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3. Remote feeding of RFID tags
For the most common applications, most RFID tags have no embedded power source. The interrogator's first task is to remotely power the tag's microchip. Depending on the frequencies used and the desired remote powering distances, this energy transfer will take place either via a magnetic field, or via an electromagnetic wave. The antennae used will therefore be mainly loops in the first case, and electrical dipoles in the second. In the case of LF and HF RFID systems, the size of the electrical antennas to be deployed is incompatible with application constraints. Closed antennas, which mainly create a magnetic field in the Rayleigh zone, are therefore preferred. On the other hand, for RFID applications in the UHF range or beyond, the system will operate more in the far field, and the size of the electric antennas is generally compatible with the geometric constraints of the applications....
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Remote feeding of RFID tags
Bibliography
Standards and norms
- Information Technology – Radio frequency identification (RFID) for object management – Part 7: Active communications parameters for a 433 MHz radio interface. - ISO/IEC 18000-7 - 2014
- Information technology – Radio frequency identification for item management – Part 4 : Parameters for air interface communications at 2,45 GHz. - ISO/IEC 18000-4 - 2015
- IEEE Standard For Low-Rate Wireless Personal Area Networks...
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
3M : http://www.3m.com
Alien technology: http://www.alientechnology.com
ASK : http://www.ask-rfid.com
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