An RFID System

Application ID: 1264

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.

This model example illustrates applications of this type that would nominally be built using the following products: