Device for activating a vehicle function in the near field and in the ultra-wide band

A device for activating a vehicle function in the near field and in the ultra-wide band, intended to be installed on board a motor vehicle, the device comprising:

• a) an antenna consisting of a plurality of discontinuous windings having two junction zones thus forming a first antenna part and a second antenna part,
• b) near-field communication control means of said antenna which are electrically connected to said antenna,
• c) first connection means between the windings of the two antenna parts the junction zones comprising at least one inductor, the at least one inductor connecting a winding of the first part to a corresponding winding of the second part,
• d) the near-field communication control means of said antenna and the first connection means and the two antenna parts forming a near-field communication antenna,
• e) ultra-wide band communication control means of said antenna which are electrically connected to said antenna at a junction point,
• f) second connection means between the windings of one and the same antenna part, comprising at least one capacitor of capacitance, the at least one capacitor connecting together two windings of the same first antenna part or of the same second antenna part,
• g) the control means of said ultra-wide band antenna, the connection means and the two antenna parts forming an ultra-wide band dipole antenna,
• the activation device being able to communicate in the near field and in the ultra-wide band simultaneously.