Radio-frequency identification device
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.
1. A contactless radio-frequency identification system for identifying an object the system comprising:
an object to be identified, wherein the object comprises an electrical and/or magnetic secondary antenna;
a module fixed to the object, wherein the module comprises:
an electronic chip; and
an electrical and/or magnetic primary antenna used to supply signals to the electronic chip,
wherein the secondary antenna is a conductive element that forms part of the object, wherein the secondary antenna is coupled to the primary antenna through at least one Split Ring Resonator circuit.
2. The system according to claim 1 , wherein the module is positioned close to the secondary antenna to enable optimum electromagnetic coupling between the primary antenna and the secondary antenna.
3. The system according to claim 1 , wherein the module is positioned in relation to the secondary antenna to adapt one or more of a mechanical, chemical, thermal, and radio-electric resistance of the system.
4. The system according to claim 1 , wherein the primary antenna has a surface area between 1 mm 2 and 1000 cm 2 and a thickness between 0.2 mm and 5 mm.
5. The system according to claim 1 , wherein the electronic chip and the primary antenna coupled to the secondary antenna are configured to receive and/or transmit signals in at least any one of the following frequency bands:
the frequency band between 120 KHz and 135 KHz;
the frequency band between 6.765 MHz and 6.795 MHz;
the frequency band between 13.553 MHz and 13.567 MHz;
the frequency band between 26.957 MHz and 27.283 MHz;
the frequency band between 40.660 MHz and 40.700 MHz;
the frequency band between 433.050 MHz and 434.790 MHz;
the frequency band between 865.6 MHz and 867.6 MHz;
the frequency band between 840.5 MHz and 844.5 MHz;
the frequency band between 902 MHz and 928 MHz;
the frequency band between 952 MHz and 952.6 MHz;
the frequency band between 2.4 GHz and 2.5 GHz;
the frequency band between 5.725 GHz and 5.875 GHz;
the frequency band between 24 GHz and 24.25 GHz;
the frequency band between 61 GHz and 61.5 GHz;
the frequency band between 122 GHz and 123 GHz; and
the frequency band between 244 GHz and 246 GHz.
6. The system according to claim 1 , wherein the conductive element is selected from the group consisting of: a conductive part of a surgical instrument; a conductive part of a tool, a conductive part of an electronic appliance; a conductive arm of a pair of spectacles; a metal identification place equipped with a slot; a metal arch or heel of a shoe; a metal part in a neck of a bottle; a conductive wire of a bra; a conductive part of a piece of luggage; a metal protuberance or a slot in a tire bead; a metal wire in a luggage tag cord; a metal part of a gas cylinder; a metal part of a metal prosthesis; a metal part of a tire; and a metal part, already acting as an antenna, of an electronic appliance.