CST的离散端口计算S参数，每次修改端口阻抗，都需要重新计算，但是事实上输入阻抗是不变的，所以可以从CST中导出输入阻抗，在matlab中计算不同端口阻抗的S参数。(The discrete port of CST calculates the S parameters, and each time the port impedance is modified, it needs to be recalculated. But in fact, the input impedance is constant, so the input impedance can be derived from CST, and the S parameters of different port impedance can be calculated in MATLAB.)