Fig. 8
From: Design, fabrication and characterization of metamaterial absorber for sensing applications

Variation of the absorption spectrum at different radii of the outer circle Ro while the other geometrical parameters remain constant at their initial values (\({R}_{i}\) = 1.8 mm, \({D}_{i}\) = 0.25 mm, \({L}_{h}\) = 0.8 mm, \({W}_{h}\) = 0.25 mm, \({D}_{o}\) = 0.25 mm, \({L}_{v}\) = 1.25 mm, and \({W}_{v}\) = 0.25 mm.)