Convert a table of S param to Z param

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Venkatkumar M
Venkatkumar M 2022 年 1 月 17 日
コメント済み: William Rose 2022 年 1 月 21 日
I have text file which has freq and s21 value(In cartesian form and polar form ).
Need a help in convertering those S-paramteres to Z- parameters
I tried to use s2z command, but i doesn't work in this.
Could any one please help me resolve the problem?


William Rose
William Rose 2022 年 1 月 17 日
How do you know s2z does not work? Do you get an error message, and if so, what?
The input to s2z must be complex numbers, in the form Re + i*Im. The file you provided has a header line and three columns: frequency, real part, imaginary part. It uses two different separators: tab and comma. That is annoying because it complicates the reading in of the data.
I assume that the data is in real, imaginary format. Change it to complex:
Then use s2z.
  9 件のコメント
Venkatkumar M
Venkatkumar M 2022 年 1 月 21 日
I am getting error in function renamevars
Undefined function 'renamevars' for input arguments of type 'table'.
Error in s_parm_db_to_z_param_1 (line 7)
T = renamevars(T,["Var1","Var2","Var3"],["freq","magdB","phase"]);
could you please clarify this?
William Rose
William Rose 2022 年 1 月 21 日
@Venkatkumar M, I don;t know why you get an error. The error message suggests Matlab is not finding the function renamevars(). renamevars is art of basic Matlab - nt some Toolbox. Therefore it should work.
Did renamevars get overwritten by accident? Try "clear renamevars" to address this possibility, then try your code again.


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