Broadband and Tunable RCS Reduction using High-order Reflections and Salisbury-type Absorption Mechanisms

Jiakun Song,Cheng Huang,Chen Ji,Xiaoyu Wu,Jianing Yang,Xiangang Luo,Changlei Zhang

doi:10.1038/s41598-019-45501-8

Abstract

In this paper, a broadband and tunable radar cross section (RCS) reduction structure is proposed by using the hybrid physical mechanism that is based on high-order reflections and Salisbury-type absorption. Our design combines the high-index grating structure with a traditional Salisbury screen in which the lossy sheet is made of a graphene structure. When it is illuminated by a plane wave with normal incidence, the Salisbury screen can absorb the incoming wave, and the introducing high-index grating structure could further reduce the backward scattering wave by generating high-order reflection beams, which broadens the RCS reduction bandwidth. In addition, the RCS reduction level can be dynamically controlled by tuning the surface resistance of the graphene layer. Simulated results show that the proposed structure can realize tunable RCS reduction between 4.1 and 18 GHz under normal incidence with different graphene resistances. Experimental results are in accordance with those of the simulation results. In addition, the scattering field distributions and the plots of surface power loss density have been illustrated to analyze the RCS-reduction mechanism of our structure.

Highlights

Some tunable radar cross section (RCS) reduction methods have been proposed to dynamically manipulate the reflected wave
We propose a novel broadband and tunable RCS reduction method by simultaneously introducing absorptive loss and radiative loss in the design
The fabricated graphene structure is used as the lossy sheet of Salisbury screen, while the high-index grating structure is made of aluminum oxide

Summary

Absorption Mechanisms

Jiakun Song[1], Xiaoyu Wu1, Cheng Huang[1], Jianing Yang[1,2], Chen Ji1,2, Changlei Zhang1,2 & Xiangang Luo[1]. A broadband and tunable radar cross section (RCS) reduction structure is proposed by using the hybrid physical mechanism that is based on high-order reflections and Salisbury-type absorption. Our design combines the high-index grating structure with a traditional Salisbury screen in which the lossy sheet is made of a graphene structure When it is illuminated by a plane wave with normal incidence, the Salisbury screen can absorb the incoming wave, and the introducing high-index grating structure could further reduce the backward scattering wave by generating high-order reflection beams, which broadens the RCS reduction bandwidth. Simulated results show that the proposed structure can realize tunable RCS reduction between 4.1 and 18 GHz under normal incidence with different graphene resistances. The hybrid physical mechanisms are explained by examining the scattering field distributions and surface power loss density

Results

Discussion

Author Contributions

Additional Information