help me ( RCS and HFSS )

Hi;

My problem with HFSS v9.0 is as fellow : I can not obtain a good result when I simulate RCS ( radar cross section ) of 3D objects ( box , cylindre,...) :

I have not found an example of simulation RCS? or a documentation

if anyone have an example, please send it to me ( RCS of cylindre, RCS of box,...) or a documentation ( *.pdf,...).

thanks;

you can get the rcs of shpere with hfss10.0