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You are bound to find an example in the very large thread (emadi) featured near the top of this forum.
You may well find more examples in the HFSS supplied set while working some of the "Getting Started" help.
You can find step by step instructions in the following tutorial:
'Simulation of a 2.4 GHz Patch Antenna using IE3D a Tutorial by Nader Behdad EEL 6463, Spring 2007'
You can google the above tutorial name and get a pdf copy.