Nine-array antenna with cst or hfss

i want to simulate an 9 array antenna with hfss or cst but i have problem with excitations and bonndaries,i don't know that how does it do
plz help me

The secret is to start reading and ask questions with useful details.

Recent thread about hfss and 8 elements:
https://www.edaboard.com/thread356272.html

HFSS is always more convenient software for antenna design with more antenna specific tools available.
I have used both CST and HFSS and my recommendation is that if you want to work on antenna seriously then it is better to switch to HFSS.In HFSS you have more control on boundary conditions and excitation as compared to CST