Magnetic antenna, board mounted with the same, and RF tag

Patent metadata

Field	Value
Publication number	US-9397401-B2
Application number	US-98916209-A
Country	US
Kind code	B2
Filing date	Apr 22, 2009
Priority date	Apr 25, 2008
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

The present invention relates to a magnetic antenna for information communication using a magnetic field component which is capable of satisfying both reduction in size and improvement in communication sensitivity. The magnetic antenna of the present invention is used for transmitting and receiving information using an electromagnetic induction method, and comprises a central core formed of a magnetic material and a non-magnetic material, a coil-shaped electrode material wound around the core, and an insulating layer formed on at least one outside surface of the core on which the coil-shaped electrode material is provided, in which the magnetic material is separated into two or more parts through the non-magnetic material when viewed in a section of the core which is perpendicular to a magnetic flux passing therethrough.

First claim

The invention claimed is:

1. A magnetic antenna for transmitting and receiving information using an electromagnetic induction method, comprising a central core formed of a magnetic material and a non-magnetic material, a coil-shaped electrode material disposed outside of and wound around the magnetic material and the non-magnetic material of the central core, and an insulating layer formed on at least one outside surface of the core on which the coil-shaped electrode material is provided, in which the magnetic material is separated into two or more parts through the non-magnetic material when viewed in a section of the core which is perpendicular to a magnetic flux passing therethrough, wherein the coil-shaped electrode material is oriented relative to the magnetic material and the non-magnetic material such that each coil of the electrode material is concurrently wound around both the magnetic material and the non-magnetic material.

2. A magnetic antenna according to claim 1 , wherein the non-magnetic material is formed of a non-magnetic ferrite and/or a glass-based ceramic material.

3. A magnetic antenna according to claim 1 , wherein the core is formed by laminating the magnetic material and the non-magnetic material.

4. A magnetic antenna according to claim 1 , wherein the magnetic material and the non-magnetic material are formed into a lattice structure when viewed in a section of the core.

5. A magnetic antenna according to claim 1 , wherein the non-magnetic material is disposed outside of each of a plurality of circular portions formed of the magnetic material when viewed in a section of the core.

6. A magnetic antenna according to claim 1 , wherein an area ratio of all portions of the magnetic material to all portions of the non-magnetic material is not more than 1.0 when viewed in a section of the core.

7. A board comprising the magnetic antenna as defined in claim 1 , which is mounted thereon.

8. A communication device comprising the magnetic antenna as defined in claim 1 , which is mounted thereon.

9. An RF tag comprising the magnetic antenna as defined in claim 1 , which is mounted together with IC thereon.

10. A magnetic antenna for transmitting and receiving information using an electromagnetic induction method, comprising a central core formed of a magnetic material and a non-magnetic material, a coil-shaped electrode material disposed outside of and wound around the magnetic material and the non-magnetic material of the central core, an insulating layer formed on at least one outside surface of the core on which the coil-shaped electrode material is provided, or along an outer periphery of the core, and a conductive layer formed on at least one outside surface of the insulating layer, in which the magnetic material is separated into two or more parts through the non-magnetic material when viewed in a section of the core which is perpendicular to a magnetic flux passing therethrough, wherein the coil-shaped electrode material is oriented relative to the magnetic material and the non-magnetic material such that each coil of the electrode material is concurrently wound around both the magnetic material and the non-magnetic material.

11. A magnetic antenna according to claim 10 , wherein the non-magnetic material is formed of a non-magnetic ferrite and/or a glass-based ceramic material.

12. A magnetic antenna according to claim 10 , wherein the core is formed by laminating the magnetic material and the non-magnetic material.

13. A magnetic antenna according to claim 10 , wherein the magnetic material and the non-magnetic material are formed into a lattice structure when viewed in a section of the core.

14. A magnetic antenna according to claim 10 , wherein the non-magnetic material is disposed outside of each of a plurality of circular portions formed of the magnetic material when viewed in a section of the core.

15. A magnetic antenna according to claim 10 , wherein an area ratio of all portions of the magnetic material to all portions of the non-magnetic material is not more than 1.0 when viewed in a section of the core.

16. A board comprising the magnetic antenna as defined in claim 10 which is mounted thereon.

17. A communication device comprising the magnetic antenna as defined in claim 10 which is mounted thereon.

18. An RF tag comprising the magnetic antenna as defined in claim 10 which is mounted together with IC thereon.

Assignees

• Koujima Jun
• Kimura Tetsuya
• Doi Takanori
• Sato Yoshiro
• Toda Kogyo Corp

Inventors

• Koujima Jun
• Kimura Tetsuya
• Doi Takanori
• Sato Yoshiro

Classifications

• H01Q7/08 Primary

  Ferrite rod or like elongated core · CPC title

• G06K19/07749

  the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card · CPC title

• H05K1/165

  incorporating printed inductors · CPC title

• H05K2203/162

  Testing a finished product, e.g. heat cycle testing of solder joints · CPC title

• H01F41/16

  the magnetic material being applied in the form of particles, e.g. by serigraphy {, to form thick magnetic films or precursors therefor} (H01F41/18 {-H01F41/24} take precedence) · CPC title