what type of fractal antenna is suitable for my freq.!!! "Final Yr. Project" plz help

i'm required to find out the suitable fractal antenna type for my single band with a range of freq 850-900MHz..

i have done a lot reading about the design of fractals and characteristics but still can't decide which is the suitable pattern.

1) What's the difference between von koch and Sierpinski Gasket in terms of freq. , return losses dB and single bands?

2) How can find the suitable properties (number of iteration order, wavelength and gain losses) for my freq. ? is there any formulas that i can define them by this range of freq

as i know single band is simpler than the multi-band behavior which i need only one range of frequency.


"Experts I Need Your Help"

hi
in antenna design with fractal technique i never seen in papers numerical method for optimization and usually Koch not absolutely has benefit to other kind and they only use when it possible to utilities for a patch but one person said me we can design antenna by mathematical method and i have one ebook about fractal mathematical and if u want i can email it for u

I'm really not sure.. but thanks for replying .. "

this's my email:
noreshog@hotmail.com

hi
for more information see these papers :
1-MULTIBAND FRACTAL PLANAR INVERTED F ANTENNA (F-PIFA) FOR MOBILE PHONE APPLICATION
Progress In Electromagnetics Research B, Vol. 14, 127–148, 2009
2-A NEW REDUCED SIZE MICROSTRIP PATCH ANTENNA WITH FRACTAL SHAPED DEFECTS
Progress In Electromagnetics Research B, Vol. 11, 29–37, 2009