波导电路中用数值算法建模时源的研究

Study on excitation source in numerical calculation for waveguide circuits

将恰当的激励源引入到数值计算中对于正确地模拟电磁场问题是至关重要的。选择合适的激励源可以在尽量小的计算空间中 ,利用尽量少的计算时间得到波导电路的响应。为了尽量减少计算机内存占用 ,缩短计算时间 ,提高程序的计算效率 ,通常要求激励源的实现尽可能地紧凑 ,且与模场相匹配。本文给出了FDTD方法中常用的激励源 ,介绍了将激励源引入到FDTD计算中的方法 ,推导了波源的FDTD表达式。

It is very important to induct appropriate excitation source in numerical calculation for simulating exactly the problem of electromagnetic field, choosing appropriate excitation source in waveguide circuits show its significance by considerably saving computational domain and time. In order to save the memory requirement and the CPU time, improving the computational efficiency, excitation source should be compact by all means, and the excitation must match with the mode patterns. The paper provides some excitation sources in FDTD calculation,introducing the methods of inducting excitation source into FDTD and deriving the expressions of excitation sources in FDTD calculation.