An Equivalent Circuit Model of FSS-Based Metamaterial Absorber Using Coupled Line Theory

Ghosh, Saptarshi; Srivastava, Kumar Vaibhav

doi:10.1109/lawp.2014.2369732

Cited by 151 publications

(61 citation statements)

References 15 publications

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“…Many literatures apply this theory to analyze the mechanism of MMA. [15][16][17][18][19][20] Although some researchers utilized such theory to study the interaction between the resonator and ground plane, 18-20 most of the previous works only qualitative explanation of impedance theory is proposed. 11 Until now, little attentions have been paid on the spacer thickness and oblique incidence in the previous literatures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of single-layer metamaterial absorber with reflection theory

Xiong

Tang

Hong

2015

Journal of Applied Physics

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A reflection theory is employed to analyze a single-layered metamaterial absorber. With the necessary conditions for zero reflection, the permittivity and permeability as functions of absorptivity were obtained, which are suitable for analyzing the absorption properties of single-layered metamaterial absorber at both normal and oblique incidence cases. With the obtained expressions, it not only can explain why the absorption peaks monotonously decrease with increasing of the incident angles but also can explore the relationship between the absorptivity and spacer thickness of the dielectric slab. A Jerusalem cross metamaterial absorber was simulated and verified the validity of this proposed reflection theory. The main contribution of our work is that it can explain the physical mechanism of the various absorption peaks by using the analytical formula and highlights its potential guidance for designing and analyzing metamaterial absorbers in the future.

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Section: Introductionmentioning

confidence: 99%

Analysis of single-layer metamaterial absorber with reflection theory

Xiong

Tang

Hong

2015

Journal of Applied Physics

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“…5(c), respectively. This strong electromagnetic coupling is mainly responsible for high absorption according to the theory explained in [25]. At the higher resonance frequency of 6.33 GHz, outer edge (having dimension 'L') of the structure is the main contributor; however, four circular slots contribute high magnetic resonance at this frequency due to high dielectric loss.…”

Section: Resultsmentioning

confidence: 94%

A Wideband Wide-Angle Ultra-Thin Metamaterial Microwave Absorber

Sood¹,

Tripathi²

2015

PIER M

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Abstract-A novel design of wideband, ultra-thin, wide-angle metamaterial microwave absorber has been presented. The unit cell of the proposed structure is designed by using parametric optimization in such a way that absorption frequencies come closer and give wideband response. For normal incidence, the simulated FWHM bandwidth of the proposed structure is 1.94 GHz, i.e., from 5.05 GHz to 6.99 GHz and −10 dB absorption bandwidth is 1.3 GHz from 5.27 GHz to 6.57 GHz. The proposed structure has been analyzed for different angles of polarization, and it gives high absorption (more than 50%) for oblique angles of incidence up to 60 • . The designed absorber is in low profile with a unit cell size of λ 0 /6 and ultrathin with a thickness of λ 0 /32 at the center frequency of 5.92 GHz corresponding to 10dB absorption bandwidth. The current and electromagnetic field distributions have been analyzed to understand the absorption mechanism of the absorber. An array of the proposed absorber has been fabricated and experimentally tested for various polarization angles and oblique incidences of electromagnetic wave. The proposed absorber is well suited for surveillance and other defense applications.

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“…In Table 2, the absorption characteristics of the thin absorbers in [12][13][14][15] are compared with those theoretically expected by the proposed design method. Except for the case of [15] in which the measured bandwidth of 7% is wider than 5.7%, the bandwidth characteristics of the rest are shown to be at best comparable with or even far worse than those of the presented simple RC absorbers although diversified structures have been employed.…”

Section: Fabrication and Measurementsmentioning

confidence: 99%

Design of Thin RC Absorbers Using a Silver Nanowire Resistive Screen

Lee¹,

Lee²

2016

Journal of electromagnetic engineering and science

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A resistive and capacitive (RC) microwave absorber with a layer thickness less than a quarter of a wavelength is investigated based on closed-form design equations, which are derived from the equivalent circuit of the RC absorber. The RC absorber is shown to have a theoretical 90% absorption bandwidth of 93% when the electrical layer thickness is 57 o (about λ 0/6). The trade-offs between the layer thickness and the absorption bandwidth are also elucidated. The presented formulation is validated by a design example at 3 GHz. The RC absorber is realized using a silver nanowire resistive rectangular structure with surrounding gaps. The measured 90% absorption bandwidth with a layer thickness of λ 0/8 is 76% from 2.3 GHz to 5.1 GHz in accordance with the theory and EM simulations. The presented design methodology is scalable to other frequencies. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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An Equivalent Circuit Model of FSS-Based Metamaterial Absorber Using Coupled Line Theory

Cited by 151 publications

References 15 publications

Analysis of single-layer metamaterial absorber with reflection theory

Analysis of single-layer metamaterial absorber with reflection theory

A Wideband Wide-Angle Ultra-Thin Metamaterial Microwave Absorber

Design of Thin RC Absorbers Using a Silver Nanowire Resistive Screen

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