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本文提出用保角变换边界元组合法计算各种结构的未屏蔽平板线特性阻抗问题．保角变换将未屏蔽平板线的无穷边界无界场城边值问题变换为有界场域边值问题，再利用具有诸多优点的边界元法进行求解．通过对各种结构的未屏蔽平板线的实例计算结果表明：组合法不仅具有较高的计算精度，而且可以很方便地应用于传输线工程问题的设计与计算．
In this paper, the conformal transformation boundary element method is used to calculate the characteristic impedance of unshielded plate lines of various structures. Conformal mapping transforms the boundaryless boundary city boundary value problem of unscreened slab line into the boundary value boundary problem of boundary field, and then uses the boundary element method with many advantages to solve it. The calculation results of the unshielded slab wires with various structures show that the combination method not only has high computational accuracy, but also can be easily applied to the design and calculation of transmission line engineering problems.