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本文发展了一种对时域有限差分（ＦＤＴＤ）分析波导和微带电路简便有效的源激励法，并把它应用于各种微带电路，对于波导和微带不连续性问题，无需任何特殊处理，就可直接把吸收边界条件应用于端面；尤其对于微带电路，把Ｍｅｉ的简化场分布用作源面上的初始激励时，这种源激励法对源面及其附近不会引起源的任何失真。为演示这种技术的有效性和效率，给出了若干种不连续波导和微带结构的数值结果，并与解析解或常规的ＦＤＴＤ法得到的结果作了比较。
In this paper, a simple and effective source excitation method for FDTD analysis of waveguide and microstrip circuits has been developed and applied to a variety of microstrip circuits. There is no special requirement for waveguide and microstrip discontinuities , The absorption boundary condition can be directly applied to the end surface. Especially for the microstrip circuit, when Mei’s simplified field distribution is used as the initial excitation on the source surface, the source excitation method does not cause source to the source surface and its vicinity Any distortion. To demonstrate the effectiveness and efficiency of this technique, several numerical results of discontinuous waveguides and microstrip structures are given and compared with analytical solutions or the conventional FDTD method.