.mws reflection curve

Hi to all:)
I want to extract a Transmission or Reflection Curve vs. Wavelength or Freq. for an specified Photonic Crystal Geometry in order to finding its Band Gap in a time domain calculation.
I think, should take FFT from E-field components, but How?
also I used CST MWS ver 5.1.1 to simulate my Ph.Cry. but I could not find any link or option to achieving T or R characteristic curve in this software, Altough here is an example of it:
http://www.cst.com/Content/Applicati...tal+Simulation
how can we achieve specially Fig. 3 ? or other figures?

Hello,
I'm working in the sam subject, if you give me your photonic crystal structure i might help you with the band gab.
also could you please send me ur CST photnic crystal. i'm using HFSS at the moment and i would like to use CST
Thanks