Circular Loop antenna in HFSS at 900 MHz

I've done the desing, but there is a problem with my radiation pattern i guess that a circular loop radiation patern is like an eight in horizontal form like in the books but my radiation pattern is so different i put symmetry to model, etc but i can`t find the problem maybe you can help me please

thanks friends.
loopfinal.rar

8-shapped circular loop antenna in hfss at 145 mhz
i m new to this simulation .... if some one can help me how to simulate this type of antenna in hfss?

Hello,

What's the size of the loop antenna? Is it a small antenna compared to the wavelength?