WIRELESS IC DEVICE AND ELECTROMAGNETIC COUPLING MODULE

• US 20110080331A1
• Filed: 09/27/2010
• Published: 04/07/2011
• Est. Priority Date: 10/02/2009
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: KATO, Noboru
• Granted Patent: US 8,994,605 B2
• Time in Patent Office: Days
• US Class Current: 343/803
• CPC Class Codes: G06K 19/07754 the connection being galvanic
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A wireless IC device includes a wireless IC chip, a feeder circuit substrate which is coupled to the wireless IC chip and includes a feeder circuit including an inductance element, and a radiation plate. The inductance element includes a plurality of stacked layers having coil conductors electrically connected, and a coil conductor electrically connected in a middle portion of the inductance element is arranged at an end position in the coil axis direction and faces a coupling portion of the radiation plate.

Claims

1. A wireless IC device comprising:

a wireless IC;

a feeder circuit coupled to the wireless IC and including an inductance element; and

a radiation plate coupled to the inductance element and arranged to radiate a transmission signal supplied from the feeder circuit and/or supply a reception signal to the feeder circuit;

wherein

the inductance element includes a plurality of stacked layers including electrically connected coil conductors, and a coil conductor electrically connected in a middle portion of the inductance element is arranged at an end position in a coil axis direction and faces the radiation plate.

2. The wireless IC device of claim 1, wherein the feeder circuit further includes a resonant circuit, and a frequency of the transmission signal and/or the reception signal is substantially equal to a resonant frequency of the resonant circuit.

3. The wireless IC device of claim 1, wherein the coil axis direction of the inductance element is perpendicular or substantially perpendicular to the wireless IC, and the coil conductor electrically connected in the middle portion of the inductance element is arranged at the end position opposite to a position of the wireless IC in the coil axis direction of the inductance element and faces the radiation plate.

4. The wireless IC device of claim 1, wherein the wireless IC and the inductance element are electrically connected to each other.

5. The wireless IC device of claim 1, wherein the feeder circuit includes two inductance elements, the two inductance elements being electrically connected to each other at end portions thereof in the coil axis direction.

6. The wireless IC device of claim 5, wherein the two inductance elements are each helically wound in opposite directions.

7. An electromagnetic coupling module comprising:

a wireless IC; and

a feeder circuit substrate including a feeder circuit including an inductance element coupled to the wireless IC;

wherein

the inductance element includes a plurality of stacked layers having coil conductors electrically connected, and a coil conductor electrically connected in a middle portion of the inductance element is arranged at an end position in a coil axis direction.

8. The electromagnetic coupling module of claim 7, wherein the coil axis direction of the inductance element is perpendicular or substantially perpendicular to the wireless IC, and the coil conductor electrically connected in the middle portion of the inductance element is arranged at the end position opposite to a position of the wireless IC in the coil axis direction of the inductance element.

9. The electromagnetic coupling module of claim 7, wherein the wireless IC and the inductance element are electrically coupled to each other.

10. The electromagnetic coupling module of claim 7, wherein the feeder circuit includes two inductance elements, the two inductance elements being electrically connected to each other at end portions thereof in the coil axis direction.

11. The electromagnetic coupling module of claim 10, wherein the two inductance elements are each helically wound in opposite directions.