Measurement of harmonic distortions and impedance of HF RFID chips

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 S₂₁ parameter, and a simple equivalent model of integrate circuit is applied.