multi band base station antenna

hey.......i am to design a multi band base station antenna that could resonate at different frequencies like gsm, cdma, umts and wimax.....i have decided to make a dipole patch antenna to achieve a frequency band of 2-4 GHz....so now i need some guidance for its simulation over hfss tool.....and would i be able to come up with the desired frequency range or not....?

hey people plz help man.....