| 摘要 |
The invention relates to an electronic entity having a transponder which comprises a body 11 provided with a recess and, inside said recess, a transponder comprising a mounting 12A supporting an antenna 13 formed by at least one turn running along the contour of the module and a microcircuit, said antenna and microcircuit being connected to one another, plates of conductive material 15A, 15B being formed on each of the surfaces facing one another, covering 60% to 90% of the surface defined by the one or more turns of the antenna such as to form a capacitor connected in parallel on the antenna, and the body comprising, at least approximately at said recess, an annular metal area 16 in which the inner contour which projects into the plane of the mounting surrounds said mounting and is suitable for concentrating the field lines toward the inside of the turn, the capacitor defining, with the antenna and the microcircuit, a given resonance frequency substantially equal to the frequency of an external reader. |
