Exporting HFSS model to AutoCAD with high resolution

Hi,

I have got some resonator drawn in HFSS, and would like to export them to AutoCAD.
I did it using the export, as dwg, and in AutoCAD I was able to import and everything seems to work, until I realized the curve I see in AutoCAD was very blocky, the bends were not smooth at all.

Is there a way to export really smooth model?
In HFSS by changing the render I can see very smooth model, but on exporting they are rough.

A reply to myself:

For curved structure, I couldn't find a way to expend the curve as a true curve.
However, a comprise that works for me is I instead specify the segment number, and set it to resonably high.
This is OK as at the end from AutoCAD I will also be doing the same to generate a e-beam file.