Radio frequency resonant tags with conducting patterns connected via a dielectric film

• US 6,680,702 B2
• Filed: 01/11/2002
• Issued: 01/20/2004
• Est. Priority Date: 01/11/2002
• Status: Expired due to Fees

• Current Assignee: SCA Packaging Limited (Essity AB)
• Original Assignee: SCA Packaging Limited (Essity AB)
• Inventors: Dudek, Jan, Yde-Andersen, Steen, Lundsgaard, Jorgen Schjerning
• Primary Examiner(s): Nguyen, Hoang V.
• Application Number:
  US10/043,987
• Publication Number:
  US 20030132892A1
• Time in Patent Office: 739 Days
• Field of Search: 343/895, 343/700.MS, 340/572
• US Class Current: 343/700.0MS
• CPC Class Codes: G08B 13/2414 using inductive tags
• 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

Abstract

The present invention provides radio frequency resonant tags and methods of manufacturing these tags for use in detection of theft of article for sale. In these tags, the radio frequency is transmitted through a resonance circuit without the need for direct connection of a conducting pattern or conducting patterns, but rather via a dielectric film which is adjacent to the conducting pattern or separates the conducting patterns.

Claims

1. A resonant radio frequency tag comprising a resonant circuit containing a single conducting pattern having a first end and a second end and a dielectric film adjacent to or surrounding the single conducting pattern, said resonant circuit transmitting a selected frequency through single the conducting pattern from the first end to the second end and then back to the first end of the conducting pattern via the dielectric film without requiring direct connection of the first and second end of the conducting pattern.

2. A radio frequency resonant tag comprising a resonant circuit containing multiple conducting patterns each separated by a dielectric film, said resonant circuit transmitting a selected frequency through the multiple conducting patterns via the dielectric film without requiring direct connection of the multiple conducting patterns.

3. The radio frequency resonant tag of claim 2 wherein the multiple conducting patterns are identical.

4. The radio frequency resonant tag of claim 2 wherein the multiple conducting patterns are mirror images.

5. The radio frequency resonant tag of claim 2 wherein the multiple conducting patterns are non-matching.