scattering from reflector antenna

Hi
I want to know the differences between scattering
electromagnetic waves from common reflector antenna and the grid one(grid reflector antenna)
Is it possible to have the same RCS?
thanks

Your question is a base of a wide scientific study, mostly of military importance. Any antenna does reflect and scatter incoming waves, at east like a flat conductive board of the same shape. The frequency response of such scattering/reflection peaks where the radiating elements or the array is tuned to.