Radiation pattern mismatch

Hi all;

I matched S11 in paper and hfss simulation with the aid of sweetchoto. But I have problems with radiation pattern. When I draw pattern in xy xz yz plane in hfss, they have different cros-pol amplitude I do not understand why. So Shape of pattern like in paper but cros pol component have bigger amplitude than co pol component according to paper. air box lamda/3 far away every radiation surface, resonanat freq 2.45Ghz and 5.75Ghz and max mesh length over air box 12.5 mm, Can mesh length cause this situation? or Where I made an error?

please Anyone help me?

thanksSimulation_and_paper.rar