Broadband ultrathin low-profile metamaterial microwave absorber

Sood, Deepak; Tripathi, C. C.

doi:10.1007/s00339-016-9884-2

Cited by 45 publications

(17 citation statements)

References 20 publications

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“…[11][12][13][14] Nowadays, wideband absorption with ultra-thin structure is essential in many metamaterial absorber applications. Thus, metamaterial absorber with multi-layer, 15,16 multiresonant, 17,18 and single layer [19][20][21][22][23][24][25][26] structures have been proposed for wideband absorption. Although, multilayer and multiresonant structures provide wideband absorption, they suffer from thickness and large size, respectively.…”

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confidence: 99%

A compact ultra‐thin ultra‐wideband microwave metamaterial absorber

Ramya

Rao

2017

Micro & Optical Tech Letters

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This study presents a new, ultra‐thin compact microwave metamaterial absorber for wideband applications. The proposed metamaterial absorber comprises an outer ring and inner split ring patches on the upper surface and metallic ground in the bottom surface. A dielectric FR4 substrate of thickness 1.6 mm was placed between the top patch and the bottom ground. The designed structure was ultra‐thin of λ0/13.9 thickness with respect to the centre frequency of the bandwidth. The simulation results showed ultra‐wideband absorption of 6.31 GHz from 10.36 to 16.67 GHz above 85% absorptivity, and peaks at 11.1, 13.2, 14.4 ,and 16.2 GHz and full width half maximum of 9.6 GHz. The mechanism of absorption for the proposed ultra‐wideband metamaterial absorber was studied. Also, the polarization behavior was tested under oblique and normal angles of incidence for transverse electric polarization. Due to its asymmetrical design, the proposed structure is polarization sensitive. The designed structure was fabricated and measured, and the practical results were in good agreement with the simulation results.

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confidence: 99%

A compact ultra‐thin ultra‐wideband microwave metamaterial absorber

Ramya

Rao

2017

Micro & Optical Tech Letters

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“…The fundamental challenges in implementation of single layer MM‐based absorbers are single‐band absorption, narrow bandwidth, polarization sensitivity, etc. The stacking of multiple layers and combination of multiple resonators in a unit cell has been employed in order to design multi band and broadband absorbers . The combination of both stacking and combining multiple resonators in a unit cell has also been validated to achieve broadband absorption response .…”

Section: Introductionmentioning

confidence: 99%

“…The stacking of multiple layers 28,29 and combination of multiple resonators 30,31 in a unit cell has been employed in order to design multi band [31][32][33][34] and broadband absorbers. 35 The combination of both stacking and combining multiple resonators in a unit cell has also been validated to achieve broadband absorption response. 36 Recent research has emphasis on the wearable, ultrathin and polarization insensitive absorbers.…”

Section: Introductionmentioning

confidence: 99%

Triple band ultrathin polarization insensitive metamaterial absorber for defense, explosive detection and airborne radar applications

Dhillon

Mittal

Bargota

2018

Micro & Optical Tech Letters

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We demonstrate an ultrathin polarization insensitive metamaterial‐based Concentric Closed Circular Ring Resonator (CCCRR) perfect absorber for explosive detection, bolometer, indoor radar clear applications, thermal detection, defense applications, airborne and surveillance radar signal absorption applications. The unit cell incorporates three concentric closed circular ring resonators. A parametric optimization has been carried out in order to obtain three discrete absorption peaks at 5.57 GHz, 7.969 GHz, and 13.44 GHz exhibiting absorption intensities of 98.87%, 97.99%, and 99.28%, respectively. Owing to the geometrical symmetry, the structure is polarization insensitive for both TE and TM polarizations and has significant absorbance over a wide angle of incidence of 45° for TE and 75° for TM polarizations. The structure is very compact with physical dimensions of 0.185λo*0.185λo *0.01λo, λo is wavelength corresponding to lower absorption peak. The thickness of the proposed structure is λo/100, evidencing the ultrathin characteristic of the proposed structure. The insight of absorption mechanism has been illustrated by analyzing the electric field distribution, power loss density, and normalized impedance. An extensive parametric analysis has been exercised to examine the influence of parametric alterations.

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“…FSS often suffer from a narrow bandwidth (high quality factor because of their resonant structures). In order to enlarge the bandwidth, two popular techniques used, consists of incorporating resonating elements working at nearby frequencies by arranging them on the same plane [14,15] or by using multi layers [16,17] at the expense of a drop in the absorption at certain frequencies in the bandwidth and/or bulkiness. Genetic algorithms [18] and software based optimizations are also used to obtain broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis for Systematic Design of Flexible Broadband Radar Absorbers Using the Least-Square Method

Beeharry¹,

Selemani²,

Ouslimani³

2018

PIER C

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By taking into account the facts that thick dielectrics are required for low frequency absorbers, that thick dielectrics are not always flexible, and that targets are not always planar, an efficient tool for the systematic design of flexible broadband radar absorbers using the least-square method is presented in this paper. Two approaches for designing the physical model of the absorber are presented. The first one consists of resistive square loops deposited on top of a dielectric, and the second one consists of metallic square loops associated with lumped resistors. More than 90% of absorption rate is obtained in the required bandwidth for both transverse electric and transverse magnetic polarizations with the two approaches and achieving a performance of operational bandwidth to thickness ratio of 7.69. Finally, the required dimensions of flexible absorbers in some low frequency bands are given in order to show the versatility of the approach.

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Broadband ultrathin low-profile metamaterial microwave absorber

Cited by 45 publications

References 20 publications

A compact ultra‐thin ultra‐wideband microwave metamaterial absorber

A compact ultra‐thin ultra‐wideband microwave metamaterial absorber

Triple band ultrathin polarization insensitive metamaterial absorber for defense, explosive detection and airborne radar applications

Theoretical Analysis for Systematic Design of Flexible Broadband Radar Absorbers Using the Least-Square Method

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