Fig. 1. Reflectance of common materials in terahertz band

Fig. 2. Simulation model. (a) Internal structure of unit cell; (b) periodic structure

Fig. 3. Reflectance of mixed coating containing different diameters of silicon carbide

Fig. 4. Mixed coating sample

Fig. 5. Mixed coating sample surface

Fig. 6. Simulation model of mixed coating sample flat area. (a) Internal structure of unit cell; (b) periodic structure

Fig. 7. Simulation model of mixed coating sample rough region. (a) Internal structure of unit cell; (b) periodic structure

Fig. 8. Simulated reflectance of mixed coating sample

Fig. 9. Measured reflectance of mixed coating samples containing different diameters of silicon carbide