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HFSS can be used for coil designs and is used for coil designs today by several manufacturers. This would be my recommended path. It is possible that you may choose use Maxwell for a coil design too. With the latest release v2014 (released Dec. 2013) there is a new capability that will really enhance 3D modeling design such as coils. you can look up "3D Component Library" in the help to get more info. If you need more detail level advice on setting up a coil I'd recommend you contact your local support. They should be able to help you very quickly and make you successful.