Tag-Based Sensing and Positioning in Passive UHF RFID: Tag Reflection

We present a comprehensive model of the complex reflection coefficient of UHF RFID tags during modulation. The model is based on an equivalent circuit and validated using measurements of an NXP UCODEG2XM on an NXPUCODE general purpose reference antenna in an anechoic chamber. Using this model, we conduct an analysis of the influence of assembly tolerances and antenna detuning on accuracy in a frequency-domain phase-based ranging approach. The tools used in this analysis are also applicable to tag antenna based sensing and are available under GNU GPL as part of the PARIS simulation framework, a simulation tool intended to serve in the development and testing of backscatter-based sensing and positioning.

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