Electronic entity with magnetic antenna
The invention concerns an electronic entity comprising an electronic circuit and an antenna one part of which at least forms a conductive circuit connected to two ends of the electronic circuit. The projection of the circuit formed by the antenna and the electronic circuit in a plane which is substantially parallel thereto, forms an intersection-free line and the antenna includes a winding which extends over strictly more than one turn.
1. An electronic entity comprising an electronic circuit and an antenna at least a portion of which forms a conductive circuit connected to two ends of the electronic circuit,
wherein the projection of the conductive circuit formed by the antenna and the electronic circuit on a plane that is substantially parallel to the conductive circuit forms a line with no intersections and in that the antenna comprises a winding that extends over strictly more than one turn,
wherein the antenna is a magnetic antenna configured to operate by inductive coupling.
2. The electronic entity according to claim 1 , wherein the winding forms a plurality of turns.
3. The electronic entity according to claim 1 , wherein the conductive circuit includes said winding.
4. The electronic entity according to claim 1 , wherein the conductive circuit comprises a first strand and a second strand each forming a spiral, the first strand and the second strand being interlaced.
5. The electronic entity according to claim 4 , wherein the second strand is essentially parallel at each point to the first strand.
6. The electronic entity according to claim 4 , wherein the first strand and the second strand are separated by a distance of the same order of magnitude over all their length and essentially constant in each direction.
7. The electronic entity according to claim 5 , wherein the first strand and the second strand are separated by at least 8 mm.
8. The electronic entity according to claim 5 , wherein the first strand is connected to a first connecting land, wherein the second strand is connected to a second connecting land, and wherein the first strand and the second strand are connected by a connecting portion.
9. The electronic entity according to claim 8 , wherein at least one of said connecting lands is situated in a central region of the antenna.
10. The electronic entity according to claim 1 , wherein the antenna comprises a resonator coupled to the conductive circuit.
11. The electronic entity according to claim 10 , wherein the electrical conductor is formed of a single turn.
12. The electronic entity according to claim 10 , wherein the resonator is capacitively coupled to the conductive circuit.
13. The electronic entity according to claim 12 , wherein the resonator comprises a turn facing the conductive circuit over at a least a portion of its perimeter.
14. The electronic entity according to claim 13 , wherein the turn of the resonator faces the conductive circuit over virtually all its perimeter.
15. The electronic entity according to claim 13 , wherein the turn of the resonator and the conductive circuit are at a distance less than 0.5 mm over said perimeter portion.
16. The electronic entity according to claim 10 , wherein the resonator is formed of a conductive winding with free ends.
17. The electronic entity according to claim 16 , wherein the conductive circuit is inside the resonator.
18. The electronic entity according to claim 10 , wherein the resonator is inside the conductive circuit.
19. The electronic entity according to claim 10 , wherein the conductive circuit and the resonator are deposited on a same flat support.
20. The electronic entity according to claim 10 , wherein the conductive circuit is produced in a first plane, wherein the resonator is produced in a second plane different from the first plane, and wherein the resonator is in line with the conductive circuit.
21. The electronic entity according to claim 20 , wherein a median turn of the resonator is in line with the conductive circuit.
22. The electronic entity according to claim 10 , wherein the resonant frequency of the resonator alone is at most 10% higher than a communication frequency of the electronic circuit.
23. The electronic entity according to claim 10 , wherein the resonant frequency of the resonator alone is between 13.6 MHz and 17 MHz.
24. The electronic entity according to claim 1 , the electronic entity having exterior dimensions less than 100 mm.
25. The electronic entity according to claim 24 , wherein a capacitance of the electronic circuit is greater than 100 pF.
26. The electronic entity according to claim 24 , wherein said exterior dimensions are less than 30 mm.
27. The electronic entity according to claim 1 , wherein the electronic entity is a pocket electronic entity.
28. The electronic entity according to claim 1 , wherein the electronic entity is a microcircuit card.
29. The electronic entity according to claim 28 , wherein the antenna extends over about half the area of the card.
30. An electronic entity comprising:
an electronic circuit; and
an antenna at least a portion of which forms a conductive circuit connected to two ends of the electronic circuit,
wherein the projection of the conductive circuit formed by the antenna and the electronic circuit on a plane that is substantially parallel to the conductive circuit forms a line with no intersections and in that the antenna comprises a winding that extends over strictly more than one turn,
the antenna comprises a resonator coupled to the conductive circuit,
the resonator is formed of a conductive winding, and
said conductive winding comprises a plurality of turns.
31. The electronic entity according to claim 30 , wherein the turns are separated by a distance less than 0.5 mm.
32. An electronic entity comprising an electronic circuit and an antenna at least a portion of which forms a conductive circuit connected to two ends of the electronic circuit,
wherein the projection of the conductive circuit formed by the antenna and the electronic circuit on a plane that is substantially parallel to the conductive circuit forms a line with no intersections and in that the antenna comprises a winding that extends over strictly more than one turn,
wherein the electronic circuit operates at a communication frequency below 100 MHz, and
the electronic entity having exterior dimensions less than 100 mm.
33. The electronic entity according to claim 32 , wherein said communication frequency is between 1 MHz and 50 MHz.
34. The electronic entity according to claim 33 , wherein the communication frequency is between 13 MHz and 15 MHz.