how to convert my hfss file to autocad(.dxf ) file

Hello to convert Hfss file to .dxf file.
i have tried to convert my hfss design to autocad file but after conversion it is showing my ground plane only and nothing else.
can anybody tell me the step by step procedure of how to convert the hfss design to .dxf file
regards

by default HFSS will only take the z=0 planes. so if you move your model and export it again it should work.