some question in feko (HELP!!!)

Dear all,

Have a nice day.

Now I use 3D Feko for antenna and I have some question on it.

1. How can I make the Feko calculate on frequencies bands like from 1 : 3 GHz ?
2. How can I analysis the cassegrain antenna in feko ?
3. How can I obtain the following relations :
Gain VS Frequencies in graph
Efficiency VS Frequencies in graph ?

Thanks and Regards

1: For solving in feko you can set the frequency range for which the software needs to analyse the structure(option is available on the left side). It will create mesh according to your frequency.
2 & 3: You first create a far field region in feko, later run the solver, once its done use postfeko to view results.