Fig. 1. Schematic of unit cell of absorbent structure.(a) Stereogram; (b) top view; (c) side view

Fig. 2. Equivalent impedance of metamaterial absorber

Fig. 3. Current distributions of top metal and bottom metal surfaces at different resonant frequencies. (a) 11.5 GHz; (b) 15.5 GHz; (c) 21.3 GHz

Fig. 4. Electric field distributions at different resonant frequencies. (a) 11.5 GHz; (b) 15.5 GHz; (c) 21.3 GHz

Fig. 5. Influence of structural parameter on wave absorptivity. (a) FR-4 thickness; (b) opening width

Fig. 6. Influence of metallic material parameter on wave absorptivity. (a) Conductivity; (b) relative permittivity

Fig. 7. Simulated absorptivity

Fig. 8. Influence of polarization angle on absorption performance at different modes. (a) TE mode; (b) TM mode

Fig. 9. Influence of electromagnetic wave on absorption performance under different incidence angles

Fig. 10. Array. (a) Structural diagram; (b) simulated results