System and method for multiple antennas having a single core

• US 7,123,206 B2
• Filed: 10/24/2003
• Issued: 10/17/2006
• Est. Priority Date: 10/24/2003
• Status: Expired due to Fees

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Morgan, Wayne A., Hess, Philip B.
• Primary Examiner(s): Chen, Shih-Chao
• Assistant Examiner(s): A, MINH D
• Application Number:
  US10/692,541
• Publication Number:
  US 20050088357A1
• Time in Patent Office: 1,089 Days
• Field of Search: 343/741, 343/742, 343/743, 343/788, 343/867, 343/895
• US Class Current: 343/788
• CPC Class Codes: A61N 1/37223 Circuits for electromagnetic coupling
• CPC Class Codes: A61N 1/37229 Shape or location of the implanted or external antenna
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A system and method for multiple antennas on a single core. The system may include a first core, a first winding wound about the first core for transmitting/receiving electromagnetic signals, and a second winding for transmitting/receiving electromagnetic signals wound about the first core and the first winding. The first winding and the second winding may be wound such that a direction of a first magnetic field generated by the first winding is different than a direction of a second magnetic field generated by the second winding. The system may also include activation circuitry connected to the first winding and the second winding. The activation circuitry may activate the first winding separately from the second winding. The system may be expanded to three or more coils/antennas disposed on a single core.

Claims

1. An antenna system comprising:

a first core;

a first winding disposed about the first core for transmitting/receiving electromagnetic signals;

a second winding for transmitting/receiving electromagnetic signals disposed about the first core and the first winding; and

activation circuitry connected to the first winding and the second winding,

wherein the first winding and the second winding are wound such that a direction of a first magnetic field generated by the first winding is different than a direction of a second magnetic field generated by the second winding, and

wherein the activation circuitry activates the first winding separately from the second winding.

2. The system of claim 1, wherein the first core is air.

3. The system of claim 1, wherein the first core is a ferrite.

4. The system of claim 1, wherein the first winding is wound as a helical solenoid around the first core.

5. The system of claim 1, wherein the first winding is wound as a rectangular solenoid around the first core.

6. The system of claim 1, wherein the second winding is wound as a helical solenoid around the first core.

7. The system of claim 1, wherein the second winding is wound as a rectangular solenoid around the first core.

8. The system of claim 1, further comprising a third winding, wherein the third winding is disposed about the first core, the first winding and the second winding, and

wherein the third winding is wound such that a direction of a third magnetic field generated by the third winding is different than the direction of the first magnetic field and the second magnetic field.

9. The system of claim 8, wherein the activation circuitry comprises a multiplexer for facilitating separate activation of the third winding.

10. The system of claim 8, wherein the third winding transmits a radio frequency signal.

11. The system of claim 8, wherein the third winding receives a radio frequency signal.

12. The system of claim 8, wherein the direction of the third magnetic field is orthogonal to the direction of the first magnetic field and the second magnetic field.

13. The system of claim 8, wherein the third winding is optimized for high permeability.

14. The system of claim 8, wherein the third winding is shielded.

15. The system of claim 1, wherein the third winding is wound as a helical solenoid around the first core.

16. The system of claim 1, wherein the third winding is wound as a rectangular solenoid around the first core.

17. The system of claim 1, wherein the activation circuitry comprises a multiplexer for facilitating separate activation of the first winding and the second winding.

18. The system of claim 1, wherein the first winding and the second winding transmit a radio frequency signal.

19. The system of claim 1, wherein the first winding and the second winding receive a radio frequency signal.

20. The system of claim 1, wherein the direction of the first magnetic field is orthogonal to the direction of the second magnetic field.

21. The system of claim 1, wherein at least one of the first winding and the second winding is shielded.

22. The system of claim 1, wherein the first winding and the second winding are balanced.

23. The system of claim 1,

wherein the first winding generates the first magnetic field in response to a data signal;

and

wherein the second winding generates the second magnetic field in response to the same data signal.

24. The system of claim 23, wherein the data signal is sent to the first winding and to the second winding simultaneously.

25. The system of claim 23, wherein the data signal is sent to the first winding at a first time and to the second winding at a second time different from the first time.

26. The system of claim 1,

wherein the first winding receives a magnetic field relating to information transmitted by a single source;

and

wherein the second winding receives the magnetic field relating to the same information transmitted by the single source.

27. The system of claim 26, wherein the activation circuitry activates only one of the first winding and the second winding at a time to receive the magnetic field.

28. The system of claim 26,

wherein the activation circuitry activates both the first winding and the second winding to receive the magnetic field;

wherein the system further includes a processor for processing signals corresponding to the received magnetic fields; and

wherein a stronger of the received magnetic field at the first winding and the received magnetic field at the second winding is chosen for processing.

29. The system of claim 1, wherein the first core is disposed on an implantable unit configured for implantation in a body of a medical patient.

31. The system of claim 1, wherein the first winding is optimized for high permeability.

32. The system of claim 1, wherein the second winding is optimized for high permeability.

30. An antenna system comprising:

a first core;

a first winding disposed about the first core for transmitting/receiving electromagnetic signals;

a second winding for transmitting/receiving electromagnetic signals disposed about the first core and the first winding;

activation circuitry connected to the first winding and the second winding;

a second core;

a further winding disposed about the second core for transmitting/receiving electromagnetic signals; and

a yet further winding for transmitting/receiving electromagnetic signals disposed about the second core and the further winding,

wherein the first winding and the second winding are wound such that a direction of a first magnetic field generated by the first winding is different than a direction of a second magnetic field generated by the second winding,

wherein the activation circuitry activates the first winding separately from the second winding, and

wherein the yet further winding is serially connected to the second winding.

33. The system of claim 30, wherein at least one of the further winding and the yet further winding is optimized for high permeability.

34. An inductively coupled system comprising:

a first core disposed on an implantable unit;

a local first winding disposed about the first core for transmitting/receiving RF signals;

at least one local second winding for transmitting/receiving electromagnetic signals disposed about the first core and the local first winding;

a second core disposed on a remote unit;

a remote first winding disposed about the second core for transmitting/receiving RF signals; and

at least one remote second winding for transmitting/receiving electromagnetic signals disposed about the second core and the remote first winding,

wherein magnetic fields are coupled between the local first winding and the at least one local second winding on the first core and the remote first winding and the at least one remote second winding on the second core.

35. The system of claim 34, wherein the at least one local second winding comprises one winding.

36. The system of claim 34, wherein the at least one local second winding comprises two windings.

37. The system of claim 34, wherein the at least one remote second winding comprises one winding.

38. The system of claim 34, wherein the at least one remote second winding comprises two windings.

39. The system of claim 34, wherein the implantable unit is disposed internally in a body.

40. The system of claim 34, wherein the remote unit is disposed externally to a body.

41. The system of claim 34, wherein the remote unit is disposed internally to a body.

42. A method for implementing an antenna system comprising:

providing a core;

winding a first coil for transmitting/receiving electromagnetic signals about the core;

winding a second coil for transmitting/receiving electromagnetic signals about the first core and the first winding; and

activating the first coil separately from the second coil;

wherein the first coil receives a magnetic field relating to information transmitted by a single source;

wherein the second coil receives the magnetic field relating to the same information transmitted by the single source;

wherein the activation circuitry activates both the first coil and the second coil to receive the magnetic field;

wherein the method further includes processing signals corresponding to the received magnetic fields; and

wherein a stronger of the received magnetic field at the first coil and the received magnetic field at the second coil is chosen for processing.

43. The method of claim 42, wherein the core provided is an air core.

44. The method of claim 42, wherein the core provided is a ferrite core.

45. The method of claim 42, wherein the first coil is wound as a helical solenoid around the core.

46. The method of claim 42, wherein the first coil is wound as a rectangular solenoid around the core.

47. The method of claim 42, wherein the second coil is wound as a helical solenoid around the core.

48. The method of claim 42, wherein the second coil is wound as a rectangular solenoid around the core.

49. The method of claim 42, further comprising winding a third coil for transmitting/receiving electromagnetic signals about the core, the first winding and the second winding.

50. The method of claim 49, wherein the first coil, the second coil and the third coil are wound orthogonal to each other.

51. The method of claim 42, wherein the third coil is wound as a helical solenoid around the core.

52. The method of claim 42, wherein the third coil is wound as a rectangular solenoid around the core.

53. The method of claim 42, wherein the first coil and the second coil are wound orthogonal to each other.

54. The method of claim 42, wherein the activation circuitry activates only one of the first coil and the second coil at a time to receive the magnetic field.

55. The method of claim 42, further comprising disposing the core on an implantable unit configured for implantation in a body of a medical patient.