An Ultrathin Multifunctional Polarization Converting Metasurface with Wide Angular Stability

Abstract

Polarization converter is a device which can change the polarization state of the electromagnetic wave for several applications like satellite communication, Radar Stealth applications. In this work, a multifunctional polarization converter on an ultrathin metasurface for simultaneous linear to circular (L-t-C) and linear to linear (L-t-L) polarization conversion is proposed for microwave frequency region applications. The unit cell geometry of the anisotropic metasurface comprises of diagonal fence-shaped structure on the top of the thin dielectric substrate, whereas a continues metallic layer is printed on the back of the substrate. The proposed metasurface demonstrates a highly efficient linear to linear polarization conversion over the frequency band of 6.27–6.56 and 9.18–9.82 GHz. On the other hand, simultaneously, it converts linear polarization to circular polarization over the frequency bands of 6.00–6.17, 6.71–8.93, 10.03–10.52 GHz frequency. The theoritical mechanism of the polarization conversion is explained here through surface current distribution and u-v phase response analysis. Moreover, the proposed metasurface shows relatively stable performance under high oblique incidence up to $45^o$ angle of incidence for several practical applications like multi-polarization communication devices, radar cross section reduction.