Unit cell geometry of the proposed broadband absorber: (a) top view and (b) perspective view. The final geometric dimensions are P = 15.5 mm, R = 7.3 mm, R ₁ = 6.1 mm, R ₂ = 1 mm, L ₁ = 2.5 mm, L ₂ = 2 mm, w = 0.6 mm, e = 0.6 mm, g = 1.7 mm, and d = 3 mm. Comparison of the absorptivities obtained from numerical simulation using Ansys HFSS and circuit level simulation: (c) structure without resistors and (d) structure with resistors [58].