DOI: https://doi.org/10.15407/techned2018.04.014

A THIN ELECTROMAGNETIC SHIELD OF A COMPOSITE STRUCTURE MADE ON THE BASIS OF A MAGNETIC FLUID

Authors
V.A.Glyva¹, A.D.Podoltsev²*, B.V.Bolibrukh³, A.V.Radionov^4
1 – National Aviation University,
Kosmonavta Komarova ave., 1, Kyiv-58, 03058, Ukraine
² – Institute of Electrodynamics National Academy of Sciences of Ukraine,
pr. Peremohy, 56, Kyiv, 03057, Ukraine,
e-mail: Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript
³ – Lviv Polytechnic National University,
Stepana Bandery, 12, Lviv, 79013, Ukraine
⁴ – SIIE "Ferrohydrodynamica",
B. Morskaya str., 45/5, Mykolayiv, 54030, Ukraine
* ORCID ID : http://orcid.org/0000-0002-9029-9397

Abstract

A thin electromagnetic shield (0.25 – 0.50 mm thick) were developed, which has a composite structure and was made on a magnetic fluid deposited on a dielectric substrate. Experimental researches of its shielding and electromagnetic properties were carried out. It is shown that the screening coefficient of a low-frequency magnetic field for such a screen is 2.4 – 7.8. The screening coefficient for an ultrahigh-frequency magnetic field is 3.0 – 9.3. The values of these coefficients depend on the thickness of the screen. The calculation-experimental method is proposed for the determine of the effective magnetic permeability of the composite screen material. This method is using the well-known analytical solution of the magnetostatic problem for a thin spherical shell and the results of measuring screening coefficients for a screen of spherical (or nearly spherical) shape. The obtained relative values of the magnetic permeability of the material for the case of a low-frequency magnetic field are 420 – 1050. These values depend little on the thickness of the screen. References 10, figures 2, tables 2.

Key words: electromagnetic screen, composite material, magnetic fluid, screening coefficient, effective magnetic permeability.

Received:    06.03.2018
Accepted:   03.04.2018
Published:

References

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