Wave propagation properties in stacked SRR/CSRR metasurfaces at microwave frequencies

In this paper, we study wave propagation in stacked SRR/CSRR metasurfaces at microwave frequencies. Computation of the dispersion diagram of both metasurfaces highlights the possibility to obtain forward and backward waves, respectively. The backward waves can be achieved only at the quasi-static resonance in case of stacked CSRRs metasurfaces and provided the longitudinal lattice is small enough. The experimental results for both structures show a good agreement with the computed ones. The physics underlying the left-handed behavior is found to rely on electroinductive waves, playing the interplate capacitive coupling the major role to explain the phenomenon.