Approach detection device

A device for detecting an approach of a part of a user's body and/or of a portable user equipment, intended to be housed on board a motor vehicle, comprising:

• a) a near-field communication (NFC) antenna configured to transmit and receive signals at a high resonant frequency selected between 3 and 30 MHz, said NFC antenna comprising at least one winding that extends continuously in the form of a set of rods such that said rods have a variable capacitance connected to said NFC antenna and that said NFC antenna is able to generate a variation in capacitance in response to the approach of a part of a user's body;
• and
• b) measuring means for measuring, through electromagnetic coupling with said NFC antenna, a variation in impedance or a variation in frequency of said NFC antenna, the measuring means having a series resonant frequency at the selected high resonant frequency and being able to detect the approach of a portable user equipment or the approach of a part of the user's body, wherein the winding defines a perimeter within which said NFC antenna extends continuously in the form of a set of comb-shaped rods.