Fig. 1. Calculation results of the FEM

Fig. 2. Stucture schematic diagram of the FSS unit

Fig. 3. Influence of incident angle on the S parameter in FSS

Fig. 4. Distribution diagram of electric field intensity at different frequencies. (a) f =9 THz; (b) f =9.2 THz

Fig. 5. Schematic diagram of the structure of crescent-shaped FSS. (a) Crescent-shaped periodic structure; (b) crescent unit structure

Fig. 6. Transmittance and reflectivity of crescent-shaped structure FSS. (a) Incident angle is 0°; (b) incident angle is 30°

Fig. 7. Structure of the FSS. (a) Upper and lower surface unit; (b) intermediate layer unit; (c) side view

Fig. 8. Influence of incident angle and polarization mode on the transmission characteristics of FSS. (a) Transmission coefficient curve of FSS under different incident angles; (b) transmission coefficient curve of FSS under different polarization modes

Fig. 9. Influence of media properties on FSS transmission characteristics. (a) Transmission coefficient curves of media with different thickness; (b) transmission coefficient curves of different substrates