A detection and near-field communication device for detecting the approach of a portable device integrating a near-field communication antenna for communicating with the portable device, includes:
a printed circuit including: an upper face oriented toward the portable device and a lower face, a microcontroller, a near-field reader, a detection module, a near-field communication antenna, situated on a face of the printed circuit having a first surface and being linked to the near-field reader;
a plurality of resonators made of copper wire windings, printed on a face of the printed circuit, covering a surface substantially identical to the first surface;
the resonators including frequency adjustment elements so as to resonate at the near-field communication frequency; and
the resonators generating a voltage variation across their terminals and being connected to the detection module to detect the approach of the portable device.