An Ultra-Thin X-band Metasurface-Based Transmittive-Type Linear to Circular Polarization Converter

Abstract

In this manuscript, an ultra-thin (~λ/18.75), transmittive-type linear to circular (LTC) electromagnetic wave polarization converter in X-band employing metasurface (MS) has been reported. The proposed MS-based LTC polarization converter consists of two mirrored L-shaped structure and a thin strip designed over the top surface of 1.6 mm thick FR4 substrate while meander structure has been designed on the bottom side of the substrate. Numerical simulation results show the conversion of 45° linearly polarized incident wave into circularly polarized transmitted wave having axial ratio (AR) less than 3-dB over the frequency range 7.42–12.00 GHz; thereby yielding fractional bandwidth of 47.02% under normal incidence. © 2021, Springer Nature Singapore Pte Ltd.