Simulating antennaA 60 GHz can any1 tell the effect of radiation box size help needed

urgently need help what is the effect of radiation box size on s11 parameter and radiation pattern.
I tried simulating with different radiation box sizes but unable to conclude anything since it is not linear relationship with size it seems.
plz help your help will be greatly appreciated.

Hi Lakhan221989,

Obviously this will depend on what software you are using. A general rule of thumb is one-quarter wavelength. Ensure it is adequately meshed.