Abstract
A coding diffusion metasurface is designed and fabricated for ultra-wideband radar cross-section (RCS) reduction. Two kinds of unit cells based on square ring patch are employed to generate the `0' and `1' elements of the coding metasurface. By precise design of the unit cells, a 180° ± 37° reflection phase difference between these cells is achieved over 8.01-22.76 GHz, leading to dramatically reduce the scattering field level by more than 10 dB. To obtain the diffusion far-field pattern of the metasurface, the optimisation algorithm is utilised to calculate the optimal layout of the digital elements. Both full-wave simulation and measurement results verify the capability of the proposed metasurface.
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