Design of 1cm2 coils for HF RFID instruments tracking with detection range improvement

A. Diet (1) , Marc Biancheri-Astier (1) , Yann Le Bihan (1) , Christophe Conessa (1) , Francisco de Oliveira Alves (1) , Marjorie Grzeskowiak (2, 3) , Megdouda Benamara (3) , Gaelle Bazin Lissorgues (3)

1 GeePs - Laboratoire Génie électrique et électronique de Paris
2 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
3 ESYCOM - Electronique, Systèmes de communication et Microsystèmes

This paper concerns an application of magnetic coupling RFID technology at 13.56 MHz (HF band) for tracking devices such as instruments. The tag size is defined to be ergonomically small compared to the hand, and fixed inside a maximum surface of 1 cm 2. The case of multiple detections is considered, and consequently the reader surface of control is considered wide enough to include several instruments at the same time during a logistic control process. The use of such a small RFID tag is almost impossible using a large reader loop of 15×30 cm 2, as chosen for the tests. The key idea of the paper is then the addition of a resonator that enables to create the mandatory physical link by means of magnetic coupling between the tag coil and the resonator coil and between the resonator coil and the reader loop. Finally the detection range is highly improved by the presence of this resonator and results demonstrate that it is possible to detect these small RFID “1 by 1 cm 2 tags” at a distance of 1.5 cm to 3 cm, depending on their orientations.

Keywords: HF RFID; Coil; Magnetic coupling

Domains: Engineering Sciences [physics]; Electromagnetism

A. Diet, Marc Biancheri-Astier, Yann Le Bihan, Christophe Conessa, Francisco de Oliveira Alves, et al.. Design of 1cm2 coils for HF RFID instruments tracking with detection range improvement. 2017 IEEE International Conference on RFID Technology & Application (RFID-TA), Sep 2017, Warsaw, Poland. pp.7-11, ⟨10.1109/RFID-TA.2017.8098862⟩. ⟨hal-01691636⟩