Magnetic field pass through surfaces in carbon fiber reinforced polymers

Patent metadata

Field	Value
Publication number	US-9252482-B2
Application number	US-201213724582-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Oct 24, 2012
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

This document discloses one or more systems, apparatuses, methods, etc. for integrating coil antennas in a carbon fiber chassis portable device. More particularly, the carbon fiber chassis portable device containing unidirectional weave carbon fibers in its chassis—to support near field communications (NFC) related functions—is described.

First claim

What is claimed is:

1. A device comprising:
one or more processors;
a memory configured to the processors;
a near field communications (NFC) antenna configured to the processors, the NFC antenna integrated within a carbon fiber reinforced polymer (CFRP) chassis of the portable device, the CFRP chassis includes bundles of carbon fiber strands that are positioned to form a unidirectional weave.

2. The device as recited in claim 1 , wherein a plane area of the unidirectional weave in the CFRP chassis covers at least the plane area that is defined by an outermost loop of the coil antenna.

3. The device as recited in claim 1 , wherein the bundles of carbon fiber strands with the unidirectional weave are interlaced with a non-conductive material.

4. The device as recited in claim 1 , wherein the CFRP chassis includes an additional layer of twill weaved carbon fiber strands, the additional layer of twill weaved carbon fiber strands covers a plane area outside of the plane area that is defined by an outermost loop of the coil antenna.

5. The device as recited in claim 1 , wherein the NFC antenna includes a continuous loop of coil antenna, a direction of the loop of the coil antenna follows the direction of the formed unidirectional weave.

6. The device as recited in claim 1 , wherein a direction of the formed unidirectional weave in the CFRP chassis is configured to be perpendicular to an assumed direction of Eddy currents that are induced by the NFC antenna to the CFRP chassis.

7. The device as recited in claim 1 , wherein the CFRP chassis is grounded to suppress electrostatic discharge (ESD).

8. The portable device as recited in claim 1 , wherein the coil antenna is made out of one of: a printed circuit board (PCB), a flexible printed circuit (FPC), a metal wire, created through a laser direct structuring (LDS) process, or directly embedded to the metal chassis and within the conductive coating.

9. A near field communications (NFC) antenna comprising:
a continuous loop of coil antenna that is integrated within a carbon fiber reinforced polymer (CFRP) chassis of a portable device, the CFRP chassis includes carbon fiber strands in a single direction to cover the coil antenna; and
an NFC module to provide tuning to the coil antenna.

10. The NFC antenna as recited in claim 9 , wherein a plane area of the carbon fiber strands covers at least the plane area that is defined by the coil antenna.

11. The NFC antenna as recited in claim 9 , wherein the carbon fiber strands in the single direction are interlaced with a non-conductive material.

12. The NFC antenna as recited in claim 9 , wherein the CFRP chassis includes an additional layer of twill weaved carbon fiber strands, the additional layer of twill weaved carbon fiber strands covers a plane area that is outside of the plane area defined by the coil antenna.

13. The NFC antenna as recited in claim 9 , wherein a direction of the loop of the coil antenna is parallel to the direction of the carbon fiber strands that are unidirectional in weave.

14. The NFC antenna as recited in claim 9 , wherein the single direction of the CFRP chassis is configured to be perpendicular to an assumed direction of Eddy currents that are induced by the coil antenna to the CFRP chassis.

15. The NFC antenna as recited in claim 9 , wherein the coil antenna is made out of one of a printed circuit board (PCB), a flexible printed circuit (FPC), a metal wire, created through a laser direct structuring (LDS) process, or directly embedded to the metal chassis and within the conductive coating.

16. A method of integrating a near field communications (NFC) antenna to a carbon fiber reinforced polymer (CFRP) chassis portable device, the method comprising:
weaving bundles of carbon fiber in a unidirectional and parallel configuration, wherein the bundles of carbon fiber are interlaced with non-conductive materials;
positioning the weaved bundles of carbon fiber to a direction of a loop of the NFC antenna;
radiating electromagnetic fields by the NFC antenna;
inducing a current to the weaved bundles of carbon fiber by the radiated electromagnetic fields; and
providing high impedance to the induced current.

17. The method as recited in claim 16 , wherein the CFRP chassis portable device includes an additional layer of twill weaved carbon fiber, the additional layer of twill weaved carbon fiber covers a plane area that is outside of the plane area defined by the NFC antenna.

18. The method as recited in claim 16 , wherein the bundles of carbon fiber in the unidirectional and parallel configuration cover at least a plane area that is defined by the NFC antenna.

19. The method as recited in claim 16 , wherein the unidirectional and parallel configuration is perpendicular to an assumed direction of Eddy currents that are induced by the NFC antenna to the CFRP chassis portable device.

20. The method as recited in claim 16 , wherein the coil antenna is made out of one of a printed circuit board (PCB), a flexible printed circuit (FPC), a metal wire, created through a laser direct structuring (LDS) process, or directly embedded to the metal chassis and underneath the conductive coating.

Assignees

• Intel Corp

Inventors

• Konanur Anand S
• Karacaoglu Ulun

Classifications

• H04B5/26

  using coils · CPC title

• H01Q7/00

  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 title

• Y10T29/49016

  Antenna or wave energy "plumbing" making · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01P11/00

  Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type · CPC title