Fig. 1. Conceptual diagram of the proposed FSS absorption structure. (a) FSS structure; (b) angular stability performance

Fig. 2. Unit structure of FSS absorber

Fig. 3. Equivalent circuit model

Fig. 4. Absorption response of each layer and polarization insensitivity. (a) Monolayer absorption response of CST and ADS; (b) polarization insensitivity

Fig. 5. TE polarization oblique incidence impedance. (a) Real part of impedance; (b) imaginary part of impedance

Fig. 6. TM polarization oblique incidence impedance. (a) Real part of impedance; (b) imaginary part of impedance

Fig. 7. Oblique incidence absorption performance. (a) TE polarization; (b) TM polarization

Fig. 8. The results of absorptivity. (a) TE polarization; (b) TM polarization

Fig. 9. Surface current distribution at the resonant points. (a) Layer-I, 5.5 GHz; (b) layer-I, 16 GHz; (c) layer-Ⅱ, 8 GHz

Fig. 10. Electric field distribution under different incident angles

Fig. 11. Influences of different parameters on absorption performance. (a) R; (b) h₁