RFID tag mounting circuit board

• US 8,049,626 B2
• Filed: 02/28/2008
• Issued: 11/01/2011
• Est. Priority Date: 07/03/2007
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sakama, Isao, Ashizawa, Minoru
• Primary Examiner(s): Lee; Benjamin C
• Assistant Examiner(s): Shannon; Michael T
• Application Number:
  US12/039,422
• Publication Number:
  US 20090009330A1
• Time in Patent Office: 1,342 Days
• Field of Search: 3405721-5729, 343/850
• US Class Current: 340/572.8
• CPC Class Codes: G06K 19/04 characterised by the shape
• CPC Class Codes: G06K 19/0726 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
• 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 19/07758 arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• 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: H05K 1/0243 Printed circuits associated with mounted high frequency components
• CPC Class Codes: H05K 1/0266 Marks, test patterns or identification means
• CPC Class Codes: H05K 2201/10098 Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas

Abstract

An RFID tag mounting circuit board has a configuration in which an RFIC chip, a minimum antenna, a circuit which matches the impedance of the RFIC chip and that of the antenna are mounted on a printed circuit board. With this configuration, the area occupied by the antenna of an RFID tag is suppressed, and a decrease in the component mounting density of the printed circuit board is also suppressed. The RFID tag mounting circuit board is configured to be capable of managing the histories of all components on a per-printed-circuit-board basis by attaching a reading device for an RFIC chip to a chip mounter which mounts an IC chip.

Claims

1. An RFID tag mounting circuit board in which an RFID tag is mounted on a board, the RFID tag comprising:

an IC chip storing information;

an antenna connection terminal to which an antenna can be connected for sending the information stored in the IC chip by radio waves; and

an impedance matching circuit for the antenna,

wherein the impedance matching circuit is composed of a through hole pattern in the RFID tag mounting circuit board and printed patterns on upper and lower surfaces of the RFID tag mounting circuit board,

wherein the through hole pattern connects the printed patterns on the upper and lower surfaces of the RFID tag mounting circuit board to each other,

wherein a length of the printed pattern on the lower surface of the RFID tag mounting circuit board is varied in order to provide impedance matching, and

wherein the antenna connection terminal is arranged such that the antenna is connected so as to extend perpendicularly to the RFID tag mounting circuit board.

2. The RFID tag mounting circuit board according to claim 1, wherein the impedance matching circuit is composed of an uppermost layer and a lowermost layer on the RFID tag mounting circuit board.

3. The RFID tag mounting circuit board according to claim 1,

wherein the antenna is an external antenna connected to the antenna connection terminal which sends out the information stored in the IC chip.

4. The RFID tag mounting circuit board according to claim 3, wherein the external antenna is T-shaped.

5. The RFID tag mounting circuit board according to claim 4, wherein the T-shaped external antenna has a radiation antenna unit, and the radiation antenna unit is a dipole antenna with a length of λ

/2.

6. The RFID tag mounting circuit board according to claim 3, wherein the external antenna is an I-shaped monopole antenna.

7. The RFID tag mounting circuit board according to claim 6, wherein the I-shaped external antenna has a radiation antenna unit, and the radiation antenna unit is a monopole antenna whose length is an odd multiple of λ

/4.

8. The RFID tag mounting circuit board according to claim 3, wherein the external antenna is clip-shaped and protrudes away from the IC chip and connects to the IC chip by sandwiching the IC chip.

9. The RFID tag mounting circuit board according to claim 1, wherein the printed pattern on the lower surface of the RFID tag mounting circuit board has a meandering shape.

10. The RFID tag mounting circuit board according to claim 1, wherein one end of the printed pattern on the lower surface of the RFID tag mounting circuit board forming a part of the impedance matching circuit is connected to an adjacent printed pattern outside the RFID tag, and the RFID tag has a monopole antenna structure.

11. The RFID tag mounting circuit board according to claim 10, wherein the adjacent printed pattern outside the RFID tag has a length which is not less than λ

/4.