simulated problem (help)

I have simulated a cpw antenna from a paper with hfss v11.
My simulated result is not the same with the paper's at all.
Who can help me to check my hfss file?I don't know what's wrong on it.

ps:Attached file are included paper,hfss file and simulated result's photo.

First, wave port definition is not correct. You should locate the edge of the waveport at the middle of the ground plane.
Second, one of the faces of the radiation box should be overlapped the waveport position.