Slot antenna 4 higp

I am try to simulate slot antenna with higp I do that there is no occur validation error and simulating enough time but i didn't gain s11 and s21 parameter I just have white solution paper :)

higp pec submaterial touching slot antenna occur any error ! shoult it be any interwall between them !

higp and slot antena must be same level as ilustrated attact! or any different

s11 s21 result could be changed any visible solution ?







do u have any idea