A carbon-nanotube-based frequency-selective absorber

D'Elia, U.F.; Pelosi, Giuseppe; Selleri, Stefano; Taddei, Ruggero

doi:10.1017/s1759078710000693

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…Radar absorbing materials (RAMs) significantly reduce an object's observable radar cross-section within specific bandwidths 32 . A Salisbury screen absorber consists of a thin resistive sheet and a ground separated by a quarter wavelength dielectric filler 33 34 .…”

mentioning

confidence: 99%

“…It operates by matching the absorber characteristic impedance to free space and the effective open circuit created leads to reduced reflections at the surface. However, the operation is narrowband and suffers from reduced absorption capability if the angle of incidence is not perpendicular to the absorber 32 . Nevertheless, if the number of screens can be increased, using multiple layers of thin resistive sheets with the filling dielectric, one can form a Jaumann absorber, which offers an extended bandwidth and reduced angular sensitivity 32 35 .…”

mentioning

confidence: 99%

“…However, the operation is narrowband and suffers from reduced absorption capability if the angle of incidence is not perpendicular to the absorber 32 . Nevertheless, if the number of screens can be increased, using multiple layers of thin resistive sheets with the filling dielectric, one can form a Jaumann absorber, which offers an extended bandwidth and reduced angular sensitivity 32 35 . Though very functional, the added layers and consequent increased thickness, make Jaumann screens a bulky alternative.…”

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confidence: 99%

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Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz

Tuncer

Naeem

et al. 2014

Sci Rep

218

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The development of transparent radio-frequency electronics has been limited, until recently, by the lack of suitable materials. Naturally thin and transparent graphene may lead to disruptive innovations in such applications. Here, we realize optically transparent broadband absorbers operating in the millimetre wave regime achieved by stacking graphene bearing quartz substrates on a ground plate. Broadband absorption is a result of mutually coupled Fabry-Perot resonators represented by each graphene-quartz substrate. An analytical model has been developed to predict the absorption performance and the angular dependence of the absorber. Using a repeated transfer-and-etch process, multilayer graphene was processed to control its surface resistivity. Millimetre wave reflectometer measurements of the stacked graphene-quartz absorbers demonstrated excellent broadband absorption of 90% with a 28% fractional bandwidth from 125–165 GHz. Our data suggests that the absorbers' operation can also be extended to microwave and low-terahertz bands with negligible loss in performance.

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confidence: 99%

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Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz

Tuncer

Naeem

et al. 2014

Sci Rep

218

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“…FSS have found wide use in various applications, not only radar antennas; but also to absorb an incident radiation and hence reduce the radar cross section of a target [18,19]; to provide a reflective surface for beam focusing in reflector antenna system [20][21][22] or to enhance array antenna performances [23].…”

Section: Introductionmentioning

confidence: 99%

A Physical Optics Approach to the Analysis of Large Frequency Selective Radomes

D'Elia¹,

Pelosi²,

Pichot³

et al. 2013

PIER

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Abstract-State-of-the-art radomes exploit frequency selective media so as to be transparent for the frequencies of the antenna protected by them and opaque to other frequencies. This feature helps in reducing the radar cross section of the antenna and in protecting it from interference. The study of a frequency selective radome is a daunting task, since the radome is usually large in terms of wavelengths, hence full wave analyses are prohibitive. In this paper an approximate technique, based on the physical optics concept, is proposed to attain an estimation of the behavior of a radome shielded antenna in a short time with a commonly available computer. Results are validated against a full wave technique over a relatively small radome.

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“…The material chosen here to realize the FSS rings is an isotropic sheet of multi-walled carbon nanotubes (CN) whose electrical properties have been recently assessed (Wang et al, 2008). This material not only presents high losses but also a very high permittivity; it has proven capable of achieving good absorption and very limited angular sensitivity in our previous work (D'Elia et al, 2010). The proposed surface is aimed at absorbing incident waves in the 6-16 GHz band, for the widest possible angular range.…”

Section: Introductionmentioning

confidence: 99%

Finite element design of CNT-based multilayer absorbers

D'Elia¹,

Pelosi

Selleri

et al. 2013

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – A design procedure for multi-layer absorbers based on carbon nanotubes (CNT) frequency selective surfaces (FSS) sheets is here developed. The paper aims to discuss there issues. Design/methodology/approach – Single layer FSS are first analyzed via finite element (FE). Then equivalent sheets admittances are extracted in a transmission line model. Neural networks (NNs) interpolation over this data and subsequent multi-objective genetic algorithm (GA) based optimizations are then performed to design multiple layers absorbing structures. Designs are finally validated via full wave FEM simulations. Findings – In this paper, some absorbing structures made of three or four FSS sheets with total thicknesses around 6 mm are synthesized. Research limitations/implications – NNs' accuracy used in the equivalent model can be refined with further training. Practical implications – Low profile absorbing materials are of relevant industrial interest both for radar cloaking and anechoic chambers. Originality/value – The transmission line model combined with NNs and GA optimization is capable of speeding up the design procedure with respect to a conventional full-wave FEM approach.

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A carbon-nanotube-based frequency-selective absorber

Cited by 7 publications

References 21 publications

Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz

Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz

A Physical Optics Approach to the Analysis of Large Frequency Selective Radomes

Finite element design of CNT-based multilayer absorbers

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