Fig. 1. Relationship between chemical potential and applied voltage

Fig. 2. Electrical characteristic curves of graphene materials under different chemical potentials. (a) Variations of real and imaginary parts of surface conductivity with frequency; (b) variations of real and imaginary parts of surface impedance with frequency

Fig. 3. Unit structures of dynamic adjustable broadband SIW absorber based on graphene. (a) Plan view; (b) perspective view

Fig. 4. Simulation of S-parameters for dynamically adjustable broadband SIW absorber based on graphene

Fig. 5. Simulation results of absorber under different graphene square resistances. (a) Absorption variation curves; (b) variation of reflection coefficient with frequency

Fig. 6. Effects of polarization angle and incident angle on absorption. (a) Variation of absorption with polarization angle; (b) variation of absorption with incident angle

Fig. 7. Graphene layer loss densities at different frequencies. (a) 20 GHz; (b) 30 GHz; (c) 40 GHz

Fig. 8. Stereoscopic diagram of 2×2 array of dynamically adjustable broadband SIW absorbers based on graphene

Fig. 9. Curves of absorption rate and return loss variations when the surface impedance of graphene is 70 Ω/sq

Fig. 10. Simulation results of absorber under different graphene square resistances. (a) Absorption variation curves; (b) reflection coefficient varying with frequency