Simulate a UWB CWP antenna ?

I'm simulating a UWB antenna. I've completed my project but my results doesn't like the fig. I think there's a mistake but I can't see it. Plz help me!

Hi

check this topic may be you will get your problem solved

UWB antenna simulation with CST and HFSS

https://www.edaboard.com/ftopic355250.html

thanks very much, I'll check it