I need help with HFSS

hello every one , im very new and it is first time to me designing antenna using HFSS , i had design array for wimax at frequency 2.45-2.6 GHz , the result it is unaccepted bcs of side and back loops of radiation pattern so big nearly to main loop at frequency 2.4 Ghz , so i no know maybe the slection of substrate is wrong of ground plane is so small , i no know so i need your help

i'll upload the file for anyone can help me