yeah, i know about the S11 and the -10 db and how to calculate B.W, thanks Eng.Refai .
but i'm asking about the wimax range , i know there ara many ranges for wimax , and i'll be working on 3.5 Ghz , but is there any limiting for my bandwidth, as u know , i can get a larger bandwidth by changing in the height of the substrate .
so i wanna know the bandwidth for the wi-max at 3.5 Ghz .
Actually i designed a simple Rectangular & circular microstrip antenna.
i'll upload the s11 soon isa.