Electronic entity having a magnetic antenna
View Patent ↗An electronic entity includes an electronic circuit ( 21 ) having at least one first terminal ( 22 ) and a second terminal ( 24 ) to which an antenna is connected. The antenna includes a conducting element ( 26 ) electrically connected to the first terminal ( 22 ) of the electronic circuit ( 21 ) and includes a resonator ( 28 ) insulated from the conducting element ( 26 ) at the antenna, electrically connected to the second terminal ( 24 ) of the electronic circuit ( 21 ) and coupled to the conducting element ( 26 ).
1. An electronic entity comprising:
an electronic circuit having at least a first terminal and a second terminal to which a magnetic antenna is connected,
wherein the antenna comprises a conductive member ( 6 ; 16 ; 26 ; 36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ; 18 ; 28 ; 38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ; 16 ; 26 ; 36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ).
2. The electronic entity according to claim 1 , wherein the resonator ( 8 ; 18 ; 28 ; 38 ) is capacitively coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ).
3. The electronic entity according to claim 2 , wherein the capacitance of the conductive member is negligible compared to the coupling capacitance (C c ).
4. The electronic entity according to claim 2 , wherein the resonator ( 8 ; 18 ; 28 ) comprises a turn facing the conductive member ( 6 ; 16 ; 26 ) over at least a portion of its perimeter.
5. The electronic entity according to claim 4 , wherein the turn faces the conductive member ( 6 ; 16 ; 26 ) over virtually all of its perimeter.
6. The electronic entity according to claim 4 , wherein the turn and the conductive member ( 6 ; 16 ; 26 ) are situated at a distance less than 0.5 mm over said perimeter portion.
7. The electronic entity according to claim 1 , wherein the conductive member is formed by a turn portion.
8. The electronic entity according to claim 1 , wherein the capacitance of the conductive member is negligible compared to the capacitance (C R ) of the resonator.
9. The electronic entity according to claim 1 , wherein the inductance of the conductive member is negligible compared to the inductance (L R ) of the resonator.
10. The electronic entity according to claim 1 , wherein the resonator ( 8 ; 18 ; 28 ; 38 ) takes the form of a conductive winding having at least one free end.
11. The electronic entity according to claim 10 , wherein the resonator ( 28 ; 38 ) is connected to the second terminal by the end of the winding opposite the free end.
12. The electronic entity according to claim 10 , wherein said conductive winding comprises a plurality of turns.
13. The electronic entity according to claim 12 , wherein the turns are separated two by two by a distance less than 0.5 mm.
14. The electronic entity according to claim 10 , wherein the conductive member is inside the area defined by the resonator.
15. The electronic entity according to claim 1 , wherein the conductive member ( 6 ; 16 ; 26 ; 36 ) and the resonator ( 8 ; 18 ; 28 ; 38 ) are deposited on a common plane support.
16. The electronic entity according to claim 1 , wherein the resonant frequency of the resonator alone is not more than 10% greater than a communication frequency of the electronic circuit.
17. The electronic entity according to claim 1 , wherein the electronic circuit operates at a communication frequency below 100 MHz.
18. The electronic entity according to claim 17 , wherein said communication frequency is from 1 MHz to 50 MHz.
19. The electronic entity according to claim 18 , wherein the communication frequency is from 13 MHz to 15 MHz.
20. The electronic entity according to claim 19 , wherein the resonant frequency of the resonator alone is from 13.6 MHz to 17 MHz.
21. The electronic entity according to claim 1 , having overall exterior dimensions less than 100 mm.
22. The electronic entity according to claim 21 , wherein the resonator ( 8 ; 18 ) comprises more than ten turns.
23. The electronic entity according to claim 21 , wherein said exterior dimensions are less than 30 mm.
24. A pocket electronic entity according to claim 1 .
25. The electronic entity according to claim 1 , forming a microcircuit card.
26. The electronic entity according to claim 25 , wherein the antenna extends over about half the area of the card.
27. The electronic entity according to claim 1 , wherein the end of the conductive member ( 6 ; 26 ; 36 ) opposite the first terminal of the electronic circuit is free.
28. The electronic entity according to claim 1 , constituting an electronic identity document.
29. An electronic entity comprising:
an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected,
wherein the antenna comprises a conductive member ( 6 ; 16 ; 26 ; 36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ; 18 ; 28 ; 38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ; 16 ; 26 ; 36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ), and the resonator ( 8 ; 18 ; 28 ; 38 ) takes the form of a conductive winding having two free ends.
30. The electronic entity according to claim 29 , wherein said conductive winding comprises a plurality of turns.
31. The electronic entity according to claim 30 , wherein the turns are separated two by two by a distance less than 0.5 mm.
32. The electronic entity according to claim 29 , wherein the conductive member is inside the area defined by the resonator.
33. An electronic entity comprising:
an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected,
wherein the antenna comprises a conductive member ( 6 ; 16 ; 26 ; 36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ; 18 ; 28 ; 38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ; 16 ; 26 ; 36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ), and the resonator ( 8 ; 18 ; 28 ; 38 ) is inside the conductive member ( 6 ; 16 ; 26 ; 36 ).
34. An electronic entity comprising:
an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected,
wherein the antenna comprises a conductive member ( 6 ; 16 ; 26 ; 36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ; 18 ; 28 ; 38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ; 16 ; 26 ; 36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ), and
the projection of the circuit formed by the antenna and the electronic circuit in a plane that is substantially parallel to that projection forms a line with no intersections and wherein the antenna comprises a winding ( 8 ; 18 ; 28 ; 38 ) that extends over strictly more than one turn.
35. An electronic entity comprising:
an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected,
wherein the antenna comprises a conductive member ( 6 ; 16 ; 26 ; 36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ; 18 ; 28 ; 38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ; 16 ; 26 ; 36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ), and
the conductive member is produced in a first plane, the resonator is produced in a second plane different from the first plane, and the resonator is in line with the conductive member.
36. The electronic entity according to claim 35 , wherein a median turn of the resonator is in line with the conductive member.
37. An electronic entity comprising:
an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected,
wherein the antenna comprises a conductive member ( 6 ; 16 ; 26 ; 36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ; 18 ; 28 ; 38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ; 16 ; 26 ; 36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ; 16 ; 26 ; 36 ), and the conductive member ( 16 ) forms a loop connected at both ends to the first terminal of the electronic circuit.