Improving the shielding efficiency and weight reducing of the radio-absorbing coating by adding a matching layer

Abstract The spectra of complex permittivity of the composites consisting of rubber silicone compound and electroconductive fine-dispersed silver-coated copper powder were investigated. To enhance the effectiveness of the composite interaction with microwaves and reduction of its weight and dimensions characteristics two and three-layer constructions were produced. Matching layers were made of foam glass material with addition SiC and Fe3O4.

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The foam-glass material for a radio frequency echoless chambers

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/110/1/012086 ◽

2016 ◽

Vol 110 ◽

pp. 012086

Author(s):

O Kazmina ◽

V Suslyaev ◽

K Dorozhkin ◽

V Kuznetsov ◽

E Lebedeva

Keyword(s):

Radio Frequency ◽

Foam Glass ◽

Glass Material

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Complex Permittivity, Permeability and Microwave Absorption Studies of Double Layer Magnetic Absorbers Based on BaFe12O19 and BaFe10CoZnO19

Materials Science Forum ◽

10.4028/www.scientific.net/msf.966.302 ◽

2019 ◽

Vol 966 ◽

pp. 302-307

Author(s):

Erfan Handoko ◽

Iwan Sugihartono ◽

Mangasi Alion Marpaung ◽

Ucu Cahyana ◽

Sovian Aritonang ◽

...

Keyword(s):

Microwave Absorption ◽

Double Layer ◽

Complex Permittivity ◽

Network Analyzer ◽

X Ray Diffraction ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

Matching Layer ◽

X Band ◽

Absorption Studies

Microwave absorption properties of double layer magnetic absorbers based on BaFe12O19 (BFO) and BaFe10CoZnO19 (BFCZO) have been investigated in X-band (8.2–12.4 GHz) frequencies. The BFO and BFCZO were prepared by using a solid state reaction process. The crystalline structures were investigated by X-ray diffraction (XRD), The complex permittivity and permeability are determined using Vector Network Analyzer (VNA) in a range from 8.2 GHz to 12.4 GHz. The double layer magnetic absorbers, composed of the BFO as matching layer and the BFCZO as absorption layer, with a total thickness of 5 mm, showed an effective reflection loss (RL) an effective absorbing bandwidth below –5 dB.

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RADIO-WAVES REFLECTION AT REMOTE SENSING OF UNDERLYING COVERS

Civil Aviation High TECHNOLOGIES ◽

10.26467/2079-0619-2019-22-3-57-66 ◽

2019 ◽

Vol 22 (3) ◽

pp. 57-66

Author(s):

L. P. Ligthart ◽

A. I. Kozlov ◽

A. I. Logvin ◽

I. V. Avtin

Keyword(s):

Remote Sensing ◽

Complex Permittivity ◽

Complex Dielectric Constant ◽

Radio Waves ◽

Soil Composition ◽

Main Method ◽

Monitoring Task ◽

Matching Layer ◽

Monitoring Technologies ◽

Parabolic Layer

Monitoring technologies are rapidly developing at present and allow to extract and use non-coordinate information about objects. Noncoordinate information is the information about the type and properties of an object under study. Remote sensing is the main method of solving monitoring problems where special positioning belongs to the radar methods, based on space-time processing of signals and, in particular, on methods of radio polarimetry. It is necessary to have information about the surface in order to solve the monitoring task. The slightest changes in the electrical and physical properties of such areas as salinity, humidity, soil composition, etc. will lead to a change in the basic electrodynamics of the surface, notably its complex dielectric permittivity. The article demonstrates the precise solutions to the problems of radio-waves reflection from a layered surface with various laws of changes of the complex permittivity  in depth. Media with exponential and quadratic laws of variation  for arbitrary angles of incidence of the radio wave on the surface are considered. Precise decision is obtained for layered media with the law of change in the complex permittivity the polynomial and linear characteristics. A similar problem for the parabolic layer is considered separately. The detailed analysis of radio waves reflection from the medium with a matching layer is carried out. The nature of the electromagnetic field inside the transition layer is studied in detail. The article is illustrated by the graphs showing the dependences of an electromagnetic wave reflection coefficient on the layered medium with linear and exponential laws of variation of the complex dielectric constant over depth.

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