scholarly journals A review on the pursuit of an optimal microwave absorber

2021 ◽  
Vol 34 (4) ◽  
pp. 631-645
Author(s):  
Soma Chakraborty ◽  
Soumik Chakraborty
Keyword(s):  
Electromagnetic Interference ◽  
Review Paper ◽  
Absorption Efficiency ◽  
Microwave Absorber ◽  
Handheld Devices ◽  
Light Weight ◽  
Radar Signature ◽  
Absorption Performance ◽  
Materials Used ◽  
Electromagnetic Radiations

Mitigation of the electromagnetic radiations is essential for reliable communication of information. The challenges lie in achieving sufficiently good absorption over a broad range of frequencies. Considering the applications in airborne and handheld devices where light weight, thin, conformable and broadband absorbers are desired, numerous techniques and methods are applied to design broadband absorbers. In this review paper, a detailed analysis on electromagnetic absorbers including evolution, the materials used, and characteristics such as absorption efficiency over the years is presented. Progress on recent research on various polymer- based and metamaterial- based microwave shields are included along with their findings. Several prospects such as broadbanding, flexibility, multibanding are described here. Various material and structural composition offering good absorption performance in different frequency bands are also summarized whose the techniques can be used for suppressing electromagnetic interference and radar signature. The paper specifies the aspects one encounters while designing and realizing a perfect microwave absorber. Explored here are several works of distinguished authors which are based on various techniques used to achieve good absorption performance with ease of mounting.

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 A Study of Carbon Coated Flat Stick Bamboo Microwave Absorber Performance

2020 ◽  
pp. 331-336
Author(s):  
Azizah Ahmad ◽  
◽  
Hasnain Bin Abdullah ◽  
Linda Mohd Kasim ◽  
Noor Azila Ismail ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Microwave Frequency ◽  
Microwave Absorber ◽  
Industry Standard ◽  
Flat Shape ◽  
Carbon Coated ◽  
Absorption Performance ◽  
Agricultural Material ◽  
Main Material

Electromagnetic radiation can be prevented by using microwave absorber. Microwave absorbers are applied in an anechoic chamber for the electromagnetic compatibility (EMC) and electromagnetic interference (EMI) evaluation on its wall, ceiling, and floor. The purpose of this research is to develop a carbon-coated flat shape of biomass absorbers using an agricultural material. The main material used in constructing the flat absorber is natural bamboo. The flat shaped absorber is selected as it able to meet the specified industry standard and can be used appropriately in the microwave frequency range. Carbon coated cylindrical bamboos with different radiuses have been used for this study. Studies were conducted on two different sizes of the radius that is 0.2 cm for Design 1 and 1 cm for Design 2. The ranges of frequencies are set in the range from 1 GHz to 12 GHz. The result of the microwave absorber is analyzed for its absorption performance. The generated result from the performance shows that the carbon-coated flat stick bamboo microwave absorber operates the best in Design 2 with 45.7% of absorption performance compared with Design 1. The overall results in different angles for both designs are analyzed and compared.

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.

scholarly journals Metamaterial Microwave Absorber (MMA)) for Electromagnetic Interference (EMI)) Shielding in X-band

2021 ◽  
Author(s):  
Rakesh Mishra ◽  
Ravi Gupta ◽  
Suwarna Datar
Keyword(s):  
Electromagnetic Interference ◽  
Rotational Symmetry ◽  
Unit Cell ◽  
Microwave Absorber ◽  
Light Weight ◽  
Emi Shielding ◽  
S Parameter ◽  
X Band ◽  
Planar Array ◽  
High Absorption

Abstract The present paper is aimed at investigating application of planar Metamaterial (MM) structures for effective EMI Shielding and Stealth applications in X-Band. Various MM structures using FR4 substrate and Copper conductors were conceived and designed followed by simulations carried out using CST MWS Suite software. As a first step, the de- signs were aimed at achieving extremely high absorption for normal incidence, polarisation independence and maintaining high absorption in wide angle performance while keeping the requirement of light weight, flexibility and environmental ruggedness in mind for deployability on platforms to achieve effective stealth against Radars and for other EMI shielding applications. Circularly symmetric, single layer Metamaterial Microwave Absorber (MMA) design over thin FR4 substrate in spokes and wheel structural arrangement provided these desired features. The thin FR4 substrate of 0.6 mm provides the light weight and flexibility while absorbing the EM waves. Rotational symmetry of the spoke and cut-wheel design gives it polarisation independence and 4 ring planar array concept with rings scaled to different sizes in the same plane in the unit cell provided the increase in bandwidth. Reduction in received signal level of the echo is depicted by the S-Parameter at the input port. Getting values of this S-Parameter less than -60dB at resonant frequency for MMAs is highly encouraging and is not reported much in literature. Enhancement of nearly 3-8 times in operating bandwidth was achieved by changing size of rings in each quadrant in the co-planar array having four resonant rings in each unit cell.

Enhanced shielding of electromagnetic radiations with flexible, light‐weight, and conductive Ag‐Cu / MWCNT / rGO architected PVDF nanocomposite films

2021 ◽  
Author(s):  
Kumaran Rengaswamy ◽  
Vinaya Kumar Asapu ◽  
Alagar Muthukaruppan ◽  
Dinesh Kumar Sakthivel ◽  
Subramanian Venkatachalam ◽  
...  
Keyword(s):  
Nanocomposite Films ◽  
Light Weight ◽  
Electromagnetic Radiations

Bending Behavior of Simply-Supported Sandwich Beams Subjected to Large Deflection

2018 ◽  
Vol 777 ◽  
pp. 569-574
Author(s):  
Zhong You Xie
Keyword(s):  
Energy Absorption ◽  
Large Deflection ◽  
Absorption Efficiency ◽  
Sandwich Beams ◽  
Element Simulation ◽  
Energy Absorption Efficiency ◽  
Load Carrying ◽  
Absorption Performance ◽  
Bending Behavior ◽  
The Moment

Due to thin skins and soft core, it is apt to local indentation inducing the concurrence of geometrical and material nonlinearity in sandwich structures. In the paper, finite element simulation is used to investigate the bending behavior of lightweight sandwich beams under large deflection. A modified formulation for the moment at mid-span section of sandwich beams under large deflection is presented, and energy absorption performance is assessed based on energy absorption efficiency. In addition, it is found that no local indentation arises initially, while later that increases gradually with loading displacement increasing. The height of the mid-span section as well as load-carrying capacity decreases significantly with local indentation depth increasing.

scholarly journals ТЕКСТИЛЬ ДЛЯ ЗАХИСТУ ВІД ЕЛЕКТРОМАГНІТНОГО ВИПРОМІНЮВАННЯ

2019 ◽  
Vol 134 (3) ◽  
pp. 48-61
Author(s):  
О. П. Кизимчук ◽  
С. І. Арабулі ◽  
В. І. Власенко
Keyword(s):  
Electromagnetic Radiation ◽  
Electromagnetic Interference ◽  
Scientific Literature ◽  
Radiation Shielding ◽  
Production Methods ◽  
Textile Materials ◽  
Basic Production ◽  
Materials Used

Analysis  of  existing  textile  materials  used  for  electromagnetic  radiation  shielding,  their systematization, and basic production methods are the main goals of this review. Methodology. The review of scientific literature and the systematization of the results in the field "textile materials for electromagnetic interference" are the main methods used for this research.

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