A Compact Ultrathin Ultra-wideband Metamaterial Microwave Absorber

Abstract

A simple design of compact ultra-wideband, ultra-thin metamaterial microwave absorber has been presented. The unit cell of the proposed design is composed of diagonally placed 'microstrip bend' like patches printed on grounded dielectric substrate. The simulation results demonstrate the 10-dB absorption bandwidth of 7.19 GHz from 10.45 GHz to 17.64 GHz and FWHM (full width at half maximum) bandwidth of 11.43 GHz from 9.61 GHz to 21.04 GHz. The proposed design presents more than 90% absorption for a bandwidth of 1.02 GHz at wide angle of incidence up to 60 0. The absorption mechanism has been analyzed through surface current and electromagnetic field distributions. The proposed design has been fabricated and experimentally tested for its 10-dB absorption bandwidth under different polarization and oblique angles of incidence of electromagnetic wave. The designed absorber is low profile (unit cell size is ~0.257 λ 0 at the center frequency corresponding to 10-dB absorption bandwidth), ultrathin (~λ 0 /14 thick at the center frequency) and provides a novel design of wideband absorber for many useful applications.

RETRACTED ARTICLE: Facile design of an ultra-thin broadband metamaterial absorber for C-band applications

“…However, the multilayer structure remains truly challenging. Therefore, many efforts have been carried out to find a simple MA structure having both wide bandwidth and good absorption performance for practical applications, e.g., single layer of L-shape 9 , modified L-shape 10,11 and circular split rings 12,13 structures as recently reported. Recently, loading with lumped elements on top surface of MA is proposed to extend the absorption band of such MAs 14–17 .…”

Toward an Ultra-Wideband Hybrid Metamaterial Based Microwave Absorber

“…The idea of a Metamaterial (MM) absorber was firstly proposed by Mosallaei et al [ 10 ], and the first MM was realized by Landy et al [ 11 ], in the gigahertz (GHz) domain. Since then, many studies have been conducted on MM for electromagnetic wave absorption in various frequency ranges, such as microwave [ 12 , 13 , 14 , 15 , 16 ], terahertz [ 17 , 18 ], infrared [ 19 ], and visible spectral region [ 20 , 21 , 22 ]. Additionally, today, MMs found their applications in different domains, such as radar cross section reduction [ 23 ], military target stealth missions [ 24 ], human exposure to electromagnetic fields protection [ 25 ], frequency tuning [ 26 ] telecommunication [ 27 ], and antenna gain enhancement [ 28 ].…”

X-band metamaterial absorbers based on reduced graphene oxide-silicon carbide-linear low density polyethylene composite

“…Extensive work has been performed on development of multiband and broadband MMA with changing MM's design, employing ultrathin resistive spacer sheets and MM design [9][10][11][12][13][14][15][16][17]. Mostly, the reported research on MMA are rigid dielectric substrates like FR4, silicon wafers and rigid metallic (Cu) back layers [18][19][20][21][22][23][24][25][26][27] and emphasize on meta material unit cell design with limited study on the role of dielectric spacer properties on microwave absorption. A flexible meta-material absorber consisting of linear low density polyethylene (LLDPE) substrate with circular rings unit cell made up of expanded graphite flakes was reported to show 98.9% absorption at 11.22 GHz with FWHM of 2.49% along with a reflection loss of À24.51 dB at 11.56 GHz with À10 dB bandwidth of 0.39 GHz (3.37%) [28].…”