how to fabricate two arm archimedean spiral antenna

hi to every one,

i have designed two arm archimedean spiral antenna in cst, after the simulation has been done, i want to fabricate the antenna by converting the cst file into dxf file and open via autocad. but i have faced problem how to open this dxf file via autocad. please can any one help me and guide me how to open this DXF FILE VIA AUTOCAD, or another alternative way which can lead me to the fabrication this antenna.
your replies and help are highly appreciated.
best wishes