Microstrip antenna for an identification appliance

• US 20030169207A1
• Filed: 03/05/2002
• Published: 09/11/2003
• Est. Priority Date: 03/05/2002
• Status: Active Grant

• Current Assignee: Precision Dynamics Corporation (Brady Corporation)
• Original Assignee: Precision Dynamics Corporation (Brady Corporation)
• Inventors: Beigel, Michael L.
• Granted Patent: US 6,888,502 B2
• Time in Patent Office: Days
• US Class Current: 343/718
• CPC Class Codes: G06K 19/07762 the adhering arrangement making the record carrier wearable, e.g. having the form of a ring, watch, glove or bracelet record carriers for insertion in the human body for medical purposes A61B90/00; record carriers adapted for attachment to animals A01K11/00
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• 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 1/273 Adaptation for carrying or wearing by persons or animals
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/0471 Non-planar, stepped or wedge-shaped patch

Abstract

An identification appliance, such as a wristband, bracelet, patch, headband, necklace, card, sticker, or other wearable appliance, has an improved patch or microstrip antenna. The microstrip antenna comprises a conductive patch layer, a conductive ground layer and a dielectric layer in between the conductive layers. The microstrip antenna is mounted to or disposed in the identification appliance, where preferably the ground layer is closest to the user and the patch layer is furthest from the user. Electronic circuits may be located in the dielectric layer, on a surface of a conductive layer, or on another part of the identification appliance. Connecting holes through the dielectric layer may allow circuits to be connected to a conductive layer or layers. This improved antenna resolves detuning and communication degradation problems.

Claims

1. A wireless identification band adapted to communicate with another device, the wireless identification band comprising:

a structure adapted to be worn by or attached to a person, the structure having a first surface and a second surface, the second surface being located closer to the person than the first surface when the structure is worn by or attached to the person;

a data storage device adapted to store data associated with the person;

a microstrip antenna disposed on or in the structure; and

a control circuit coupled to the microstrip antenna, the control circuit adapted to communicate through the microstrip antenna with the device.

2. The wireless identification band of claim 1 wherein the microstrip antenna comprises a conductive patch layer, a conductive ground layer and a dielectric material disposed between the patch layer and the ground layer, the ground layer being located closer to the person than the patch layer when the structure is worn by or attached to the person.

3. The wireless identification band of claim 1 wherein the microstrip antenna is flexible.

4. The wireless identification band of claim 2 wherein the dielectric material is flexible.

5. The wireless identification band of claim 1 wherein the microstrip antenna is curved or contoured to be worn by the person.

6. The wireless identification band of claim 1 wherein the control circuit includes a communication circuit.

7. The wireless identification band of claim 2 wherein the control circuit is disposed on the dielectric material.

8. The wireless identification band of claim 2 wherein the control circuit is disposed in the dielectric material.

9. The wireless identification band of claim 8 wherein the control circuit is disposed on the surface of the patch layer which is inside the dielectric material.

10. The wireless identification band of claim 8 wherein the control circuit is disposed on the surface of the ground layer which is inside the dielectric material.

11. The wireless identification band of claim 2 wherein the control circuit is disposed on a surface of the ground layer which is not inside the dielectric material.

12. The wireless identification band of claim 11 further comprising an electrical coupler extending from the control circuit through the dielectric material to the patch layer.

13. The wireless identification band of claim 12 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

14. The wireless identification band of claim 12 wherein the electrical coupler is a conductive conduit which extends from the control circuit to the patch layer.

15. The wireless identification band of claim 7 further comprising an electrical coupler extending from the control circuit through the dielectric material to the patch layer or the ground layer or both the patch layer and the ground layer.

16. The wireless identification band of claim 15 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

17. The wireless identification band of claim 15 wherein the electrical coupler is a conductive conduit which extends from the control circuit to the patch layer or the ground layer or both the patch layer and the ground layer.

18. The wireless identification band of claim 8 further comprising an electrical coupler extending from the control circuit through the dielectric material to the patch layer or to the ground layer or to both the patch layer and the ground layer.

19. The wireless identification band of claim 18 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

20. The wireless identification band of claim 18 wherein the electrical coupler is a conductive conduit which extends from the control circuit to the patch layer or to the ground layer or to both the patch layer and the ground layer.

21. The wireless identification band of claim 7 wherein the control circuit is located adjacent to the patch layer.

22. The wireless identification band of claim 2 wherein the control circuit is disposed on a surface of the patch layer which is not inside the dielectric material.

23. The wireless identification band of claim 22 further comprising an electrical coupler extending from the control circuit through the dielectric material to the ground layer.

24. The wireless identification band of claim 23 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

25. The wireless identification band of claim 23 wherein the electrical coupler is a conductive conduit which extends from the control circuit to the ground layer.

26. The wireless identification band of claim 1 wherein the structure comprises at least two layers and the microstrip antenna is embedded between the at least two layers.

27. The wireless identification band of claim 1 wherein the patch layer is disposed on an edge of the structure.

28. The wireless identification band of claim 6 wherein the control circuit comprises a radio frequency identification (RFID) circuit.

29. The wireless identification band of claim 1 wherein the control circuit is adapted to communicate with a wireless communication system.

30. The wireless identification band of claim 1 further comprising an audio or visual display coupled to the control circuit.

31. The wireless identification band of claim 1 wherein the control circuit is formed substantially of at least one organic material.

32. The wireless identification band of claim 31 wherein the control circuit is formed entirely of at least one organic material.

33. The wireless identification band of claim 1 wherein the data includes biometric data about the person.

34. The wireless identification band of claim 33 wherein the biometric data includes fingerprint, voice, or retinal characteristics.

35. The wireless identification band of claim 1 wherein the structure is an elongate wristband, armband, legband, or headband.

36. The wireless identification band of claim 1 further comprising a power source formed at least partially out of an organic material.

37. The wireless identification band of claim 1 further comprising a diode formed of an organic material.

38. The wireless identification band of claim 1 wherein the data storage device includes a memory formed of an organic material.

39. The wireless identification band of claim 1 wherein the thickness of the dielectric material is on the order of one-hundredth of the free space wavelength of a signal radiated by the microstrip antenna.

40. The wireless identification band of claim 1 further comprising a closure mechanism, the microstrip antenna being a portion of the closure mechanism.

41. The wireless identification band of claim 40 wherein tampering or opening of the closure mechanism after closure of the closure mechanism causes the control circuit to determine that tampering has occurred.

42. The wireless identification band of claim 41 wherein the control circuit is adapted to inform the device that tampering has occurred.

43. The wireless identification band of claim 41 further comprising an indicator coupled to the control circuit which indicates whether tampering has occurred.

44. The wireless identification band of claim 1 further comprising a keypad to input data into the data storage device.

45. The wireless identification band of claim 1 wherein the wireless identification band is disposable.

46. The wireless identification band of claim 1 wherein the control circuit is adapted to communicate at or near 400 MHz, 915 MHz, 2.45 GHz, or 5.88 GHz.

47. The wireless identification band of claim 1 wherein the control circuit includes a plurality of circuits.

48. The wireless identification band of claim 1 wherein the data includes medical data about the person.

49. The wireless identification band of claim 1 wherein the microstrip antenna is a continuous radiator.

50. The wireless identification band of claim 1 further comprising a flexible battery coupled to power the control circuit.

51. The wireless identification band of claim 1 wherein the flexible battery comprises an organic material.

52. A wireless identification appliance adapted to communicate with another device, the identification appliance comprising:

a structure adapted to be worn, attached or carried by a person;

a data storage device adapted to store data associated with the person;

a microstrip antenna disposed on or in the structure such that when the structure is worn, attached or carried by the person, the microstrip antenna is adapted to radiate energy away from the person and to radiate substantially less energy toward the person; and

a control circuit coupled to the microstrip antenna, the control circuit adapted to communicate through the microstrip antenna with the device.

53. The identification appliance of claim 52 wherein the microstrip antenna comprises a conductive patch layer, a conductive ground layer and a dielectric material disposed between the patch layer and the ground layer, the ground layer being located closer to the person than the patch layer when the structure is worn, attached or carried by the person.

54. The identification appliance of claim 52 wherein the microstrip antenna is flexible.

55. The identification appliance of claim 52 wherein the microstrip antenna is curved or contoured to be worn by the person.

56. The identification appliance of claim 52 wherein the control circuit includes a communication circuit.

57. The identification appliance of claim 53 wherein the control circuit is disposed on the dielectric material.

58. The identification appliance of claim 53 wherein the control circuit is disposed in the dielectric material.

59. The identification appliance of claim 58 wherein the control circuit is disposed on the surface of the patch layer which is inside the dielectric material.

60. The identification appliance of claim 58 wherein the control circuit is disposed on the surface of the ground layer which is inside the dielectric material.

61. The identification appliance of claim 53 wherein the control circuit is disposed on a surface of the ground layer which is not inside the dielectric material.

62. The identification appliance of claim 61 further comprising an electrical coupler extending from the control circuit through the dielectric material to the patch layer.

63. The identification appliance of claim 62 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

64. The identification appliance of claim 62 wherein the electrical coupler is a conductive conduit extending from the control circuit to the patch layer.

65. The identification appliance of claim 57 further comprising an electrical coupler extending from the control circuit through the dielectric material to the patch layer or the ground layer or both the patch layer and the ground layer.

66. The identification appliance of claim 65 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

67. The identification appliance of claim 65 wherein the electrical coupler is a conductive conduit extending from the control circuit to the patch layer or the ground layer or both the patch layer and the ground layer.

68. The identification appliance of claim 58 further comprising an electrical coupler extending from the control circuit through the dielectric material to the patch layer or to the ground layer or to both the patch layer and the ground layer.

69. The identification appliance of claim 68 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

70. The identification appliance of claim 68 wherein the electrical coupler is a conductive conduit extending from the control circuit to the patch layer or to the ground layer or to both the patch layer and the ground layer.

71. The identification appliance of claim 57 wherein the control circuit is located adjacent to the patch layer.

72. The identification appliance of claim 53 wherein the control circuit is disposed on a surface of the patch layer which is not inside the dielectric material.

73. The identification appliance of claim 72 further comprising an electrical coupler extending from the control circuit through the dielectric material to the ground layer.

74. The identification appliance of claim 73 wherein the electrical coupler comprises a hole and a conductor passing through the hole.

75. The identification appliance of claim 73 wherein the electrical coupler is a conductive conduit extending from the control circuit to the ground layer.

76. The identification appliance of claim 52 wherein the structure comprises at least two layers and the microstrip antenna is embedded between the at least two layers.

77. The identification appliance of claim 52 wherein the patch layer is disposed on an edge of the structure.

78. The identification appliance of claim 56 wherein the control circuit comprises a radio frequency identification (RFID) circuit.

79. The identification appliance of claim 52 wherein the control circuit is formed substantially of at least one organic material.

80. The identification appliance of claim 79 wherein the control circuit is formed entirely of at least one organic material.

81. The identification appliance of claim 52 wherein the data includes biometric data about the person.

82. The identification appliance of claim 52 wherein the structure is an elongate wristband, armband, legband, or headband.

83. The identification appliance of claim 52 further comprising a power source formed at least partially out of an organic material.

84. The identification appliance of claim 52 further comprising a diode formed of an organic material.

85. The identification appliance of claim 52 wherein the data storage device includes a memory formed of an organic material.

86. The identification appliance of claim 53 wherein the thickness of the dielectric material is on the order of one-hundredth of the free space wavelength of a signal radiated by the microstrip antenna.

87. The identification appliance of claim 52 further comprising a closure mechanism, the microstrip antenna being a portion of the closure mechanism.

88. The identification appliance of claim 87 wherein tampering or opening of the closure mechanism after closure of the closure mechanism causes the control circuit to determine that tampering has occurred.

89. The identification appliance of claim 88 further comprising an indicator coupled to the control circuit which indicates whether tampering has occurred.

90. The identification appliance of claim 52 wherein the microstrip antenna is a continuous radiator.

91. The identification appliance of claim 52 wherein the identification appliance is an identification card.

92. The identification appliance of claim 52 wherein the identification appliance is a patch that can be affixed to an article of clothing.

93. The identification appliance of claim 52 further comprising a flexible battery coupled to power the control circuit.

94. The identification appliance of claim 52 wherein the flexible battery comprises an organic material.