Design and characterisation of frequency selective conductive materials for electromagnetic fields control

Konoplev, I. V.; Boer, de; Warsop, C M; John, M.

doi:10.1038/s41598-020-76447-x

Cited by 7 publications

(3 citation statements)

References 43 publications

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“…It reveals that the Al foil–based energy harvester generates a maximum instantaneous power of 5.34 μW. Noteworthy that the Al foil exhibits low resistance due to its high conductivity; however, the induced eddy current on the Al foil surface increases the resistance of the foil surface, [ 41 ] that causes an enhancement in the internal impedance of the Al foil–based device. Therefore, the maximum power conversion occurred at high external load resistance (i.e., ≈kΩ) even though Al foil has resistance in the order of Ω.…”

Section: Resultsmentioning

confidence: 99%

Real‐Time Smartphone Charging from Recycled Aluminum Foil–Based Electromagnetic Energy Harvester

Saini¹,

Kumar²,

Mishra³

et al. 2023

Energy Tech

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Harvesting energy from waste resources shows significant potential in low‐power electronics, self‐powered devices, and waste‐energy management. Herein, a possible mechanism is demonstrated to harvest waste electromagnetic (EM) energy produced by the induction heater where recycled aluminum foil is utilized as an energy‐harvester unit. As a consequence, ≈5.34 μW of harvested power is manifested under the operating condition of the induction heater. In this connection, a demonstration of the real‐time calculator operation, 26 blue light‐emitting diode lighting, and smartphone battery charging are presented. It indicates an excellent opportunity to harvest the abundantly available waste EM energy using the recycled and widely used food‐packaging Al foil. Thus, it is expected that the waste EM energy can be utilized to power up consumer electronic appliances.

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Section: Resultsmentioning

confidence: 99%

Real‐Time Smartphone Charging from Recycled Aluminum Foil–Based Electromagnetic Energy Harvester

Saini¹,

Kumar²,

Mishra³

et al. 2023

Energy Tech

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“…защита приборов электронной техники от воздействия помех, значения частоты которых известны точно [3][4][5][6][7][8].…”

Section: Introductionunclassified

Improved technology for manufacturing frequency-selective electromagnetic shields of the microwave range containing spiral elements

Boiprav

Bogush

2023

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

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The results of substantiation of the improved technology for manufacturing of the frequency-selective electromagnetic shields are presented. The improvement of this technology was ensured by the following: 1) the inclusion of elements in the form of classical Archimedes spirals, formed from foil materials, into the volume of manufactured shields to ensure the frequency-selective properties of such shields; 2) fixing the specified elements in the volume of manufactured shields by thermal pressing. The indicated features determine the main advantage of the improved technology in comparison with its analogues — lower time costs required for its implementation. The substantiation of the improved technology was implemented in the following areas: 1) setting the parameters of Spiral elements, which correspond to the maximum values of energy losses of the electromagnetic radiation interacting with them in the microwave range; 2) determination of the order of arrangement of spiral elements in the volume of the screens, which corresponds to the lowest values of electromagnetic radiation transmission and reflection coefficients in the microwave range of these shields. The substantiation implemented in the first of the indicated directions was based on the results of the analysis of the content of scientific works devoted to mathematical modeling and the study of the electromagnetic radiation of the transmission characteristics of flat spiral antennas in the microwave range. The substantiation implemented in the second of the indicated directions was based on the manufacture of experimental samples of the shields, the volume of which includes spiral elements oriented in a certain way, and further obtaining and comparative analysis of electromagnetic radiation transmission and reflection characteristics in the microwave range of these shields. Shields manufactured in accordance with substantiated improved technology seem to be promising for use in order to protect electronic devices from the effects of electromagnetic interference.

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“…-development of radio measuring devices (reference specimens are made on the basis of frequency-selective electromagnetic shields [1,2]); -electronic device protection against noise with exactly known frequencies [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Improved technology of frequency-selective UHF electromagnetic shields containing helical elements

Boiprav

Bogush

2022

MoEM

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An improved technology of frequency-selective electromagnetic shields has been considered. The technology has been improved by embedding classic Archimedean helical elements made from foiled materials into the bulk of the shields for the improvement of the frequency-selective performance of the shields and pinning of these elements in the bulk of the shields by means of fusion bonding. These design features provide for the main advantage of the improved technology in comparison with counterparts, i.e., lower time consumption. The technology has been improved in the following two aspects: 1) identification of helical element parameters providing for the greatest energy loss of the UHF electromagnetic radiation interacting with the helical elements; 2) identification of the optimum helical element arrangement in the shield bulk providing for the smallest transmission and reflection coefficient of the UHF electromagnetic radiation by the shields. Technology improvement in accordance with the former of the above aspects has been achieved based on analysis of publications dealing with mathematical simulation and study of the parameters of UHF electromagnetic radiation transmission by planar helical antennas. Technology improvement in accordance with the latter aspect has been achieved based on experimental data. Test shields have been fabricated with specifically arranged embedded helical elements, and comparison has been made between the UHF electromagnetic radiation transmission and reflection coefficients of the shields. Shields fabricated in accordance with the improved technology suggested herein show good promise for the electromagnetic noise protection of electronic devices.

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Design and characterisation of frequency selective conductive materials for electromagnetic fields control

Cited by 7 publications

References 43 publications

Real‐Time Smartphone Charging from Recycled Aluminum Foil–Based Electromagnetic Energy Harvester

Real‐Time Smartphone Charging from Recycled Aluminum Foil–Based Electromagnetic Energy Harvester

Improved technology for manufacturing frequency-selective electromagnetic shields of the microwave range containing spiral elements

Improved technology of frequency-selective UHF electromagnetic shields containing helical elements

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