I am also trying to work on the sierpinski gasket for multiband operation. I designed some of the models explained in papers. But I cannot find any gerneral formula for choosing the line length of the triangle. Also, the various frequencies for different iterations should be f2 = f1/scalefactor. But this is not the case. How do you feed it ..... using lumped port in HFSS? Did you find any exact design equations for triangular patch. Kindly share them if you have any literarture on the basics of such an antenna.