HFSS 3 band UWB antenna

Hi all!

Can somebody help me?
I have got an asigment to design (at HFSS) UWB antenna that covers 3 bandwidths:

450MHz - 830 MHz
800 MHz - 970 MHz
1800 MHz - 1900 MHz.

Can anybody help me or point me in the right way?
I'm new at this and don't know anything about it...
All i can find is antenna that covers 1 bandwidth.

Thank you!