REMOVABLE CARD FOR A CONTACTLESS COMMUNICATION, ITS UTILIZATION AND THE METHOD OF PRODUCTION.

• US 20100258639A1
• Filed: 08/10/2009
• Published: 10/14/2010
• Est. Priority Date: 08/29/2008
• Status: Active Grant

• Current Assignee: SMK Corporation
• Original Assignee: Logomotion, S.R.O.
• Inventors: Florek, Miroslav, Masaryk, Michal
• Granted Patent: US 9,054,408 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• CPC Class Codes: G06K 19/07732 the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks housings for electrical equipment in general, see H05K5/02
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• CPC Class Codes: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07783 the coil being planar
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/2275 associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H05K 1/117 Pads along the edge of rigid circuit boards, e.g. for pluggable connectors
• CPC Class Codes: H05K 1/165 incorporating printed inductors
• CPC Class Codes: H05K 2201/10098 Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas
• CPC Class Codes: H05K 2201/10159 Memory
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

Removable card for a contactless communication contains an antenna (4) formed of threads (10) placed on the external surface of the body (1) of the card and covered by a layer (7) of a ferromagnetic material. In advantageous adjustment the antenna (4) contains on one area (2) of the card eight threads (10) and both areas (2) of the card are covered by a layer (7) of a ferritic foil. The antenna (4) is connected to the series with element (12) with capacity and the resistance (11) on the other side. Resonant circuit is tuned in for the final frequency from 13.0 to 15.0 MHz. The signal from the antenna (4) is read between the first and the second thread (10) from the side of the element (12) with capacity. The production method for the antenna on the body of the removable card resides in the fact that a groove of the conductive path (5) shape is dredged on the surface of the card'"'"'s body (1), the groove is filled with a conductive material and a ferromagnetic material layer (7) is applied on the surface of the area (2) covering the antenna (4).

Claims

1-27. -27. (canceled)

28. A removable card for a mobile communication device, the card comprising:

a flat card body made from an electrically nonconductive material;

an antenna made of at least one thread of a conductive path on a first external nonconductive surface of the card body; and

a ferromagnetic material layer at least partially covering the antenna.

29. The removable card of claim 28, further comprising electrical contacts disposed on the surface of the card body, wherein the ferromagnetic material layer is located on a portion of the surface of the card body that is opposite to the portion of the card body on which the contacts are disposed, and wherein the ferromagnetic material layer extends to a margin of the surface of the card body.

30. The removable card of claim 28, wherein the conductive path and the ferromagnetic material extend from the surface of the card body by no more than 0.15 mm.

31. The removable card of claim 28, wherein the ferromagnetic material has a permeability relative to vacuum of 30 to 180.

32. The removable card of claim 31, wherein the ferromagnetic material has a permeability relative to vacuum of 50 to 150.

33. The removable card of claim 28, wherein the antenna has six to ten threads on the conductive path, the card body has a second external nonconductive surface opposite the first external nonconductive surface, and the first and second external nonconductive surfaces are covered with respective ferromagnetic material layers such that the antenna is disposed between the ferromagnetic layers.

34. The removable card of claim 28, wherein the threads of the conductive path are 75 to 125 μ

m wide, and gaps between adjacent threads are from 75 to 125 μ

m.

35. The removable card of claim 28, wherein the ferromagnetic layer is a foil having a thickness of 75 to 125 μ

m.

36. The removable card of claim 28, comprising a plurality of threads disposed spirally on the surface of the card body and a plurality of electrical contacts disposed on the surface of the card body, wherein the threads are contained within a rectangular perimeter, the perimeter defining a first side that extends into a margin of the surface of the card body that is opposite a portion of the card body on which the contacts are disposed.

37. The removable card of claim 36, wherein the rectangle has a width of 3.5 to 6.5 mm and a length of 6 to 10 mm.

38. The removable card of claim 28, wherein the antenna is connected in series to a capacitive element, forming a resonant circuit that is tuned to a frequency of 13.0 to 15.0 MHz.

39. The removable card of claim 38, wherein the antenna is connected in series to a resistive element that is located opposite the capacitive element.

40. The removable card of claim 39, wherein the resistive element has a resistance of 10 to 18Ω

.

41. The removable card of claim 38, wherein the antenna produces a signal that is read between a first thread, which is adjacent to the capacitive element, and a second thread, which is adjacent to the first thread.

42. The removable card of claim 28, comprising a receiving circuit having an initial complex impedance of 4000Ω

−

j2200Ω

at a frequency of 14 MHz.

43. The removable card of claim 28, wherein the card body is made of a subsidized thermoplastic.

44. The removable card of claim 28, wherein at least the portions of the card body on which the conductive path is formed are covered with a layer from subsidized thermoplastic.

45. The removable card of claim 28, further comprising a second antenna, and wherein the antennas form spiral induction coils that are located on opposite sides of the card body, the induction coils being connected to one another through holes in the card body.

46. The removable card of claim 28, wherein the conductive path is wound circumferentially around the card body such that the thread runs across the first surface of the card body, and then continues along a first edge of the card body to a second surface of the card body that is opposite to the first surface of the card body, and then along a second edge of the card body that is opposite to the first edge of the card body, and back to the first surface of the card body.

47. The removable card of claim 28, wherein the conductive path is repeatedly wound circumferentially around the card body such that the circumferentially wound conductive paths are parallel to one another.

48. The removable card of claim 28, further comprising a microprocessor and a second antenna, wherein the first antenna has a first contact that is connected to the microprocessor, and a second contact that is connected to ground, and wherein the second antenna has a first contact that is connected to the microprocessor.

49. The removable card of claim 48, wherein the antennas are tuned to different frequencies, the frequencies being in the range of 13.4 to 13.7 MHz.

50. The removable card of claim 28, wherein the card is a removable memory card for a mobile communication device.

54. A method for effecting an electronic payment authorization, the method comprising:

using a mobile communication device having a removable card as recited in claim 28 to authorize a payment transaction at a point-of-sale terminal via a contactless communication channel between the mobile communication device and the point-of-sale terminal.

51. A method of forming an antenna on a removable card for a mobile communication device, the card having a microprocessor and a flat card body made from an electrically nonconductive material, the method comprising:

forming a groove into a surface of the card body;

filling the groove with an electrically conductive material to form an antenna in a conductive path on the surface of the card body;

electrically connecting the antenna to the microprocessor;

at least partially covering the antenna with a ferromagnetic foil that is applied to the surface of the card body.

52. The method of claim 51, wherein forming the groove comprises forming the groove to a maximum depth of 0.005 to 0.05 mm from the surface of the card body, and wherein filling the groove comprises filling the groove with conductive material to the surface of the card body.

53. The method of claim 51, further comprising:

covering the card body with a layer of subsidized thermoplastic before the groove is formed into the card body.