optimize multiband antenna (filter)

I want optimize multiband antenna (filter) to many various frequencies. How can I do that, or what optimization goals I must set up. i want this work in ie3d software.

You can define a goal as mag(S11)< - 10.5 dB over a bandwidth you are interested. You can define multiple such goals with each one in each band. Certainly, you will need to make sure your tuning mechanism should be able to achieve it.

EM software optimization is very slow. Try to model the structure in circuit and optimization in circuit.