A Broad Band Polarization Converting Metasurface for C and X-Band Applications

摘要

A metasurface with broadband polarization conversion is presented in this paper. The proposed reflective polarization converter unit cell is designed with a metallic pattern of square ring resonators (SRRs) over a dielectric substrate (Rogers R04003). This presented converter can achieve a 90° linear polarization at three operational frequencies and pure circular polarized transformation at two resonant frequencies. The mechanism of polarization conversion of the presented surface is studied through the analysis of the surface current distribution at three resonant frequencies, i.e., 5.9 GHz, 7.6 GHz, and 9.6 GHz. Simulations are performed and the results show that the presented converter under normal incidence achieves a polarization conversion ratio of 93% for broadband polarization conversion within a bandwidth of 4.4 GHz (5.6 GHz-10 GHz), which covers the C-band and a portion of the X-band. Consequently, the designed converter can be used for linear and circular polarization conversion applications in the C and X-bands.