在HFSS中建立微带线的三种拐角，直角拐角，外切45°拐角，圆弧拐角，分析三种情况下，不同情况对微带线的特性阻抗，衰减常数，相位常数的影响，并给出优化分析的结果。(In the HFSS, three kinds of corner, right angled corner, circumscribed 45 degree corner and circular arc angle are established. The influe