Help:: patch antenna

Hi to everyone

Recently i have simulate one patch antenna, from that i get return loss as below. But i want to know "what the inference can be drawn from this result". Please help to extract information from this result.
I am waiting for your valuable response....

At least we can see that simulation results must be wrong. S11 > 0dB is physically impossible.

Thanks
There is some problem with port excitation i will correct it.
Do you have any examples on CPW feed patch antenna in HFSS ?
If possible then send me, from this i want to study CPW feed technique.
Again Thanks...........