Magnitude data of S-parameters

64 次查看（过去 30 天）
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

请先登录，再回答此问题。

采纳的回答

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
  1 个评论
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!

请先登录，再进行评论。

更多回答（1 个）

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

类别

在 Help Center 和 File Exchange 中查找有关 Visualization and Data Export 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by