Improvement of HF RFID detection for small and misaligned tag

Megdouda Benamara (1) , Marjorie Grzeskowiak (1) , M. Salhi (1) , Gaelle Bazin Lissorgues (1) , A. Diet (2) , Yann Le Bihan (2)

1 ESYCOM - Electronique, Systèmes de communication et Microsystèmes
2 GeePs - Laboratoire Génie électrique et électronique de Paris

A design of a reader antenna is proposed to optimize HF RFID range detection in parallel and perpendicular configuration. The reader antenna has a surface of 500 cm2, the tag corresponds to 0.7% of the reader surface. For passive RFID system, if the reader antenna does not provide the threshold energy to the tag, this one will not be detected. This is the case of the misalignment systems with great difference size antenna. Another problem limiting RFID detection is the different possible tag orientations. In perpendicular configuration, the detection is weak, the tag can only be detected above the edges of the antenna. These limits are minimized in this work by using a multiple loop antenna including resonators. Electrical model is developed to calculate the equivalent mutual inductance of the system from the impedance matrix: the measured results confirm the simulated ones. The detection measurements validate the improvement.

Keywords: RFID; Coil; Mutual inductance; Detection

Domains: Electromagnetism

Megdouda Benamara, Marjorie Grzeskowiak, M. Salhi, Gaelle Bazin Lissorgues, A. Diet, et al.. Improvement of HF RFID detection for small and misaligned tag. 2016 22nd International Conference on Applied Electromagnetics and Communications (ICECOM), Sep 2016, Dubrovnik, Croatia. pp.1-5, ⟨10.1109/ICECom.2016.7843885⟩. ⟨hal-01691602⟩