摘要
在计算矩形波导的S参数时 ,一些基于FDTD方法的电磁场数值仿真软件只提供了激励点的S参数。在实际应用中 ,针对波导往往要求计算截面间的S参数 ,这使得不能直接利用该软件给出的结果。该文利用FDTD软件输出的稳态场分布 ,通过计算坡印廷矢量提取波导的S参数。通过比较不同计算时间步、空间步长、负载、吸收边界等对本提取方法的影响 ,验证了基于坡印廷矢量计算波导S参数的方法 ,并对一个实例进行了计算。本方法也可用于圆波导。
Some electromagnetic simulation softwares based on Finite-Difference Time-Domain (FDTD) method provide only S-parameters at the feed ports. Usually, it is hard to achieve S-parameters of a waveguide system directly from that kind of simulation software. A method for computing Poynting vector from the steady-state data saved by the software to obtain S-parameters is presented in this paper. Meanwhile, numerical errors are analyzed with different simulation conditions as time steps, grid sizes, loads and absorbing boundary conditions. It shows that the method is valid and practical. Water partially filled waveguide is commutated as an example by this method. Moreover, the method can be applied to calculating S-parameters of other microwave components, such as circular waveguide, coaxial line and so on.
出处
《计算机仿真》
CSCD
2005年第1期80-83,共4页
Computer Simulation
基金
NSFC资助项目 ( 60 3 0 10 0 4)
