How to calculate the corner cut for square antenna to obtain CP

[Dobilise]

Hi all,

please any one can help,

I want to design a square patch antenna with circular polarization but I don't how to calculate the dimension of the corner cutting?

thanks in advance,

 

[Dobilise]

Some doc's to help to calculate the trunc to get circular polarization

View attachment Feeding and how to get polarization.pdfView attachment Trunc calculation.pdf