Design of A Dual-Polarized Unit-Cell for Wideband Reflectarrays

In this article, a dual-polarized unit-cell for wideband refletarrays is presented. By tuning the slot length of the structure, a linear phase for both polarizations can be achieved. An offset-fed reflectarray containing 506 proposed elements for each polarization is designed. Simulations exhibit that the reflectarray antenna features a wide 1-dB gain bandwidth of 32% and 31% for horizontal and vertical polarization, respectively. Satisfactory sidelobe and cross-polarization behavior is also obtained for both polarizations.