Abstract
Metasurface (MS) can manipulate the transmission of electromagnetic (EM) wave with more degrees of freedom than other conventional radar stealth material, enabling numerous potential applications in both military and civilian fields. In this paper, we propose two kinds of polarization converters to reveal the relation between phase gradient and linear/circular polarization conversion (LPC/CPC). The proposed split square-ring (SSR) and split circle-ring (SCR) converters both can realize the CPC with different mechanisms. Further, four kinds of digital MSs are designed to explore the energy scattering characteristics. We find that the efficient radar cross section (RCS) reduction of the 01/01-typed SSR converter is due to the 180° phase gradient of reflected x - and y -polarized waves; the RCS reduction of the 01/10-typed SCR converter depends on the phase difference of u - and v -polarized waves and the amplitudes of x - and y -polarized waves. The calculation and the simulation results verify the relevance between RCS reduction and reflection amplitude, the reason of insufficient RCS reduction is fully explained. The experiments match well with the simulations. This work can be useful for the exploration of polarization conversion MSs and build the connection between reflection loss and RCS reduction. • The relationship between phase modulation and linear/circular polarization conversion. • The method to achieve circular polarization conversion with different mechanisms. • Optimizing the defects of RCS reduction. • Associating the relation between reflection loss and RCS reduction based on phase manipulation.
Published Version
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