Need help for designing Fractal Antenna

Hi Friends,

I have to design a fractal antenna which should be more accurate than a dual band patch antenna so friends now i have to design a fractal microstrip patch antenna which should resonate at two frequencies? may i know how it is possible? and i designed a patch antenna it is resonating with harmonics so how can i change or cut into fractal from microstrip patch antenna? can anybody help me? and also tell me the main difference between dual band patch antenna and a fractal antenna?