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How can we calculate/plot z and y parameters given an S2p file for a particular set of measured data?

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Mena Maurice
Mena Maurice 2022-2-22
回答： SANKALP DEV 2023-9-14
Hello,
I have been trying to use the existing function build in matlab that computes S parameters into corresponding Z and Y parameters
However, I am not able to store plot each parameter versus frequency seperately since they are stored generically through the command
Y=yparameters(filename.s2p)
Z=zparameters(filename.s2p)
I would greatly appreciate it as I am new on using such functions on matlab.
Thanks
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Mena Maurice
Mena Maurice 2022-2-22
y =
yparameters: Y-parameters object
NumPorts: 2
Frequencies: [79×1 double]
Parameters: [2×2×79 double]
rfparam(obj,i,j) returns Y-parameter Yij
for instance here is the data stored however, how can we extract it for plotting as well as obtain the magnitude and phasor quantites of each parameter
Thanks

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回答（1 个）

SANKALP DEV
SANKALP DEV 2023-9-14
Hey Mena,
I understand that you are currently working on the task of extracting and plotting the magnitude and phase from a Y-parameters object.
Since you have already accessed the Y-parameters object, I'd like to guide you through the necessary steps to accomplish your goals.
Please refer to steps given below:
  • Extract the frequencies and parameters using dot notations as shown below.
freq = Y.Frequencies;
para = Y.Parameters;
  • Extract the individual Y-parameters, using ‘rfparam’
Y11 = rfparam(Y, 1, 1);
Y12 = rfparam(Y, 1, 2);
Y21 = rfparam(Y, 2, 1);
Y22 = rfparam(Y, 2, 2);
  • Calculate the magnitude and phase of each Y-parameter as follows.
mag_Y11 = abs(Y11);
phase_Y11 = angle(Y11);
  • Finally, use the plot function to plot phase and magnitude.
For more information about the functions used above, please refer to following MATLAB documentations:
Hope it helps.

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