摘要
采用基于介质波导理论的多波模模型,推导巷道中天线的耦合效率和方向函数。以水平极化半波偶极子天线为例,进行仿真分析,得出结论:天线在巷道截面中心最有利于波模的激励,天线耦合效率最大,且传输衰减率最小;除截面中心区域,天线在巷道截面横向对称轴的位置,如巷道侧壁中心,也较易激励波模,可有效激励70%以上的波模,天线耦合效率较大,传输衰减率也相对较小;当天线靠近巷道截面拐角时,最不利于波模的激励,只能有效激励30%左右的波模,天线耦合效率最小,传输衰减率最大,但此时天线的辐射方向性最强,信号起伏最为平缓。
Multimode model based on the modal theory was utilized to deduce the coupling efficiency and directivity function of the antenna in coal mine tunnels. Take a horizontally polarized half wave dipole antenna as an example, the related simulations and analysis show that when the antenna is located in the middle of the tunnel, the modes are the most easily to be excited, and the coupling efficiency is the largest, and the decay rate is the lowest. In addition to the middle position, when the antenna is located on the horizontal axis of symmetry, such as the right middle of the tunnel cross section, the modes are also easier to be excited. Up to 70% of the modes can be effectively exited. And the decay rate is also lower. However, when the antenna is close to the comers of the tunnel cross section, the modes are the most difficultly to be excited. Only about 30% of the modes can be effectively excited. Meanwhile, the coupling efficiency is the lowest, and the decay rate reaches to the maximum. But the directivity of the antenna radiation is the strongest. The fluctuation of the signal attenuation is the flattest.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2013年第4期715-720,共6页
Journal of China Coal Society
基金
国家科技支撑计划资助项目(2012BAH12B00)
中央高校基本科研业务费专项资金资助项目(2012LWB75)
关键词
无线通信
井下巷道
天线位置
辐射场分布
wireless communication
mine tunnel
antenna location
radiation field distribution
