Figure 1
From: Backward spoof surface wave in plasmonic metamaterial of ultrathin metallic structure
Structure and dispersion relations of the CSP structures.
(a) Geometry of the traditional (top) and the proposed (bottom) symmetric CSP structures. (b) Dispersion curves for the different symmetric CSP structures. The modified one (orange dashed line) indicates the dispersion curve for the CSP pattern in which four small grooves inside each slot near the centric strip have been removed. Only the fundamental modes have been plotted. The metallic strip is considered as PEC with negligible thickness and the geometric parameters are set as g = 0.67d, h = 1.6d, a = 0.1d, w = 3.4d, respectively.
