Hey @fima v
I believe you can use various MATLAB functions as 'sparameters','rationalfit' based on your data to achieve your goal.
You can extract your Touchstone S-Parameter file using 'sparameters' as below
% Read the S1P file
sobj = sparameters('model_txt.txt'); % It is preferred the file is in .s1p or compatible format.
freq = sobj.Frequencies; % Frequency vector (Hz)
s11 = rfparam(sobj,1,1); % S11 parameter (complex)
Then depending on your corcuit you may need to convert S11 to impedance or admittance.
Using 'rationalfit' you can fit a rational fucntion to your data to get Poles and Zeros. Then based on the formula metioned in the attached article you can write a simple code to calculate 'Ms1' and 'M11' with your extracted Zeros and Poles.
I have hereby attached the documentations of the functions mentioned for your reference:
I have also attached some examples and tutorials provided by MATLAB on this topic which might be relevant and help you achieve your goal.
I hope this helps to some extent!
