RFID tag for metallic materials

• US 8,322,625 B2
• Filed: 03/09/2010
• Issued: 12/04/2012
• Est. Priority Date: 03/10/2009
• Status: Expired due to Fees

• Current Assignee: LS Industrial Systems Company Limited
• Original Assignee: LS Industrial Systems Company Limited
• Inventors: Choo, Jae Yul, Ryoo, Jeong Ki, Hong, Jin Kuk
• Primary Examiner(s): FRANKLIN, JAMARA ALZAIDA
• Application Number:
  US12/720,411
• Publication Number:
  US 20100230499A1
• Time in Patent Office: 1,001 Days
• Field of Search: 235/492, 3405721-5729
• 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 19/07771 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

Abstract

The present disclosure relates to an RFID (Radio frequency identification) tag for metallic materials, including a dielectric substrate, a tag chip arrayed on the dielectric substrate for storing an object data, a feeding loop connected across the tag chip for forming an inner space, and a metallic radiator connected across the feeding loop for receiving an electromagnetic signal from outside.

Claims

1. A radio-frequency identification (RFID) tag for metallic materials, the RFID tag comprising:

a dielectric substrate;

a tag chip positioned on an upper surface of the dielectric substrate and configured for storing object data;

a feeding loop positioned on the upper surface of the dielectric substrate and connected across the tag chip to form an inner space; and

a metallic radiator positioned on the upper surface of the dielectric substrate and connected across the feeding loop, the metallic radiator configured for receiving an electromagnetic signal from outside the RFID tag.

2. The RFID tag of claim 1, wherein the feeding loop comprises a plurality of grid cells.

3. The RFID tag of claim 1, wherein the metallic radiator comprises a plurality of grid cells.

4. The RFID tag of claim 1, wherein the inner space of the feeding loop comprises a rectangular shape having a first length and a second length, the first and second lengths configured to satisfy a predetermined reception sensitivity.

5. The RFID tag of claim 4, wherein the metallic radiator forms a straight line having a length and a thickness configured to satisfy the predetermined reception sensitivity.

6. The RFID tag of claim 5, wherein a ratio of the first length of the inner space relative to the length of the straight line is configured to satisfy the predetermined reception sensitivity.

7. The RFID tag of claim 5, wherein a ratio of the second length of the inner space relative to the thickness of the straight line is configured to satisfy the predetermined reception sensitivity.

8. The RFID tag of claim 1, wherein a first end and a second end of the metallic radiator are configured to merge at a point in a space above the tag chip to allow the metallic radiator to form a part of a fan-like arc.

9. The RFID tag of claim 1, wherein the feeding loop is configured to match an electromagnetic signal received through the metallic radiator to the tag chip.

10. The RFID tag of claim 1, wherein the metallic radiator comprises aluminum or copper.

11. The RFID tag of claim 1, wherein the dielectric substrate comprises a Polyethylene terephthalate (PET) substrate.