Low cross-polarization reflectarray elements with four axial symmetry for dual-polarization and wideband use

This paper proposes novel reflectarray elements with four axial symmetry (including axial and rotational symmetry) for dual-polarization and wideband use. These elements provide reflection phase range of 360° over the wide frequency range by changing their shapes, and also have low cross polarization properties. We design an offset feed reflectarray constructed by the proposed elements in the Ku-band, and its effectiveness is verified by comparing radiation patterns between the calculated and the measured values.