trace width of PCB antenna

[golliath51]

what is the relationship between the trace width of PCB antenna and FR4 PCB thickness for a antenna lambda / 4.

[golliath51]

Hi,

Thanks for your answer. I know the relationship with ground plane bellow but the antenna part don't have ground plane. So i d'ont know the relationship of trace with when there don't have ground plane below.

Best regards