Based on the radio waves propagation models of circular tunnels and rectangular tunnels, the relation between attenuation and conductivity is analyzed and the concept of conductivity breakpoint is presented.
Based on the radio waves propagation models of circular tunnels and rectangular tunnels, the relation between attenuation and conductivity is analyzed and the concept of conductivity breakpoint is presented.
根据圆形巷道和矩形巷道的电波传播模型，分析了电波衰减率和电导率的关系，并且提出了电导率断点的概念。