S Parameter extraction from Rsoft

Hi all,
I am working on my thesis about infrared metamterial absorber based on Rsoft simulation. In order to use impedance match theory to explain the resonance. I need to plot permeability, permittivity , impedance and refractive index in a wavelength dependent manner. I get the matlab code to post process the S parameter. But when it comes to the extraction of s parameter in terms of amplitude and phase, I have no idea how to make it. But I am sure that Rsoft can do that, because you can see here, http://www.rsoftdesign.com/news.php?...+Indices&id=80

Any suggestion will be a great help!

Borui