Radar cross section reduction metasurface based on random phase gradients
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In this paper, we design a novelty metasurface for achieving radar cross section (RCS) reduction. The proposed metasurface can achieve phase difference by rotating its unit cells to different rotating angles as traditional Pancharatnam–Berry (P–B) phase. However, compared with traditional P–B phase metasurface, the unit cells of this proposed metasurface do not possess certain period, it indicates that random phase gradients can easily produce on this proposed metasurface. The direction and the scalar of these produced random phase gradients are all random, and the incident waves can be diffused by these random phase gradients, realizing wideband, wide angle, polarization-independent RCS reduction. The design of units without fixed period increases the freedom of controlling electromagnetic wave. Both the simulation and experiment show that the proposed metasurface is valuable for stealth technology.
The authors are grateful to the supports from the National Natural Science Foundation of China under Grants 61471292, 61331005, 61471388.