Pattern problem

Hi;

I am tring to make a simulation of the ellipse antenna in HFSS9.0. And I have reached some results. my far field pattern is good. But near field pattern isnt good between 300 - 60 degree. I dont understand why it isnt good.

If somebody could tell it I will be glad..

thank you for your interest...

maybe influened by your excited model
and i think if frequence is higher,the far field pattern will be not symmetric