Finite Ground plane in UWB design using HFSS

I work in design UWB microstrip patch antenna with finite ground plane
and i want to know what the boundary condition can i assign to get the result
what boundary condition for the finite ground plane ?

i design using Ansoft HFSS 11


Thanks in advance

Eng.M.Hassanien

hi
it is not necessary to define a boundary condition.
just define it ac copper.

this is the paper that i worked on

hi
u can use PEC or finite conductive or copper . but for fast simulation with best result better u use sheet with finite conductive .