S21 diagram for EBG in CST

Hi,

Reference to this paper --> "Tailoring the AMC and EBG Characteristics of Periodic Metallic Arrays Printed on Grounded Dielectric Substrate", I'm trying to get the S21 curves like the ones in Fig.11 (a) of the paper.

- I've set up the exact model with ground plane, sustrate, Microstrip tx line, and EBG structure in the middle.

- I haven't been able to reach the results found in the paper and have been getting this error over and over --> "Some higher order propagation modes at port 1 (and port 2) are not considered in time domain calcultor......", any clue why I'm getting this?

I've set up my waveguide ports for 2 modes, don't know if this is correct or not, just took a guess :S

Attached is the figure from the paper, my CST file, and the results I've been able to reach so far. Please let me know what's wrong with my file?

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