Help Simulating PIFA Antenna

I do have a PIFA antenna on 0.8mm FR4 and since I do not have HFSS or like I can't simulate the performance, who can help me in this ?.

Are you asking someone to do it for you?

Try IE3D, you can get a free trial version or student version for few months and if you are effective 3 months should be enough for your work, or not?