圆形隧道中泄漏同轴电缆辐射场的FDTD 分析

随着泄漏同轴电缆在各种闭域空间中的应用越来越广泛，其精确的辐射特性数值解也引起人们的关注。在圆柱坐标系下，根据泄漏同轴电缆的辐射理论，分析了圆形隧道中电磁波的传播途径，用时域有限差分（FDTD）方法求解了泄漏同轴电缆在圆形隧道中的辐射场。该方法相比于解析法，简化了计算程序，提高了结果的精确度，并且易于实现。仿真结果表明在圆形隧道中，泄漏同轴电缆不存在传统天线所具有的通信盲区的缺点，可以实现与外部空间的全方位双工通信。

Analysis on Radiation Field of Leaky Coaxial Cable inRound Tunnel with FDTD

The application of leaky coaxial cable is becoming more and more widely, and the numerical radiationcharacteristics are paid more and more attention. In the cylindrical coordinate, the propagation path of electromagnetic wavein round tunnel is analyzes based on the radiation theory of leaky coaxial cable, and the radiation field of leaky coaxial cablein round tunnel is simulated by using finite difference time domain(FDTD) and ray tracing method. The process ofcalculation is more concise, and the results are more accurate. The results show that the leaky coaxial cable can cover theshortages of traditional antennas in blind or semi-blind zone, and the duplex communication between inside and outside ofthe tunnel can be realized easily.