Theoretical Analysis and Design of Ultrathin Broadband Optically Transparent Microwave Metamaterial Absorbers

Deng, Ruixiang; Li, Meiling; Muneer, Badar; Zhu, Qi; Shi, Zaiying; Song, Lixin; Zhang, Tao

doi:10.3390/ma11010107

Cited by 57 publications

(23 citation statements)

References 28 publications

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“…The highest value of transmission coefficients is recorded for the lowest ratio of filler at 5 g wood filler with the least value recorded for the highest ratio of filler at 25 g content. This result is in agreement with impedance mismatch theory, where materials with the highest permittivity depict lower transmission coefficient values [12].…”

Section: Resultssupporting

confidence: 91%

Attenuation and Shielding Performance of Wood-Polymer Composites Synthesized via Melt-Blend Technique

Yakubu¹,

Abbas²,

Abdullahi³

2020

OALib

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In the recent, filler-polymer composites researches have been on the rise due to its implication to electromagnetic interference (EMI) applications. The composition, morphology and surface rheology of the filler-polymer composites play an immense role in determining the electrical, mechanical, and optical properties. In this paper, the preparation and characterization of micro-composites of wood (biodegradable waste material)/polycaprolactone (PCL) composites are reported. The micro-composites were prepared using melt blend technique via the solid state route. This method was selected because of its numerous advantages compared to other methods such as being easy, cheap with mass production of materials. To determine attenuation, rectangular waveguide (RWG) method was used. The magnitudes of the transmission coefficient (S 21) from the waveguide measurement were used to determine the attenuation of the wood-PCL composite substrate with respect to different percentages of wood filler. Result from the measurement showed amongst others that as the filler content increases, the attenuation increases. The highest magnitude for attenuation was calculated for the 62.5% wood-PCL composites with a value of −6.46 dB and the least attenuation was calculated for the 12.5% wood micro filler, which value gave −3.34 dB which is good for low shielding applications. Scanning electron microscope (SEM) was used to study the surface morphology of the samples.

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Section: Resultssupporting

confidence: 91%

Attenuation and Shielding Performance of Wood-Polymer Composites Synthesized via Melt-Blend Technique

Yakubu¹,

Abbas²,

Abdullahi³

2020

OALib

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“…However, the OTMAs based on both metal wire and graphene materials usually cannot achieve high optical transmittance and large bandwidth at the same time, which limits their applications in the field of transparent electronics. In the strict sense, these designed OTMAs are still far from practical application for airborne and surveillance radar signal absorption [20][21][22], which usually requires the operating band to cover X (8. 2-12.4 GHz) and Ku (12.4-18 GHz) bands or even wider.…”

Section: Introductionmentioning

confidence: 99%

Composite structure-based transparent ultra-broadband metamaterial absorber with multi-applications

Liu

Zhang

Duan

et al. 2020

Mater. Res. Express

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In this paper, an approach is proposed to realize optically transparent metamaterial absorber (OTMA) with ultra-broadband absorption properties by using composite resonant structure. The indium tin oxide (ITO) resistive film is used to construct the resonant structure to induce high ohmic loss and broaden the bandwidth of the resonances, thus achieves more than 90% absorptivity in the wide bandwidth of 8-30.3 GHz, which can cover the X and Ku bands of the airborne and surveillance radar signal frequencies. The novelty of designed structure lies in the properties of larger absorption bandwidth (covering X, Ku, K and part of Ka bands), lower thickness, and absorption capacity over a wide range of incident angles. Moreover, by replacing the intermediate air spacer with polydimethylsiloxane (PDMS) and polymethyl methacrylate (PMMA) dielectrics, the OTMAs that can be used for conformal applications and rigid window glass of stealth armament are designed. This strategy provides more flexibility for the applications of broadband OTMA in different occasions, and has potential application prospects in radar stealth system, EM shielding and transparent RF equipment fields. The average optical transmittance of the whole structure in the visible light range exceeds 78%.

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“…In this context, numerous structures and different materials have been introduced in the design of EM absorbers. The operating frequencies of absorbers have covered the microwave band [ 11 , 12 , 13 , 14 , 15 ], Terahertz band [ 16 , 17 , 18 , 19 , 20 ], and the infrared and visible light band [ 21 ]. Different features of EM absorbers, such as their low profile, easy fabrication process and light weight, have been deeply investigated to meet various requirements.…”

Section: Introductionmentioning

confidence: 99%

3D-Printed Low-Cost Dielectric-Resonator-Based Ultra-Broadband Microwave Absorber Using Carbon-Loaded Acrylonitrile Butadiene Styrene Polymer

Ren

Yin

2018

Materials

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In this study, an ultra-broadband dielectric-resonator-based absorber for microwave absorption is numerically and experimentally investigated. The designed absorber is made of the carbon-loaded Acrylonitrile Butadiene Styrene (ABS) polymer and fabricated using the 3D printing technology based on fused deposition modeling with a quite low cost. Profiting from the fundamental dielectric resonator (DR) mode, the higher order DR mode and the grating mode of the dielectric resonator, the absorber shows an absorptivity higher than 90% over the whole ultra-broad operating band from 3.9 to 12 GHz. The relative bandwidth can reach over 100% and cover the whole C-band (4–8 GHz) and X-band (8–12 GHz). Utilizing the numerical simulation, we have discussed the working principle of the absorber in detail. What is more, the absorption performance under different incident angles is also simulated, and the results indicate that the absorber exhibits a high absorptivity at a wide angle of incidence. The advantages of low cost, ultra-broad operating band and a wide-angle feature make the absorber promising in the areas of microwave measurement, stealth technology and energy harvesting.

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Theoretical Analysis and Design of Ultrathin Broadband Optically Transparent Microwave Metamaterial Absorbers

Cited by 57 publications

References 28 publications

Attenuation and Shielding Performance of Wood-Polymer Composites Synthesized via Melt-Blend Technique

Attenuation and Shielding Performance of Wood-Polymer Composites Synthesized via Melt-Blend Technique

Composite structure-based transparent ultra-broadband metamaterial absorber with multi-applications

3D-Printed Low-Cost Dielectric-Resonator-Based Ultra-Broadband Microwave Absorber Using Carbon-Loaded Acrylonitrile Butadiene Styrene Polymer

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