Dipole tag antenna structure mountable on metallic objects using artificial magnetic conductor for wireless identification and wireless identification system using the dipole tag antenna structure

• US 8,325,104 B2
• Filed: 10/31/2007
• Issued: 12/04/2012
• Est. Priority Date: 12/04/2006
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Sim, Dong-Uk, Choi, Hyung-Do, Kwon, Jong-Hwa, Kim, Dong-Ho, Choi, Jae-Ick
• Primary Examiner(s): Choi, Jacob Y
• Assistant Examiner(s): McCain, Kyana R
• Application Number:
  US12/517,400
• Publication Number:
  US 20100007569A1
• Time in Patent Office: 1,861 Days
• Field of Search: 235/492, 343/795, 343/909
• US Class Current: 343/909
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 15/008 said selective devices having Sievenpipers' mushroom elements
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

Provided are a dipole tag antenna using an artificial magnetic conductor (AMC) for wireless identification and a wireless identification system using the dipole tag antenna. The dipole tag antenna includes: a substrate formed of a first dielectric material; a conductive ground layer formed underneath the substrate; an AMC layer formed on the substrate; the dipole tag antenna mounted on the AMC layer and comprising a wireless identification chip; and the AMC directly mounted on a conductor.

Claims

1. A dipole tag antenna structure directly mounted on a conductor using an AMC (artificial magnetic conductor) for wireless identification, comprising:

a substrate formed of a first dielectric material;

a conductive ground layer formed underneath the substrate;

an AMC layer formed on the substrate; and

the dipole tag antenna mounted on the AMC layer and comprising a wireless identification chip, wherein the substrate formed of the first dielectric material does not include vias connecting the AMC layer to the conductive ground layer.

2. The dipole tag antenna structure of claim 1, wherein the dipole tag antenna structure has a low-profile structure.

3. The dipole tag antenna structure of claim 1, wherein the AMC layer is formed in patterns in which unit cells having rectangular patch shapes are arrayed at predetermined distances.

4. The dipole tag antenna structure of claim 3, wherein the AMC layer comprises 8 unit cells having the rectangular patch shapes, wherein the 8 unit cells are disposed in a 4×

2 matrix formation with a first distance between each of the rows and a second distance between each of the columns.

5. The dipole tag antenna structure of claim 3, wherein a frequency characteristic and an identification distance of the dipole tag antenna are changed according to variations of a length of a side of each of the unit cells.

6. The dipole tag antenna structure of claim 3, wherein the wireless identification chip operates by receiving electrical waves.

7. The dipole tag antenna structure of claim 6, wherein the dipole tag antenna has a structure in the shape of “

˜

,” and

the wireless identification chip is disposed in a center of the dipole tag antenna.

8. The dipole tag antenna structure of claim 7, wherein the dipole tag antenna comprises two conductive plates which have rectangular shapes and openings, wherein the openings are respectively formed at sides of the two conductive plates to face each other, and the two conductive plates are connected to each other using a connector to form the structure in the shape of “

˜

.”

9. The dipole tag antenna structure of claim 8, wherein the connector is inserted into the openings to be connected to the two conductive plates so as to form slots in the openings.

10. The dipole tag antenna structure of claim 9, wherein a resonance frequency of the dipole tag antenna is adjusted according to variations of lengths of sides of the two conductive plates and lengths and widths of the slots.

11. The dipole tag antenna structure of claim 1, wherein the dipole tag antenna is mounted on the AMC layer at a distance ¼

or less of an electromagnetic wavelength from the conductive ground layer.

12. The dipole tag antenna structure of claim 1, wherein the substrate is formed of epoxy.

13. A wireless identification system manufactured using the dipole tag antenna structure of claim 1.

14. The wireless identification system of claim 13, wherein the dipole tag antenna structure has a low-profile structure.

15. The wireless identification system of claim 13, wherein the AMC layer comprises the unit cells which have the rectangular patch shapes and are arrayed at the predetermined distances.

16. The wireless identification system of claim 13, wherein the wireless identification chip operates by receiving the electric waves and is disposed in the center of the dipole tag antenna, and the dipole tag antenna has a structure in the shape of “

˜

.”

17. The wireless identification system of claim 13, wherein the wireless identification system is an (RFID) radio frequency identification system.

18. The dipole tag antenna structure of claim 1, wherein the dipole tag antenna is mounted directly on the AMC layer.