An Ultra-wideband and Polarization-independent Metasurface for RCS Reduction

et al. 2017

Sci Rep

126

In this work, a broadband and broad-angle polarization-independent random coding metasurface structure is proposed for radar cross section (RCS) reduction. An efficient genetic algorithm is utilized to obtain the optimal layout of the unit cells of the metasurface to get a uniform backscattering under normal incidence. Excellent agreement between the simulation and experimental results show that the proposed metasurface structure can significantly reduce the radar cross section more than 10 dB from 17 GHz to 42 GHz when the angle of incident waves varies from 10° to 50°. The proposed coding metasurface provides an efficient scheme to reduce the scattering of the electromagnetic waves.

mentioning

confidence: 99%

Broadband and Broad-angle Polarization-independent Metasurface for Radar Cross Section Reduction

Sun

et al. 2017

Sci Rep

126

“…The symmetric split ring can motivate symmetric and antisymmetric modes on the surface of the structure, and the cut wire supports multi‐order modes, which are excited by electric‐field components . These modes can achieve multiple resonances in a wide band . The proposed unit cell has an asymmetric split ring, and this structure can expand the bandwidth of the PCM by adjusting the resonances.…”

Section: Design Of the Proposed Antennamentioning

confidence: 99%

A low scattering slot antenna based on broadband polarization conversion metasurface

Int J RF Microw Comput Aided Eng

Zhao

Xiang

et al. 2019

Self Cite

An ultrawide band polarization conversion metasurface (PCM) is proposed to reduce the reflection of a slot antenna. The proposed PCM can convert a linearly polarized incident wave to the reflected wave with a 90° rotation. By arranging the PCM around the antenna symmetrically, an ideal phase cancelation is achieved. To verify the design, a metasurface‐slot antenna is simulated and measured to confirm the proposed PCM for a significant reduction of the reflection. Results show that the normal reflection of the proposed antenna at boresight is reduced more than 10 dB over an ultrawide band. In addition, 2 dB enhancement of the gain is achieved compared with a reference antenna which has the same dimensions. Meanwhile, the small influence is observed for the antenna radiation by introducing the PCM.

“…Next, new AMCs structures to improve the bandwidth have been widely studied by the considerable researchers. Inspired by the concept of phased‐array antenna design, gradient metasurfaces or coding metasurfaces can reflect the incident wave in arbitrary desirable direction, which provide a new way to control the backscattering for RCS reduction. However, the method of RCS reduction using the phase gradient metasurfaces or coding metasurfaces is limited in part by complex fabrication process, limited controlability for piecewise phase gradient, difficult for implementation of small patterning elements.…”

Section: Introductionmentioning

confidence: 99%

Design of phase matching chessboard‐like electromagnetic metasurfaces for wideband radar cross section reduction

Micro & Optical Tech Letters

Shen

et al. 2019

In this article, a chessboard‐like electromagnetic metasurfaces which can realize the polarization compensation and cancellation of the reflection beam in microwave region is designed and realized for wideband radar cross section (RCS) reduction. The chessboard‐like electromagnetic metasurfaces are composed of a square annular artificial magnetic conductor (AMC) combination with the Jerusalem cross AMC. Simulation and experimental results demonstrate that the chessboard‐like electromagnetic metasurfaces exhibit significantly RCS reduction over −10 dB in the frequency bandwidths 6.16‐18 GHz, and two RCS reduction peaks at 7.0 and 12.0 GHz in the considering frequency ranges for the normal incidence of an electromagnetic wave. The physical mechanisms of the RCS reduction peaks can be elucidated by the phase matching technology similar to the impedance matching technology applied to radar absorbing materials (RAMs). The basic physical property implies that RCS reduction based on the composite AMC metasurfaces can be improved greatly by introducing as many phase matching points as possible in the functional frequency bands. Considered that the phase matching is a necessary condition rather than a sufficient condition for RCS reduction of the chessboard‐like AMCs structures, other physical mechanisms of RCS reduction are also discussed by far field distribution, near field distribution and the properties of mono‐static RCS reduction.