I have designed a 2.4 GHz RFPA using Cree CGH40010F GaN HEMTs. I have finished the layout and also designed the heat sink in Ansys Workbench. Now I need to export the heat sink into ADS and assemble it with the PA board. I tried importing the .dxf file of Ansys but it seems something is going wrong. How do I assemble the heat sink and the board in ADS?