Abstract
In this paper, a 4-bit reflective coding metasurface with the polarization-insensitive unit cell is designed for wideband radar cross section (RCS) reduction. The metasurface unit has rotational symmetry; therefore, it produces the same electromagnetic scattering response for both xand y-polarizations. To attain 4-bit phase response, the dimensions of the unit cell are optimized so that a phase difference of 22.5° is realized between respective digital elements and the magnitude of reflection is more than 0.95 from 15 GHz to 40 GHz. Therefore, 16 digital elements have phases of θ, θ + 22.5°, θ + 45°, θ + 67.5°, θ + 90°, θ + 112.5°, θ + 135°, θ + 157.5°, θ + 180°, θ +202.5°, θ +225°, θ +247.5°, θ +270°, θ +292.5°, θ +315°, and θ + 337.5°. Discrete water cycle algorithm (DWCA) is applied to the array factor to get the optimal coding sequence matrix for better RCS reduction. The coding metasurface can achieve more than 10 dB RCS reduction from 15 GHz to 40 GHz as compared with the same size of a copper sheet. The simulation and experiment results validate the ability of proposed coding metasurface for robust control of EM-wave and wideband RCS reduction.
Highlights
With the rapid advancements of defense electronics, the demand for stealth technology is increased drastically in recent years
Discrete water cycle algorithm is applied to array factor to get the optimal coding sequence matrix for a better radar cross section (RCS) reduction
A 4-bit reflective coding metasurface with the polarizationinsensitive unit cell is presented for wideband radar cross section (RCS) reduction
Summary
With the rapid advancements of defense electronics, the demand for stealth technology is increased drastically in recent years. Several designs of the artificial magnetic conductor (AMC) with unit cells having opposite phase responses are designed in chessboard arrangement to cancel the specular reflection, and as a result, the radar cross section (RCS) has been reduced [20]–[22]. For better RCS reduction, the optimized metasurface arrangements are introduced in [27]–[30] by using 1-bit coding metasurface. A 4-bit reflective coding metasurface with the polarization-insensitive unit cell is presented and characterized for wideband radar cross section (RCS) reduction. To achieve a 4-bit phase response, the size of the unit cell is optimized so that a phase difference of 22.5◦ is realized between respective digital elements. Discrete water cycle algorithm is applied to array factor to get the optimal coding sequence matrix for a better RCS reduction. The simulation and experiment results validate the ability of the proposed coding metasurface for robust control of EM-wave and wideband RCS reduction
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