Magnitude data of S-parameters

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Anna
Anna 2015-2-12
评论： WIlliam Main 2017-8-13
I'm analyzing data from s-parameters using the rf toolbox and I was wondering if there is a simple command for extracting the magnitude data of the parameters without having to extract it from the rfplot handle?
BR, Anna

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Giorgia Zucchelli
Giorgia Zucchelli 2015-2-13
Hi Anna,
I think I would recommend the following approach:
S = sparameters('Data.s2p'); % read the touchstone file
s_param = S.Parameters; % extract the S-parameters from the data structure
% (for convenience)
f = S.Frequencies; % extract the frequency vector from the data structure
% (for convenience)
s_param_mag = abs(s_param); % compute the magnitude of the S-parameters
% this is a standard MATLAB function
plot(f, squeeze(s_param_mag(2,1,:))); % plot the S21 as a funtion of frequency
I hope that this helps, With best regards, Giorgia
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WIlliam Main
WIlliam Main 2017-8-13
I was expecting that if I convert s_param_mag to dB (i.e. log10(s_param_mag(2,1,frequency)*10 it would give the same value as I see in the plot generated by rfplot at frequency. But it does not, what am I missing? Thanks!

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Joe Wargo
Joe Wargo 2015-2-18
编辑：Joe Wargo 2015-2-18
Hi Anna,
Just to extend the good advice Giorgia gave, if you want to look at just one of the Sij parameters (s21, for instance) you can use the rfparam() function:
S = sparameters('Data.s2p'); % Read the touchstone file
s21 = rfparam(S,2,1); % Extract the s21 data
s21_mag = abs(s21);
s21_db = 20*log10(s21_mag);
I hope that helps!
Joe

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