conformal antenna design problem

Hi

i am doing my research on conformal antenna design. i am designing an simple circular patch antenna using CST 2009
and trying to bend it, but the problem is i cant calculate the bending angle and radius of curvature.
Basically, For which radius i will get which angle?

So will you guys give me some idea about how to calculate bending angle(with respect to horizontal plane) and radius of curvature?

Thanks

Can you add a virtual focal point in the design as a fiducial point for reference?

will you please elaborate this-
"virtual focal point in the design as a fiducial point"

I made my cylinder (circle) with the coordinate (0,0).