Please someone help me in designing PIFA using HFSS.I dont know how to add dielectric between ground and patch.and also how to adjust the length of conductor how to make it of our own choice.or could you send me the pifa hfss design.THanku.
If you want to learn to use HFSS, start from the basics and do not jump steps.
If you are in a rush, search for a small program called 'HFSS Antenna Design Kit'. It should help you generate HFSS models within seconds. (I checked and it has PIFA models as well).