Wireless IC device, clip-shaped RFID tag, and article having RFID tag

• US 10,169,689 B2
• Filed: 02/26/2018
• Issued: 01/01/2019
• Est. Priority Date: 04/28/2014
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Komaki, Kunihiro
• Primary Examiner(s): King, Curtis
• Application Number:
  US15/904,797
• Publication Number:
  US 20180181848A1
• Time in Patent Office: 309 Days
• Field of Search: None
• CPC Class Codes: G06K 19/04 characterised by the shape
• CPC Class Codes: G06K 19/077 Constructional details, e.g. mounting of circuits in the carrier
• 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: G06K 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• 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 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 5/371 Branching current paths
• 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 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

In a wireless IC device, a columnar body includes a metal body with an insulating film. A loop-shaped antenna conductor is provided on an upper surface of the columnar body via an insulating pedestal. The loop surface of the antenna conductor is parallel or substantially parallel to the upper surface of the columnar body. On the lower surface of a RFIC element, two terminal electrodes are provided. The RFIC element is mounted on the antenna conductor such that the two terminal electrodes are connected to both ends of the antenna conductor, respectively. One end of the connecting conductor is connected to the vicinity of one end of the antenna conductor, and the other end of the connecting conductor is connected to the upper surface of the columnar body.

Claims

1. A wireless IC device comprising:

an object including a metal body;

a loop conductor including a first loop end and a second loop end;

an RFIC element including a first terminal electrode and a second terminal electrode respectively connected to the first loop end and the second loop end; and

a connection conductor including a first end and a second end respectively connected to the loop conductor and the object;

wherein

a loop surface of the loop conductor extends along a surface of the object.

2. The wireless IC device according to claim 1, wherein

the RFIC element includes an RFIC chip including a first input/output terminal and a second input/output terminal respectively connected to the first terminal electrode and the second terminal electrode;

an electrical length between the first input/output terminal and the second input/output terminal is about ½

of a wavelength of a communication signal; and

an electrical length from a farthest end of the metal body based on the second end to the first input/output terminal is equal to or greater than about ½

of a wavelength of the communication signal.

3. The wireless IC device according to claim 2, wherein

the metal body includes a first edge different from a second edge corresponding to the farthest end of the metal body;

and

the second end is connected at the first edge to the object.

4. The wireless IC device according to claim 2, wherein

the RFIC element further includes a power feeding circuit located between the loop conductor and the RFIC chip;

and

the first terminal electrode and the second terminal electrode are connected through the power feeding circuit to the first input/output terminal and the second input/output terminal.

5. The wireless IC device according to claim 1, further comprising an insulator on the surface of the object;

wherein

the second end is connected through the insulator to the object.

6. The wireless IC device according to claim 1, wherein the loop conductor, the RFIC element, and the connection conductor are disposed on an upper surface of the metal body.

7. The wireless IC device according to claim 1, wherein a length from the first loop end to the second loop end of the loop conductor is A, the connection conductor is connected to the loop conductor within a range of length from the first loop end up to approximately A/4.

8. The wireless IC device according to claim 1, wherein a length from the first loop end to the second loop end of the loop conductor is A, the connection conductor is connected to the loop conductor within a range of length from the first loop end up to approximately A/8.

9. The wireless IC device according to claim 1, wherein the RFIC element includes an RFIC chip and a power feeding circuit board.

10. The wireless IC device according to claim 9, further comprising a sealing layer that seals the RFIC chip to the power feeding circuit board.

11. The wireless IC device according to claim 1, wherein the loop conductor defines an antenna conductor that includes a leg portion and a fixing portion.