FDTD中波导激励源研究

Study of Excitation Source in Waveguide Using FDTD Method

:FDTD已广泛应用于波导问题的计算 ,本文首先讨论Gaussian脉冲在波导中传输时的波形变化情况 ,然后根据波导的色散特性 ,提出一种调制的脉冲波作为波导入射波的激励源 ,给出了脉冲宽度与调制频率的计算公式 ;讨论在脉冲激励的条件下入射场的计算方法 ,总场 /反射场的连接方法 ;

The finite difference time domain method (FDTD) is used to simulate propagation of Gaussian pulse in waveguide According to the dispersive characteristics of waveguide, a new modulate pulse is presented for excitation source of waveguide, and the formulations of pulse width T and modulate frequency are also given Applications of the technique are presented, and the numerical results are compared with experimental results, and the comparison shows excellent agreement over a wide frequency band