PAtch antenna in MWS 5

Hi all,
I am simulating a p@tch antenna in CST MWS - 5. All the results are fine.However I am unable to see the back lobe levels. In the back side it is giving a zero field ! . I have included open + add space for zmin boundary condition.Any ideas as to how I can do the back lobe calculation ?

Thanks for your time.

-Arun

if u check radiation pattern in polar form and there is no side lobe then u would not see any side lobe level information.
but usually antenna radiate backward generally because of finite size ground plane
u can check this backward level by zooming at the back side or u open the plot property and click plot mode tab ...there u will find Log Range option ... increase that and then probably u can see power level at back side of antenna