Abstract
The design of flat Pancharatnam-Berry (PB) metasurfaces (MSs) with low RCS using the generation of a scattered vortex wave with orbital angular momentum (OAM) is considered. MS unit cells contain triple coupled split-ring resonators with a constant initial tilt angle of 45 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sup> . The influence of the sizes of such OAM-modules of the MS on the scattering diagrams of normally incident circular-polarized waves and the generation of a vortex beam with first-order OAM is studied. The simulation showed that the reduction in backscattering along the axis of the vortex beam from the OAM-module with a size of 40× 40 mm is at least 10 dB for cross-polarized wave in the band 11.1 to 19 GHz. Also, mono-and bistatic scattering diagrams of an MS fragment in the form of a 2× 2-lattice of four identical OAM-modules are studied. The OAM effect provides the reduction in the backscattering RCS by 10 dB for a lattice when it is irradiated with a linearly polarized wave in the band 11.4 to 19.2 GHz.
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