Hi irfan1,
I guess it would be pretty much hopeless to simulate this structure in HFSS. The structure is extremly large.
At 11 GHz and taking into account the high dielectric constant of the material you will have a box of 20*20*20 wavelength. Using just the basic discretisation for a second order methode (lambda/4) you will have 80*80*80 tets-> more the 500 000 tests just for the basic mesh. This does not include any geometry refinement for the coax or slabs.
I don't think HFSS can handle this ....
Any comments from our HFSS experts concerning this problem?
F.