How to model materials with complex conductivity in HFSS?
Derive relative permittivity and conductivity from complex refractive index. Start with complex refractive index to derive the real and imaginary parts of relative permittivity. Use the real part of relative permittivity to define the permittivity of the material and use the imaginary part of relative permittivity to derive the conductivity that you will use in the material definition. See the attached document for more details.
Solution Document