It depends on what you are looking for, you can convert S parameters to ABCD parameters in ADS and then use the abcd parameters to get different impedance/admittances of different circuit structures such as pi/t-models.

References:

1. https://www.chegg.com/homework-help/derive-abcd-parameters-t-circuit-shown-figure-1-figure-1-abc-chapter-5-problem-5p-solution-9781133172871-exc

2. Article Conversions Between S, Z, Y, h, ABCD, and T Parameters which...

3. https://www.chegg.com/homework-help/derive-abcd-parameters-t-circuit-shown-figure-54-chapter-5-problem-5p-solution-9781305636187-exc

Hi dear, My question is what are the formulas of equivalent L,C of multiple ring SRR split ring resonator? I need the formulas to use it in MATLAB and then design in CST

Greetings, my suggestion regarding the same would be that. Based on the survey underwent the common thing noticed is that, there is no common formula for extracting the L value for MM unit element. The formula is literally different for different shapes of unit element. But for extracting capacitance observed the common formula as c= (epsilon * A)/D.

Hi every researcher here. May you kindly help me how could I design the equivalent circuit of metamaterial unit cell using CST not ADS,please.

Thanks..