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Fig. 1 | Nanoscale Research Letters

Fig. 1

From: Ultra-wideband and Polarization-Insensitive Perfect Absorber Using Multilayer Metamaterials, Lumped Resistors, and Strong Coupling Effects

Fig. 1

Schematic geometry of unit cell for the ultra-broadband perfect metamaterial absorber. (a) The 3D schematic of a unit cell. (b) The bottom layer of proposed PMA with the split ring resonator-II (SRR-II). (c) The third layer of proposed PMA with the split ring resonator-I (SRR-I). (d) The second layer of proposed PMA with first metallic DSRR (F-MDSRR) microstructure and four lumped resistances. The optimized parameters of the PMA were d1 = 2 mm, d2 = d3 = d4 = 1 mm, w1 = w2 = w3 = w4 = 0.8 mm, P = 8.4 mm, R1,2 = 60 Ω, R3,4 = 180 Ω, a1 = 7.8 mm, a2 = 6.6 mm, a3 = 5 mm, a4 = 3.4 mm, s = 1.2 mm. The thickness of the copper is 0.036 mm

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