[CST] Antenna import from Solidworks to CST

I draw "conical helix antenna on a dielectric sheet" in AutoCAD. I labelled the layers of the helix as layer 1 and cone as layer 2.

And then import the drawing from AutoCAD to Solidworks. The file converted into 3D, and I saved it.

Finally, I import the into CST. The helix disappeared, and only the cone appeared. Why it's missing? how to get it back?

I wanted to do parameterized simulation and optimization in CST for this shape. I have attached the picture after import in CST and the AutoCAD & Solidworks files. Please help.

thanks in advance.

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