Fig. 1. Unit cell of proposed polarization conversion metasurface: (a) three-dimensional (3D) view, and (b) top view.

Fig. 2. Simulated results of proposed polarization conversion metasurface undeer y-polarized normal incidence: (a) phase difference Δ φ_yx between r_xy and r_yy and (b) magnitude of r_xy and r_yy.

Fig. 3. Axial ratio of reflected wave under y-polarized normal incidence.

Fig. 4. (a) LTC reflection coefficients and (b) polarization conversion rate (PCR) of proposed polarization conversion metasurface under y-polarized normal incidence.

Fig. 5. Intuitive schematic diagram of phase difference between co- and cross-polarization reflection coefficients under x- and y-polarized incidences.

Fig. 6. Simulated results of proposed polarization conversion metasurface under u- and v-polarized normal incidences: (a) phase difference between r_uu and r_vv, (b) magnitudes and (c) phases of r_uu and r_vv, (d) axial ratio (AR) of the reflected wave.

Fig. 7. (a) Photographs of experimental sample, (b) schematic diagram of measurement setup, and (c) measured results: axial ratio (AR) of reflected wave under x- and y-polarized incidences.