基于新时域算法的集总加载线天线的耦合分析

在电磁工程应用中, 天线通过加载, 可以缩短天线尺寸, 实现小型化设计.文中提出了网格内置集总元件的时域有限差分(Finite Difference Time Domain, FDTD)处理新方法, 将细导线FDTD与集总元件FDTD结合起来, 模拟了强电磁脉冲对集总加载线天线的耦合, 能够快速计算得到天线上耦合的电流响应.通过与有限积分法软件的仿真结果进行对比, 验证了混合算法的正确性.在此基础上, 分析了入射电磁脉冲的类型以及脉冲宽度对天线上电流响应的影响, 为天线进行前门防护设计提供理论依据.

Coupling analysis of lumped loaded linear antenna based on a novel time domain algorithm

In electromagnetic engineering, the size of antenna can be reduced by the method of adding load and thereby the miniaturization design of antenna is realized. In this paper, a novel finite difference time difference(FDTD) method with lumped elements in the grids is proposed, in which the fine wire FDTD and lumped element FDTD are integrated together. As an example, the coupling problem of the lumped loaded linear antenna excited by intensive electromagnetic pulse is simulated and it is observed that the current responses of the antenna can be rapidly obtained. Then the correctness of the hybrid method is verified by comparsion with the simulation results of electromagnetic software based on the finite integral method. Finally the influences of the types and widths of electromagnetic pulses on the current responses of the antenna are analyzed and the results greatly help the protection design of antenna.