Recent developments of metamaterials/metasurfaces for RCS reduction

Abstract

In this paper, recent developments of metamaterials and metasurfaces for RCS reduction are reviewed, including basic theory, working principle, design formula, and experimental verification. Super-thin cloaks mediated by metasurfaces can cloak objects with minor impacts on the original electromagnetic field distribution. RCS reduction can be achieved by reconfiguring scattering patterns using coding metasurfaces. Novel radar absorbing materials can be devised based on field enhancements of metamaterials. When combined with conventional radar absorbing materials, metamaterials can expand the bandwidth, enlarge the angular range, or reduce the weight. Future tendency and major challenges are also summarized.

Polarization insensitive symmetrical structured double negative (DNG) metamaterial absorber for Ku-band sensing applications

“…DNG property of metamaterial depends on its structure, which empowers it for different use like absorbers 4 , 5 , antennas, SAR (specific absorption ratio) 6 , filters 7 , waveguides 8 , invisible clocks 6 , mobile applications 9 , polarization converters 10 , lenses 11 , THz optical applications 12 – 14 and different types of sensor 5 , 15 – 17 . After the first successful ascertainment of metamaterial absorber (MMA) properties, numerous studies are ongoing to design MMA for several applications like GPS positioning application 18 , noise reduction by improving MIMO antenna isolation 19 , reduction of radar cross-section 20 , stealth technology for military use 21 , underwater sound absorption 22 , cryptography 23 , thermal and wavelength selectable microbolometers 24 , cancer cell detection or biosensing 16 , 25 , 26 , imaging 27 , 28 and detection for explosive materials 29 . Usually, a three-layer model is used to design MMA.…”

A Review of Metasurface-Assisted RCS Reduction Techniques

“…The coding features for 1-, 2-, and multi-bit are designed based on the Pancharatnam-Berry phase. The expressions (11) and ( 12) provide the reflected wave direction based on the angle at which the incidence occurs, and the phase variation occurs along the x and y directions:…”

“…Appropriate design of the subwavelength scatterers and their placement in the array yields the desired outcomes, paving the way for a variety of applications. Several review papers such as [7][8][9][10][11][12] and [13] have comprehensively discussed metamaterials/metasurfaces (MTM/MTS) and their applications. Metasurfaces used for RCS reduction can be based on both scattering and absorption.…”

Wideband RCS reduction of thin metallic edges mediated by spoof surface plasmon polaritons

“…Note that spoof surface plasmon polariton (SSPP) is serving for wideband absorption by virtue of deep-subwavelength and strong local field enhancement properties [18]. The wideband absorption of periodically arranged SSPP framework has been introduced in several recent reference papers [19][20][21][22][23][24]. In this work, we expand on the previous publications to integrate a specific application scene, where an absorbing structure (AS) based on SSPP [24] is applied to realize the aim of wideband suppression of edge diffraction.…”