Smart NFC antenna matching network system having multiple antennas and user device including the same

• US 9,800,295 B2
• Filed: 08/23/2016
• Issued: 10/24/2017
• Est. Priority Date: 12/20/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Yohan, Song, Iljong, Roh, Hyounghwan, Lee, Youngki
• Primary Examiner(s): Bilodeau, David
• Application Number:
  US15/244,420
• Publication Number:
  US 20160359527A1
• Time in Patent Office: 427 Days
• Field of Search: None
• CPC Class Codes: G06Q 20/3278 RFID or NFC payments by means of M-devices
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/77 for interrogation

Abstract

A near field communication (hereinafter, referred to as “NFC”) antenna matching network system connected to an NFC transceiver is provided. The NFC antenna matching network system includes a matching circuit connected to first and second antenna terminals and to the NFC transceiver; and a plurality of NFC antennas connected in parallel and physically with the first and second antenna terminals, wherein each of the NFC antennas comprises a source coil connected between the first antenna terminal and the second antenna terminal; and a resonance coil physically separated from the source coil.

Claims

1. A near field communication (NFC) antenna connected to an NFC transceiver, the NFC antenna comprising:

a source coil connected between first and second terminals of the NFC transceiver, the source coil including a loop shape, the loop shape defining an inner space; and

a first resonance coil physically separated from the source coil,

wherein one or more turns of the first resonance coil are provided inside of the inner space.

2. The NFC antenna of claim 1, further comprising

a second resonance coil physically separated from the source coil,

wherein one or more turns of the second resonance coil are provided outside of the inner space.

3. The NFC antenna of claim 1, wherein a number of turns of the first resonance coil is greater than or equal to a number of turns of the source coil.

4. The NFC antenna of claim 1, wherein a number of turns of the source coil is greater than or equal to a number of turns of the first resonance coil.

5. The NFC antenna of claim 2,

wherein one end of the first resonance coil is connected to one end of the second resonance coil, and

wherein a number of turns of the first resonance coil is greater than or equal to a number of turns of the second resonance coil.

6. The NFC antenna of claim 2,

wherein one end of the first resonance coil is connected to one end of the second resonance coil, and

wherein a number of turns of the second resonance coil is greater than or equal to a number of turns of the first resonance coil.

7. The NFC antenna of claim 2,

wherein the source coil is on a first surface of a film, and the source coil includes one or more turns,

wherein the first resonance coil is on the first surface of the film, and

wherein the second resonance coil is on a second surface of the film.

8. The NFC antenna of claim 7, wherein one end of the first resonance coil and one end of the second resonance coil are electrically connected to each other.

9. The NFC antenna of claim 8, wherein the first resonance coil and the second resonance coil are electrically connected through a via hole penetrating the film.

10. The NFC antenna of claim 1, wherein the first resonance coil is within an area of about 20 cm² to about 54 cm².

11. The NFC antenna of claim 1, wherein the NFC antenna is on at least one of a front surface, a rear surface, a center, an outside, a flip cover and a battery pack of a mobile device.

12. A near field communication (NFC) antenna connected to an NFC transceiver, the NFC antenna comprising:

a first source coil connected to a first terminal of the NFC transceiver; and

a first resonance coil physically separated from the first source coil, the first resonance coil having a loop shape, the loop shape defining an inner space,

wherein one or more turns of the first source coil is provided inside of the inner space.

13. The NFC antenna of claim 12, further comprising

a second source coil physically separated from the first resonance coil, the second source coil being connected to a second terminal of the NFC transceiver,

wherein one or more turns of the second source coil are provided outside of the inner space.

14. The NFC antenna of claim 13, wherein a third source coil is between the first source coil and the second source coil.

15. The NFC antenna of claim 14, further comprising:

a second resonance coil corresponding to the second source coil; and

a third resonance coil corresponding to the third source coil.

16. The NFC antenna of claim 15, wherein each of the first to third resonance coils is physically separated from a corresponding source coil.

17. The NFC antenna of claim 13, wherein one end of the first source coil and one end of the second source coil are electrically connected to each other.

18. The NFC antenna of claim 12, wherein a number of turns of the first resonance coil is greater than or equal to a number of turns of the first source coil.

19. The NFC antenna of claim 12, wherein a number of turns of the first source coil is greater than or equal to a number of turns of the first resonance coil.

20. The NFC antenna of claim 13,

wherein one end of the first source coil is connected to one end of the second source coil, and

wherein a number of turns of the first source coil is greater than or equal to a number of turns of the second source coil.

21. The NFC antenna of claim 13,

wherein one end of the first source coil is connected to one end of the second source coil, and

wherein a number of turns of the second source coil is greater than or equal to a number of turns of the first source coil.

22. The NFC antenna of claim 12, wherein the first resonance coil is within an area of about 20 cm² to about 54 cm².

23. The NFC antenna of claim 12, wherein the NFC antenna is on at least one of a front surface, a rear surface, a center, an outside, a flip cover and a battery pack of a mobile device.

24. A near field communication (NFC) antenna matching network system connected to an NFC transceiver, the NFC antenna matching network system comprising:

a first serial resonator having a first source coil, the first serial resonator being between a first and second terminals of the NFC transceiver;

a first parallel resonator electrically isolated from the first serial resonator, the first parallel resonator including a first resonance coil, the first resonance coil having a loop shape, the loop shape defining an inner space, the first parallel resonator configured to exchange signals with the first serial resonator via inductive coupling; and

a matching circuit electrically connected between the NFC transceiver and the first serial resonator, the matching circuit configured to match impedances within the NFC antenna matching network system,

wherein one or more turns of the first source coil is provided inside the inner space.

25. The NFC antenna matching network system of claim 24, wherein a number of turns of the first source coil is greater than or equal to a number of turns of the first resonance coil.

26. The NFC antenna matching network system of claim 24, wherein a number of turns of the first resonance coil is greater than or equal to a number of turns of the first source coil.

27. The NFC antenna matching network system of claim 24, wherein one or more turns of the first resonance coil are provided inside of the first inner space.

28. The NFC antenna matching network system of claim 27, further comprising:

a second parallel resonator including a second resonance coil physically separated from the first serial resonator,

wherein one or more turns of the second resonance coil are provided outside of the first inner space.

29. The NFC antenna matching network system of claim 28,

wherein one end of the first parallel resonator is connected to one end of the second parallel resonator, and

wherein a number of turns of the first resonance coil is greater than or equal to a number of turns of the second resonance coil.

30. The NFC antenna matching network system of claim 24, wherein one or more turns of the first source coil are provided inside of the inner space.

31. The NFC antenna matching network system of claim 30, further comprising a second serial resonator including a second source coil physically separated from the first parallel resonator,

wherein one or more turns of the second source coil are provided outside of the inner space.

32. The NFC antenna matching network system of claim 31,

wherein one end of the first serial resonator is connected to one end of the second serial resonator, and

wherein a number of turns of the first source coil is greater than or equal to a number of turns of the second source coil.

33. The NFC antenna matching network system of claim 24, wherein the first serial resonator and the first parallel resonator are on a first surface of a film.

34. The NFC antenna matching network system of claim 28,

wherein the first serial resonator is on a first surface of a film, and includes one or more turns,

wherein the first parallel resonator is on the first surface of the film, and

wherein the second parallel resonator is on a second surface of the film.

35. The NFC antenna matching network system of claim 24, wherein the matching circuit comprises:

a first capacitor connected between the first antenna terminal and the NFC transceiver; and

a second capacitor connected between the second antenna terminal and the NFC transceiver.

36. The NFC antenna matching network system of claim 35, wherein the matching circuit comprises:

at least one of a first resistor and a first inductor connected between the first capacitor and a first antenna terminal; and

at least one of a second resistor and a second inductor connected between the second capacitor and a second antenna terminal.

37. The NFC antenna matching network system of claim 24, wherein the first parallel resonator is within an area of about 20 cm² to about 54 cm².

38. A mobile device, comprising:

an application processor;

a near field communication (NFC) transceiver connected to the application processor;

a matching circuit connected to the NFC transceiver; and

at least one NFC antenna connected to the matching circuit,

wherein the matching circuit is configured to match impedances of the at least one NFC antenna and the NFC transceiver, and

wherein the at least one NFC antenna includes

a serial resonator including a first source coil connected between first and second terminals of the NFC transceiver; and

a parallel resonator including a first resonance coil electrically isolated from the serial resonator and configured to exchange signals with the serial resonator via inductive coupling, the first resonance coil having a loop shape, the loop shape defining an inner space,

wherein one or more turns of the first source coil is provided inside of the inner space.

39. The mobile device of claim 38, wherein the application processor is configured to execute a program for a mobile point-of-sale (POS).