High-Performance and Ultra-Broadband Metamaterial Absorber Based on Mixed Absorption Mechanisms

Wang, Can-Yu; Liang, Jian‐Gang; Cai, Tong; Li, Haipeng; Ji, Wenye; Zhang, Qing; Zhang, Chengwu

doi:10.1109/access.2019.2913278

Cited by 45 publications

(20 citation statements)

References 39 publications

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“…However, the transmissivity T should be zero with effect of the CFs back panel, so the absorptivity A can be given by A(ω)=1-R(ω). The longitudinal and transverse conductivities of the CFs composite were set as 2.510 4 and 89 S/m [23], respectively and the permittivity and loss tangent of the GFs composite were set as 4.3 and 0.025, as shown in Table 1. Meanwhile, the EM parameters of copper were obtained from that of the copper (annealed) in material library of CST Microwave Studio 2015.…”

Section: B Simulationsmentioning

confidence: 99%

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Design of the Broadband Metamaterial Absorber Based on Dispersed Carbon Fibers in Oblique Incidence

Yan

Jiang

et al. 2020

IEEE Access

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In this paper, a broadband double-layer metamaterial absorber (MMA) based on carbon fibers (CFs) is proposed, which consists of three basic elements. Firstly, the reflectivity of CFs double-layer MMA in normal incidence is analyzed, and compared to the copper double-layer MMA with same size, the simulated results show that it obtains better absorbing effect. With the increase of incident angle, the multifrequency resonance is activated, leading to larger effective bandwidth. Moreover, when incident angle is between 55 and 70 degrees, the continuous absorption band above 85% can totally cover X and Ku microwave band. Meanwhile, when the EM frequency is at 6-7.5GHz, the change of incident angle hardly affects the absorbing performances of CFs double-layer MMA. A specimen of the CFs double-layer MMA was fabricated by the vacuum bag molding process to verify its effectiveness and the measured results fitted well with the simulated results. In order to discuss the mechanism of EM absorption, the distribution of E-fields and power loss density were monitored. The results indicate that incident angle effects the distribution of Efields and the way of absorption to change the absorbing performances. The proposed MMA has potential application prospects in the structural and functional integration design of CFs.

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Section: B Simulationsmentioning

confidence: 99%

“…The metamaterial absorber (MMA) is an effective structure to achieve stealth performances [1][2][3][4]. The absorbing performances are determined by the periodic unit of the structure and have almost nothing to do with the material itself.…”

Section: Introductionmentioning

confidence: 99%

Design of the Broadband Metamaterial Absorber Based on Dispersed Carbon Fibers in Oblique Incidence

Yan

Jiang

et al. 2020

IEEE Access

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“…η eff‐TM decreases as the incident angle increases, whereas η eff‐TE varies oppositely. These wave impedances can be calculated using the following relations [35]:

\begin{matrix} right leftthickmathspace.5em \\ η_{normaleff - normalTM} & = η \cos θ \\ η_{normaleff - normalTE} & = \frac{η}{\cos θ} . \end{matrix}

Fig. 9 shows the effect of various oblique incidence angles ( θ ) on the absorption coefficient for a fixed polarisation angle ( φ ) under both TE and TM polarisation.…”

Section: Design and Simulationsmentioning

confidence: 99%

Hybrid absorber with carbon black composite and metamaterial structure

Dehghan-Banadaki¹,

Heidari²,

Nakhkash³

2020

IET Microwaves, Antennas & Propagation

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“…The performance of MBB networks has been extensively studied from various aspects and contexts throughout the literature [26][27][28][29][30][31]. Several measurements and data processing applications, software packages and platforms with various measurement data types have been used for distinct MBB performance metrics.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Mobile Broadband Networks With 5G Trends and Beyond: Urban Areas Scope in Malaysia

et al. 2021

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The performance of Mobile Broadband (MBB) services of Fourth Generation (4G) and Third Generation (3G) mobile networks over urban morphology is studied in Malaysia based on experimental measurements of drive test data. The aim of this study is to provide a roadmap for service providers to establish a realistic plan for future Fifth Generation (5G) networks. This work is a continuation of our previous work for the scope of rural areas in Malaysia. The MBB measurement data have been gathered through drive tests conducted in the urban areas of four states throughout Malaysia (namely, Klang Valley/Selangor, Johor, Sarawak and Sabah) to characterise and analyse MBB performances. The gathered data are from the cities, highways and federal roads of the chosen states, and encompasses three main Mobile Network Operators (MNOs). Data has been collected in a time span of 2 months, from January to February, using the Samsung Galaxy S6 smartphone handsets. Four MBB Key Performance Indicators (KPIs) are considered in this study (coverage, latency, satisfaction and speed) for two MBB services (web browsing and video streaming). The measurement data for characterising the performance of each MBB service has been collected using a dedicated smartphone handset. YouTube videos with 720p and 1080p resolutions have been sequentially streamed to assess the performance of MBB video-streaming services. Three distinct websites (Google, Instagram and mStar) have been accessed to evaluate the performance of MBB web-browsing services. The experimental methodology of this study integrates several diversified elements including four different urban states, four distinct KPIs, three main MNOs, two MBB services and two radio networks (4G and 3G), which are both accessible by the smartphones when available to mimic real-world scenarios. The results of this study reveal that the performance of 4G radio networks is generally superior to that of 3G . For instance, 4G networks achieved a vMOS score of more than 3 for both MBB video-streaming and web-browsing services, while 3G networks scored less than 3 across all four study areas. The analysed experimental results confirmed that compared to 3G networks, 4G technology presents an enhancement factor of up to 1.6 and 4.2 in download speed when streaming a video and browsing a web page, respectively. The study outcomes can contribute to the efficient planning of nonstandalone (NSA) 5G networks in Malaysia where 5G networks will be aided by existing 4G infrastructures. Analysing the 4G coverage performance is the first step towards deciding the deployment rate of NSA 5G in Malaysia.INDEX TERMS Mobile Broadband, urban areas, Malaysia, 3G and 4G networks, plans for 5G technology in Malaysia

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High-Performance and Ultra-Broadband Metamaterial Absorber Based on Mixed Absorption Mechanisms

Cited by 45 publications

References 39 publications

Design of the Broadband Metamaterial Absorber Based on Dispersed Carbon Fibers in Oblique Incidence

Design of the Broadband Metamaterial Absorber Based on Dispersed Carbon Fibers in Oblique Incidence

Hybrid absorber with carbon black composite and metamaterial structure

Performance Analysis of Mobile Broadband Networks With 5G Trends and Beyond: Urban Areas Scope in Malaysia

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