The characteristic impedance of unscreened slab-line is obtained, based on the investigation of the properties of the equipotentialline in vertical stripline.
本文通过保角变换研究了垂直带状线中等位线的特性，结果表明其中有一根非常近似于圆的等位线。
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This software package can calculate electric field in different stress cone shape by finite element method, and can present following functions: drawing equipotentialline;