KR101337543B1 - Textile absorbing electromagnetic wave, aircraft having the same and method of manufacturing absorbing electromagnetic wave - Google Patents

Abstract

The present invention provides fiber absorbing electromagnetic wave in a pre-set frequency band, and the electromagnetic wave absorbing fiber is formed in which nonconductive fibers cross each other so as to create multiple tight gaps, comprising a conductive pattern layer which penetrates a conductive weaving layer divided into multiple unit cells and the tight gaps, and crosses the nonconductive fibers so as to form the pre-set pattern in each unit cell and is formed with conductive fibers to generate electric power between the patterns for absorbing the electromagnetic wave.

Description

FIELD OF THE INVENTION Electromagnetic wave absorbing fiber, air vehicle and electromagnetic wave absorbing fiber manufacturing method including the same {TEXTILE ABSORBING ELECTROMAGNETIC WAVE;

The present invention relates to a woven fabric comprising an electromagnetic wave absorbing fiber body that absorbs electromagnetic waves incident from the outside by a non-conductive material and a conductive material.

In general, as a method of shielding electromagnetic waves, a method using a high conductivity material having excellent electrical conductivity is mainly used. Highly conductive materials, such as metals, reflect high levels of incident electromagnetic waves.

Conventionally, by shielding the electronic device to generate the electromagnetic wave with a high-conducting material to reflect the electromagnetic wave generated from the electronic device to the inside of the electronic device, the electromagnetic wave is shielded from the outside of the electronic device. As a result, an electronic device that is sensitive to electromagnetic waves has a problem that an error is caused or amplified by electromagnetic waves reflected from high conductivity materials. In order to solve this problem, an electromagnetic wave absorber has been proposed.

Dielectric materials, conductive materials, and so on are various materials that constitute the electromagnetic wave absorber. Especially in the case of the resonant electromagnetic wave absorber using the periodic grid pattern, various types of periodic grid pattern layers may be manufactured by coating / printing such materials. do.

When the periodic grid pattern is manufactured by applying conductive paste, there are advantages such as easy printing of pattern, easy control of electric conductivity (surface resistance) of material, fast printing speed, etc. There is a disadvantage that is difficult to apply to the absorber structure. In particular, various difficulties arise in application to fiber-reinforced composite materials requiring high temperature curing process.
The background technology of the present invention is disclosed in Korean Patent Registration No. 10-043452000000 (2004.05.25.).

Accordingly, the technical problem of the present invention is to provide a woven fabric of the electromagnetic wave absorber with improved durability.

The woven fabric according to an embodiment for achieving the above object of the present invention is formed to cause a resonance phenomenon to absorb the electromagnetic wave of a preset frequency band. The electromagnetic wave absorbing fiber is formed such that the non-conductive fibers cross each other to form a plurality of fine gaps, and pass through the non-conductive woven layer and the fine gaps partitioned into a plurality of unit cells and cross the non-conductive fibers. Each unit cell includes a conductive pattern layer formed of a conductive fiber to form a predetermined pattern and to generate an electric force between the patterns to absorb the electromagnetic wave.

As an example related to the present invention, the conductive pattern layer is formed on both sides of the non-conductive woven layer.

As an example related to the present invention, the non-conductive woven layer includes glass fiber or aramid fiber.

As an example related to the present invention, the conductive fiber includes at least one of carbon fiber, metal fiber and conductive powder impregnated fiber.

As an example related to the present invention, the predetermined frequency band may include electrical characteristics (electric conductivity, resistance, dielectric constant, permeability, etc.) of the conductive fiber itself, and the conductive fiber with respect to the non-conductive fiber of the pattern formed in one unit. It corresponds to at least one of the ratio of and the interval between the patterns.

According to another aspect of the present invention, a vehicle includes an absorber including an air vehicle body and an electromagnetic wave woven body to which a predetermined electromagnetic wave is incident from the outside, and the woven fabric includes a plurality of fine gaps in which non-conductive fibers cross each other. And a predetermined pattern for each unit cell by penetrating the non-conductive woven layer and the micro-gap and intersecting the non-conductive fibers, and forming a predetermined pattern for each unit cell, and absorbing the electromagnetic wave. In order to generate an electric force between the patterns may include a conductive pattern layer formed of a conductive fiber.

As an example related to the present invention, one region of the surface of the air vehicle body is formed in a curved surface, and is formed to cover the electromagnetic wave absorbing fiber along the curved surface.

According to another aspect of the present invention, there is provided a method of manufacturing an electromagnetic wave absorbing fiber, by forming a non-conductive woven layer in which non-conductive fibers are woven to form micro cracks, and penetrating conductive fibers between the micro gaps. Forming a set pattern.

According to the present invention having the above configuration, the woven material in which the conductive pattern is formed in the non-conductive woven layer in a manner penetrating the non-conductive woven layer can form a non-conductive pattern in various forms, thereby absorbing electromagnetic waves of various frequency bands. It can be formed to.

In addition, since it is formed of a fiber material, it is easy to form on the curved surface of the body of the aircraft, it is inserted into the surface and interlayer of the fiber-reinforced composite material can be applied as an electromagnetic wave absorbing structure excellent in specific strength / specific strength.

1 is a conceptual diagram showing a flying body formed with electromagnetic wave absorbing fibers of the present invention.
2A and 2B are partially enlarged views for explaining the structure of a woven fabric forming the electromagnetic wave absorber.
3 is a diagram illustrating a pattern layer formed in a plurality of units, respectively.
4A to 4C are diagrams illustrating one unit cell of a non-conductive woven layer including conductive pattern layers having various shapes.

Hereinafter, a target detecting unit according to the present invention will be described in more detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

1 is a conceptual view showing a flying body formed with electromagnetic wave absorbing fibers of the present invention, Figures 2a and 2b is an enlarged view for explaining the structure of the electromagnetic wave absorber.

For example, as shown in FIG. 1, the electromagnetic wave absorber 1000 may be formed on an outer surface of the vehicle. That is, the electromagnetic wave absorber 1000 may be formed or attached on a material constituting the exterior of the vehicle.

In addition, the electromagnetic wave absorbing fiber 1000 may be modified by being formed of the non-conductive woven layer 100 and the conductive fiber 200 formed so that the non-conductive woven layer is woven. In other words, the electromagnetic wave absorbing fiber 1000 may be formed on a curved surface as well as a plane. Accordingly, the electromagnetic wave absorbing fiber 1000 may be formed in close contact with the exterior without changing the appearance of the flying body including the curved surface.

The non-conductive woven layer may be made of a woven fabric, or may include a fibrous layer formed by multi-layering (three-dimensional) by unidirectionally arranging two-dimensional sheets in two directions.

Also, the deformable electromagnetic wave absorbing fiber 1000 may be inserted into a specific configuration. For example, the electromagnetic wave absorbing fiber 1000 may be inserted between the skin and the layers of the multilayer fiber reinforced composite material.

In addition, the electromagnetic wave absorbing fiber 1000 may be formed in various structures as well as a vehicle, and serves to absorb electromagnetic waves incident in various structures. The electromagnetic wave absorbing fiber 1000 may extinguish the electromagnetic wave of the preset frequency band by using the resonance phenomenon of the incident electromagnetic wave.

The conductive fiber is a (high conductivity) electrically conductive fiber, (low conductivity) electrically conductive fiber, high dielectric constant (dielectric fiber), high permeability (magnetic fiber), a hybrid in which the electrical conductivity can be adjusted to any level Fiber may be included.

The electromagnetic wave absorbing fiber 1000 is manufactured by forming a conductive pattern layer 200 in which a conductive fiber is formed in a predetermined pattern on the non-conductive woven layer 100.

The non-conductive woven layer 100 may be formed of glass fibers, aramid fibers, and the like. The conductive fiber may include at least one of carbon fiber, metal fiber and conductive powder impregnated fiber, dielectric fiber, and magnetic fiber.

Referring to FIG. 2A, since the non-conductive fiber layer 100 is formed in a unidirectional array, a multi-directional array, and a woven form, fine gaps 110 may be formed between the non-conductive fibers.

The conductive fiber 200 may be fixed to the nonconductive woven layer 100 by penetrating the microcavity 110 included in the nonconductive woven layer 100. That is, the conductive fiber 200 is formed to cross the non-conductive fiber of the non-conductive woven layer 100.

Referring to FIG. 2B, the conductive fibers 200 are formed on both sides of the nonconductive woven layer 100. That is, the conductive fiber 200 penetrates through the microgroove 110 from one surface of the non-conductive woven layer 200 and is formed on the other surface of the non-conductive woven layer 200, and the conductive fiber is again fine. Penetrating through the groove 110 is formed on the other surface of the non-conductive woven layer 200.

The conductive fiber 200 forms a conductive pattern layer 100 that penetrates the plurality of microgrooves 110 of the nonconductive woven layer 100 to form a predetermined pattern. The pattern of the conductive pattern layer 100 may be formed to correspond to each other on one surface and the other surface of the non-conductive woven layer 100.

In order to manufacture the electromagnetic wave absorbing fiber 1000, the non-conductive woven layer 100 is formed using the non-conductive fiber. The non-conductive woven layer 100 may be formed by a unidirectional / multidirectional arrangement and a weaving method, and the microgroove 110 may be formed.

The conductive fiber 200 is formed to form a predetermined pattern on the non-conductive woven layer 100. The conductive fiber 200 is passed through the plurality of microgrooves 110 to cross the non-conductive fiber forming the non-conductive woven layer 100.

Since the conductive fiber is formed to penetrate the microgroove 110, a conductive pattern layer 200 including a predetermined pattern is formed on both surfaces of the non-conductive woven layer 100 by the conductive wire fiber.

3 is a diagram illustrating a pattern layer formed in a plurality of units, respectively.

Referring to FIG. 3, the non-conductive woven layer 100 is divided into a plurality of unit cells 101, and conductive patterns layers 200 having substantially the same pattern are formed in each unit. The distance D between the conductive pattern layers 200 may be formed to be substantially the same, but the distance may vary according to a design method for absorbing electromagnetic waves.

In addition, the present invention is not limited thereto, and unit cells of various shapes and sizes may be mixed and applied.

The resonance frequency band of the electromagnetic wave absorbable by the conductive pattern layer 200 may be determined. The resistance (R) value of the non-conductive woven layer 100, the interval between the same pattern formed in each unit cell 101 and the ratio of the area of the conductive pattern layer 200 to the area of the one unit The resonance frequency band of the electromagnetic wave may be determined by at least one.

The capacitance value C is determined by the spacing D between the patterns. In addition, the inductance L value may be determined by the ratio of the conductive pattern layer 200 according to the size and shape of the conductive pattern layer 200.

Accordingly, the resonance frequency can be determined by modifying the type of the material forming the conductive pattern layer 200 and the size and shape of the conductive pattern layer, and the correlation between the resonance characteristics of the fiber layer and other members to which the fiber layer is applied. In this case, the incident electromagnetic waves can be extinguished without being reflected / transmitted.

4A to 4C are diagrams illustrating one unit cell 101 of a nonconductive woven layer including a conductive pattern layer 200 having various shapes. The non-conductive woven layer and the conductive pattern layer illustrated in FIGS. 4A to 4C have substantially the same characteristics as the materials and the manufacturing method of the non-conductive woven layer and the conductive pattern layer of FIG. 3. Therefore, redundant description will be omitted.

The conductive pattern layer 201 of FIG. 4A is formed in a spiral structure forming a plurality of corners with respect to the center of the unit cell 101, and the conductive pattern layer 202 of FIG. 4B is a plurality of straight lines arranged in one direction. The conductive pattern layer 203 of FIG. 4C includes a plurality of circular shapes having different diameters sharing a center.

Accordingly, the conductive pattern layer may be implemented in various shapes and sizes so as to be applied to the materials forming the conductive pattern layer and the resonance frequency of the electromagnetic wave to be absorbed.

The conductive pattern layer is not limited to the one shown in the drawings, and according to the purpose and needs, as well as the arrangement in which the unit cell of a kind maintains one interval (for example, multi-frequency band absorption or broadband frequency absorber development, etc.) Multiple period arrays can be designed based on one or more unit cells and one or more intervals. In addition, the conductive fiber may include a periodic array pattern to which various kinds of conductive fibers are applied.

The unit cell is not limited in shape, such as rectangular, rod-shaped, triangular, cross-shaped, star, etc., may be applied by mixing the unit cell, it is possible to apply a variety of scale for each unit cell.

The above-described electromagnetic wave absorbing fiber and the aircraft including the same may not be limitedly applied to the configuration and method of the above-described embodiments, but the embodiments may be all or part of each of the embodiments so that various modifications may be made. It may alternatively be configured in combination.

Claims (8)

Regarding the woven fabric constituting the fiber body for absorbing electromagnetic waves in a predetermined frequency band and forming resonance, the woven fabric,
A non-conductive woven layer which is formed so that the non-conductive fibers cross each other to form a plurality of fine gaps, and is divided into a plurality of unit cells; And
And a conductive pattern layer formed of a conductive fiber to penetrate the microgap and cross the non-conductive fiber to form a predetermined pattern for each unit cell, and to generate an electric force between the patterns to absorb the electromagnetic wave.
The conductive fibers are formed in the non-conductive fibers discontinuously for each unit cell, each of the plurality of patterns are formed to be separated from each other at a predetermined interval as a form independent of each other to limit the electrical connection. Weave. The method of claim 1,
Woven fabrics, characterized in that the conductive pattern layer is formed on both sides of the non-conductive woven layer. The method of claim 1,
The non-conductive woven layer is woven fabric, characterized in that it comprises at least one of glass fiber (glass fabric) and aramid fiber. 3. The method of claim 2,
The conductive fiber comprises at least one of carbon fiber, metal fiber and conductive powder impregnated fiber, dielectric fiber, magnetic fiber. The method of claim 1,
And said predetermined frequency band corresponds to at least one of a ratio of said conductive fibers to said non-conductive fibers of a pattern formed in one unit and a gap between said patterns. Woven according to any one of claims 1 to 5; And
It includes a vehicle body to which a predetermined electromagnetic wave is incident from the outside,
And the woven fabric is formed on at least a portion of the surface of the vehicle body. The method according to claim 6,
One area of the surface of the vehicle body is formed in a curved surface, characterized in that the weave is covered along the curved surface. Non-conductive fibers are woven to form microgaps, and forming a non-conductive woven layer partitioned into a plurality of unit cells;
Forming a predetermined pattern for each unit cell by penetrating the conductive fibers between the unit cells and the fine gaps;
The conductive fiber is formed in the non-conductive fiber discontinuously for each unit cell, each of the plurality of patterns are independent form each other is formed so that the electrical connection is limited to cause a woven phenomenon.

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