期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
无线通信台防雷电“三要”
1
作者 林宝权 《现代通信》 2004年第8期40-41,共2页
无线通信台防雷电很重要。在无线通信台安装时必须做到“三要”。
关键词 无线通信台 防雷电 电涌保护器 避雷针 接地
原文传递
当前测绘城市大比例尺地形图的特点
2
作者 朱公琦 王晓东 《河南测绘》 2003年第2期9-10,23,共3页
关键词 城市大比例尺地形图 测绘 地上管线 地下管线 无线通信台 高层建筑 城市商业建筑面积
下载PDF
Compensation Method: New Perspectives
3
作者 Boris Levin 《Journal of Physical Science and Application》 2014年第2期119-129,共11页
The compensation method aiming to reduce the irradiation on the user's body and to form a weak field area (a dark spot) in an antenna near region is considered. The results of the method development for the use in ... The compensation method aiming to reduce the irradiation on the user's body and to form a weak field area (a dark spot) in an antenna near region is considered. The results of the method development for the use in a narrow frequencies range are given. They show that under realistic conditions the compensation method allows reducing the irradiation power by a factor of 3-4 and more. The pattern changes are predictable and small, if the points of antennas placement are selected correctly. The dark spot necessity near the transmitter is not limited by mobile communication. A man often uses a low-power radio station, which is placed nearby in a vehicle, and it is necessary to protect from irradiation not only user but also other passengers. In the paper, it is shown that broadband field compensation can be achieved in various structures where the needed anti-phase fields are created either by identical antennas or by radiators located at equal distance from the compensation point, or by flat reflectors. 展开更多
关键词 Antenna theory COMPENSATION mobile antennas mutual coupling near fields
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部