SYSTEM AND METHOD FOR NEAR FIELD COMMUNICATIONS ANTENNA FOR MOBILE DEVICES

• US 20160142107A1
• Filed: 11/13/2014
• Published: 05/19/2016
• Est. Priority Date: 11/13/2014
• Status: Active Grant

• Current Assignee: Stripe, Inc.
• Original Assignee: BBPOS Limited
• Inventors: CHOI, PETER, TSAI, HWAI SIAN
• Granted Patent: US 10,499,225 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Abstract

A system for an antenna for near field communications (NFC), said antenna comprising a primary loop with a primary current to produce a magnetic field; one or more secondary loops with one or more secondary currents; wherein by adjusting one or more variables associated with said one or more secondary loops, said magnetic field is modified to ensure antenna operation within a defined operating range.

Claims

1. A system for an antenna for near field communications (NFC), said antenna comprising:

a primary loop with a primary current to produce a magnetic field;

one or more secondary loops with one or more secondary currents;

wherein by adjusting one or more variables associated with said one or more secondary loops, said magnetic field is modified to ensure antenna operation within a defined operating range; and

said one or more variables comprising

(1) a number of secondary loops,

(2) one or more amplitudes of the one or more secondary currents in the one or more secondary loops,

(3) one or more phase differences between the one or more secondary currents in the one or more secondary loops and the primary current in the primary loop,

(4) one or more shapes of the one or more secondary loops,

(5) one or more dimensions of the one or more secondary loops, and

(6) one or more placements of the one or more secondary loops.

2. The system of claim 1, wherein said magnetic field is either enhanced or suppressed by adjusting

at least one placement of at least one of the one or more secondary loops, and

at least one phase difference of at least one of the one or more secondary currents.

3. The system of claim 1, further wherein by adjusting said one or more variables associated with said one or more secondary loops, said magnetic field is modified to ensure antenna operation within a defined operating range within an operating volume.

4. The system of claim 1, further wherein by adjusting said one or more variables associated with said one or more secondary loops, said operating volume is modified.

5. The system of claim 1, wherein said magnetic field is either enhanced or suppressed by adjusting

at least one amplitude of at least one of the one or more secondary currents;

and

at least one phase difference of at least one of the one or more secondary currents.

6. The system of claim 5, wherein said adjustment is performed using an adjustment module.

7. The system of claim 1, wherein said adjusting is performed based on at least one of:

numerical simulation;

analytical techniques; and

testing.

8. The system of claim 1, wherein said adjusting is performed to modify said symmetry of said magnetic field.

9. The system of claim 1, wherein said primary loop is rectangular.

10. The system of claim 1, wherein said one or more secondary loops are rectangular.

11. A method for an antenna for near field communications (NFC), said antenna comprising:

a primary loop with a primary current to produce a magnetic field;

one or more secondary loops with one or more secondary currents;

wherein said method comprises;

modifying said magnetic field to ensure antenna operation within a defined operating range;

said modifying based on adjusting one or more variables associated with said one or more secondary loops, wherein said one or more variables comprise

(1) a number of secondary loops,

(2) one or more amplitudes of the one or more secondary currents in the one or more secondary loops,

(3) one or more phase differences between the one or more secondary currents in the one or more secondary loops and the primary current in the primary loop,

(4) one or more shapes of the one or more secondary loops,

(5) one or more dimensions of the one or more secondary loops, and

(6) one or more placements of the one or more secondary loops.

12. The method of claim 11, wherein said modifying comprises either enhancing or suppressing said magnetic field by adjusting

at least one placement of at least one of the one or more secondary loops, and

at least one phase difference of at least one of the one or more secondary currents.

13. The method of claim 11, further wherein by adjusting said one or more variables associated with said one or more secondary loops, said magnetic field is modified to ensure antenna operation within said defined operating range within an operating volume.

14. The method of claim 11, further wherein said modifying comprises shaping said operating volume.

15. The method of claim 11, wherein said modifying of said magnetic field comprises either enhancing or suppressing said magnetic field by adjusting

at least one amplitude of at least one of the one or more secondary currents, and

at least one phase difference of at least one of the one or more secondary currents.

16. The method of claim 15, wherein said adjustment is performed using an adjustment module.

17. The method of claim 11, wherein said adjusting is performed based on at least one of:

numerical simulation;

analytical techniques; and

testing.

18. The method of claim 11, wherein said modifying comprises performing said adjusting to modify said symmetry of said magnetic field.

19. The method of claim 11, wherein said primary loop is rectangular.

20. The method of claim 11, wherein said one or more secondary loops are rectangular.