Antenna Structure of a Radio Frequency Identification System Transponder

• US 20110284641A1
• Filed: 04/19/2009
• Published: 11/24/2011
• Est. Priority Date: 09/16/2008
• Status: Active Grant

• Current Assignee: Polychem UV/EB International Corp.
• Original Assignee: Polychem UV/EB International Corp.
• Inventors: YANG, Yung-Shu
• Granted Patent: US 8,232,923 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• 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: 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 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/45 Transponders
• CPC Class Codes: H04B 5/77 for interrogation

Abstract

The present invention is an antenna structure of a radio frequency identification system transponder, especially an antenna structure wherein an insulation layer and a foldback circuit, an opening of which faces toward a coupling part, are provided at corresponding positions of an antenna body which is provided with the coupling part. The foldback circuit is provided with a radio frequency integrated circuit, such that radio signals can be transmitted by induction by the foldback circuit and the coupling part. By this foldback circuit, an issue of directivity of the radio signals can be reduced, an effective read range of the radio signals can be increased, as well as a near field induction function and a far field induction function can be provided at a same time. Therefore, when manufacturing an RFID transponder, a production speed can be increased and production cost can be reduced.

Claims

1. An antenna structure of a radio frequency identification system transponder, comprising an antenna body which is provided with a coupling part, an insulation layer and a foldback circuit, wherein a gap of the foldback circuit, corresponding to the coupling part, faces toward a gap of the coupling part, with the opening being provided with an RFIC (Radio Frequency Interface Chip) that electrically connects the foldback circuit to form a loop circuit;

the insulation layer being provided between the coupling part of the antenna body and the foldback circuit.

2. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein the antenna body is provided on a non-conductive antenna substrate, the loop circuit is provided on the insulation layer, and the insulation layer is attached on the antenna body.

3. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein the RFIC is a printed electronics RFIC.

4. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein the coupling part is in a winding shape.

5. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein a part of edge of the loop circuit is arranged side by side vertically with a part of edge of the coupling part of the antenna body.

6. The antenna structure of a radio frequency identification system transponder, according to claim 2, wherein a part of edge of the loop circuit is arranged side by side vertically with a part of edge of the coupling part of the antenna body.

7. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein a part of the loop circuit is overlapped vertically with a part of the coupling part of the antenna body.

8. The antenna structure of a radio frequency identification system is transponder, according to claim 2, wherein a part of the loop circuit is overlapped vertically with a part of the coupling part of the antenna body.

9. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein a part of edge of the loop circuit is close to a part of edge of the coupling part of the antenna body vertically.

10. The antenna structure of a radio frequency identification system transponder, according to claim 2, wherein a part of edge of the loop circuit is close to a part of edge of the coupling part of the antenna body vertically.

11. The antenna structure of a radio frequency identification system transponder, according to claim 1, wherein the loop circuit that is constituted by the foldback circuit and the RFIC is a square loop circuit, a circular loop circuit, an elliptical lop circuit, a rectangular loop circuit, a triangular loop circuit or a polygonal loop circuit.

12. The antenna structure of a radio frequency identification system transponder, according to claim 2, wherein the loop circuit that is constituted by the foldback circuit and the RFIC is a square loop circuit, a circular loop circuit, an elliptical lop circuit, a rectangular loop circuit, a triangular loop circuit or a polygonal loop circuit.

13. An antenna structure of a radio frequency identification system transponder, comprising an antenna body which is provided with a coupling part, an antenna substrate and a foldback circuit, wherein the antenna body is provided on the non-conductive antenna substrate, and the foldback circuit is provided on a rear side of the antenna substrate and corresponds to the antenna body;

a gap of the foldback circuit that corresponds to the coupling part, faces toward a gap of the coupling part;

the opening being provided with an RFIC that electrically connects the foldback circuit to form a loop circuit.

14. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein an exterior surface of the loop circuit, far away from the antenna substrate, is provided with an insulation layer.

15. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein the coupling part is in a winding shape.

16. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein the RFIC is a printed electronics RFIC.

17. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein a part of edge of the loop circuit is arranged side by side vertically with a part of edge of the coupling part of the antenna body.

18. The antenna structure of a radio frequency identification system transponder, according to claim 14, wherein a part of edge of the loop circuit is arranged side by side vertically with a part of edge of the coupling part of the antenna body.

19. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein a part of the loop circuit is overlapped vertically with a part of the coupling part of the antenna body.

20. The antenna structure of a radio frequency identification system transponder, according to claim 14, wherein a part of the foldback circuit is overlapped vertically with a part of the coupling part of the antenna body.

21. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein a part of edge of the loop circuit is close vertically to a part of edge of the coupling part of the antenna body.

22. The antenna structure of a radio frequency identification system transponder, according to claim 14, wherein a part of edge of the loop circuit is close vertically to a part of edge of the coupling part of the antenna body.

23. The antenna structure of a radio frequency identification system transponder, according to claim 13, wherein the loop circuit that is constituted by the foldback circuit and the RFIC is a square loop circuit, a circular loop circuit, an elliptical loop circuit, a rectangular loop circuit, a triangular loop circuit or a polygonal loop circuit.

24. The antenna structure of a radio frequency identification system transponder, according to claim 14, wherein the loop circuit that is constituted by the foldback circuit and the RFIC is a square loop circuit, a circular loop circuit, an elliptical loop circuit, a rectangular loop circuit, a triangular loop circuit or a polygonal loop circuit.