Fig. 1. Boundary condition setting for CST

Fig. 2. Structural diagram and equivalent circuit diagram of metamaterial absorber. (a) Structural diagram; (b) equivalent circuit diagram

Fig. 3. Structural diagrams of three different FSSs

Fig. 4. Reflection coefficients of FSSs with three different structures

Fig. 5. Reflectivity curves of metamaterial absorber under with different parameters. (a) h; (b) R

Fig. 6. Reflectivity of designed absorber for different oblique incidence angles in TE and TM polarization modes

Fig. 7. Equivalent medium model

Fig. 8. Equivalent electromagnetic parameters. (a) Equivalent permittivity; (b) equivalent permeability; (c) equivalent impedance

Fig. 9. Current distribution of absorber at resonant frequency. (a) Surface current of FSS; (b) surface current of dielectric backplane; (c) surface current flow during magnetic resonance

Fig. 10. Electromagnetic loss at 12.7 GHz absorption peak. (a) TE mode of square ring crossed element; (b) TM mode of square ring crossed element; (c) TE mode of T-shaped square ring crossed element; (d) TM mode of T-shaped square ring crossed element; (e) TE mode of notched T-shaped square ring crossed element; (f) TM mode of notched T-shaped square ring crossed element

Fig. 11. Actual picture and measured and simulated results of designed absorber. (a) Actual picture; (b) measured and simulated results

Table 1. Performance comparison of designed absorber in this paper with those reported in other literatures