Tuned radio frequency identification (RFID) circuit used as a security device for wristbands and package security

• US 7,377,447 B2
• Filed: 12/05/2005
• Issued: 05/27/2008
• Est. Priority Date: 12/05/2005
• Status: Expired due to Fees

• Current Assignee: RCD Technology Corporation
• Original Assignee: RCD Technology Corporation
• Inventors: Oberle, Robert R.
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US11/294,216
• Publication Number:
  US 20070125867A1
• Time in Patent Office: 904 Days
• Field of Search: 235/451, 235/380, 235/487, 235/492, 340/572.1, 340/572.3, 340/568.2, 340/572.8
• US Class Current: 235/492
• 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 19/07758 arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
• 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 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: G06K 19/0779 the antenna being foldable or folded
• CPC Class Codes: G06K 19/07798 part of the antenna or the integrated circuit being adapted for rupturing or breaking, e.g. record carriers functioning as sealing devices for detecting not-authenticated opening of containers electronic seals G09F3/03

Abstract

A tamper evident RFID circuit uses a fold section that forms a capacitive element when folded together.

Claims

1. An RFID circuit comprising:

an antenna portion on substrate,

a fold section;

wherein the fold section contains an adhesive layer and wherein when the fold section is folded together with the adhesive layer at least one capacitor is created which set the RF

response characteristics of the RFID circuit;

wherein the fold section has a center hole and the substrate has a strap that fits through the center hole, the strap having an RFID antenna portion that extends through the center hole when the strap is placed through the center hole and the fold section is folded down.

2. The RFID circuit of claim 1, wherein at least one capacitor would be damaged if the fold section is ripped apart after the fold section is folded down.

3. The RFID circuit of claim 1, wherein the substrate has printed indicia showing a center line of the fold section.

4. The RFID circuit of claim 1, wherein the strap is adhered with the adhesive layer with the fold section is folded down.

5. The RFID circuit of claim 4, wherein when the strap is adhered to the fold section the RFID circuit forms a wristband.

6. The RFID circuit of claim 5, wherein when the strap is adhered to the fold section the RFID antenna portion extends completely around the wristband such that the wristband can not be cut off without modifying the RF response of the RFID circuit.

7. The RFID circuit of claim 1, further comprises an RFID IC attached to a connector region.

8. The RFID circuit of claim 1, wherein the RFID circuit is an RFID wristband.

9. The RFID circuit of claim 1, wherein the RFID circuit is a security locking device.

10. An RFID wristband comprising;

a substrate;

an antenna portion of the substrate;

a strap on the substrate; and

a fold section on the substrate;

wherein the fold section contains an adhesive layer and wherein when the fold section is folded together with the adhesive layer at least one capacitor is created which sets the RF response of the RFID circuit, wherein the fold section has a hole that the strap portion fits into such that adhesive layer of the fold section can hold the strap in place;

wherein the strap has an RFID antenna portion that extends that through the center hole when the strap is placed through the center hole and the fold section is folded down.

11. The RFID wristband of claim 10, wherein when the strap is held in place with the adhesive, the strap is not under the any of the capacitors.

12. The RFID wristband of claim 10, wherein at least one capacitor can be damaged when the fold is ripped apart after the fold section is folded down.

13. The RFID wristband of claim 10, wherein the substrate has printed indicia showing a center line of the fold section.

14. The RFID wristband of claim 10, wherein when the strap is adhered to the wristband the RFID antenna portion extends completely around the wristband such that the wristband can not be cut off without modifying the RF response of the RFID circuit.

15. The RFID wristband of claim 10, further comprises an RFID IC attached to a connector region.