ANTENNA APPARATUS AND RADIO TERMINAL APPARATUS

• US 20110207422A1
• Filed: 02/03/2011
• Published: 08/25/2011
• Est. Priority Date: 02/24/2010
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yamagajo, Takashi, Ban, Yasumitsu
• Application Number:
  US13/020,175
• Publication Number:
  US 20110207422A1
• Time in Patent Office: Days
• US Class Current: 455/128
• CPC Class Codes: H01Q 1/2275 associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 1/52 Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure absorbing means H01Q17/00
• CPC Class Codes: H01Q 5/335 at the feed, e.g. for impedance matching
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna apparatus, including: a substrate; an antenna element which is arranged on the substrate and transmits or receives a radio signal; a feed point which is connected to the antenna element and feeds a current or a voltage to the antenna element; and a wiring pattern, one end of which is connected to a ground pattern formed on a portion of the substrate, wherein two or more sets of the antenna element, the feed point, and the wiring pattern is included if the antenna element, the feed point, and the wiring pattern form one set.

Claims

1. An antenna apparatus, comprising:

a substrate;

an antenna element which is arranged on the substrate and transmits or receives a radio signal;

a feed point which is connected to the antenna element and feeds a current or a voltage to the antenna element; and

a wiring pattern, one end of which is connected to a ground pattern formed on a portion of the substrate,

wherein two or more sets of the antenna element, the feed point, and the wiring pattern is included if the antenna element, the feed point, and the wiring pattern form one set.

2. The antenna apparatus according to claim 1, wherein a portion of the wiring pattern is formed as a meander line.

3. The antenna apparatus according to claim 2, wherein a distance between the meander line which is closest to the antenna element among portions of the meander line, and the antenna element is equal to or less than a threshold value.

4. The antenna apparatus according to claim 1, wherein the ground pattern includes a slit.

5. The antenna apparatus according to claim 2, wherein all of lengths of portions of the meander line in a long-side direction are the same.

6. The antenna apparatus according to claim 2, wherein lengths of portions of the meander line in a long-side direction increase in accordance with increasing distance from the antenna element.

7. The antenna apparatus according to claim 2, wherein a length in a long-side direction of a first meander line which is closest to the antenna element among potions of the meander line is longer than a length in the long-side direction of a second meander line which is shortest among the potions of the meander line, and lengths in the long-side direction of the portions of the meander line other than the first and second meander lines increase in accordance with increasing distance from the antenna element.

8. The antenna apparatus according to claim 1, wherein the number of wiring patterns connected to the ground pattern in each of the sets is one or more.

9. The antenna apparatus according to claim 1, wherein

the antenna element includes a fixed unit fixed to the antenna apparatus and a bent unit bent in an L-shape, and

the bent unit is rotatable about the fixed unit and is accommodated within a width of the antenna apparatus by rotation of the bent unit.

10. The antenna apparatus according to claim 1, wherein the wiring pattern is arranged within the same plane as the ground pattern.

11. The antenna apparatus according to claim 1, wherein the wiring pattern is arranged within a plane which is perpendicular to the ground pattern.

12. The antenna apparatus according to claim 1, wherein the wiring pattern is formed by a conductive metal flat plane.

13. The antenna apparatus according to claim 1, wherein the wiring pattern is a stub.

14. The antenna apparatus according to claim 1, wherein the ground pattern is formed by a conductive metal flat plane.

15. The antenna apparatus according to claim 2, wherein lengths of portions of the meander line in a long-side direction decrease in accordance with increasing distance from the antenna element.

16. The antenna apparatus according to claim 2, wherein among portions of the meander line, a length of a third meander line in a long-side direction is longer than lengths of other portions of the meander line in the long-side direction, the third meander line being disposed between a first meander line which is closest to the antenna element and a second meander line which is farthest from the antenna element.

17. A radio terminal apparatus for transmitting or receiving a radio signal, comprising:

a housing; and

an antenna apparatus accommodated in the housing,

wherein

the antenna apparatus includes a substrate, an antenna element which is arranged on the substrate and transmits or receives the radio signal, a feed point which is connected to the antenna element and feeds a current or a voltage to the antenna element, and a wiring pattern one end of which is connected to a ground pattern formed on a portion of the substrate, and

two or more sets of the antenna element, the feed point, and the wiring pattern is included if the antenna element, the feed point, and the wiring pattern form one set.