Plz someone plz help me out......(UWB antenna in HFSS)

plz help me its urgent.......
i m making an antenna for UWB. but my results are not coming right. i m uploading my simulation file. the dimension are right. bcoz this antenna has been made by someone in CST simulater but i m using HFSSv9.0. and yet not get the same or better result... plz help me out this is so important for me......PLZ some