Impedance measurement in CST

I have simulated UWB ant. how can i get impedance (resistance and reactance) in CST.
:D

You can see the antenna port impedance under: "1D-Results"->"Smith Chart", in the curve properties add the desired frequency(s) and the result will appear on screen.
Regards,
P.

I need the values not for a signle frequency but for the whole range of frequencies

HI snkhan,
Result--> S-parameter calculations--> calculate Z and Y matrix might give you what you want.
Hope this is useful.
Cheers,
Element7k