Power and phase variation of backscattered RFID signal with respect to the incident power at the tagPower and phase variation of backscattered RFID signal with respect to the incident power at the tag Δημοσίευση σε Συνέδριο Conference Publication 2023-05-152021enThis research has been co-financed by the European Union and Greek national funds through the Operational Program Competitiveness, Entrepreneurship and Innovation, under the call RESEARCH – CREATE – INNOVATE (project code: T2EDK-02000).In this paper, we investigate how the incident power at the tag affects the backscattered signal that reaches the reader. It is shown experimentally and theoretically that the backscattered complex signal, i.e. magnitude and phase, changes significantly with respect to the incident power at the tag’s antenna. This effect is neglected in prior art and is due to the change of the input impedance of the tag’s front end, due to the presence of non-linear components, like the rectifier’s diodes. Measured deviation of 14dBs and phase shift of 100 degrees is reported herein. These variations might lead to large localization errors, depending on the method and the measured quantity, unless the localization algorithm accounts for the expected variability.http://creativecommons.org/licenses/by/4.0/36-392021 IEEE International Conference on RFID Technology and Applications Megalou Spyros Bletsas Aggelos Μπλετσας Αγγελος Yioultsis Traianos Dimitriou Antonis G. Institute of Electrical and Electronics Engineers Passive RFID RFID tag Modulation factor RSSI Phase