Design bow tie antenna array for 3.5 GHz Wimax operation

I am going to design a bow tie antenna for 3.5 GHz I need formulas for design calculation.
can anyone help me out
Thanks

You can google bowtie designs, but for Wimax at 3.5 GHz using it makes no better sense that an ordinary dipole.
Bowtie dipole is used for "very" wideband applications, like 20-50% bandwidth.

I need to design base station antenna for wimax at 3.5 GHz. i need help regarding its design how to work it?

To be sure your antenna will work, take any base station antenna for 0.9 or 1.9 GHz and scale it to 3.5 GHz. Then you can design your version and compare it with it.

if you got any example can you send me please.