RFID tag and antenna arranging method

• US 20060232419A1
• Filed: 11/22/2005
• Published: 10/19/2006
• Est. Priority Date: 04/13/2005
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ochiai, Takanao, Tomioka, Takeshi
• Application Number:
  US11/283,921
• Publication Number:
  US 20060232419A1
• Time in Patent Office: Days
• US Class Current: 340/572.700
• CPC Class Codes: G06K 19/072 the record carrier comprising a plurality of integrated circuit chips
• 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 19/07767 the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies

Abstract

A non-contact integrated circuit (IC) tag accepts a plurality of frequency bands and provides sufficient performance in a compact size by freely arranging a plurality of antennas therein such that the antennas occupy a minimum area and by preventing interference between the antennas with an insulator.

Claims

1. An radio frequency identification (RFID) tag including a plurality of antennas, the RFID tag comprising:

an interference prevention unit that prevents interference between the antennas.

2. The RFID tag according to claim 1, wherein the interference prevention unit provides an insulator between the antennas to prevent the interference between the antennas.

3. The RFID tag according to claim 2, wherein the insulator is made of insulating resin.

4. The RFID tag according to claim 3, wherein the resin is polyethylene terephthalate.

5. The RFID tag according to claim 3 or 4, wherein the insulator is at least 2 mm thick.

6. The RFID tag according to claim 2, wherein the insulator is made of ceramics.

7. The RFID tag according to claim 2, wherein the insulator is made of insulating paper.

8. The RFID tag according to claim 1, wherein the interference prevention unit coats at least one of the antennas with a material that transmits electromagnetic waves of a frequency band to be transmitted and received by the corresponding antenna, to prevent the interference between the antennas.

9. A method, comprising:

arranging a plurality of antennas in an RFID tag; and

providing an insulator between the antennas to prevent interference between the antennas.

12. A method according to claim 9,

wherein the insulator is an insulating spacer and/or antenna insulating coating, made of insulating resin, including polyethylene terephthalate type resin, ceramics, paper, or any combinations thereof, and

the method further comprises:

controlling a thickness of the insulator according to a dielectric constant of the insulator material.

10. A method, comprising:

arranging a plurality of antennas in an RFID tag; and

coating at least one of the antennas with a material that transmits electromagnetic waves of a frequency band to be transmitted and received by the corresponding antenna, to prevent interference between the antennas.

11. A method according to claim 9 or 10, wherein the arranging comprises superposing the plurality of antennas in a medium forming the RFID tag.

13. An apparatus, comprising:

one or more integrated circuits (IC) to read/write data;

two or more antennas each accepting different electromagnetic spectrum frequency bands and communicably contacting the at least one IC;

a medium on which the one or more ICs and the two or more antennas are superposed; and

one or more insulators between and/or among the antennas to prevent electromagnetic interference between and/or among the antennas.

14. An apparatus according to claim 13, wherein the one or more ICs are passive and the two or more antennas are radio frequency antennas, the ICs and the antennas are inlayed according to a superposing arrangement on the medium to occupy a minimum area with respect to the antennas.

15. An apparatus according to claim 13, wherein a single IC comprises a plurality of antenna contacts that correspond to the two or more antennas.

16. An apparatus according to claim 13, wherein the at least one IC is passive, active, or any combinations thereof.

17. An apparatus according to any one of claims 13 to 16, wherein the insulator is an electromagnetic spectrum insulating spacer and/or antenna coating, made of insulating resin, including polyethylene terephthalate type resin, ceramics, paper, or any combinations thereof.

18. An apparatus according to any one of claims 13 to 16, wherein the two or more differing electromagnetic spectrum frequency band antennas comprise radio frequency antennas of high frequency (HF) band, ultra high frequency (UHF) band and microwave band.

19. An apparatus according to claim 18, wherein the (HF) antenna is a coil type antenna and the UHF and microwave antennas are dipole type antennas.

20. An apparatus according to claim 19,

wherein the insulator is an electromagnetic spectrum insulating spacer made of insulating resin, including polyethylene terephthalate type resin, ceramics, paper, or any combinations thereof, and

wherein the insulating spacer is arranged between the coil antenna for the HF band and the dipole antenna for the UHF band, and between the coil antenna for the HF band and the dipole antenna for the microwave band.

21. An apparatus according to claim 19,

wherein the insulator is an electromagnetic spectrum antenna insulating coating made of insulating resin, including polyethylene terephthalate type resin, ceramics, paper, or any combinations thereof, and

wherein the antenna insulating coating coats the coil antenna for the HF band.

22. An apparatus according to claim 13,

wherein the two or more differing electromagnetic spectrum frequency band antennas comprise radio frequency antennas of high frequency, ultra high frequency and microwave,

wherein the insulator is an antenna coating made of material that transmits electromagnetic waves of high frequency and blocks electromagnetic waves of ultra high frequency and microwave.