RFID tag

• US 20060208095A1
• Filed: 10/24/2005
• Published: 09/21/2006
• Est. Priority Date: 03/16/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kai, Manabu, Baba, Shunji, Maniwa, Toru, Yamagajo, Takashi, Nakanishi, Yuichi
• Granted Patent: US 7,516,901 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• CPC Class Codes: G06K 19/07372 by detecting tampering with the circuit
• 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 19/0775 arrangements for connecting the integrated circuit to the antenna
• CPC Class Codes: H01L 2224/16 of an individual bump connector
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/16227 the bump connector connecting to a bond pad of the item
• CPC Class Codes: H01L 2924/01087 Francium [Fr]
• CPC Class Codes: H01L 2924/3011 Impedance

Abstract

With the RFID comprising a transmitting and receiving antenna, a detecting block formed in the circumference of the antenna, and an electronic component connected to the antenna and detecting block to detect breakdown of the detecting block, illegal use can be prevented, matching between the tag antenna and IC chip can also be attained with inclusion of the detecting means, and higher radiation and receiving characteristics of antenna can also be obtained without deterioration of antenna gain. Moreover, the RFID is very effective for keeping security because illegal use of the RFID tag through re-adhesion thereof to an item can be prevented.

Claims

1. An RFID tag comprising:

a transmitting and receiving antenna;

a detecting block formed in a circumference of the antenna; and

an electronic component connected to the antenna and the detecting block operable to detect breakdown of the detecting block.

2. The RFID tag according to claim 1, wherein the detecting block has a length of a non-integer multiple of a half-wavelength of an operating frequency of the RFID tag.

3. The RFID tag according to claim 1, wherein the detecting block is formed of a conductive material and loops of two lines.

4. The RFID tag according to claim 1, wherein the detecting block is formed of loops in which a separation of two lines is narrow.

5. The RFID tag according to claim 1, wherein the detecting block is formed in a shape obtained by folding back a single loop.

6. The RFID tag according to claim 1, wherein the detecting block is formed in a U-shape attained by folding back the single loop.

7. The RFID tag according to claim 1, wherein the detecting block is formed of silver paste and the antenna is formed of copper.

8. The RFID tag according to claim 1, wherein the antenna is a folded dipole antenna, dipole antenna, fine dipole antenna, loop antenna, fine loop antenna, or meander structure.

9. The RFID tag according to claim 1, wherein the detecting block is formed of a conductive and transparent material.

10. An RFID tag comprising:

a transmitting and receiving antenna;

a detecting block formed in a circumference of the antenna;

an electronic component connected to the antenna and detecting block operable to detect breakdown of the detecting block;

a first film mounting the antenna, detecting block, and electronic component;

a second film covering the antenna, detecting block, and electronic component; and

a wall block provided at an external side to surround a part of the detecting block between the first film and the second film and is bonded only to the second film.

11. The RFID tag according to claim 10, wherein the wall block is formed of a thermosetting resin and is coated with a material, which may be peeled at a surface in contact with the first film.

12. The RFID tag according to claim 10, wherein the detecting block is formed of a conductive and transparent material.

13. The RFID tag according to claim 10, wherein the wall block and the second film are formed of an identical material.

14. The RFID tag according to claim 10, wherein the second film is provided with a cutting portion at the external circumference to include a part of the detecting block.

15. An RFID tag comprising:

a transmitting and receiving antenna;

a detecting block formed in a circumference of the antenna;

an electronic component connected to the antenna and the detecting block operable to detect breakdown of the detecting block; and

a substrate for mounting the antenna, detecting block, and electronic component.