Dual-band dual-polarization reflectarray design with a large offset feed angle

In this paper, a dual-band, dual-polarization reflectarray with a large offset feed angle is designed, manufactured and measured. Elements of this reflectarray are composed of a combination of split cross and rectangle rings for one polarization at 12.5GHz and double split square rings for another polarization at 14.25GHz. In our design, the focus length of a 650 mm square offset-fed reflectarray is chosen as 488 mm which means that the maximum incident angle of the element is up to 53 deg. This reflectarray has good focusing properties. Measured sidelobe level is -16dB at 12.5GHz and -13.5dB at 14.25GHz.