TRANSMITTING MAGNETIC FIELD THROUGH METAL CHASSIS USING FRACTAL SURFACES

• US 20170005704A1
• Filed: 09/13/2016
• Published: 01/05/2017
• Est. Priority Date: 07/03/2012
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Konanur, Anand S., Karacaoglu, Ulun, Yang, Songnan
• Granted Patent: US 9,853,695 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 1/52 Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure absorbing means H01Q17/00
• CPC Class Codes: H01Q 1/528 reducing the re-radiation of a support structure in a parabolic reflector antenna H01Q19/023
• 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: H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems
• CPC Class Codes: H04B 5/26 using coils

Abstract

Described herein are techniques related one or more systems, apparatuses, methods, etc. for reducing induced currents in a apparatus chassis. For example, a fractal slot is constructed in the apparatus chassis to reduce the induced currents, and enhance passage of magnetic fields through the apparatus chassis. In this example, the fractal slot may include a no-self loop fractal space filling curve shape to provide high impedance to the induced currents.

Claims

1. A portable electronic device comprising:

a near field coil (NFC) antenna; and

a conductive layer is placed near an external surface of the portable electronic device, wherein the NFC antenna is integrated adjacent to the conductive layer; and

a plurality of apertures constructed on the conductive layer to cover an area defined at least by a radial pattern of the NFC antenna, wherein the plurality of apertures are coplanar to the NFC antenna.

2. The portable electronic device of claim 1, wherein the NFC is an antenna.

3. The portable electronic device of claim 1, wherein the external surface is a cover of the portable electronic device.

4. The portable electronic device of claim 1, wherein the external surface is a metallic chassis of the portable electronic device.

5. The portable electronic device of claim 1, wherein the conductive layer is located between a metal chassis of the portable electronic device and the NFC coil.

6. The portable electronic device of claim 1, wherein the plurality of perforation apertures are fractal slots.

7. The portable electronic device of claim 1, wherein the plurality of perforation apertures are tiled to one another.

8. The portable electronic device of claim 1, wherein the plurality of perforation apertures are fractal slots tiled to one another, and comprises a no-self loop fractal space filling curve template.

9. A portable device chassis comprising:

a near field communications (NFC) coil integrated underneath the apparatus chassis;

a conductive layer, wherein the NFC coil is positioned coplanar to the conductive layer of portable electronic device; and

a plurality of perforation apertures constructed on the conductive layer to cover an area defined by the NFC coil.

10. The portable device chassis of claim 9, wherein the NFC coil is an antenna used for near field communications.

11. The portable device chassis of claim 9, wherein the conductive layer is part of a cover of the portable device.

12. The portable device chassis of claim 9, wherein the portable device chassis is metallic.

13. The portable device chassis of claim 9, wherein the conductive layer is part of a cover of the portable device.

14. The portable device chassis of claim 9, wherein the plurality of perforation apertures are fractal slots.

15. The portable device chassis of claim 9, wherein the plurality of perforation apertures are tiled to one another.

16. The portable device chassis of claim 9, wherein the plurality of perforation apertures are fractal slots tiled to one another, and comprise a no-self loop fractal space filling curve template.

17. A method of reducing induced currents in an apparatus chassis comprising:

providing a plurality of apertures that provide for radiation from a near field communications (NFC) coil; and

radiating an electromagnetic field by the NFC antenna.

18. The method of claim 17 wherein the plurality of apertures are fractal slots.

19. The method of claim 17 wherein the plurality of apertures are tiled to one another.

20. The method of claim 17 wherein the plurality of apertures cover a periphery of the NFC coil.