Z11 = (1+S11)/(1-S11S22-S12S21) Z12 = 2S12/(1-S11S22-S12S21) Z21 = 2S21/(1-S11S22-S12S21) Z22 = (1+S22)/(1-S11S22-S12S21)转化为matlab语言

以下是将S参数转换为Z参数的 MATLAB 代码：

function Z = S2Z(S)
%S2Z Convert S-parameters to Z-parameters
%   Z = S2Z(S) converts the scattering parameters S to impedance parameters Z
%   using the following formula:
%   
%   Z11 = (1+S11)/(1-S11*S22-S12*S21)
%   Z12 = 2*S12/(1-S11*S22-S12*S21)
%   Z21 = 2*S21/(1-S11*S22-S12*S21)
%   Z22 = (1+S22)/(1-S11*S22-S12*S21)
%
%   Inputs:
%       S - a 2x2 matrix of scattering parameters
%
%   Outputs:
%       Z - a 2x2 matrix of impedance parameters

Z(1,1) = (1+S(1,1))/(1-S(1,1)*S(2,2)-S(1,2)*S(2,1));
Z(1,2) = 2*S(1,2)/(1-S(1,1)*S(2,2)-S(1,2)*S(2,1));
Z(2,1) = 2*S(2,1)/(1-S(1,1)*S(2,2)-S(1,2)*S(2,1));
Z(2,2) = (1+S(2,2))/(1-S(1,1)*S(2,2)-S(1,2)*S(2,1));

end

使用方法：

%S参数
S = [0.5 0.3; 0.2 0.7];

%将S参数转换为Z参数
Z = S2Z(S);

%输出Z参数
disp(Z);