Title:
ANTENNA DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/095638
Kind Code:
A1
Abstract:
An antenna device (10) is composed of a radio wave resonance section (12) of an antenna and a non-earthed, a conductive cover (20) so installed as to extend over the region where the transmission/reception radio wave from/by the radio wave resonance section (12) passes. There is an insulation gap between the two constituent parts. When, for example, a discone antenna is used as the radio wave resonance section (12), the S/N ratio can be improved in a wide bandwidth. An antenna device having an improved S/N ratio is provided by a different radio-wave communication technology from the conventional one such as installation of a screen.
Inventors:
HAGIWARA YOSHIHIRO (JP)
SHIMIZU KOSAKU (JP)
KATO KATSUMI (JP)
SAKUMA YUICHI (JP)
HAGIWARA IPPEI (JP)
KOBAYASHI KENJI (JP)
SHIMIZU KOSAKU (JP)
KATO KATSUMI (JP)
SAKUMA YUICHI (JP)
HAGIWARA IPPEI (JP)
KOBAYASHI KENJI (JP)
Application Number:
PCT/JP2004/005693
Publication Date:
November 04, 2004
Filing Date:
April 21, 2004
Export Citation:
Assignee:
COCOMO MB COMMUNICATIONS INC (JP)
HAGIWARA YOSHIHIRO (JP)
SHIMIZU KOSAKU (JP)
KATO KATSUMI (JP)
SAKUMA YUICHI (JP)
HAGIWARA IPPEI (JP)
KOBAYASHI KENJI (JP)
HAGIWARA YOSHIHIRO (JP)
SHIMIZU KOSAKU (JP)
KATO KATSUMI (JP)
SAKUMA YUICHI (JP)
HAGIWARA IPPEI (JP)
KOBAYASHI KENJI (JP)
International Classes:
H01Q9/30; H01Q9/36; (IPC1-7): H01Q9/30; H01Q9/36
Foreign References:
| JPH08107307A | 1996-04-23 | |||
| JPH0239701A | 1990-02-08 | |||
| JPH0969723A | 1997-03-11 |
Attorney, Agent or Firm:
Hayashi, Keisuke (5-24-2 Kamat, Ota-ku Tokyo, JP)
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