Document Type and Number:
Japanese Patent JP4322723
Kind Code:
B2
Abstract:
To control a directivity control device in response to environmental characteristics such as density of high-rise buildings.
The directivity control device 106 switches or synthesizes received signals by two antennas A1 and A2 with a switch 110 or a synthesizer 120. The elevation angle of the antennas A1 and A2 are directly switched by elevation angle switching devices A1C and A2C separately. When a ratio of height H of a building to road width W is larger than a first threshold Hth1and a position of transmitting point is in the right or left region, a directivity of the directive antenna 1 is controlled to have a high elevation angle to be perpendicular to the road leftward or rightward. In other cases, the directivity is a low elevation angle and is horizontally changed by electric wave's arrival angle. In suburbs, the directivity is controlled to be a low elevation angle in the direction of transmitting point.
COPYRIGHT: (C)2006,JPO&NCIPI
Inventors:
Harada intellectual education
Kenji Ito
Toshiaki Watanabe
Hidetsugu Shibata
Tokusho Suzuki
Nishikawa Kunri
Junzo Oe
Toshio Kono
Hiroki Okada
Satoshi Sugimoto
Application Number:
JP2004101396A
Publication Date:
September 02, 2009
Filing Date:
March 30, 2004
Assignee:
Toyota Central R & D Labs.
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
H01Q3/24; H01Q3/26; H04B7/10; H04B7/26; H04W16/28
Domestic Patent References:
| JP2003198441A | | | | |
| JP2268528A | | | | |
| JP3220825A | | | | |
| JP8223142A | | | | |
| JP2002152114A | | | | |
Other References:
浅野孔一 他4名,市街地における電波到来方向分布の推定,電子情報通信学会技術研究報告,日本,電子情報通信学会,1989年 1月20日,RCS88-52,41-46
Attorney, Agent or Firm:
Osamu Fujitani
