SHIELDING LAYER FOR A DEVICE HAVING A PLURALITY OF ANTENNAS

• US 20140320369A1
• Filed: 06/06/2013
• Published: 10/30/2014
• Est. Priority Date: 04/24/2013
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Walley, John, Azenui, Ntsanderh (Christian)
• Application Number:
  US13/911,174
• Publication Number:
  US 20140320369A1
• Time in Patent Office: Days
• US Class Current: 343/841
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• 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: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A shielding layer is provided that reduces the coupling between magnetic field lines emanating from a plurality of antennas in an electronic device. In one embodiment, the shielding layer is a heterogeneous shielding layer that has different regions. Each region is configured to be positioned adjacent to a respective antenna. Each region is a different type of material, has a different thickness, and/or has other non-uniformities (e.g., different permeabilities) to concentrate magnetic field lines in accordance to the properties of the respective antenna. In another embodiment, a heterogeneous shielding layer is provided that has different regions that are formed of a same material that is configured to concentrate magnetic field lines. Each region is configured to be positioned adjacent to a respective antenna. The different regions are separated by gap to isolate the magnetic field lines emanating from the respective antenna, which reduces the coupling between the magnetic field lines.

Claims

1. An apparatus, comprising:

a shielding layer formed of at least one material configured to concentrate magnetic field lines,

wherein the shielding layer includes a first region that has a first characteristic and a second region that has a second characteristic that is different from the first characteristic, and

wherein the first region is configured to be positioned adjacent to at least a first antenna and the second region is configured to be positioned adjacent to at least a second antenna.

2. The apparatus of claim 1, wherein the first characteristic of the first region is a first permeability and the second characteristic of the second region is a second permeability, the first permeability being different from the second permeability.

3. The apparatus of claim 1, wherein the first characteristic of the first region is a first thickness and the second characteristic of the second region is a second thickness, the first thickness being different from the first thickness.

4. The apparatus of claim 1, further comprising:

a gap that separates the first region from the second region.

5. The apparatus of claim 1, wherein the second region rings the first region.

6. The apparatus of claim 1, wherein the first antenna is a near field communication (NFC) antenna and the second antenna is a wireless power transfer (WPT) antenna.

7. The apparatus of claim 1, wherein the at least one material comprises a ferrite material.

8. The apparatus of claim 1, wherein the shielding layer is formed of at least two materials that are each configured to concentrate magnetic field lines, wherein the first region comprises a first material of the at least two materials and the second region comprises a second material of the at least two materials, the first material being different from the second material.

9. The apparatus of claim 8, wherein the first material comprises a first ferrite material and the second material comprises a second ferrite material, the first ferrite material being different from the second ferrite material.

10. An apparatus, comprising:

a shielding layer having at least two regions separated by a gap,

wherein the at least two regions are formed of a same material,

wherein each of the at least two regions are configured to concentrate magnetic field lines, and

wherein the shielding layer is configured to be positioned adjacent to a plurality of antennas.

11. The apparatus of claim 10, wherein the same material comprises a ferrite material.

12. The apparatus of claim 10, wherein a first region of the at least two regions has a first thickness and a second region of the at least two regions has a second thickness, the first thickness being different from the second thickness.

13. The apparatus of claim 10, wherein a first region of the at least two regions rings a second region of the at least two regions.

14. The apparatus of claim 10, wherein a first antenna of the plurality of antennas is a near field communication (NFC) antenna and a second antenna of the plurality of antennas is a wireless power transfer (WPT) antenna.

15. A method for forming a shielding layer, comprising:

forming a first region of the shielding layer that covers a first portion of a substrate, the first region having a first characteristic; and

forming a second region of the shielding layer having a second characteristic that covers a second portion of the substrate, the first portion being different than the second portion.

16. The method of claim 15, further comprising:

forming a gap that separates the first region from the second region.

17. The method of claim 15, wherein a first region rings the second region.

18. The method of claim 15, wherein the first characteristic of the first region is a first permeability value and the second characteristic of the second region is a second permeability value, the first permeability value being different from the second permeability value.

19. The method of claim 15, wherein the first characteristic of the first region is a first thickness and the second characteristic of the second region is a second thickness, the first thickness being different from the first thickness.

20. The method of claim 15, wherein the first region and the second region comprise a ferrite material.