Fig. 1. (a) Sketch view and (b) unit cell of the proposed multifunctional device.

Fig. 2. (a) Scheme of the dual-band EIT and linear-to-circular polarization converter. (b) Transmission curves for the metasurface with the double L (black solid), the small L (blue dotted), and the large L (red dashed) shapes when VO₂ is in the insulating state. The cross symbol denotes the fitted result based on the “two-particle” model. (c) The surface current distribution at the two transmission peaks.

Fig. 3. (a) Reflection of R_yy and R_xy. (b) The phase and phase difference for the reflection of R_yy and R_xy. (c) The calculated ellipticity of the polarization conversion.

Fig. 4. Sketch map of the planar-array antenna and elements of each column.

Fig. 5. (a) Transmission and (c) phase of cross polarization for VO₂ in the insulating state. (b) Reflection and (d) phase of co-polarization for VO₂ in the metallic state.

Fig. 6. (a) Three- and (b) two-dimensional radiation pattern of the reflected beam. (c) Three- and (d) two-dimensional radiation pattern of the transmitted beam for VO₂ in the insulating state.

Fig. 7. (a) Three- and (b) two-dimensional radiation pattern of the reflected beam when VO₂ is in the metallic state.

Table 1. Parameters of EIT and Polarization Converter^a

Table 2. Parameters of Planar-Array Antenna^a