Codatex RFID Sensor for NXT (http://www.codatex.com/lego-sensor.html) also works with the EV3 (at least with LeJOS and RobotC) but there is no driver yet for ev3dev ...

Retailers today rely on a wide range of technologies: video surveillance, EAS for loss prevention, RFID for inventory accuracy, and people counting for customer ...

Abstract: In this paper, we analyze UHF (RAIN) RFID tags with open dipole antennas using an equivalent circuit approach. We derive original closed form expressions for tag threshold sensitivity and ...