Properties of Electric Conducting Magnetic Composites in the Ultrashort Range of Radio Waves
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erties of Electric Conducting Magnetic Composites in the Ultrashort Range of Radio Waves D. A. Kalikintsevaa, *, V. Y. Buz’kob, S. A. Vyzulina, A. I. Goryachkob, L. I. Sarinc, O. A. Kolantsovc, and E. L. Miroshnichenkoa aKrasnodar
Higher Military School, RF Ministry of Defense, Krasnodar, 353035 Russia b Kuban State University, Krasnodar, 350040 Russia c OOO Bolid, Novosibirsk, 630015 Russia *e-mail: [email protected]
Received March 19, 2020; revised April 10, 2020; accepted May 27, 2020
Abstract—A study is made of the radio-shielding and radio-absorbing properties of three-phase ECOMP/graphite/paraffin composites in the ultrashort range of wavelengths. The effect the concentration of components of the radioabsorbing filler of a composite has on its dielectric permittivity, losses, and electrical conductivity is determined. DOI: 10.3103/S1062873820090166
INTRODUCTION The development of electronic technology requires that we improve ways of shielding technical devices from high-frequency and ultra-high-frequency electromagnetic radiation (EMR). Different types of radio-shielding and radio-absorbing materials (RSMs and RАMs) are now in wide use. The high electrical conductivity of RSMs results in high coefficients of EMR reflection from the surfaces of screens based on them, and thus in high coefficients of electromagnetic shielding [1]. Most radio equipment has holes for commutation or ventilation. The use of electrically conductive materials in the manufacture of radioshielding housings results in the resonance of standing electromagnetic waves inside them and the leaking of electromagnetic radiation through such holes [2–7]. These processes can substantially reduce the effectiveness of radioshielding. The use of radioabsorbing materials based on magnetodielectric composites not combined with electrically conductive radioreflective screens may not be sufficiently effective for practical purposes of radioscreening [7]. Most samples of RAMs are generally highly effective in reducing the reflection of electromagnetic radiation from metal surfaces. The coefficient of EMR shielding in the UHF and near microwave ranges for radioabsorbing coatings (RACs) usually does not reach high values (it is
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