Array antenna p/a/t/c/h simulation in ADS momemtum

Hello folks,

I am designing a array antenna used in 3gpp. I want to simulate one p/a/t/c/h in @ds momentun. I drill a hole in the ground plane to give the feeder. But it seems be impossible to do it in momentum? Could anyone give me some suggestions? Another question is where to put the port? I am really new in momentum. Thank you in advanced.

PS. I create substrate layer like
FREESPACE
Taconic
/////GND////

and Mentalization layers like
FREESPACE
-----Strip cond2
Taconic Via hole
//////GND/////