Title:
ANTENNA DEVICE AND ITS DIRECTIONAL GAIN ADJUSTING METHOD
Document Type and Number:
WIPO Patent Application WO/2004/004070
Kind Code:
A1
Abstract:
An antenna device having an improved directional gain. The antenna device comprises an antenna having a bi-directional radiation pattern and a reflective plate adapted to reflect the radiation power in one direction of the antenna and superimpose the radiation power on the radiation power in another direction, provided with planar reflective surfaces with multiple steps provided on the side opposed to the antenna, and projecting toward the antenna. The reflective plate is rectangular, elliptic, or circular. The antenna device has an improved directional gain in a wide range, and the directional gain, that may sharply decline when a conventional planar reflective plate is used, does not decline.
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Inventors:
OSHIMA HIDEAKI (JP)
MATSUSHITA TATSUO (JP)
MATSUSHITA TATSUO (JP)
Application Number:
PCT/JP2003/007416
Publication Date:
January 08, 2004
Filing Date:
June 11, 2003
Export Citation:
Assignee:
NIPPON SHEET GLASS CO LTD (JP)
OSHIMA HIDEAKI (JP)
MATSUSHITA TATSUO (JP)
OSHIMA HIDEAKI (JP)
MATSUSHITA TATSUO (JP)
International Classes:
H01Q15/14; H01Q19/10; (IPC1-7): H01Q19/10; H01Q9/16; H01Q15/14
Foreign References:
| JP2003168912A | 2003-06-13 | |||
| JP2001257524A | 2001-09-21 | |||
| JP2002217636A | 2002-08-02 | |||
| JP2002271134A | 2002-09-20 |
Attorney, Agent or Firm:
Iwasa, Yoshiyuki c/o SUGIMURA INTERNATIONAL PATENT AND (TRADE MARK AGENCY BUREAU Kazan Building, 2-4,
Kasumigaseki 3 chome, Chiyoda-ku TOKYO, JP)
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