FDTD软件中S参数提取方法的讨论与分析

Methods to Calculate S-parameters at Any Port of Waveguide Using the Calculated Electric Fields Based on FDTD Software

摘要:

利用基于时域有限差分(FDTD)的电磁场数值仿真软件,如XFDTD等对传输线、天线等结构进行仿真计算时,只能提取激励点的S参数,而在实际应用中,需要提取传输线等结构任意截面的S参数。针对该问题,本文采用坡印亭矢量和驻波比两种方法,通过XFDTD软件输出的稳态场分布获得S参数,并与传输线理论计算所得S参数进行比较,验证了这两种方法的可行性。

Abstract:

Electromagnetic simulation software,such as XFDTD,based on Finite Difference Time Domain (FDTD) method,provides only S-parameters at the feed ports.Usually,it is hard to achieve S-parameters of a transmission line system directly from the software.In this