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基于区域分裂的思想，通过引入一虚拟圆形边界，将开放微波传输线的整个无界区域划分为圆内和圆外两部分。圆内有限区域采用通常的有限元法离散，而将整个圆外无限区域看作一个“无限大”单元，采用以本征函数展开的Ｆｏｕｒｉｅｒ级数作为插值函数的离散方法。这种处理方法不仅保留了有限元法非常适合于含有复杂介质和任意柱（带）状导体的特点，同时也能很好地把有限元方法的求解区域推广至无穷远，从而形成了一种提取开放微波传输线电磁参数的快速算法：有限元－本征函数展开结合法。文中对几种（耦合）微带线的实例计算表明，该方法精度高、速度快、简单易行并且对结构的适应性强
Based on the idea of regional split, the entire unbounded region of the open microwave transmission line is divided into two parts: the inner circle and the outer circle by introducing a virtual circular boundary. The finite region in the circle is discretized by using the usual finite element method, and the infinite region outside the circle is treated as an “infinite unit”. The Fourier series expanded by eigenfunction is used as the discrete function of the interpolation function. This method not only retains the finite element method is very suitable for containing complex media and any column (conductor) with the characteristics of the conductor, but also can well solve the finite element method to generalize the region to infinity, thus forming a Fast Algorithm for Extracting Electromagnetic Parameters of Open Microwave Transmission Line: Finite Element - Eigenfunction Expansion Combination Method. The calculation of several kinds of (coupling) microstrip lines in this paper shows that this method is accurate, fast, easy and adaptable to the structure