Coil and ferrite configuration to facilitate near field coupling

• US 9,722,460 B2
• Filed: 12/21/2011
• Issued: 08/01/2017
• Est. Priority Date: 12/21/2011
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Walsh, Jim J., Cooper, Emily B., Yang, Songnan, Konanur, Anand S.
• Primary Examiner(s): Levi, Dameon E
• Assistant Examiner(s): Lotter, David
• Application Number:
  US13/976,067
• Publication Number:
  US 20150236550A1
• Time in Patent Office: 2,050 Days
• Field of Search: 343702, 455 411, 455 412
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Described herein are techniques related to near field coupling (e.g., wireless power transfers (WPF) and near field communications (NFC)) operations among others. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Claims

1. A portable device comprising:

a housing having at least one metallic component positioned within the housing, the at least one metallic component defining at least two surfaces;

a coil defining a generally planar coil portion which is positioned in the housing and proximate to the metallic component and being configured to couple with magnetic flux from a field, at least one surface of the metallic component being out of plane with the coil; and

a flux guide that includes a planar portion and two shield portions to form a letter “

U”

shape, the planar portion of the flux guide positioned between the metallic component and the generally planar coil portion, the two shield portions of the flux guide being wrapped around out of plane edge-surfaces of the metallic component to facilitate coupling the flux between the coil and the field.

2. A portable device as recited in claim 1, wherein the housing defines a side and wherein the portable device is configured to be positioned side-by-side with another device to perform near field coupling there between.

3. A portable device as recited in claim 1, wherein the coil is configured to receive flux from a field of a transmission coil.

4. A portable device as recited in claim 1, wherein the coil is configured to generate a field for coupling flux to a reception coil.

5. A portable device as recited in claim 1, wherein the flux guide is continuous.

6. A portable device as recited in claim 1, wherein the flux guide comprises ferrite material.

7. A portable device as recited in claim 1, wherein the coil is configured to resonate near a frequency selected from the group consisting of 6.78 MHz and 13.56 MHz.

8. A portable device as recited in claim 1, wherein the out of plane surface of the metallic component includes a surface that is not covered by the letter “

U”

-shaped flux guide.

9. A portable device as recited in claim 1, wherein the portable device is selected from a group consisting of a mobile phone, a cellular phone, a smartphone, a personal digital assistant, a tablet computer, a netbook, a notebook computer, a laptop computer, a multimedia playback device, a digital music player, a digital video player, a navigational device, and a digital camera.

10. A device comprising:

a housing having at least one metallic component positioned within the housing, the metallic component defining at least a first surface, a second surface, and two edge-surfaces;

a coil defining a plane and a generally planar coil portion in parallel with the plane and which is positioned in the housing and proximate to the metallic component; and

a flux guide that includes a generally planar portion and two shield portions to form a letter “

U”

shape, the generally planar portion of the flux guide is positioned between the generally planar coil portion and the first surface of the metallic component, the two shield portions of the flux guide being wrapped around the two edge-surfaces of the metallic components.

11. A device as recited in claim 10, wherein the housing defines a side and wherein the device is configured to be positioned side-by-side with another device to perform near field coupling operation.

12. A device as recited in claim 11, wherein the near field coupling operation selected from the group consisting of wireless power transfer (WPT), near field communication (NFC), and a combination thereof.

13. A device as recited in claim 10, wherein the coil is configured to receive flux from a field of a transmission coil.

14. A device as recited in claim 10, wherein the coil is configured to generate a field for coupling flux to a reception coil.

15. A device as recited in claim 10, wherein the flux guide is continuous.

16. A device as recited in claim 10, wherein the flux guide is made of ferrite.

17. A device as recited in claim 10, wherein the coil is configured to resonate near a frequency selected from the group consisting of 6.78 MHz and 13.56 MHz.

18. A device as recited in claim 10, wherein the second surface of the metallic component is not covered by the letter “

U”

-shaped flux guide.

19. A device as recited in claim 10, wherein the device is selected from a group consisting of a mobile phone, a cellular phone, a smartphone, a personal digital assistant, a tablet computer, a netbook, a notebook computer, a laptop computer, a multimedia playback device, a digital music player, a digital video player, a navigational device, and a digital camera.

20. A portable device comprising:

a housing defining a side wherein the portable device is configured to be positioned side-by-side to perform a near field coupling-related function with another device positioned proximate to the side, the housing having at least one metallic component positioned within the housing, the at least one metallic component defining first and second surfaces, a generally planar coil defining a plane and being positioned in the housing and proximate to the metallic component, wherein the coil is configured to receive flux from a fringing field of a transmission coil and wherein the second surface of the metallic component projects away from the plane of the coil; and

a continuous flux guide made of ferrite and defining a generally planar flux guide portion with extended shield portion at each end of the generally planar flux guide portion, wherein the generally planar flux guide portion is positioned between the generally planar coil and the first surface of the metallic-component, wherein each of the extended shield portion of the flux guide being wrapped around out of plane edge-surfaces of the metallic component.

21. A device as recited in claim 20, wherein the near field coupling-related function is selected from the group consisting of a wireless power transfer (WPT), a near field communication (NFC) function, and a combination thereof.

22. A device as recited in claim 20, further comprising a processor and memory in the housing.