ANTENNA APPARATUS

• US 20090167623A1
• Filed: 03/05/2009
• Published: 07/02/2009
• Est. Priority Date: 05/26/2006
• Status: Active Grant

• Current Assignee: Toshiba Client Solutions CO., Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Sato, Koichi, Hotta, Hiroyuki, Amano, Takashi, TSUJIMURA, Akihiro
• Granted Patent: US 8,106,844 B2
• Time in Patent Office: Days
• US Class Current: 343/787
• 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 1/40 Radiating elements coated with or embedded in protective material
• CPC Class Codes: H01Q 19/13 the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination H01Q19/15 takes precedence
• CPC Class Codes: H01Q 19/30 the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

Abstract

A magnetic member is interposed and arranged between an antenna element and a printed circuit board, and an air member or a dielectric member is interposed between the antenna element and the magnetic member. The magnetic member is constituted of a nanogranular structure in which magnetic nanoparticles with ferromagnetism are three-dimensionally dispersed and arranged in an insulating matrix substrate.

Claims

1. An antenna apparatus which is set on a printed circuit board on which a metal surface to generate a ground potential and a signal line pattern to transmit a high-frequency signal are respectively formed, comprising:

an antenna element to which the ground potential is given from the metal surface and which includes a power feeding end, an open end and a middle portion therebetween; and

a magnetic member which is arranged between the antenna element and the printed circuit board in such a manner that the magnetic member is opposed to at least one of the power feeding end and the middle portion, wherein within said magnetic member a plurality of magnetic nanoparticles with ferromagnetism are dispersed and arranged in an insulating matrix substrate.

2. The antenna apparatus according to claim 1, wherein the magnetic member is opposed to both of the power feeding end and the middle portion.

3. The antenna apparatus according to claim 1, wherein the magnetic member is opposed to the power feeding end and a part of the middle portion, the part being close to the power feeding end.

4. The antenna apparatus according to claim 1, wherein the magnetic member is opposed to only the power feeding end.

5. The antenna apparatus according to claim 1, wherein the magnetic member is opposed to only the middle portion.

6. The antenna, apparatus according to claim 1, wherein the magnetic member is in a strip shape, and is opposed to only a limited part of the middle portion.

7. The antenna apparatus according to claim 1, wherein the magnetic member is opposed to only a limited part of the middle portion, the limited part being close to the power feeding end.

8. The antenna apparatus according to claim 1, further comprising:

a dielectric member arranged between the antenna element and the printed circuit board,

wherein the dielectric member is opposed to a part of the antenna element other than a part to which the magnetic member is opposed.

9. The antenna apparatus according to claim 8, wherein the dielectric member has a thickness equaling to a thickness of the magnetic member, and has a function structurally supporting the antenna element.

10. An antenna apparatus which is set on a printed circuit board on which a metal surface to generate a ground potential and a signal line pattern to transmit a high-frequency signal are respectively formed, comprising:

an antenna element to which the ground potential is given from the metal surface;

a magnetic member which is arranged between the antenna element and the printed circuit board, wherein within said magnetic;

member a plurality of magnetic nanoparticles with ferromagnetism are dispersed and arranged in an insulating matrix substrate; and

a first dielectric layer which is interposed and arranged between the antenna element and the magnetic member and which is formed of air or a dielectric member.

11. The antenna apparatus according to claim 10, further comprising a second dielectric layer which is interposed and arranged between the magnetic member and the printed circuit board and which is formed of air or a dielectric member.

12. The antenna apparatus according to claim 10, wherein the magnetic member is opposed to both of the power feeding end and the middle portion.

13. The antenna apparatus according to claim 10, wherein the magnetic member is opposed to the power feeding end and a part of the middle portion, the part being close to the power feeding end.

14. The antenna apparatus according to claim 10, wherein the magnetic member is opposed to only the power feeding end.

15. The antenna apparatus according to claim 10, wherein the magnetic member is opposed to only the middle portion.

16. The antenna apparatus according to claim 10, wherein the magnetic member is in a strip shape, and is opposed to only a limited part of the middle portion.

17. The antenna apparatus according to claim 10, wherein the magnetic member is opposed to only a limited part, of the middle portion, the limited part being close to the power feeding end.