Flexible serialized complementary coils for the detection of moving LF RFID tags

Antoine Diet (1) , Marjorie Grzeskowiak (2) , Marc Biancheri-Astier (1) , Yann Le Bihan (1) , Eric Labouré (1) , Madjda Bouklachi (1) , Gaelle Bazin Lissorgues (2)

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

This paper focuses on bats detection, tagged at low frequency (134.2 kHz) with glasstags (typically : length 15 mm and radius 1 mm). The physical link is magnetic coupling. We propose the design of a reader antenna based on a multi-coil structure. The goal is to obtain the highest surface of detection, at a distance of 10-15 cm, i.e. defining a so called “volume of detection”. The cylindrical volume of the glasstags involves a high sensitivity to the magnetic field orientation. As the bats are flying, the tags equivalent surfaces are considered with a random orientation. Using complementary coils principle enables to detect fruitfully the glasstags in two perpendicular orientations named HM (horizontal mode) and VM (vertical mode). We propose the design of a flexible reader antenna structure by means of an adhesive copper tape fixed on a cloth. The prototype is designed after CST simulations and empirical formula evaluations. Measurements show a good agreement with the modelling and tests of detection are performed with the proposed reader antenna. By comparison with a commercial antenna, the prototype reaches the highest volume of detection in both HM and VM modes and fulfills the targeted distance of detection.

Mots clés: LF RFID; Magnetic Coupling; Moving Tag

Domaines: Electromagnétisme

Antoine Diet, Marjorie Grzeskowiak, Marc Biancheri-Astier, Yann Le Bihan, Eric Labouré, et al.. Flexible serialized complementary coils for the detection of moving LF RFID tags. IEEE Journal of Radio Frequency Identification, 2019, 3 (3), pp.1-1. ⟨10.1109/JRFID.2019.2912532⟩. ⟨hal-02114520⟩