Omnidirectional flat antenna and method of production

• US 20100220025A1
• Filed: 09/22/2006
• Published: 09/02/2010
• Est. Priority Date: 09/22/2005
• Status: Active Grant

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Savry, Olivier
• Granted Patent: US 8,106,845 B2
• Time in Patent Office: Days
• US Class Current: 343/788
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07783 the coil being planar
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles

Abstract

The inventive antenna comprises a planar substrate carrying as first winding whose axis is arranged in a parallel position to the plane of the substrate. Said antenna also comprises at least one second winding, whose axis is arranged in a parallel position to the plane of the substrate and which is wound-up about a thin layer made of high magnetically permeable material and arranged in a parallel position with respect to the plane of the substrate. A third winding, whose axis is perpendicular to the first and second windings and which is wound-up about an additional thin layer can be provided. Said additional thin layer is arranged in a parallel position to the plane of the substrate and is made of high magnetically permeable material.

Claims

1-10. -10. (canceled)

11. A flat antenna comprising a first flat coil formed on a surface of a flat substrate, the first coil having an axis perpendicular to the plane of the substrate, the antenna comprising a second coil having an axis parallel to the plane of the substrate, wherein the second coil is wound around a magnetic thin layer deposited on said surface of the substrate.

12. The antenna according to claim 11, wherein said thin layer comprises a high magnetic permeability material, with a relative permeability of more than 500.

13. The antenna according to claim 11, comprising a third coil having an axis perpendicular to the axes of the first and second coils, and wound around an additional magnetic thin layer parallel to the plane of the substrate.

14. The antenna according to claim 13, wherein said additional thin layer comprises a high magnetic permeability material with a relative permeability of more than 500.

15. The antenna according to claim 13, wherein an electrically insulating layer is arranged between the second and third coils.

16. The antenna according to claim 13, wherein the second and third coils extend along the axes of symmetry of the first coil.

17. The antenna according to claim 12, wherein said high magnetic permeability material comprises an axis of greatest magnetic susceptibility parallel to the axis of the second coil.

18. The antenna according to claim 14, wherein said high magnetic permeability material of said additional thin layer comprises an axis of greatest magnetic susceptibility parallel to the axis of the third coil.

19. The antenna according to claim 13, wherein each of the second and third coils covers a much smaller surface, in a plane parallel to the plane of the substrate, than the surface delineated by the first coil.

20. A method of production of an antenna according to claim 11, comprising:

deposition on the substrate of metallized tracks forming the first coil,

deposition of bottom metallized tracks of the second coil,

deposition, parallel to the plane of the substrate, of the thin layer of high magnetic permeability material,

formation, on said thin layer and at the periphery thereof, respectively of top metallized tracks of the second coil and of lateral metallized tracks connecting the top and bottom metallized tracks of the second coil.

21. The method of production according to claim 20, further comprising:

deposition of an electrically insulating layer covering the thin layer and the second coil,

deposition on the electrically insulating layer of bottom metallized tracks of a third coil,

deposition, parallel to the plane of the substrate, of an additional thin layer of high magnetic permeability material,

formation, on said additional thin layer and at the periphery thereof, respectively of top metallized tracks of the third coil and of lateral metallized tracks connecting the top and bottom metallized tracks of the third coil.