Dear Punyatoya Routray you can see pages 33 - 36 in this publication:

https://www.researchgate.net/profile/Smrity-Dwivedi/post/How_to_connect_electric_circuit_to_Metamaterial_on_HFSS/attachment/5ffd34632b12470001e31e07/AS%3A979026600554496%401610429539312/download/12011.pdf

You can send me all s-parameters to me or your design HFSS file in which you are comfertable then i will generate your mtm absorber exact RLC electrical equivalent circuit. By my own patent theory in just one hour. So no need to worry.

Many fundamentals can be found from books and journals of Christophe Caloz et.al

Punyatoya Routray

Using CST MW Studio, after getting your S-parameters by performing EM-Simulation, you can use the extraction platform available on CST, this option will allow you to extract the model in transmission lines of your structure including : the ABCD Matrix, R, L, C, G, phase velocity, Group Velocity,....

to do this go to Post Processing Template>>>Result Templates>>>>the following icon will pops-up and choose '' Extract TL Properties from S-parameters '',

Said Choukri I could not find this option in CST. Is it available in CST MWS 18 ?

@ Punyatoya Routray , just by the knowledge of all 4 s-parameters i can generate the exact RLC electrical equivalent circuit of your designed MTM absorber.

Krunal Patel, It is available in CST 2020 version.

Said Choukri, could you please elaborate on how can we use these obtained RLC values to obtain an equivalent circuit. Is there any particular structure where we have to put these values? How this will affect the circuit. I have read about "Foster canonical forms of the equivalent circuit for electric antennas and magnetic antennas". Are we have to simply put these obtained values in these structures?