Fig. 1. Four modes of operation of the proposed structure

Fig. 2. Proposed switchable FSS structure. (a) Designed periodic structure; (b) minimum unit structure

Fig. 3. Equivalent circuits of structure. (a) Equivalent circuit model when structure operates in second-order filtering function; (b) equivalent circuit model of PIN diode

Fig. 4. Simulation results of equivalent circuit. (a) S-parameter of TE polarization incidence; (b) S-parameter of TM polarization incidence

Fig. 5. Schematic diagram of FP resonance during polarization rotation

Fig. 6. Transmission and reflection of TE and TM waves in the second-order filtering function. (a) TE polarized wave transmission in A mode; (b) TM polarized wave transmission in B mode; (c) TM polarized wave reflection in A mode; (d) TE polarized wave reflection in B mode

Fig. 7. Transmission and reflection of TE and TM waves during polarization conversion function. (a) TE wave in C mode; (b) TM wave in D mode; (c) TM wave in C mode; (d) TE wave in D mode; (e) polarization conversion rate in C mode; (f) polarization conversion rate in D mode

Fig. 8. Distributions of electric field in plane of direction of propagation of the incident wave. (a) A mode; (b) B mode; (c) C mode; (d) D mode