The Design of A Single-Layer High-Gain Reflectarray Antenna with Polarization Conversion

In this paper, a single-layer high-gain reflectarray antenna with polarization conversion is presented. The proposed reflectarray element consists of a top metallic patch, a dielectric layer and a metallic ground. And the top metallic patch is asymmetric along the x-axis and y-axis, by varying patch size and flipping the top metallic patch 180° along x-axis, full 360° reflected phase coverage with low loss is achieved. Meanwhile, the element has performance of polarization conversion. The polarization of the incident wave and the reflected wave are orthogonal. Furthermore, a 20° offset-fed single-layer high-gain reflectarray with a square aperture is composed by 26 × 26 antenna elements (390 mm × 390 mm) is proposed. The simulated gain is 31.1 dBi @10.0 GHz, and the aperture efficiency is 60.6% @10.0 GHz. The simulated 1-dB and 3-dB gain bandwidth are 14.0% (9.4 GHz – 10.8 GHz) and 23.0% (8.9 GHz – 11.2 GHz) @10.0 GHz, respectively.