal; a voltage generator for converting the electrical signal at the output of the current detector into a direct voltage; an RFID circuit allowing to store identification information, coupled to an antenna suitable for receiving and transmitting signals from and to an RFID reader; the device comprising a control circuit coupled to the voltage generator and to the RFID circuit, the control circuit comprising means for producing a change of impedance of the antenna when the direct voltage is applied, the change of impedance allowing to transmit the identification information to the RFID reader.