Ultra-wideband metasurface with linear-to-circular polarization conversion of an electromagnetic wave

This is the authors' abstract. We don't add key points for this paper.

An ultra-wideband metasurface with characteristics of linear-to-circular polarization conversion is proposed in this paper. By virtue of the metallic vias and multi-reflection, the proposed polarization convertor can convert the y (x) polarized electromagnetic (EM) wave to a circularly polarized one after reflection in an ultra-wide frequency band. Simulated results show that the proposed polarization convertor can perform nearly perfect linear-to-circular polarization conversion at five frequency points and achieve a 3-dB axial ratio (AR) in the frequency range of 4.7-21.7 GHz at normal incidence. Reasonable agreement between the experiments and simulations has been obtained. Due to the advantage of the scalable geometry of the proposed metasurface, it is a good candidate to be used for manipulating the polarization states of EM waves from radio to optical frequencies.