Experimental demonstration of transparent microwave absorber based on graphene

Yi, Da; Wei, Xing‐Chang; Xu, Yi-Li

doi:10.1109/ieee-iws.2016.7585411

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…Once the scattering parameters are obtained, absorption coefficients can be calculated as [24]: Application of microwave absorber on antenna array suppresses the inter-element waves which ultimately reduces the mutual coupling effect thus improving the performance of antenna array. The enhanced major lobe gain, narrow beamwidth and reduction in side lobe levels can be observed from the radiation pattern comparison shown in Fig.…”

Section: Rectangular Patch Array With Graphene Oxide-based Absorbermentioning

confidence: 99%

Investigation of substrate materials for graphene oxide absorber loaded antenna array increased ambient temperature

Rani

Marwaha

2020

Photon Netw Commun

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Integration of electromagnetic (EM) wave absorber with patch antenna array on single substrate provides a very efficient way to improve the radiation pattern of array by reducing mutual coupling effect. The placing of absorber on array assembly may however affect the radiation characteristics due to the heat generated from absorbed power. As the microwave absorber dissipates the inter-element waves in terms of heat via absorption, the ambient temperature of array increases which consequently varies the patch dimensions and dielectric properties of the substrate thus shifting the resonant frequency of array. These effects have been investigated for graphene oxide-based absorber loaded rectangular patch array designed on different substrates such as silicon, gallium arsenide, aluminium oxide and Roger RO3210. On the basis of percentage variation in return loss and effective bandwidth an optimum substrate is proposed which undergoes minimize temperature effect without deteriorating the gain and directivity of the antenna array. The results show that for Graphene oxide-based absorber with Roger RO3210 substrate having high melting temperature of 4236.85 °C, side lobe level of array is reduced from 3.737 dB to 2.551 dB with increased major lobe gain. Due to absorbed power, ambient temperature of array increased from room temperature (27 °C) to 187 °C significantly shifting the resonant frequency from 10.4 GHz to 8.9 GHz. Further the comparison results show that with aluminium oxide substrate the array exhibits minimum temperature sensitivity hence proving to be a better choice for design of microwave absorber loaded antenna array.

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Section: Rectangular Patch Array With Graphene Oxide-based Absorbermentioning

confidence: 99%

Investigation of substrate materials for graphene oxide absorber loaded antenna array increased ambient temperature

Rani

Marwaha

2020

Photon Netw Commun

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“…As shown in Figure 3b, for the 5-unit stacked absorber, approximately 90% absorption can be achieved for 125-165 GHz, which indicates the practical millimeter wave absorber has a 28% fractional absorption bandwidth with the added benefit of optical transparency. Two years later, four kinds of transparent absorbers with above 80% optical transmittivity were proposed in [24,25] by Wei et al The earliest proposed absorber by this group, exhibited in Figure 4a, is composed of monolayer graphene, glass and fluorine-doped tin oxide (FTO) glass as absorbing layer, substrate and reflector layer respectively to form a Salisbury absorber [24]. The measurement results indicate that the absorber can absorb 95% incident power at 14.5 GHz.…”

Section: Absorbers Based On Cvd-grown Graphenementioning

confidence: 99%

A review of microwave devices based on CVD-grown graphene with experimental demonstration

Chen

Liu

2019

EPJ Appl. Metamat.

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As a two-dimension planar material with zero-gap structure, graphene has a lot of outstanding properties in microwave frequency band, and the chemical vapor deposition (CVD) method can produce the large-scale graphene sheets with high quality for applications. Thus, the study about the microwave devices based on CVD-grown graphene has been aroused wide interests in the past few years. In this paper, mainly concentrating on the research by Chinese scientific groups, we review the development of microwave devices based on the CVD-grown graphene which are all validated by experiments, including attenuators, absorbers, antennas, electromagnetic interference (EMI) shielding and beam reconfiguration.

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“…The Salisbury screen is tested with the help of rectangular waveguide, and the same is simulated using three-dimensional simulation software and it is concluded that absorption coefficient exceeds above 95% around 15.1 GHz. In this paper, tenability property of graphene is not used which can make absorber even more efficient [59].…”

Section: Dielectric Nanocompositesmentioning

confidence: 99%

Exploring the feasibility of development of nanomaterial-based microwave absorbers

Rani

Marwaha

2018

Int Nano Lett

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Advancement in the use of microwave electronics by the wireless devices, networks' server and switches, wireless antenna systems, and mobile phone base station potentially increased the radio-frequency interference. Effective elimination of this electromagnetic pollution is very necessary for proper working of electronic equipments. Microwave absorbers serve the above purpose leading to have enormous commercial and defence applications, for antenna shielding and laboratory testing of antenna. Researchers are, therefore, paying much attention on the study and fabrication of different materials and their shapes so as to use them as an absorber which ideally exhibits properties such as (1) strong absorption; (2) minimize the reflection of microwaves at air to absorber interface; (3) broader bandwidth; (4) low weight and thickness; (5) ignition at very high temperature; (6) frequency tunability; and (7) transparent and cost effective. In this paper, absorber designs based on materials and geometries proposed by number of researchers have been extensively reviewed. The preamble presented here can be explored to design novel absorbers combining material and geometry-based designs for enhanced performance to meet the future challenges.

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Experimental demonstration of transparent microwave absorber based on graphene

Cited by 10 publications

References 7 publications

Investigation of substrate materials for graphene oxide absorber loaded antenna array increased ambient temperature

Investigation of substrate materials for graphene oxide absorber loaded antenna array increased ambient temperature

A review of microwave devices based on CVD-grown graphene with experimental demonstration

Exploring the feasibility of development of nanomaterial-based microwave absorbers

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