Microwave absorption study of dried banana leaves-based single-layer microwave absorber

2020 ◽  
pp. 1-10 ◽  
Author(s):  
Soumya Sundar Pattanayak ◽  
S. H. Laskar ◽  
Swagatadeb Sahoo
Keyword(s):  
Microwave Absorption ◽  
Single Layer ◽  
Absorption Efficiency ◽  
Extensive Study ◽  
Microwave Absorber ◽  
Thickness Variation ◽  
Absorbing Material ◽  
Absorption Performance ◽  
Banana Leaves ◽  
Microwave Absorption Performance

Abstract The ever-increasing use of electronic devices leads to a dangerous upsurge in the emission of microwave radiation; this has drawn appreciable concern in the fabrication of eco-friendly microwave absorber (MA) and it can be a prospective alternative. Present work, in the quest for possible alternatives, explores carbon-rich agricultural residues such as dry banana leaves as a microwave-absorbing material. The variation of microwave absorption efficiency with an increase in the percentage of resin has been already reported. An extensive study on the microwave absorption efficiency of dried banana leaves with sample preparation and reflectivity analysis by hardware measurement, and simulative analysis using CST microwave studio suite for different thicknesses in the frequency range of 1–20 GHz has been also explored in the present work. Single-layer MA thickness variation establishes different microwave absorption performance.

Investigation of organic corn husk-based flat microwave absorber

2020 ◽  
pp. 1-10
Author(s):  
Soumya Sundar Pattanayak ◽  
Shahedul Haque Laskar ◽  
Swagatadeb Sahoo
Keyword(s):  
Microwave Absorption ◽  
Scientific Community ◽  
Return Loss ◽  
Low Cost ◽  
Absorption Efficiency ◽  
Extensive Study ◽  
Microwave Absorber ◽  
Light Weight ◽  
Frequency Range ◽  
Corn Husk

Abstract Design and development of cheap and eco-friendly microwave absorber are one of the challenging and interesting topics for the scientific community nowadays. This paper proposes the design and fabrication of corn husk-based low cost, light-weight, and flexible microwave absorber treated as a promising eco-friendly microwave absorber. In this work, an extensive study on microwave absorption efficiency of corn husk at different thicknesses is performed in the frequency range of 1–20 GHz. The absorber at 5.21 mm thickness possesses a return loss (RL) of −32.72247 dB at 2.255 GHz. The measured RL values agree well with simulated ones, indicating the utility of proposed absorber for various practical microwave absorption applications.

scholarly journals Study on electrical conductivity and microwave absorption properties of CNTs/CB/PMMA nanocomposites foam

2021 ◽  
Author(s):  
Huajie Mao ◽  
Xuliang Zhong ◽  
Xiaorui Liu ◽  
Wei Guo ◽  
Danfeng Zhou ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Low Frequency ◽  
Absorption Efficiency ◽  
Conductive Network ◽  
Microwave Absorption Properties ◽  
Composite Foam ◽  
The Monte Carlo Method ◽  
One Step ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Abstract In order to study the conductive and microwave absorption performance of multi-dimensional multiphase filler conductive foam composites, carbon nanotubes (CNTs)/carbon black (CB)/polymethyl methacrylate (PMMA) nanocomposites with different porosity were fabricated via supercritical carbon dioxide (ScCO2) one-step physical constraint foaming technology.The effects of filler component and porosity on the conductivity and absorbing properties of CNTs/PMMA/CB composite foam were studied. The Monte-Carlo method was used to study the percolation of composites and the effect of introduced microcells on the conductive network of multi-dimensional fillers.The results revealed that the volume conductivity of CNTs(3 vol%)/PMMA composites increased from 0.88 S/m to 3.31 S/m after the addition of 1 vol% CB. CNTs and CB had obvious synergistic effect on improving the conductivity of the composites, and the microwave absorption efficiency rose from 12.6 dB to 17.2 dB. With the increase of porosity, the electromagnetic wave absorption peak of CNTs/CB/PMMA composite foam moved to low frequency, while the conductivity showed a first rise and then a decline. The simulated percolation probability obtained by representative volume element (RVE) with different porosity also showed a similar trend, which turned out that with the increase of porosity, the effect of microcells on the convertion of conductive network construction from promoting to inhibiting.

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

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