help in IE3D problem

Hi,I'm now using ie3d software to draw my antenna design.Currently,I only draw out the patch and assume there is infinite ground plane.I'm using coaxial probe feed technique.But how can I define my dimension for my dielectric substrate since I cannot see the substrate block appear in 3D view?Or can use ie3d to draw out my substrate? Or can I draw out the ground plane and assume that is my dielectric substrate's dimension?
Please help me and give me advice..thank you very much.

You can define substrate, finite ground plane etc. in IE3D. In the help file of IE3D you can find example how to define all these.