hikatko said:Read some of those papers? The fourth from the top, the Robust one by Chen et al, is one of the best. Begin with that and actually read the references listed in it. This is pretty well-understood and straightforward.
This is a great list, but don't forget about the field averaging method!
I wrote this codeplz upload ur code
clc
% extracted values of frequency %
f=[30.0 , 30.625, 31.25, 31.875,32.500,33.125,33.750,34.375,35.000,35.625,36.2500,36.8750,37.5000,38.1250,38.750,39.3750,40.0000,40.6250,41.2500,41.8750,42.5000,43.12500,43.75000,44.37500,45.00000,45.6250,46.2500,46.8750,47.5000,48.1250,48.7500,49.3750,50.0000]
% s11 parameter %
s11=[-1.56 ,-1.80 ,-2.05,-2.33,-2.6504,-3.0252,-3.4710,-4.0084,-4.6659,-5.4769,-6.4890,-7.7728,-9.434,-11.6765,-14.7990,-19.919,-33.7676,-24.888,-17.720,-14.089,-11.767,-10.1313,-8.92165,-8.00691,-7.3044,-6.766008,-6.3570,-6.05145,-5.83227,-5.6948,-5.6225,-5.6197,-5.6727]
%extracted s21 parameter from simulation%
s21=[-5.19,-4.70,-4.25,-3.82,-3.411,-3.003,-2.601,-2.207,-1.822,-1.454,-1.110,-0.8003,-0.5318,-0.3126,-0.1526,-0.0508,-0.0078,-0.0208,-0.08314,-0.17887,-0.30498,-0.44897,-0.60147,-0.75405,-0.8998,-1.0334,-1.1489,-1.2454,-1.3220,-1.3707,-1.3972,-1.3981,-1.3782]
% formula from IEEE paper %
n=(acos((1./(2.*s21)).*(1-(s11).^2-(s21).^2)))./1.6; % Index %
z=sqrt(((1+s11).^2)-(s21).^2)./(((1-s11).^2)-(s21).^2); % Impedence %
plot(f, real(n), 'blue', f, imag(n), 'r');
title('index');
I wrote this code
Is that right?
clc
% extracted values of frequency %
f=[30.0 , 30.625, 31.25, 31.875,32.500,33.125,33.750,34.375,35.000,35.625,36.2500,36.8750,37.5000,38.1250,38.750,39.3750,40.0000,40.6250,41.2500,41.8750,42.5000,43.12500,43.75000,44.37500,45.00000,45.6250,46.2500,46.8750,47.5000,48.1250,48.7500,49.3750,50.0000]
% s11 parameter %
s11=[-1.56 ,-1.80 ,-2.05,-2.33,-2.6504,-3.0252,-3.4710,-4.0084,-4.6659,-5.4769,-6.4890,-7.7728,-9.434,-11.6765,-14.7990,-19.919,-33.7676,-24.888,-17.720,-14.089,-11.767,-10.1313,-8.92165,-8.00691,-7.3044,-6.766008,-6.3570,-6.05145,-5.83227,-5.6948,-5.6225,-5.6197,-5.6727]
%extracted s21 parameter from simulation%
s21=[-5.19,-4.70,-4.25,-3.82,-3.411,-3.003,-2.601,-2.207,-1.822,-1.454,-1.110,-0.8003,-0.5318,-0.3126,-0.1526,-0.0508,-0.0078,-0.0208,-0.08314,-0.17887,-0.30498,-0.44897,-0.60147,-0.75405,-0.8998,-1.0334,-1.1489,-1.2454,-1.3220,-1.3707,-1.3972,-1.3981,-1.3782]
% formula from IEEE paper %
n=(acos((1./(2.*s21)).*(1-(s11).^2-(s21).^2)))./1.6; % Index %
z=sqrt(((1+s11).^2)-(s21).^2)./(((1-s11).^2)-(s21).^2); % Impedence %
plot(f, real, 'blue', f, imag , 'r');
title('index');
Thank you for your GuidanceI think It's wrong.
S11 and S21 in these formulae must be complex number while you used the value of S11 and S21 in dB.
Right?
thank you but where is the thesis?Where did you upload?I upload an thesis only talking about Retrieval Method of Parameters here. It's very detailed in Simulation and Others.
They used method from paper of Xudong Chen. They also provided Matlab code in Appendixad. It's very useful.
Hope that it will help you
thank you but where is the thesis?Where did you upload?
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