Reader coil antenna, and non-contacting type card identification system using the same

• US 6,642,896 B2
• Filed: 02/04/2002
• Issued: 11/04/2003
• Est. Priority Date: 02/03/2001
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Tae-Ho
• Primary Examiner(s): Le, Hoanganh
• Application Number:
  US10/061,352
• Publication Number:
  US 20020105470A1
• Time in Patent Office: 638 Days
• Field of Search: H01/Q 1.112, 343/867, 343/866, 343/741, 343/742
• US Class Current: 343/742
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment

Abstract

The present invention discloses a reader coil antenna, and a non-contacting type card identification system using the same for increasing the sensing region of the card reader system. The reader coil antenna includes an outer coil for forming a predetermined loop, and which forms a magnetic field by receiving a current, along with at least one inner coil disposed inside the loop of the outer coil, for generating a constructive interference in a direction of the magnetic field of the outer coil. The card identification system, of the present invention, includes a reader coil antenna which forms a magnetic field due to a signal applied to flow in a single direction, a card reader for transmitting an operating signal through the reader coil antenna, and decoding an input signal from a non-contacting type card, and a control unit for deciding identification of the non-contacting type card according to the decoded signal.

Claims

1. A reader coil antenna of a non-contacting type card identification system, comprising:

an outer coil forming a predetermined loop, and forming a magnetic field by receiving a current; and

at least one inner coil disposed inside the loop of the outer coil, wherein said at least one inner coil generates a constructive interference in a direction of the magnetic field formed by the outer coil,

wherein the outer coil and the inner coil are mounted on a printed circuit board, and wherein one side of the printed circuit board comprises a magnetic inducing layer coated with a non-conductive magnetic material.

2. The reader coil antenna according to claim 1, having at least two inner coils and wherein the inner coils are sequentially disposed in an internal direction from said outer coil.

3. The reader coil antenna according to claim 2, wherein one inner coil is used.

4. The reader coil antenna according to claim 1, wherein an identical direction current is supplied to both of said outer coil and said at least one inner coil.

5. The reader coil antenna according to claim 1, wherein the outer coil and the inner coil are incorporated into one coil.

6. The reader coil antenna according to claim 1, wherein the outer coil and the inner coil are formed in a circular loop.

7. The reader coil antenna according to claim 6, wherein the outer coil and the inner coil are concentrically aligned.

8. The reader coil antenna according to claim 1, wherein the outer coil and the inner coil consist of copper having a thickness of 30 to 40 μ

m.

9. The reader coil antenna according to claim 7, wherein a diameter of said circular loop of the inner coil ranges from 6 to 10 mm.

10. The reader coil antenna according to claim 1, wherein said inner coil creates an internal region inside of said inner coil and said magnetic inducing layer is disposed in said internal region.

11. The reader coil antenna according to claim 10, wherein a groove is formed in the internal region of the printed circuit board, and the magnetic inducing layer is correspondingly inserted into the groove.

12. The reader coil antenna according to claim 11, wherein the groove formed on the printed circuit board has a shape corresponding to the shape of said internal region.

13. A non-contacting type card identification system using a reader coil antenna, comprising:

a reader coil antenna which forms a magnetic field from a signal applied to flow in an single direction;

a card reader to transmit an operating signal through the reader coil antenna, and decode an input signal from a non-contacting type card; and

a control unit to decide identification of the non-contacting type card according to the decoded signal,

wherein the reader coil antenna comprises;

an outer coil forming a predetermined loop, and forming a magnetic field by receiving a current; and

at least one inner coil disposed inside the loop of the outer coil, wherein said at least one inner coil generates a constructive interference in a direction of the magnetic field formed by the outer coil, and

wherein the outer coil and the inner coil are mounted on a printed circuit board, and wherein one side of the printed circuit board comprises a magnetic inducing layer coated with a non-conductive magnetic material.

14. The system according to claim 13, further comprising a matching circuit disposed between the card reader and the reader coil antenna, said matching circuit matching signals of the reader coil antenna and the card reader.

15. The system according to claim 13, wherein the outer coil and the inner coil are incorporated into one coil.

16. The system according to claim 13, wherein said inner coil creates an internal region inside of said inner coil and said magnetic inducing layer is disposed in said internal region.

17. The system according to claim 16, wherein a groove is formed in the internal region of the printed circuit board, and the magnetic inducing layer is correspondingly inserted into the groove.