Fig. 2

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Dispersion diagram of the EC-SRR composite medium for kx incidence: propagation constant β (rad/m) and attenuation constant α (Np/m). Propagating SRR modes are plotted in blue, evanescent SRR modes with large propagation constant in green and evanescent SRR modes with small propagation constant in red. A frequency bandgap is present between 5.3 and 6 GHz. Lightline modes are illustrated in black.
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