史密斯图(Smith chart)是一款用于电机与电子工程学的图表，主要用于传输线的阻抗匹配上。在复平面上采用双线性变换。实部 r=常数和虚部 x=常数，两族正交直线变化为正交圆并与反射系数|G|=常数和虚部x=常数套用而成。本文档通过MATLAB来编写程序，绘制一个完整的SMITH圆图-Smith figure (Smith chart) is a for electrical and electronic engineering chart, mainly for the transmission line on the impedance matching in the plane bilinear transformation real part r = constant and imaginary part x = constant, two RACES straight for orthogonal round orthogonal changes and and reflection coefficient | G | = constant and imaginary part x = constant apply mechanically and into this document to write the program through MATLAB, draw a complete Smith circle diagram