圆图软件设计要求计算结果以图形和数据并行输出，处理包括复数的矩阵运算。为使程序代码简单，执行运算速度快，计算精度高，选择MATLAB 软件作为设计技术平台较为理想（也可利用VC,VB等）。该软件数学表示、函数集丰富且功能强大、良好的用户界面以及许多函数本身会绘制图形且自动选取坐标刻度等显著优点，特别适用大量计算。利用MATLAB强大的作图功能容易画出完整的Smith 圆图。整个圆图软件分为用户图形界面模块、圆图计算模块、画图演示模块。上述: 大模块又进一步分解，其中用户图形界面模块分为：主页、主菜单；圆图计算模块分为反射系数计算、单支节匹配计算、输入阻抗计算以及整个Smith圆图；画图演示模块分为等归一化电阻圆、等归一化电抗圆、反射系数圆等；确定阻抗值在圆图上的位置、圆图的基本应用、求输入阻抗及其在圆图上的位置以及单支节匹配等问题。-Chart software design requirements calculation results to graphics and data parallel output, processing include the plural matrix operation. In order to make the program code simple, implement the operation speed, high precision, select MATLAB software as design technology platform more ideal (also available VC and VB, etc.). The software mathematical representation, function set rich and powerful, good user interface and many function itself can graphing and auto select coordinate scale and other significant advantages, especially for a large number of calculation. Using MATLAB powerful mapping function easy to draw a complete Smith chart. The whole chart software is divided into user graphic interface module, calculation module chart, drawing demonstration module. The above: large module and further decomposition, of which the user graphic interface module can be divided into: the home page, the main menu, Circle diagram calculation module can be divided into reflection coefficient c