Ploting s-parameters of inductors in Matlab?

[Meklaud]

I have done a code for modeling a square-shaped inductor in Matlab(it has been done using a possibility of interaction between Matlab and FEMLAB),and now I would like to make a plot for s-parameters of inductor because I need them for calculating Q-factor and selfinductance.

How to do this?

 

[brmadhukar]

You need to have S params as a function of frequency and then you do a polar plot.
Is your question: How to model the params using matlab?

brmadhukar

 

[Meklaud]

I do have a S(f) calculated and now I made a x-y coordinate system using this code
subplot(2,2,1);
semilogx(f,real(S11));
xlabel('Frequency');
ylabel('Real(S11)');
title('Real(S11) = Real(S22)');
grid;

As a figure I get empty drawing so i'm interested how to plot the line for the S that i have calculated.What is the command to plot the curve S(f)?

 

[Meklaud]

Problem is that I get plots,but they are empty plots ,I have no function ploted and that's what bothers me.
Did i make some mistake?

 

[eirp]

Problem is that I get plots,but they are empty plots ,I have no function ploted and that's what bothers me.
Did i make some mistake?

Can't tell more until you post your s-parameters file here.
Are you really ploting only magnitude?

Also you may try function "smithchart" from RF toolbox