Abstract
A broadband and polarization-independent metasurface is analyzed and designed for both monostatic and bistatic radar cross section (RCS) reduction in this paper. Metasurfaces are composed of two types of electromagnetic band-gap (EBG) lattice, which is a subarray with “0” or “π” phase responses, arranged in periodic and aperiodic fashions. A new mechanism is proposed for manipulating electromagnetic (EM) scattering and realizing the best reduction of monostatic and bistatic RCS by redirecting EM energy to more directions through controlling the wavefront of EM wave reflected from the metasurface. Scattering characteristics of two kinds of metasurfaces, periodic arrangement and optimized phase layout, are studied in detail. Optimizing phase layout through particle swarm optimization (PSO) together with far field pattern prediction can produce a lot of scattering lobes, leading to a great reduction of bistatic RCS. For the designed metasurface based on optimal phase layout, a bandwidth of more than 80% is achieved at the normal incidence for the −9.5 dB RCS reduction for both monostatic and bistatic. Bistatic RCS reduction at frequency points with exactly 180° phase difference reaches 17.6 dB. Both TE and TM polarizations for oblique incidence are considered. The measured results are in good agreement with the corresponding simulations.
Highlights
The reflection phase control for EM wave impinging on a surface is important in both fundamental EM researches and device technologies
A new mechanism is proposed for manipulating EM scattering and realizing monostatic and bistatic radar cross section (RCS) reduction through optimizing reflection phase
More than 80% frequency bandwidth with both monostatic and bistatic RCSs reductions larger than 9.5 dB is obtained by optimized phase layout
Summary
The reflection phase control for EM wave impinging on a surface is important in both fundamental EM researches and device technologies. More than 55% frequency bandwidth with a monostatic RCS reduction larger than 10 dB is obtained and four scattered beams are produced In another similar work [7], two-dimensional phase gradient metasurfaces of a chessboard-like configuration have been proposed for wideband RCS reduction. The −5 dB RCS reduction bandwidth of 66% is achieved for TE and TM polarizations at the normal incidence For those rectangular checkerboard surfaces with periodic arrangement, four scattering beams are produced and bistatic RCS reduction is about 8.1 dB. International Journal of Antennas and Propagation et al proposed a metasurface with nonuniform phase distribution for suppression of specular reflections, with the −7 dB RCS reduction bandwidth of about 42% for y-polarized and x-polarized incident waves. (6) Specular reflection and bistatic RCS for oblique incidence with TE and TM polarization can be effectively suppressed
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