Abstract
This letter presents the design of aperiodic sunflower-like metasurface for circularly polarized (CP) wave diffusion and radar cross-section (RCS) reduction using Pancharatnam–Berry (PB) meta-atoms. The distribution of the PB meta-atoms across the metasurface aperture is nonuniform and has a distribution inspired by sunflower seeds, i.e., an outwardly logarithmic spiral lattice with no transitional periodicity. The proposed metasurface has 600 PB meta-atoms of subwavelength size of 5 mm a 0.33λ20GHz and exhibits a randomly chosen diffusive reflection phase between 0° and 360°. Both simulated and experimental results demonstrate that the proposed sunflower-like metasurface can efficiently diffuse the backscattered energy into numerous directions when normally illuminated by a CP wave with RCS reduction >7 between 16 and 23.8 GHz. Furthermore, the low-level diffuse scattering can be preserved under oblique incidence up to 60°. As a result of using this PB concept, the polarization sensitivity of the proposed metasurface is released, and this is highly desired in applications when the polarization of the incoming wave is unknown.
Highlights
M anipulation of electromagnetic waves using metasurfaces has been a hot topic in recent years [1]-[8]
Important questions include whether this periodic arrangement is always the best option and whether it is possible to design metasurfaces with aperiodic distribution of meta-atoms to achieve elegant diffusion characteristics for circularly polarized (CP) waves
All PB meta-atoms exhibit a randomly chosen diffusive reflection phase between 0o and 360o. Both simulated and experimental results demonstrate that the proposed sunflower-like metasurface can efficiently diffuse the backscattered energy with radar cross section (RCS) reduction of a metallic plate
Summary
M anipulation of electromagnetic waves using metasurfaces has been a hot topic in recent years [1]-[8]. In [2]-[8], a chessboard and checkerboard like metasurfaces for RCS reduction were proposed using two kinds of meta-atoms exhibiting an 180o±25o phase difference between their absolute reflection phases. Such kind of surfaces suffers from strong scattering in certain directions and degraded scattering. Important questions include whether this periodic arrangement is always the best option and whether it is possible to design metasurfaces with aperiodic distribution of meta-atoms to achieve elegant diffusion characteristics for circularly polarized (CP) waves. All PB meta-atoms exhibit a randomly chosen diffusive reflection phase between 0o and 360o Both simulated and experimental results demonstrate that the proposed sunflower-like metasurface can efficiently diffuse the backscattered energy with RCS reduction of a metallic plate
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