access icon free RCS reduction for grazing incidence based on coding metasurface

© The Institution of Engineering and Technology
Received 27/06/2017, Published 11/09/2017

A coding metasurface is proposed for reducing radar cross section (RCS) under grazing incidence. Two elements with different reflection phases are selected for the metasurface, and 7 × 7 artificial magnetic conductor unit cells are utilised to construct a metamaterial block. Then the arrangement of blocks is optimised by particle swarm algorithm (PSA). The phase difference between two elements contributes to RCS reduction under grazing incidence. The obtained results demonstrate that a wideband RCS reduction is achieved by the coding metasurface ranging from 6 to 13 GHz. In addition, the monostatic RCS reduction is also achieved under a grazing incidence. For x-polarised incidence, the monostatic RCS reduction is >6 dB from 77° to 90°. For y-polarised incidence, the monostatic RCS reduction is >6 dB from 69° to 80°, and the maximum reduction is 17.5 dB under the 75° incident angle.

Inspec keywords: microwave metamaterials; encoding; particle swarm optimisation; frequency selective surfaces; radar cross-sections

Other keywords: monostatic RCS reduction; artificial magnetic conductor unit cell; wideband radar cross section reduction; metamaterial block; particle swarm algorithm; coding metasurface; x-polarised incidence; wideband RCS reduction; frequency 6 GHz to 13 GHz; PSA; grazing incidence; gain 17.5 dB; y-polarised incidence

Subjects: Radar theory; Codes; Optimisation techniques; Artificial electromagnetic wave materials and structures; Metamaterials and structures (microwave)

References

    1. 1)
    2. 2)
      • 2. Wang, K., Zhao, J., Cheng, Q., et al: ‘Broadband and broad angle low-scattering metasurface based on hybrid optimization algorithm’, Sci. Rep., 2014, 4, (5935), pp. 1–9.
    3. 3)
      • 4. Zhao, Y., Cao, X., Gao, J., et al: ‘Broadband diffusion metasurface based on a single anisotropic element and optimized by the simulated annealing algorithm’, Sci. Rep., 2016, 6, (23896), pp. 1–9.
    4. 4)
    5. 5)
      • 3. Dong, D.-S., Yang, J., Cheng, Q., et al: ‘Terahertz broadband low-reflection metasurface by controlling phase distributions’, Adv. Opt. Mater., 2015, 156, pp. 1–6.
    6. 6)
      • 6. Zheng, Q., Li, Y., Zhang, J., et al: ‘Wideband, wide-angle coding phase gradient metasurfaces based on Pancharatnam–Berry phase’, Sci. Rep., 2016, 7, (43543), pp. 1–13.
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