Fig. 1. Comparison diagram of absorption and scattering characteristics of two perfect absorbers: (a) The electric field intensity diagram of absorber ( ); (b) the electric field intensity diagram of absorber ( ); (c) the comparison diagram of the far field distribution of the two absorbers; (d) the comparison diagram of the enlarged far field distribution of the two absorbers

Fig. 2. Absorption characteristics comparison of different perfect absorbers: (a) The far field comparison diagram and (b) far field comparison enlarged diagram of impedance-matched and impedance-mismatched absorbers of the first set; (c) the far field comparison diagram and (d) far field comparison enlarged diagram of impedance-matched and impedance-mismatched absorbers of the second set; (e) the far field comparison diagram and (f) far field comparison enlarged diagram of impedance-matched absorbers of the above two sets

Fig. 3. Analysis of absorption characteristics of electromagnetic “black hole”: The electric field intensity diagram of (a) impedance-mismatched and (b) impedance-matched electromagnetic “black hole”; the electric field z component diagram of (c) impedance-mismatched and (d) impedance-matched electromagnetic “black hole”; (e) the far field comparison diagram and (f) far field comparison enlarged diagram of impedance-mismatched and impedance-matched electromagnetic “black hole”

Fig. 4. Absorption characteristics comparison of perfect absorber and electromagnetic “black hole”: (a) The far field comparison diagram and (b) far field comparison enlarged diagram of impedance-mismatched perfect absorber and electromagnetic “black hole”; (c) the far field comparison diagram and (d) far field comparison enlarged diagram of impedance-matched perfect absorber and electromagnetic “black hole”

Fig. 5. Radial transformation relationship curve

Fig. 6. Absorption characteristics comparison of perfect absorber, electromagnetic “black hole” and inner PML: (a) Electric field intensity diagram and (b) electric field z component diagram of inner PML; (c) far field comparison diagram and (d) far field comparison enlarged diagram of impedance-matched perfect absorber and inner PML; (e) far field comparison diagram and (f) far field comparison enlarged diagram of impedance-matched electromagnetic “black hole” and inner PML