Metasurface base on uneven layered fractal elements for ultra-wideband RCS reduction

Authors

Jianxun Su, Communication University of China
Yueyang Cui, Communication University of China
Zengrui Li, Communication University of ChinaFollow
Yaoqing (Lamar) Yang, University of Nebraska - LincolnFollow
Yongxing Che, Electromagnetic Scattering Laboratory
Hongcheng Yin, Electromagnetic Scattering Laboratory

Document Type

Article

Date of this Version

2018

Citation

AIP ADVANCES 8, 035027 (2018)

Comments

© Author(s) 2018.

https://doi.org/10.1063/1.5013106

Abstract

A novel metasurface based on uneven layered fractal elements is designed and fabricated for ultra-wideband radar cross section (RCS) reduction in this paper. The proposed metasurface consists of two fractal subwavelength elements with different layer thickness. The reflection phase difference of 180^◦ (±37^◦) between two unit cells covers an ultra-wide frequency range. Ultra-wideband RCS reduction results from the phase cancellation between two local waves produced by these two unit cells. The diffuse scattering of electromagnetic (EM) waves is caused by the randomized phase distribution, leading to a low monostatic and bistatic RCS simultaneously. This metasurface can achieve -10dB RCS reduction in an ultra-wide frequency range from 6.6 to 23.9 GHz with a ratio bandwidth (fH/fL) of 3.62:1 under normal incidences for both x- and y-polarized waves. Both the simulation and the measurement results are consistent to verify this excellent RCS reduction performance of the proposed metasurface.