Export impedance vs frequency of patch simulation to *.txt or *.sig from CST with VBA

Hi,

I am simulating a disk pach antenna at CST. I wrote a VBA script, I would like to export the input impedance vs frequency (Z11 Real Part and Z11 imaginary Part) to a file *.txt or *.sig. I have used the next code:

SelectTreeItem("Tables\1D Results\Z11 Real Part")
ExportPlotData "C:\Z11.sig"

The above code does not work. Is there other alternative to do that?
The simulation obtained the input impedance by a post-processing template.

Thank you