The first step in designing a device based on the gap waveguide technology is designing the periodic structure. This is based on the dispersion diagram. By selecting the values of an EBG structure dimensions a stopband from X to Y GHz will be achieved. 

How can I prove that using CST? i.e. how can I get the dispersion diagram for an EBG periodic structure to show the stopband region for my structure dimensions?

Note: I have created two parallel plates, on the bottom one, a texture of bed of periodic square nails is provided. I have found in some tutorials the I need to use Eigenmode, but I could not get the expected result. What is wrong you think?

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