Simulation of a 2-D Hexagonal Wired Mesh Structure on HFSS 11

Dear all,

I am a new user of HFSS-11.
I am trying to find reflection /transmission coefficient of a hexagonal 2-D structure of a wired mesh structure having wire radius of 0.3mm. It is a periodic structure. it can be excited by incident plane wave.

How can i convert a periodic structure in a unit cell.

Please reply soon.

Thanks.