CYLINDRICAL ANISOTROPIC METASURFACES WITH PANCHARATNAM-BERRY PHASE BIGRADIENT HELICAL CODING AND ANOMALOUS SCATTERING

Scattering characteristics of anisotropic cylindrical phase-gradient metasurfaces (MSs) with various helical Pancharatnam-Berry phase (PB-phase) coding are studied. The efficiencies the scattering field reduction circularly polarized (CP) waves in forward half-space is compared for three different MS models same PB-phase gradient azimuthal direction and gradients axial direction. conformally located on semi-cylindrical metallic polyhedral prisms. meta-particles form triple coupled split-ring resonators. Spiral unit cells directions carried out by rotation meta-particles. effect constant frequency backscattered fields bistatic diagrams CP-waves meridional planes numerically estimated. It shown that causes more efficient anomalous co- cross-polarized CP-waves. leads to deviation intense diffraction lobes from normal plane a large angle, shift plane. Bigradient MSs provide at least 10 dB band 10-12 GHz 18.5 almost entire sector angles up ±45°