take in s-parameter file and plot tdr impedance in matlab

To take in an S-parameter file and plot TDR (time-domain reflectometry) impedance in Matlab, follow the steps below:

1. Load the S-parameter file using the sparameters function:

main.m
s_params = sparameters('path_to_file.s2p');
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2. Extract the reflection coefficient data from the S-parameters:

main.m
[frequency, s11] = s2rfreq(s_params.Parameters);
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3. Convert S11 to Z0 and impedance using TDR theory using the tline function:

main.m
Z0 = 50; % characteristic impedance of the transmission line in ohms
t = linspace(0,2/(max(frequency)*1e9),101);
z = tline(Z0, squeeze(s11), t, Z0);
Z = z.Z;
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4. Plot the TDR impedance vs. time:

main.m
plot(t*1e9, real(Z));
xlabel('Time (ns)');
ylabel('Impedance (\Omega)');
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This code will produce a plot of the TDR impedance vs time in units of ohms and nanoseconds.