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Phase calculation of S-parameter
Posted 14 ott 2017, 01:15 GMT-4 Low-Frequency Electromagnetics, Wave Optics, Parameters, Variables, & Functions Version 5.2a 1 Reply
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Hello,
I want to calculate the phase of S-parameters e.g. S11=real(S11)+i * imag(S11) to mag(S11) & angle(S11) At first, i think that just using the angle or arg function can transform cartsian to polar form.
Then i found the paper [Z. Szabo, G.-H. Park, R. Hedge, and E.-P. Li, “A Unique Extraction of Metamaterial Parameters Based on Kramers–Kronig Relationship,” IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 10, pp. 2646–2653, Oct. 2010.] and there is an matlab code with phase and magnitude of S-parameter.
The problem is that in the code, S11 is calculated as following equation S11 = (magnitude of S11) * [cos(phase of S11) - i * sin(phase of S11)] It shows that the phase equals to -angle or -arg of S11
What is correct method of calculation of S11?
P.S. I found comsol equation to calculate of S-parameter which is "if(abs(arg(ewfd.beta_1))<=0.25pi||abs(arg(ewfd.beta_1))>=0.75pi,ewfd.S1xexp(-jroot.phase),0) " If someone can interpret of this equation, i will very thanks to your kindness,,, please help me!
Hello Taeil Kim
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I am from EEE background so matlab is most important thing to solve this type of problem. When you found a solution with COMSOL then it will better for you to learn more about that. This problem has a easy solution with livelink. Let me know of you need more help to solve that :)