Radio-absorbing cover

FIELD: radio-electric engineering.

SUBSTANCE: cover is formed in form of layer on basis of fiber, placed between outer and inner layers of dielectric materials. Fiber layer along thickness is formed of several cloths of textile material of synthetic filaments with carbon cover with specific electrical, in which adjacent cloths are interconnected by inserts of given thickness on basis of dielectric connecting substance. Outer layer is made of rubber. Inner layer is made of dielectric connecting substance, containing granulated material, weakening reflection of electro-magnetic waves, in amount of 5-25% of total.

EFFECT: higher efficiency.

3 cl, 1 dwg

 

The invention relates to electrical engineering and can be used to create screens that absorb electromagnetic waves (hereinafter EMW) in the microwave range.

Known multi-layer coating to absorb the electromagnetic wave on the basis of disperse systems in the form of powder, ferrite or carbonyl iron with a binder, which is used as a synthetic glue “Elton-based latex (see RF patent №2107705, 1998 09 D 5/32). This coating provides attenuation of energy EMW on 7-18 dB in the microwave range at a coating thickness of about 1 mm, the Disadvantage of this coating is the difficulty of ensuring the uniformity of the specified properties of the coating during the coating process on the surface of the protected equipment, have different shape and different that are oriented in space. To address this shortcoming will be useful to perform the multilayer coating with remote control the reflective properties of coatings on objects after application of each layer (see RF patent №2155420, 2000 09 D 5/32). Application of this technology involves using sophisticated equipment and with a significant complication of the manufacturing process of the coating.

Known coating for absorption of electromagnetic waves, made in the form of a flat layer of dielectric material (liquid glass) of a thickness of 1-2 mm from the chaotic RA is definitely in the amount of 6.8%. segments of thread length 2-5 mm carbon fiber “plan”, perpendicular to it, are density 6,8-8,5% vol. thread length 15-18 mm of carbon fibers “plan and thread length 20 mm from the dielectric material (see SU 1790795 A3, H 01 Q 17/00, 1990). The manufacture of such coverage is associated with a complex preparation of the initial components of filaments of a given length for each layer, and is also needed in the manufacturing process of the coating to ensure strict orientation of the filaments in the coating layer.

Known coating to absorb EMR, made in the form of three layers, of which the outer and inner layers made of dielectric materials with a dielectric constant of 1.2-1.4 and a thickness of 0.5-1 mm and 0.15-0.25 mm, respectively, and between them is a layer of electrically conductive material with a resistivity of 0.1-15 Ohm·cm and a thickness of 0.5 mm (see SU 1786567 A1, H 01 Q 17/00, 1993). Lack of coverage is fairly narrow range of absorption of electromagnetic wave.

Known coating to absorb radiation of the radar, which is described in U.S. patent No. 5661484, CL H 01 Q 17/00, 1996. According to this patent absorbing coating contains a conductive non-magnetic straight fibers of the first type, length, diameter and volume were selected to receive the first dielectric, conductive, non-magnetic straight fiber Deuteronomy is the second type, length, diameter and amount of which are selected to obtain a second dielectric constant, and dielectric binder with a relatively low dielectric losses for binding the fibers of the first and second types in a single material so that the fibers of the first and second types of randomly oriented and uniformly distributed in the volume of binder in a single layer. Such absorbent material has a complex dielectric permittivity, which allows the material to absorb electromagnetic wave in a wide range. The fibers of the first type are made of graphite T300 or AS-4 with a small diameter and have a relatively high electric resistance. Fibers of the second type are made of metals - stainless steel, Ni, cu, and graphite-coated. As the dielectric material used rubber or polymers. The disadvantages are the complexity of the production technology and high cost.

Well-known textile material, decreasing the reflection of the radar signal representing placed between two layers of polymer fabric, the cavity between the threads of the fabric are filled with the material, decreasing the reflection of the electromagnetic wave (see U.S. patent No. 5817583, 32 In 7/00, 1994), which is closest to the proposed. As the material, decreasing the reflection of the electric wave can be used g is analy carbon carbon fiber with a small length of fiber, carbonyl iron, ferrites, metallic microspheres. To enhance the effectiveness of coating polymers can also contain components that reduce the reflection of the electric wave. The advantage of this coating is that of the textile base allows you to put it on equipment of different forms. The disadvantage of this coating is the complexity of manufacturing such coverage due to the complexity of ensuring reliable coupling between the absorbing coating layer and the layer of polymer coating.

An object of the invention is to increase the efficiency of absorption of electromagnetic wave in a relatively wide range, as well as achieving a more uniform characteristics of the EMR absorption when exposed to radar objects of various shapes. In addition, the goal is to use materials that would provide the ease of manufacture of coatings and stability of its characteristics.

This object is achieved in that the coating to absorb the electromagnetic wave is formed as a layer on the basis of fabric placed between the outer and inner layers of dielectric material, and a fabric layer thickness is formed of several panels of textile material of synthetic fibres with a coating of carbon with a specific electrical resistance of the filament 4 to 6 kω/cm, neighboring OTA interconnected layers of specified thickness on the basis of the dielectric binder, the outer layer is made of rubber and an inner layer made of a dielectric binder containing granular material, decreasing the reflection of the electric wave in the range from 5 to 25% vol.

In the private embodiment, a dielectric binder between the layers of textile material contains weaken the reflection of the electric wave granular material in an amount of 5 to 25% vol.

In another private embodiment of the invention, the granular material is used, the granules of carbon, carbonyl iron, ferrites, metallic microspheres and microspheres on the basis of phenol.

Technical result achieved with the claimed invention, is that when using experimentally found by the authors of the combination of properties of the coating can improve the effectiveness of radar absorbing coatings gradient type due to parallel flow in the coating processes of the interference energy absorption EMW.

The invention is illustrated by the drawing, which shows a cross-section of the inventive coating.

Coverage includes (see drawing) of the outer (1) and inner (2) layers, multiple (the drawing shows two paintings (3) textile material of synthetic fibres with a coating of carbon layers (4) dielectric connections the existing substances connecting the blade (3), external (1) internal and (2) layers in a single coating for absorption of EMR. The outer layer (1) coating made of rubber, which contains from 25 to 49 wt.%. carbon, for example of rubber stamps MBS or TMCs. The thickness of the layer (1) is set in the range from 1 to 3 mm to ensure alignment of the dielectric properties of the absorbing layers of the coating and free space. The inner layer (2) coating is formed using a dielectric binders, which are used as, for example, synthetic elastomers, synthetic rubbers and their derivatives (see Jshields. Adhesive materials. M: mechanical engineering, 1980, p.35-36, p.77-231). The inner layer (2) coating is applied on the metal base (5)which is directly or surface of the protected object, or a metal foil (foil is used in the case of draping object paintings of the protective coating).

In the volume of the inner layer (2) contains from 5 to 25% vol. granules (6), decreasing the reflection of the electric wave. The formation of the required thickness of the inner layer (2) is carried out in accordance with the following process of manufacturing and coating on the surface of the protected equipment. In the composition of the layers (4) dielectric binder may be introduced from 5 to 25% vol. the grain is (7), decreasing the reflection of the electric wave. Material (5) and (6) are used in the form of granules of carbon, carbonyl iron, ferrites, metallic microspheres and microspheres on the basis of phenol, the composition and the optimal parameters are picked or calculated from the specific conditions of use coverage.

The coating directly on the surface of the protected object consists of the following basic operations: A) preparing a metal surface (5), (B) forming the inner layer (2) coating of a given thickness using a mixture of a dielectric binder and one or more of the above described granular materials; C) bonding to the inner layer (2) covering the first piece of textile material (3); G) drawing on the first canvas textile material layer (4) dielectric binder (substance can also contain granular material in the above number) and the adhesion of the second blade (3)E) bonding on the second canvas outer layer (1) made of rubber. If the asset protection EMW absorbing coating is carried out by draping, the manufacturer of the coating is carried out in reverse sequence, and the inner layer (2) covering additionally sealed metal foil.

Studies have shown that the proposed pokr the enterprise has a level of reflection of energy EMW within 5-10% of capacity in the range of 8-12 GHz. The minimum reflectance at a frequency of 10 GHz is about 19 dB.

The energy of the electromagnetic wave incident on the object with the inventive coating is absorbed largely in the threads that make up the fabric (3) textile material and granules (6) and (7). Part of the energy of the electric wave is absorbed at reverse motion of the reflected EMR granules (6) and (7) and thread paintings (3). In addition, the presence of external (1)internal (2) and (4) layers of specified thickness allows additional use of the interference mechanism of energy absorption of the electric wave reflected from the canvases (3) and a metal surface (5) of the protected equipment in a wide wavelength range.

Thus, the claimed coating enables high absorptive capacity in a sufficiently wide frequency range 8-12 GHz and the desired level of reduction reflected power from the surface of the protected equipment. In addition, the inventive coating can significantly simplify the process of coating equipment complex shape due to its elasticity, ease of cutting and connecting pieces of a given configuration and the use of various accommodation options coatings are relatively protected metal surfaces: bonding, drapery, binding, and others. In addition, the use of broad-cloths textile material and rubber, and is also simple binders for forming the inner and intermediate dielectric layers ensures a high stability of characteristics of the antireflection coating.

1. Floor to absorb the electromagnetic wave generated in a layer based on a tissue placed between the outer and inner layers of dielectric material, and a fabric layer thickness is formed of several panels of textile material of synthetic fibres with a coating of carbon with a specific electrical resistance of the filament 4 to 6 kω/cm, adjacent canvases are interconnected layers of specified thickness on the basis of the dielectric binder, the outer layer is made of rubber and an inner layer made of a dielectric binder containing granular material in an amount of 5 to 25% vol.

2. The coating according to claim 1, characterized in that the dielectric binder between the layers of textile material contains weaken the reflection of the electric wave granular material in an amount of 5 to 25% vol.

3. The coating according to claim 2, characterized in that as the granular material is used, the granules of carbon, carbonyl iron, ferrites, metallic microspheres and microspheres on the basis of phenol.



 

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FIELD: radio-electric engineering.

SUBSTANCE: cover is formed in form of layer on basis of fiber, placed between outer and inner layers of dielectric materials. Fiber layer along thickness is formed of several cloths of textile material of synthetic filaments with carbon cover with specific electrical, in which adjacent cloths are interconnected by inserts of given thickness on basis of dielectric connecting substance. Outer layer is made of rubber. Inner layer is made of dielectric connecting substance, containing granulated material, weakening reflection of electro-magnetic waves, in amount of 5-25% of total.

EFFECT: higher efficiency.

3 cl, 1 dwg

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