Figure 1.

(a) 3-dimensional structure diagram (top) as well as a typical cross-section along x-z shadow plane (bottom) for the repeating unit of the as-designed metamaterial absorber (MMA) labelled with sizes. The red brown represents metal copper foils and the light blue represents dielectric FR-4. p_x = 24 mm, p_y = 24 mm, t₁ = 6.3 mm, t₂ = 3.6 mm, b₁ = 11 mm, b₂ = 6.6 mm, t_m = 0.018 mm, t_d = 0.2 mm, and h = 4.36 mm. (b) The simulated and experimental absorption spectra of the as-designed MMA. The inset shows a photograph of the fabricated MMA.