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RFIDs are used in a multitude of applications such as tracking or identifying consumer products and their packaging.
An RFID system consists of two main parts:
A tag or transponder with a printed circuit-board (PCB) antenna
A reader unit with a larger RF antenna
The reader antenna generates an electromagnetic field that energizes a chip (IC-circuit) inside the tag. The electromagnetic field is modulated by the tag’s circuit and the modulated signal is recovered by the reader antenna.
This example illustrates the modeling of such a reader-transponder pair where the mutual inductance between the reader and transponder antennas are calculated.