Active Phased Array Simulation

I want to simulate an 8 x 8 vivaldi array with triangular grid configuration in HFSS. Can anybody help me in setting up the problem so that i can assess the performance of element in array environment

if you hav a prototype of the antenna try using a folded d antenna or
an antenna tuned to the frequency that you want to receve and buy or
biuld a simple sine wave generator at that frequency to tranmitt a signal
and use an ocilliscope ,if avalible, to monitor it

steve