PIFA GSM antenna on a FR4 PCB, simulation software tool

Hello,
I have designed a PIFA GSM antenna on a FR4 PCB, but i want to run some simulation. Can anyone suggest me some software tool?
Thanks in advance

Hi,
There are many tools available such as HFSS, CST, WIPLD. HFSS and CST are easy for modelling structures. HFSS is widely used and is FEM based which you can try.

Hope this helps

-Ankesh

thank you for your help.