Device for high-frequency near-field communication and for recharging an apparatus by induction

A device for NFC high-frequency near-field communication and for the inductive charging of a portable electronic apparatus, the device comprising:

• firstly for charging, a charging surface for supporting the portable electronic apparatus and at least one charging emitter antenna arranged underneath the charging surface and emitting a magnetic field at a low frequency selected between 30 and 300 kHz, a layer of ferromagnetic material being arranged below said at least one charging antenna, and,
• secondly for communication, at least one near-field communication antenna emitting a magnetic field at a high frequency selected between 3 and 30 MHz, the device comprising a printed circuit board for monitoring and controlling charging and/or communication and at least one electric power source for said at least one charging antenna and for said at least one communication antenna,
• wherein said at least one communication antenna is in the form of at least one communication coil locally surrounding the layer of ferromagnetic material, having an axis of symmetry situated in a plane parallel to the layer of ferromagnetic material, part of the field created by said at least one communication coil passing through the layer of ferromagnetic material having a permeability comprising a real part and an imaginary part, the material of the layer of ferromagnetic material being selected so as to have a real part greater than 10 with, at the selected high frequency, a ratio between the imaginary part and the real part between 0.05 and 1 and, at the selected low frequency, a ratio between the imaginary part and the real part between 0 and 0.5.