WIRELESS IC DEVICE

• US 20090201156A1
• Filed: 04/24/2009
• Published: 08/13/2009
• Est. Priority Date: 06/27/2007
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kato, Noboru
• Granted Patent: US 8,264,357 B2
• Time in Patent Office: Days
• US Class Current: 340/572.500
• 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 19/07756 the connection being non-galvanic, e.g. capacitive
• 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 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00

Abstract

A wireless IC device includes an electromagnetic coupler module including a wireless IC chip processing transmission and reception signals, and a feeder circuit board. In the wireless IC device, a first coupler defining a feeder circuit arranged on the feeder circuit board is electromagnetically coupled with a first mount of a first radiation plate, and a second coupler is electromagnetically coupled with a second mount of a second radiation plate. The couplers are respectively defined by line electrodes. Input and output terminal electrodes of the wireless IC chip are electrically connected to the line electrodes. The wireless IC chip is operated by the first and second couplers in response to a signal received by first and second radiation plates. A response signal from the wireless IC chip is radiated to the outside from the first and second radiation plates via the first and second couplers.

Claims

1. A wireless IC device, comprising:

a wireless IC chip having input and output terminals and arranged to process transmission and reception signals;

a feeder circuit board including a feeder circuit, the feeder circuit including at least one of a resonator circuit and a matching circuit, the feeder circuit including a first coupler and a second coupler, each coupler including an inductance element; and

a first radiation plate including a first mount having the feeder circuit board mounted thereon, and a second radiation plate including a second mount having the feeder circuit board mounted thereon, each radiation plate being made of a metal;

wherein

an electromagnetic coupler module having the feeder circuit board and the wireless IC chip mounted on the feeder circuit board is arranged with the input and output terminals of the wireless IC chip electrically connected to the feeder circuit;

the first coupler is electromagnetically coupled with the first mount and the second coupler is electromagnetically mounted with the second mount; and

the wireless IC chip is arranged to be operated by the first and second couplers in response to a signal received by the first and second radiation plates, and a response signal from the wireless IC chip is radiated to the outside from the first and second radiation plates via the first and second couplers.

2. The wireless IC device according to claim 1, wherein a width of the first coupler and the second coupler is greater than a width of the first mount and the second mount.

3. The wireless IC device according to claim 1, wherein the first coupler and the first mount partially overlap each other in plan view and the second coupler and the second mount partially overlap each other in plan view.

4. The wireless IC device according to claim 1, wherein the first coupler and the first mount substantially perpendicularly cross each other in plan view and the second coupler and the second mount substantially perpendicularly cross each other in plan view.

5. The wireless IC device according to claim 1, wherein at least one of the first mount and the second mount is meshed.

6. The wireless IC device according to claim 1, wherein at least one of the first coupler and the second coupler is arranged on a top surface and a bottom surface of the feeder circuit board.

7. The wireless IC device according to claim 1, wherein the first coupler and the second coupler include line electrodes that are axisymmetrical to each other with respect to the wireless IC chip.

8. The wireless IC device according to claim 1, wherein each of the first coupler and the second coupler includes a continuous line electrode.

9. The wireless IC device according to claim 1, wherein each of the first coupler and the second coupler includes a meandering line electrode.

10. The wireless IC device according to claim 1, wherein each of the first coupler and the second coupler includes a spiraling line electrode.

11. The wireless IC device according to claim 1, wherein each of the first coupler and the second coupler includes a line electrode including a branch at a predetermined location.

12. The wireless IC device according to claim 1, wherein the feeder circuit board includes a flexible board.