Device with coil antenna

Abstract

A device with a coil antenna is disclosed. The coil antenna defines an aperture. The device further comprises a magnetic flux guide adapted to guide magnetic fluxes so that the guided magnetic fluxes pass through the aperture of the coil antenna. For example, the magnetic flux guide is made of a sheet-shaped magnetic material such as a complex magnetic sheet, which comprises soft magnetic powder particles and a binder agent binding them.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a device in accordance with a first embodiment of the present invention;

FIG. 2 is a perspective view showing a semiconductor chip and a coil antenna of FIG. 1;

FIG. 3 is a perspective view showing a magnetic flux guide of FIG. 1;

FIG. 4 is a cross-sectional view showing an application structure including the device of FIG. 1;

FIG. 5 is a perspective view showing a device in accordance with a second embodiment of the present invention;

FIG. 6 is a perspective view showing a magnetic flux guide of FIG. 5;

FIG. 7 is a perspective view showing a non-contact IC card in accordance with a third embodiment of the present invention;

FIG. 8 is a plan view showing a structure of FIG. 7, which includes a semiconductor chip and a coil antenna; and

FIG. 9 is a plan view showing a magnetic flux guide of FIG. 7.

Claims

1. A device comprising: a semiconductor chip;a coil antenna electrically connected to the semiconductor chip, the coil antenna having a bottom portion and defining an aperture; anda magnetic flux guide comprising a first portion and a second portion connected to the first portion, the first portion supporting the bottom portion of the coil antenna, the second portion being positioned within or traversing the aperture of the coil antenna.

2. The device according to claim 1, wherein the coil antenna is made of a flat coil.

3. The device according to claim 1, wherein the coil antenna is made of a single layer flat coil.

4. The device according to claim 1, wherein the coil antenna has a flat shape.

5. The device according to claim 4, wherein the flat shape is a flat annular shape.

6. The device according to claim 1, wherein the magnetic flux guide is made of a magnetic material.

7. The device according to claim 6, wherein the magnetic material is a complex magnetic material comprising soft magnetic powder particles and a binder agent binding them.

8. The device according to claim 1, wherein the magnetic flux guide is made of a single magnetic material sheet.

9. The device according to claim 1, wherein the bottom portion defines a flat surface perpendicular to a vertical direction; the first portion has a flat shape having an inner edge, the inner edge defining a shape smaller than the aperture of the coil antenna, the inner edge being positioned within the aperture of the coil antenna as seen along the vertical direction; and the second portion extends from the inner edge of the first portion.

10. The device according to claim 9, wherein the second portion consists of a plurality of sub-portions each extending from the inner edge of the first portion.

11. The device according to claim 1, wherein: the second portion is a base portion having an outer edge, the outer edge of the second portion defining a shape smaller than the aperture of the coil antenna; the first portion consists of two or more lower flaps, each of the lower flaps extending outwardly from the outer edge of the second portion; the magnetic flux guide further comprising a third portion consisting of two or more upper flaps, each of the upper flaps extending outwardly from the outer edge of the second portion; and the lower flaps of the first portion are brought into contact with the bottom portion of the coil antenna while the upper flaps of the third portion are brought into contact with the top portion of the coil antenna so that the coil antenna is held by the first and the third portions and is positioned there between.

12. The device according to claim 11, wherein each of the upper flaps is positioned between neighboring two flaps of the lower flaps on a periphery of the second portion.

13. The device according to claim 1, wherein the second portion has a guide aperture smaller than the aperture of the coil antenna.

14. A device comprising: a semiconductor chip;a coil antenna electrically connected to the semiconductor chip, the coil antenna defining an aperture; anda magnetic flux guide adapted to guide magnetic fluxes so that the guided magnetic fluxes pass through the aperture of the coil antenna.

15. A radio frequency identification tag comprising the device according to claim 1.

16. A non-contact integrated circuit card comprising the device according to claim 1.