absorption= 1-mag(S(FP1:1,FP1:1)*S(FP1:1,FP1:1))-mag(S(FP2:1,FP1:1)*S(FP2:1,FP1:1)) is it correct for absorption ?

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Vadym Slyusar

Dear Mohammad Sarwar Raeen You can see the more difficult formula for absorption calculation in this paper on page 3017 (or 11 by local enumeration):

Article Design of a wideband terahertz metamaterial absorber based o...

On the other hand in this discussion

https://www.researchgate.net/post/How_can_I_simulate_Metamaterials_Absorber_using_CST_MWS

was said that the absorption is equal to A(w)=1-S21(w)^2-S11(w)^2 or in your interpretation 1-mag(S(FP2:1,FP1:1)*S(FP2:1,FP1:1)) . It is a particular case of approach with was used in mentioned above article.

Said Choukri

Yes it's correct, but in case that you used two floquet ports having each one two excitation modes.

To simplify your equation you can write it this smooth version :

absorption= 1-mag(S(FP1:1,FP1:1))^2-mag(S(FP2:1,FP1:1)) ^2