corner truncated patch circular polarization

hi all,
can anybody help me please, i am solving university project.i have already created the corner truncated patch in CST,with single microstrip feed line.
(FR4 with Er=4.4, h=1.58mm,height of copper h=0.035mm),

it should resonate on f=2560MHZ and input impedance Z=50Ohm
i used known formulas to calculate dimensions, trim
side a=28mm
trim of corner c=3.9mm


now i have problem with polarization. i need to get circular, but i cant get anything like that, just some linear.
i tried embed microstrip deeper but nothing changed(with equation Z=cos^2(pi(R/L)) i get deep R=7mm for 50Ohm impedance)

A circular patch with a single feed point will create linearly-polarized radiation. If the circular patch antenna is perturbed into an ellipse and fed properly it can produce circularly polarized electromagnetic waves. (Source: Wikipedia)

i ma not sure if i understand what you mean by perturbed into an ellipse and fed properly, can you be more specific please

image is here
https://www.edaboard.com/thread198094.html#post831715

As I mentioned in the earlier post, I found that in wikipedia. From the statement, I think instead of a circular patch, you need to make it look like an ellipse. Can you upload your design.

-sv.

hello plagat..can you tell me how to draw the truncated corner patch antenna in cst..?