【摘 要】
：
用二维时域有限差分法（２Ｄ－ＦＤＴＤ）计算波导截止频率时，激励源必须与模场匹配．本文以矩形波导为例，分析了面源、线源和点源的激励作用，给出了２Ｄ－ＦＤＴＤ法计算波导截止频率的激励源的设计方法，此法可在一
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用二维时域有限差分法（２Ｄ－ＦＤＴＤ）计算波导截止频率时，激励源必须与模场匹配．本文以矩形波导为例，分析了面源、线源和点源的激励作用，给出了２Ｄ－ＦＤＴＤ法计算波导截止频率的激励源的设计方法，此法可在一次计算中给出所有低阶模的截止频率．
When calculating the cutoff frequency of a waveguide using 2D FDTD, the excitation source must match the mode field. In this paper, rectangular waveguide is taken as an example, the excitation of surface source, line source and point source are analyzed. The design method of 2D-FDTD excitation source for calculating the cutoff frequency of waveguide is given. This method can give all the low Cutoff frequency of order mode.
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