Measurement of harmonic distortions and impedance of HF RFID chips

Abstract

In this contribution, we focus on the characterization of the nonlinearity of an HF RFID (high-frequency radio frequency identification) chip. We discuss and analyze recent measurements of the chip impedance: the HF RFID chip's response at the fundamental frequency as well as at several harmonics. The HF RFID chip's behavior is presented both versus input power and frequency (at the discrete frequencies of the harmonics). The chip impedance is extracted from the measured S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> parameter, and a simple equivalent model of integrate circuit is applied.