Detection and near-field communication device
View Patent ↗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.
1. A detection and near-field communication device (D) for detecting the approach of a portable device integrating a near-field communication antenna for communicating with said portable device, the detection and near-field communication device (D) comprising:
a printed circuit ( 70 ), comprising:
an upper face (F S ), oriented toward the portable device and a lower face (F I ) oriented on the opposite side from the upper face (F S ),
a microcontroller ( 30 ),
a near-field reader ( 60 ), and
a detection module ( 50 ),
a near-field communication antenna ( 20 ), situated on a face (F S ) of the printed circuit ( 70 ) having a surface (S) and a center ( 0 ), and being linked to the near-field reader ( 60 ),
said detection and near-field communication device (D) being characterized in that it furthermore comprises:
a plurality of resonators ( 40 a , 40 b , 40 c , 40 d ) made of copper wire windings, printed on a face (F I ) of the printed circuit, covering a surface (S 1 ) substantially identical to the surface (S) of the communication antenna ( 20 ),
said resonators ( 40 a , 40 b , 40 c , 40 d ) comprising frequency adjustment means so as to resonate at the near-field communication frequency,
and said resonators ( 40 a , 40 b , 40 b , 40 c ) generating a voltage variation across their terminals (ΔVa, ΔVb, ΔVc, ΔVd) and being connected to the detection module ( 50 ) to detect the approach of the portable device.
2. The detection and near-field communication device (D) as claimed in claim 1 , characterized in that the communication antenna ( 20 ) is situated on the upper face (F S ) of the printed circuit ( 70 ) which is oriented toward the portable device and in that the plurality of resonators ( 40 a , 40 b , 40 c , 40 d ) is situated on the lower face (F I ) of the printed circuit ( 70 ).
3. The detection and near-field communication device (D) as claimed in claim 1 , characterized in that the frequency adjustment means comprise an adaptation capacitor (Ca, Cb, Cc, Cd).
4. The detection and near-field communication device (D) as claimed in claim 1 , characterized in that the frequency adjustment means consist of a number of copper wire windings.
5. The detection and near-field communication device (D) as claimed in claim 1 , characterized in that the plurality of resonators ( 40 a , 40 b , 40 c , 40 d ) is distributed in a homogeneous manner over the surface (S) of the communication antenna ( 20 ).
6. The detection and near-field communication device (D) as claimed in claim 1 , characterized in that the plurality of resonators ( 40 a , 40 b , 40 c , 40 d ) is distributed in a symmetric manner with respect to a longitudinal axis (X-X′) and with respect to a transverse axis (Y-Y′) passing through the communication antenna ( 20 ) at its center ( 0 ).
7. The detection and near-field communication device (D) as claimed in claim 1 , characterized in that it is integrated into a vehicle door handle (P).
8. An automotive vehicle comprising a detection and near-field communication device (D) as claimed in claim 1 .
9. The detection and near-field communication device (D) as claimed in claim 2 , characterized in that the frequency adjustment means comprise an adaptation capacitor (Ca, Cb, Cc, Cd).
10. The detection and near-field communication device (D) as claimed in claim 2 , characterized in that the frequency adjustment means consist of a number of copper wire windings.
11. The detection and near-field communication device (D) as claimed in claim 2 , characterized in that the plurality of resonators ( 40 a , 40 b , 40 c , 40 d ) is distributed in a homogeneous manner over the surface (S) of the communication antenna ( 20 ).
12. The detection and near-field communication device (D) as claimed in claim 2 , characterized in that the plurality of resonators ( 40 a , 40 b , 40 c , 40 d ) is distributed in a symmetric manner with respect to a longitudinal axis (X-X′) and with respect to a transverse axis (Y-Y′) passing through the communication antenna ( 20 ) at its center ( 0 ).