Low Reflectivity Ultrawideband and High-Efficiency Linear Polarization Converter

This paper proposes a metasurface with ultra-broadband, low reflectivity, and high polarization rotation efficiency (PRE). The proposed metasurface is consisted of three layers of metal patches and four dielectric layers. By adding another medium with a dielectric constant close to 1 between the two layers of Rogers RT5880 medium, the reflectivity below -10dB and the PRE above 99% are finally achieved in the range of 6-16GHz (the relative bandwidth is 90.9%). Compared to published designs, the proposed polarization converter can efficiently convert the linear polarization of broadband electromagnetic (EM) waves while maintaining low reflectivity.