Morphology, size, and defect engineering in CeOHCO3 hierarchical structures for ultra-wide band microwave absorption

2021 ◽  
Author(s):  
Haiyan Wei ◽  
Xinxin Wang ◽  
Guoxiu Tong ◽  
Baoxin Fan ◽  
Xiaojuan Wang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Electromagnetic Interference ◽  
Hierarchical Structures ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Defect Engineering ◽  
Microwave Assisted

The growing electromagnetic interference problem triggers higher requirements for the exploration into new electromagnetic wave (EMW) absorbers and new absorption mechanisms. Herein, we developed a simple and rapid microwave-assisted hydrothermal...

Bimetallic MOF-derived porous CoNi/C nanocomposites with ultra-wide band microwave absorption properties

2019 ◽  
Vol 43 (42) ◽  
pp. 16546-16554 ◽  
Author(s):  
Chang Liu ◽  
Jing Qiao ◽  
Xue Zhang ◽  
Dongmei Xu ◽  
Nannan Wu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Fine Particles ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Target Product ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing ◽  
Distributed Elements

The CoNi bimetallic MOF-derived composites were synthesized in this work. The target product is composed of fine particles with uniformly distributed elements of Ni, Co, C. The CoNi/C-650 sample displays good microwave absorbing properties.

scholarly journals Numerical Assessment of Electromagnetic Radiated Emissions from an UWB Radiators Located Inside Metallic Enclosures with Small Air-Flow Openings

2018 ◽  
Vol 15 (2) ◽  
pp. 155
Author(s):  
Mohammed M Bait-Suwailm ◽  
Boudelliou A Boudelliou ◽  
Naser Al-Tarhuni
Keyword(s):  
Electromagnetic Interference ◽  
Heat Dissipation ◽  
Air Flow ◽  
Electronic Devices ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Shielding Effectiveness ◽  
Numerical Assessment ◽  
Radiated Emissions ◽  
Circular Holes

Shielding effectiveness of electronic devices and computing devices is  essential at design stages. Devices should pass electromagnetic interference/compatibility tests for certification purposes. In this paper, we investigate the electromagnetic radiation leakage from modern personal computers and mobile electronic devices due to an ultra-wide band source of noise. Openings and slots are always unavoidable in electronic devices, for instance openings in computers for air-flow and heat dissipation. Three different designs of enclosure’s covers with apertures are modeled for this purpose. The three covers cases comprise the use of rectangular arranged circular holes, hexagonal arranged circular holes, and square openings. For comparison purposes, a shielded enclosure with no openings is considered. The shielding effectiveness is numerically assessed here by capturing electric field strength that is modeled using probes located at two different distances, near- and far-away from the metallic enclosure.

Preparation and electromagnetic wave absorption properties of novel dendrite-like NiCu alloy composite

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42587-42590 ◽  
Author(s):  
Biao Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Wanyu Zhao ◽  
Rui Zhang
Keyword(s):  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Wide Band ◽  
Strong Absorption ◽  
Alloy Composite ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Nicu Alloys

The dendrite-like NiCu alloys show outstanding microwave absorption properties with the features of thin-thickness, strong absorption and wide-band.

scholarly journals ULTRA WIDE BAND RESPONSE OF AN ELECTROMAGNETIC WAVE SHIELD BASED ON A DIODE GRID

2013 ◽  
Vol 141 ◽  
pp. 591-605 ◽  
Author(s):  
Yangjun Zhang ◽  
Mengqing Yuan ◽  
Qing Huo Liu
Keyword(s):  
Electromagnetic Wave ◽  
Wide Band ◽  
Ultra Wide Band

scholarly journals Numerical Assessment of Electromagnetic Radiated Emissions from an UWB Radiators Located Inside Metallic Enclosures with Small Air-Flow Openings

2018 ◽  
Vol 15 (2) ◽  
pp. 55
Author(s):  
Mohammed M Bait-Suwailm ◽  
Boudelliou A Boudelliou ◽  
Naser Al-Tarhuni
Keyword(s):  
Electromagnetic Interference ◽  
Heat Dissipation ◽  
Air Flow ◽  
Electronic Devices ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Shielding Effectiveness ◽  
Numerical Assessment ◽  
Radiated Emissions ◽  
Circular Holes

Shielding effectiveness of electronic devices and computing devices is  essential at design stages. Devices should pass electromagnetic interference/compatibility tests for certification purposes. In this paper, we investigate the electromagnetic radiation leakage from modern personal computers and mobile electronic devices due to an ultra-wide band source of noise. Openings and slots are always unavoidable in electronic devices, for instance openings in computers for air-flow and heat dissipation. Three different designs of enclosure’s covers with apertures are modeled for this purpose. The three covers cases comprise the use of rectangular arranged circular holes, hexagonal arranged circular holes, and square openings. For comparison purposes, a shielded enclosure with no openings is considered. The shielding effectiveness is numerically assessed here by capturing electric field strength that is modeled using probes located at two different distances, near- and far-away from the metallic enclosure.

Activity Recognition using Ultra Wide Band Range-Time Scan

2021 ◽  
Author(s):  
Arijit Chowdhury ◽  
Taniya Das ◽  
Smriti Rani ◽  
Anwesha Khasnobish ◽  
Tapas Chakravarty
Keyword(s):  
Activity Recognition ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Time Scan

Microwave wide band absorption by carbon from Corn cob-1

2016 ◽  
Vol 12 (2) ◽  
pp. 4204-4212 ◽  
Author(s):  
Maheshwar Sharon ◽  
Ritesh Vishwakarma ◽  
Abhijeet Rajendra Phatak ◽  
Golap Kalita ◽  
Nallin Sharma ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Agricultural Waste ◽  
Wide Band ◽  
Nickel Nitrate ◽  
Equivalent Amount ◽  
Frequency Range ◽  
Corn Cob ◽  
Different Temperatures ◽  
Band Absorption ◽  
5 Ghz

Corn cob, an agricultural waste, is paralyzed at different temperatures (700oC, 800oC and 900oC). Microwave absorption of carbon in the frequency range of 2 GHz to 8 GHz is reported. Carbon activated  with 5%  nickel nitrate showed more than 90% absorption of microwave in the frequency range from 6 GHz to 8 GHz, while carbon activated  with 10% Nickel nitrate treated corn cob showed 90% absorption  in the frequency range of 2.5 GHz to 5 GHz. Carbon showing the best absorption are characterized by XRD, Raman spectra and SEM . It is suggested that corn cob treatment   alone with KOH did not improve the microwave absorption, whereas treatment along with nickel nitrate improved the absorption property much better. It is proposed that treatment with nickel nitrate helps in creating suitable pores in carbon   which improved the absorption behavior because while treating carbon with 1N HCl helps to leach out nickel creating equivalent amount of pores in the carbon.

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