Thank you for your reply PlanarMetamaterials,
I'm simulating an innovative shielding technique to solve EMI problem, Flexible Absorber Sheets (FAS) which is based on a dielectric-magnetic composite material formed by a polymer.
I attach the specs of the material. I have calculated his magnetic loss tangent like µ''/ µ'.
Regarding to measuring the microstrip without the material, yes I have measured the microstrip its own but I don't achieve good results, it seems like in simulation I measured less dB (for example, with the network analyzer at 3 GHz I have measured around -1dB and simulating I achieve -0.2 dB). I suspect it could be some problems with the lumped ports.
I have attached a report of the process step by step that I use to define my project. I'm a little bite fuzzy because I have tried so many things but I can't achieve the same results.
Thank you for your reply!