Model of an RFID System

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 for radio-frequency identification (RFID) applications.

The model uses the Magnetostatics application mode to compute the mutual inductance between the reader and transponder antennas.

Slice plot of the logarithm of the magnetic flux density and streamline plot of magnetix flux density.