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本文利用直线法结合周期边界条件,分析了双层多导体微带传输线的色散特性,与直线法结合吸收边界条件的常规方法相比,本文的做法可得到具有解析形式的特征值与特征矢,并且能够利用快速付里叶变换来计算阻抗元素,从而大大提高计算效率.计算实例证明了方法的正确性和有效性.最后给出了几种不同结构微带传输线的色散特性.
In this paper, the dispersion characteristics of the double-layer multi-conductor microstrip transmission line are analyzed by the combination of the straight line method and the periodic boundary condition. Compared with the conventional method which combines the absorption boundary conditions by the straight line method, the eigenvalues and eigenvectors of the analytical solution can be obtained. And the fast Fourier transform can be used to calculate the impedance element, which can greatly improve the computational efficiency.The calculation example proves the correctness and validity of the method.Finally, the dispersion characteristics of several microstrip transmission lines with different structures are given.