Radio frequency identification functionality coupled to electrically conductive signage

• US 7,938,335 B2
• Filed: 04/18/2008
• Issued: 05/10/2011
• Est. Priority Date: 04/18/2007
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Banerjee, Swagata R., Sainati, Robert A., Jesme, Ronald D.
• Primary Examiner(s): TRAIL, ALLYSON NEEL
• Application Number:
  US12/106,107
• Publication Number:
  US 20080258875A1
• Time in Patent Office: 1,117 Days
• Field of Search: 235/492, 235/375, 235/380, 340/5.61, 340/10.1, 340/572.7, 340/928
• US Class Current: 235/492
• CPC Class Codes: G06K 19/0675 the resonating marks being of the surface acoustic wave [SAW] kind SAW devices per se H03H9/64
• 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 19/07752 using an interposer
• 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 19/07783 the coil being planar
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: H04Q 2209/47 using RFID associated with sensors
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.
• CPC Class Codes: Y10T 428/24934 including paper layer

Abstract

The present disclosure relates to multiple embodiments of a signage having radio-frequency responsive features, methods of making and using the signage, and the performance characteristics of the signage. These embodiments include a cutout, aperture, or opening in an electrically conductive sign into which or adjacent to which is placed an RFID tag or chip.

Claims

1. An electrically conductive, radio frequency identification (RFID)-enabled signage article, comprising:

a slot antenna including an electrically conductive element having an opening; and

an RFID integrated circuit coupled to the electrically conductive element, wherein the slot antenna operates as an RFID antenna;

wherein the electrically conductive element includes at least one of an electrically conductive substrate or an electrically conductive sheeting.

2. The signage article of claim 1, wherein the electrically conductive element is a conductive substrate positioned adjacent to optically active sheeting.

3. The signage article of claim 1, wherein the electrically conductive element is a non-conductive substrate positioned adjacent to conductive optically active sheeting.

4. The signage article of claim 1, wherein the electrically conductive sheeting is retroreflective sheeting.

5. The signage article of claim 1, further comprising:

a matching network electrically coupled in series between the RFID integrated circuit and the electrically conductive element that transforms the impedance between the RFID integrated circuit and the electrically conductive element.

6. The signage article of claim 5, wherein the matching network includes a transmission line structure.

7. The signage article of claim 1, including an electrically conductive substrate and an impedance of the antenna substantially matches an impedance of the RFID integrated circuit, and wherein the electrically conductive substrate is directly electrically coupled to the RFID integrated circuit.

8. The signage article of claim 1, further comprising a strap positioned to span at least a portion of the opening of the slot antenna and to electrically couple the RFID integrated circuit to the electrically conductive element.

9. The signage article of claim 8, wherein the RFID integrated circuit is attached to the strap.

10. The signage article of claim 8, wherein the strap and the RFID integrated circuit are substantially flush with a major surface of the electrically conductive element.

11. The signage article of claim 8, wherein the strap is positioned between a first major surface and a second major surface of the electrically conductive element such that the strap is within a thickness of the electrically conductive element.

12. The signage article of claim 8, wherein the strap has a thickness of at least 0.5 mil (0.0005 inch).

13. The signage article of claim 8, wherein the strap is in direct electrical contact with at least a portion of the electrically conductive element.

14. The signage article of claim 8, wherein the strap is capacitively coupled to at least a portion of the electrically conductive element.

15. The signage article of claim 1, wherein the opening forms a rectangular slot.

16. The signage article of claim 15, wherein the rectangular slot has a length and a width and the length of the rectangular slot is at least ten times greater than the width of the rectangular slot.

17. The signage article of claim 1, wherein the signage article comprises at least one of a traffic control material;

a vehicle marking;

a roadway marking;

a retroreflective garment;

an indoor/outdoor labeling product;

a frangible security sticker;

a product authentication material;

a store display package;

a document;

an inventory labeling and control product;

an identification tag;

an identification label;

an identification system;

a license plate;

or a road sign.

18. The signage article of claim 1, wherein the opening forms an annular ring.

19. The signage article of claim 1, wherein the opening is one slot in an array of slots.

20. The signage article of claim 1, wherein the RFID integrated circuit is an RFID integrated circuit utilized in a surface acoustic wave (SAW) RFID tag.

21. The signage article of claim 1, wherein the RFID integrated circuit stores information related to the signage article.

22. The signage article of claim 21, wherein the RFID integrated circuit stores the inspection history of the signage article.

23. A method of forming an electrically conductive, RFID-enabled signage article, comprising:

selecting an electrically conductive element having a length and a width;

forming an opening in at least a portion of the electrically conductive element; and

coupling a radio frequency identification (RFID) integrated circuit to the electrically conductive element;

wherein the selecting a substrate having a length and a width is based on a desired radiation direction/pattern of the electrically conductive, RFID-enabled signage article that is formed when the RFID integrated circuit is coupled with the electrically conductive element.

24. The method of claim 23, wherein the electrically conductive element is a conductive substrate positioned adjacent to optically active sheeting.

25. The method of claim 23, wherein the electrically conductive element is a non-conductive substrate positioned adjacent to conductive optically active sheeting.

26. The method of claim 23, wherein the coupling a radio frequency identification (RFID) integrated circuit to the electrically conductive element involves attaching the RFID integrated circuit to a strap and coupling the strap to the electrically conductive element.

27. The method of claim 23, further comprising:

selecting a matching network to transform the impedance between the RFID integrated circuit and the electrically conductive element; and

placing the matching network between the RFID integrated circuit and the electrically conductive element.

28. The method of claim 23, wherein the RFID integrated circuit is positioned asymmetrically off-center within the opening in the signage article to effect a desired direction of radiation.

29. The method of claim 23, wherein the RFID integrated circuit is positioned symmetrically and centered within the opening in the signage article to effect a desired direction of radiation.

30. A method, comprising:

selecting a location on an electrically conductive element;

forming an opening in at least a portion of the electrically conductive element at the selected location; and

coupling a radio frequency identification (RFID) integrated circuit to at least a portion of the electrically conductive element;

wherein the selecting a location on the electrically conductive element is based on a desired radiation direction/pattern of a electrically conductive, RFID-enabled signage article that is formed when the RFID integrated circuit is coupled with the electrically conductive element.