lumped element in hfss

I'm wondering whether it is possible to use lumped element (ideal inductor and capacitor) in HFSS.If so how can we do that?
I want to use this possibility (if there is) to model Metamaterials (Those materials with negative refractive index) in HFSS.I appreciate your help.

Yes, you cam assign lumped RLC components, same procedure with assigning lumped port. Current HFSS can not support negative refractive index calculation.

Regards,

Well, you cannot input materials with negative epsilon and negative mu but you can observe the NR phenomenon by other means like looking at a dispersion diagram etc.
My two paise (Indian equivalent for cent, 1 cent = 45 paise) worth.

-svarun

Planar negative refractive index media using periodically L-C loaded transmission lines