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The magnetic coupling in LF systems is very similar to how a transformer works. The primary and secondary windings are the reader's and tag's antennas. However, RFID systems use air in place of a ferrite core and the windings are separated by a much wider distance. Nevertheless, the principles are the same. The antennas transfer power and signals by creating changing magnetic fields which induce voltages in a coil of wire.
PTM Published on: 2012-09-06
