Title:
ANTENNA AND COMMUNICATION DEVICE WITH THAT ANTENNA
Document Type and Number:
WIPO Patent Application WO/2008/072411
Kind Code:
A1
Abstract:
A planar radiation element (2) is arranged on the ground surface (5) while spaced
apart therefrom. The radiation element (2) resonates at predetermined low
level wavelength λ1 and high level wavelength λ2.
On the periphery of the radiation element (2), a feeding portion (3) to be connected
with a feeding circuit and a pair of short circuit portions (7, 8) are provided.
The feeding portion (3) is provided on one end side of the radiation element (2).
The pair of short circuit portions (7, 8) are provided in the regions that are
on the opposite sides along the circumferential edge direction of the radiation
element (2) from the feeding portion (3) and give portions where the voltages
of high level resonance respectively delivered from the feeding portion (3)
to the short circuit portions (7, 8) become zero. The short circuit portions
(7, 8) are extended to the ground surface (5) side and connected therewith. The
radiation element (2) has an open end (6) on the other side, i.e. the side opposite
to the feeding portion (3). Electric length of the radiation element (2) from
one end side to the other end side (6) thereof is formed to be one half of the high
level resonance wavelength λ2 of the radiation element (2).
Inventors:
UEKI NORIYUKI (JP)
Application Number:
PCT/JP2007/069374
Publication Date:
June 19, 2008
Filing Date:
October 03, 2007
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
UEKI NORIYUKI (JP)
UEKI NORIYUKI (JP)
International Classes:
H01Q5/00; H01Q13/08; H01Q5/10; H01Q5/357; H01Q7/00; H01Q9/30
Foreign References:
| JP2004312628A | 2004-11-04 | |||
| JP2004312166A | 2004-11-04 | |||
| JP2004096572A | 2004-03-25 | |||
| JP3235367B2 | 2001-12-04 | |||
| JPH03253106A | 1991-11-12 | |||
| JPH11234030A | 1999-08-27 | |||
| JPH10107535A | 1998-04-24 | |||
| JP2000183637A | 2000-06-30 | |||
| JP3237604B2 | 2001-12-10 | |||
| JP2002314325A | 2002-10-25 | |||
| JP2002057523A | 2002-02-22 | |||
| JP2001024426A | 2001-01-26 | |||
| JP2002530908A | 2002-09-17 | |||
| US20040196200A1 | 2004-10-07 |
Attorney, Agent or Firm:
IGARASHI, Kiyoshi (Yokohamahigashiguchi Bldg. 10-13, Takashima 2-chome, Nishi-ku, Yokohama-sh, Kanagawa 11, JP)
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