Spiral near field communication (NFC) coil for consistent coupling with different tags and devices

Patent metadata

Field	Value
Publication number	US-9934895-B2
Application number	US-201213538292-A
Country	US
Kind code	B2
Filing date	Jun 29, 2012
Priority date	Jun 29, 2012
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

This document discloses one or more systems, apparatuses, methods, etc. for integrating a spiral near field communications (NFC) coil antenna to a portable device for consistent coupling with different tags and devices.

First claim

What is claimed is:

1. A portable device comprising:
one or more processors;
a memory configured to the processors;
a spiral shaped near field communications (NFC) coil antenna configured to the processors wherein the spiral shaped NFC coil antenna includes a first loop, a second loop tied to the first loop, and a third loop tied to the second loop, wherein the first loop, the second loop, and the third loop are progressively larger in size based upon a substantial amount of mutual inductances obtained with reference to a first, a second, and a third reference listening devices, respectively, wherein the first loop, the second loop and the third loop are disposed on a single plane, and wherein the first, the second, and the third reference listening devices have progressively larger sized antenna loop areas.

2. The portable device as recited in claim 1 , wherein the first, the second, and the third reference listening devices are NFC Forum—reference listening devices that include coil antenna designs used in credit cards, tags, or devices.

3. The portable device as recited in claim 1 , wherein the first, the second, and the third reference listening devices include a sense coil with at least one or more number of turns that are grouped together without regard to spaces between each loop in the turns.

4. The portable device as recited in claim 1 , wherein the first loop, the second loop, and the third loop are configured to include rectangular shapes that correspond to the progressively larger sized antennas loop areas.

5. The portable device as recited in claim 1 , wherein the first loop, the second loop, and the third loop are configured to overlap at least 80% of the corresponding antenna loop areas of the first, second, and third NFC reference listening devices.

6. The portable device as recited in claim 1 , wherein the first loop, the second loop, and the third loop are configured to maintain the substantial amount of mutual inductance with different sized antennas of the reference listening devices by configuring construction of each loop to have a separate reference from the other loop.

7. The portable device as recited in claim 1 , wherein the spiral shaped NFC coil antenna is made out 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 metal chassis and underneath conductive coating of a portable device.

8. The portable device as recited in claim 1 , wherein different sized antennas of the reference listening devices have different relative centers.

9. A near field communications (NFC) antenna comprising:
a continuous loop of coil antenna to form a planar spiral shaped NFC coil antenna to include an innermost loop, a middle loop, and an outermost loop, wherein the innermost loop, the middle loop, and the outermost loop are progressively larger in size based upon a substantial amount of mutual inductances obtained with reference to a first, a second, and a third reference listening devices, respectively, wherein the innermost loop, the middle loop and the outermost loop are multi-turn loops having two or more turns, wherein the first, the second, and the third reference listening devices have progressively larger sized sense coils areas; and
an NFC module to tune the coil antenna.

10. The NFC antenna in claim 9 , wherein the innermost loop, the middle loop, and the outermost loop are configured as a rectangular shape, a circular shape, or a dissimilar shape.

11. The NFC antenna in claim 9 , wherein the innermost loop, the middle loop, and the outermost loop are configured to overlap at least 80% of the corresponding antenna loop areas of the first, second, and third reference listening devices, which are NFC—Forum reference listening devices.

12. The NFC antenna in claim 9 , wherein the innermost loop is tied to the middle loop, and the middle loop are tied to the outermost loop.

13. The NFC antenna in claim 9 , wherein the planar spiral shaped NFC coil antenna is made out 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 metal chassis and underneath conductive coating of a portable device.

14. The NFC antenna in claim 9 , wherein different sized antennas of the reference listening devices have different relative centers.

15. A method of constructing a spiral shaped near field communications (NFC) coil antenna for a portable device comprising:
constructing an innermost loop of the spiral shaped NFC coil antenna;
constructing a middle loop that is tied to the innermost loop;
constructing an outermost loop that is tied to the middle loop, wherein the innermost loop, the middle loop, and the outermost loop are progressively larger in size based upon a substantial amount of mutual inductances obtained with reference to a first, a second, and a third reference listening devices, respectively, wherein the innermost loop, the middle loop and the outermost loop are disposed on a single plane, and wherein the first, the second, and the third reference listening devices have progressively larger sized sense coils areas; and
integrating the spiral shape NFC coil antenna to the portable device.

16. The method in claim 15 , wherein the innermost loop, the middle loop, and the outermost loop are used to read credit cards, tags or devices, wherein the innermost loop, the middle loop, and the outermost loop are based upon loop areas of different sense coil designs as defined by listeners 6, 3, and 1, respectively.

17. The method in claim 15 , wherein constructing the innermost loop, the middle loop, and the outermost loop are based on a ratio of loop areas that are covered by the different sized listener sense coils as defined by listeners 6, 3, and 1.

18. The method in claim 15 , wherein the spiral shaped NFC coil antenna is rectangular in shape.

19. The method in claim 15 , wherein constructing the innermost loop, middle loop and the outermost loop include maintaining of the substantial amount of mutual inductance with different sized antennas of the reference listening devices by configuring the construction of each loop to be based from a separate reference from the other loop.

20. The method of claim 15 , wherein the different sized antennas of the reference listening devices have different relative centers.

Assignees

• Konanur Anand S
• Karacaoglu Ulun
• Yang Songnan
• Intel Corp

Inventors

• Konanur Anand S
• Karacaoglu Ulun
• Yang Songnan

Classifications

• H01F5/003 Primary

  Printed circuit coils · CPC title

• H01Q1/2216

  used in interrogator/reader equipment · CPC title

• H04B5/0081

  Electricity · mapped topic

• H01Q1/2266

  disposed inside the computer · CPC title

• Y10T29/49016

  Antenna or wave energy "plumbing" making · CPC title