RFID device

• US 20070132591A1
• Filed: 12/08/2005
• Published: 06/14/2007
• Est. Priority Date: 12/08/2005
• Status: Active Grant

• Current Assignee: Kennedy Group (Ivan Bloom & Associates)
• Original Assignee: NCR Corporation
• Inventors: Khatri, Mohamed Fayaz
• Granted Patent: US 7,573,388 B2
• Time in Patent Office: Days
• US Class Current: 340/572.700
• 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 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• 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 19/30 the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

Abstract

A radio frequency identification device including a substantially planar surface. Surface has a longitudinal axis and lateral axis. A plurality of discrete longitudinally spaced laterally elongate conductive dipole elements is mounted to surface. In the present embodiment these elements include a director element, a reflector element, and a driven element that is positioned intermediate of the director element and the reflector element. A radio frequency identification chip is conductively attached to driven element.

Claims

1. A radio frequency identification device comprising:

a surface having a longitudinal axis and a lateral axis;

a plurality of discrete longitudinally spaced laterally elongate conductive elements mounted to the surface; and

a radio frequency identification chip conductively attached to one of the elements.

2. A radio frequency identification device according to claim 1 wherein the elements comprise:

a director element;

a reflector element; and

a driven element positioned intermediate of the director element and the reflector element.

3. A radio frequency identification device according to claim 2 wherein the radio frequency identification chip is conductively attached to the driven element.

4. A radio frequency identification device according to claim 2 wherein the director element, driven element and reflector element collectively define an antenna.

5. A radio frequency identification device according to claim 4 wherein at least one of the elements is configured to provide capacitive loading to the antenna.

6. A radio frequency identification device according to claim 5 wherein each element is configured to provide capacitive loading to the antenna.

7. A radio frequency identification device according to claim 6 wherein each element is substantially bowtie shaped.

8. A radio frequency identification device according to claim 5 wherein the radio frequency identification chip is responsive to a signal having a predefined wavelength, and the antenna has a maximum lateral dimension of less than half the predetermined wavelength.

9. A radio frequency identification device according to claim 1 wherein each element is defined by a center portion having a pair of oppositely directed laterally extending arms.

10. A radio frequency identification device according to claim 9 wherein the radio frequency identification chip is conductively attached to the center portion of the driven element.

11. A radio frequency identification device according to claim 9 wherein for each element the arms are substantially symmetrical about the center portion.

12. A radio frequency identification device according to claim 9 wherein the elements are centrally aligned about a longitudinal axis.

13. A radio frequency identification device according to claim 9 wherein for at least one element the arms comprise respective regions of increased longitudinal dimension in relation to the center portion.

14. A radio frequency identification device according to claim 13 wherein the regions progressively diverge from the center portion.

15. A radio frequency identification device according to claim 13 wherein the regions comprise lateral extremities of the arms.

16. A radio frequency identification device according to claim 9 wherein for each element the arms comprise respective regions of increased longitude dimension in relation to the center portion.

17. A radio frequency identification device according to claim 1 wherein the elements are evenly spaced, centrally aligned, and relatively increase in maximum lateral dimensions along a longitudinal progression.

18. A radio frequency identification device according to claim 1 wherein each element is symmetrical about a respective longitudinal axis, the longitudinal axes being parallel with each other.

19. A method for manufacturing a substrate for carrying a radio frequency identification tag comprising the steps of:

providing a substantially planar surface having a longitudinal axis and lateral axis;

imprinting on the surface a plurality of discrete longitudinally spaced laterally elongate conductive elements, wherein at least one of the elements is configured for conductively carrying a radio frequency identification chip.

20. A antenna for an radio frequency identification chip, the antenna comprising:

a director element;

a reflector element longitudinally spaced from the director element; and

a driven element for carrying the radio frequency identification chip, the driven element being longitudinally spaced from and positioned intermediate of the director element and the reflector element.