I want to draw the graph of real and imaginary impedance of an absorber by using FDTD. How to calculate the real and imaginary part of absorber? Kindly, suggest any tutorial or method to calculate by FDTD.
Edward J. Rothwell, Jonathan L. Frasch, Sean M. Ellison, Premjeet Chahal, and Raoul O. Ouedraogo, "Analysis of the Nicolson-Ross-Weir Method for Characterizing the Electromagnetic Properties of Engineered Materials," Progress In Electromagnetics Research, Vol. 157, 31-47, 2016.