UHF RFID Positioning with Square Antenna Trajectory

This paper presents a phase-based method for UHF-RFID localization of passive tags with measurements gathered along a square antenna trajectory. The tag position is retrieved by considering the phase curve maximum and an operator accounting for its variability. A numerical analysis is carried out to assess the method capability for different system parameters. Then, performance in a real indoor scenario is demonstrated through a measurement campaign with a Cartesian robot moving the reader antenna above the tag plane.