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将区域分解法（ＤＤＭ）应用于电磁场问题分析，计算了准ＴＥＭ传输线的特性阻抗，并通过数值试验研究了区域分解法的收敛性及计算效率。利用区域分解法的优越性，在划分的几个规则子区域上引入ＦＦＴ快速算法，分析了矩形同轴线的特性阻抗。数值结果表明，区域分解法降低了计算复杂性、减小了计算规模，且提高了计算效率。
The area decomposition method (DDM) is applied to the electromagnetic field problem analysis, the characteristic impedance of the quasi-TEM transmission line is calculated, and the convergence and calculation efficiency of the area decomposition method are studied by numerical experiments. By using the superiority of the regional decomposition method, FFT fast algorithm is introduced into several regular subareas, and the characteristic impedance of the rectangular coaxial line is analyzed. Numerical results show that the regional decomposition method reduces the computational complexity, reduces the computational scale, and improves the computational efficiency.