KR102232193B1 - Electromagnetic wave absorbing structure with lighting protection system and manufacturing method of the same - Google Patents

Abstract

Various embodiments of the present invention relate to an electromagnetic wave absorber having lightning protection performance. The electromagnetic wave absorber having lightning protection performance comprises: a pattern layer in which a metal is deposited on both sides of a polymer film having a designated pattern, which transmits electromagnetic waves of a specific frequency band; a plurality of dielectric layers including dielectric fibers; and an electromagnetic wave absorbing layer including the dielectric fiber coated with nickel. A stacked structure in which the pattern layer or the electromagnetic wave absorbing layer is interposed between the plurality of dielectric layers may be included. Various other embodiments of the present invention are possible.

Description

Electromagnetic wave absorber having lightning protection and its manufacturing method {ELECTROMAGNETIC WAVE ABSORBING STRUCTURE WITH LIGHTING PROTECTION SYSTEM AND MANUFACTURING METHOD OF THE SAME}

Various embodiments to be described later relate to an electromagnetic wave absorber having lightning protection and a method of manufacturing the same.

Radar reflection area (RCS) is a quantitative measure of the power density of backscattering for a radar receiver when electromagnetic waves are incident on an object, and this RCS reduction technique is an essential technique to improve the survivability of military aircraft. Stealth technologies to reduce RCS include shaping technology and radar absorbing materials. However, with the development of radar technology, it has become difficult to guarantee the survivability of aircraft only by applying shape design technology. In addition, the electromagnetic wave absorbing material has disadvantages such as low durability, increased weight, and toxicity of the material. In order to supplement the existing technology, a radar absorbing structure in which the structure itself supporting the load can absorb electromagnetic waves has been proposed, and research on this has been actively conducted.

In addition, among the various operating environments encountered by aircraft, lightning strikes are an element that poses a fatal threat, accompanied by high-temperature thermal energy and strong electromagnetic fields. In preparation for this, representative aircraft companies are applying Lightning Protection System (LPS), which can protect against lightning, such as CM (Copper Mesh) and EMF (Expanded Metal Foil), to aircraft. In the LPS, a material with high electrical conductivity such as copper is used to prevent damage to local areas by rapidly diffusing electricity from lightning. However, a material with high electrical conductivity can absorb an electric field among the energy of a lightning strike, but reflects all magnetic fields, so there is a problem in that it is vulnerable to electromagnetic wave absorption.

Various embodiments disclosed in this document include a lightning protection layer in which a specified metal pattern is deposited so that there is no loss in radar absorption performance in a certain frequency band, and a plurality of layers made of dielectric fibers or metal-coated dielectric fibers are stacked. An electromagnetic wave absorber having a protective performance can be provided.

In addition, various embodiments are the fabrication of an electromagnetic wave absorber having lightning protection, including the process of designing a pattern of the lightning protection layer and the thickness of a plurality of layers constituting the electromagnetic wave absorber so as to simultaneously have the lightning protection performance while minimizing the decrease in the electromagnetic wave absorption performance. Can provide a way.

The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

An electromagnetic wave absorber having lightning protection according to various embodiments may include, for example, a pattern layer in which metal is deposited on both surfaces of a polymer film on which a designated pattern for transmitting electromagnetic waves of a specific frequency band is formed; A plurality of dielectric layers including dielectric fibers; And an electromagnetic wave absorbing layer including dielectric fibers coated with nickel, and the pattern layer or the electromagnetic wave absorbing layer may be interposed between the plurality of dielectric layers.

In various embodiments, the designated pattern may have a spiral square pattern arranged in a matrix form.

In various embodiments, the polymer film may be a polyimide film.

In various embodiments, the metal may include silver (Ag).

In one embodiment, the plurality of dielectric layers include a first dielectric layer, a second dielectric layer, a third dielectric layer, and a fourth dielectric layer, the electromagnetic wave absorbing layer includes a first electromagnetic wave absorbing layer and a second electromagnetic wave absorbing layer, and the first dielectric layer , A pattern layer, a second dielectric layer, a first electromagnetic wave absorbing layer, a third dielectric layer, a second electromagnetic wave absorbing layer, and a fourth dielectric layer may be stacked in this order.

In one embodiment, the first electromagnetic wave absorbing layer and the second electromagnetic wave absorbing layer have different thicknesses, the first dielectric layer and the second dielectric layer have the same thickness, and the second dielectric layer, the third dielectric layer, and the fourth dielectric layer are The thickness can be formed differently.

A method of manufacturing an electromagnetic wave absorber having lightning protection according to various embodiments includes, for example, a pattern layer having a certain metal pattern formed thereon, a dielectric layer including dielectric fibers, and an electromagnetic wave absorbing layer including dielectric fibers coated with nickel. A method of manufacturing an electromagnetic wave absorber, comprising: designing a shape of the pattern of the pattern layer and a deposition thickness of the metal; Designing the number, stacking order and thickness of the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer; Forming the pattern layer; Laminating the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer according to the designed order and the thickness; And thermally curing the stacked pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer.

In various embodiments, the shape of the pattern may be designated as a spiral square pattern as a pattern that transmits electromagnetic waves in a specific frequency band.

In various embodiments, the process of forming the pattern layer may include a process of processing the pattern on a polyimide film, and a process of depositing the metal on both surfaces of the polyimide film.

In various embodiments, the metal may include silver (Ag).

In various embodiments, the process of designing the number, stacking order and thickness of the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer may include optimizing the thickness of the dielectric layer and the electromagnetic wave absorbing layer.

In various embodiments, the process of laminating the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer according to the designed sequence and the thickness may include laminating the dielectric layer in which the dielectric fiber is impregnated into a resin substrate, and the nickel is coated. It may include a process of laminating the electromagnetic wave absorbing layer impregnating the resulting dielectric fiber into the resin substrate.

The electromagnetic wave absorber having lightning protection according to various embodiments may dissipate electromagnetic energy caused by the lightning while at the same time reducing loss of electromagnetic wave absorption performance due to a designated metal pattern formed on the lightning protection layer.

In the method of manufacturing an electromagnetic wave absorber having lightning protection according to various embodiments, it is easy to control electrical properties by adjusting the thickness of a metal pattern deposited on the lightning protection layer, and the stacking order and thickness of a plurality of layers constituting the electromagnetic wave absorber It is possible to produce an electromagnetic wave absorber with excellent electromagnetic wave absorption performance through the design of such as.

The effects obtainable in the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. will be.

1 is a cross-sectional view of an electromagnetic wave absorber having lightning protection according to various embodiments.
2A illustrates a spiral square pattern formed in an electromagnetic wave absorber having lightning protection according to various embodiments of the present disclosure.
2B shows a Jerusalem Cross pattern as an example for comparing the pattern of FIG. 2A with the electromagnetic wave absorption performance.
3 is a view showing the electromagnetic wave absorption performance of the electromagnetic wave absorber having the pattern according to FIGS. 2A and 2B.
4 is a diagram illustrating a complex dielectric constant of dielectric fibers and nickel-coated dielectric fibers forming respective layers of an electromagnetic wave absorber having lightning protection according to various embodiments of the present disclosure.
5 is a flowchart of a method of manufacturing an electromagnetic wave absorber having lightning protection performance according to various embodiments of the present disclosure.
6 is a graph showing electromagnetic wave absorption performance according to the thickness of a plurality of layers included in an electromagnetic wave absorber having lightning protection according to various embodiments of the present disclosure.
7 is a photograph illustrating a part of a process of forming a pattern layer included in an electromagnetic wave absorber having lightning protection according to various embodiments.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings.

Various embodiments of the present document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutes of the corresponding embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the above items unless clearly indicated otherwise in a related context. In this document, “A or B”, “at least one of A and B”, “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “A Each of the phrases such as "at least one of, B, or C" may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the component from other Order) is not limited.

1 is a cross-sectional view of an electromagnetic wave absorber having lightning protection according to various embodiments.

Referring to FIG. 1, an electromagnetic wave absorber 100 having lightning protection performance according to various embodiments may include a plurality of layers, and may be formed in a sandwich structure in which a plurality of layers are stacked. The electromagnetic wave absorber 100 may include a pattern layer 110, a dielectric layer 120, and an electromagnetic wave absorbing layer 130.

In various embodiments, the pattern layer 110 may be formed by depositing a metal having high electrical conductivity on both surfaces of a polymer film on which a designated pattern is formed. Electric energy due to lightning may be transferred to the ground by the metal deposited on the pattern layer 110 or dissipate the electric energy during the transfer. The polymer film may be a polyimide (PI) film. Since polyimide has excellent heat resistance and has little change in properties from low temperature to high temperature, the pattern layer 110 may not be melted with thermal energy generated by lightning strikes, or its properties or shape may not be deformed. Accordingly, the electromagnetic wave absorber 100 including the pattern layer may have excellent lightning protection performance. In addition, the pattern layer 110 may have a frequency selection characteristic capable of transmitting an electromagnetic wave in a specific frequency band by having a designated pattern in both the polyimide film and the metal thin film. Here, the specific frequency band may be, for example, an X-band (a radar having a wavelength of 2.5 cm) in a frequency band of 8 to 12 GHz. In addition, the metal deposited on both sides of the polyimide film may include silver (Ag).

In various embodiments, the electrical conductivity of the pattern layer may be controlled by controlling the thickness of the metal deposited on the pattern layer. In one embodiment, the electrical conductivity of the pattern layer was measured as 1.25e+6 S/m.

In various embodiments, the dielectric layer 120 may be formed by impregnating a dielectric fiber into a resin substrate. For example, the dielectric fibers may be glass fibers, and the resin substrate may be an epoxy resin. The electromagnetic wave absorbing layer 130 may be formed by impregnating a resin substrate with a dielectric fiber coated with nickel. For example, for example, the dielectric fiber may be a glass fiber, and the resin substrate may be an epoxy resin. By coating nickel on the dielectric fiber, the complex dielectric constant of the dielectric fiber is changed, and the electromagnetic wave absorbing layer 130 can exhibit an electromagnetic wave absorption performance of 90% or more in a broadband.

4 is a diagram illustrating complex dielectric constants of dielectric fibers and nickel-coated dielectric fibers forming each layer of an electromagnetic wave absorber having lightning protection according to various embodiments of the present disclosure.

4, the dielectric layer 120 uses a dielectric fiber, the electromagnetic wave absorbing layer 130 uses a dielectric fiber coated with nickel, and the dielectric fiber has a complex dielectric constant of 4.57-j0.05, and nickel is coated. The resulting dielectric fiber may have a complex dielectric constant of 6.823-j5.53.

In the embodiment shown in FIG. 1, the electromagnetic wave absorber 100 may include a plurality of layers, and the pattern layer 110 or the electromagnetic wave absorbing layer 130 is interposed between the plurality of dielectric layers 120. I can have it. As shown, the electromagnetic wave absorber 100 may include a total of 7 layers, and may be stacked in the order of a dielectric layer, a pattern layer, a dielectric layer, an electromagnetic wave absorbing layer, a dielectric layer, an electromagnetic wave absorbing layer, and a dielectric layer from below.

In one embodiment, the plurality of dielectric layers 120 include a first dielectric layer 121, a second dielectric layer 122, a third dielectric layer 123, and a fourth dielectric layer 124, and the electromagnetic wave absorbing layer 130 is Including the 1 electromagnetic wave absorbing layer 131 and the second electromagnetic wave absorbing layer 132, the first dielectric layer 121, the pattern layer 110, the second dielectric layer 122, the first electromagnetic wave absorbing layer 131, the third dielectric layer ( 123), the second electromagnetic wave absorbing layer 132 and the fourth dielectric layer 124 may be stacked in that order.

In one embodiment, each of the plurality of layers constituting the electromagnetic wave absorber 100 may have a thickness optimized to maximize the electromagnetic wave absorbing performance while the electromagnetic wave absorber 100 has lightning protection performance. The first dielectric layer 121 may be 0.39 mm, the pattern layer 110 may be 0.1 mm, the second dielectric layer 122 may be 0.39 mm, and the first electromagnetic wave absorbing layer 131 may be 0.585 mm. In addition, the third dielectric layer 123 may be 0.65 mm, the second electromagnetic wave absorbing layer 132 may be 0.819 mm, and the fourth dielectric layer 124 may be 0.52 mm. Accordingly, the electromagnetic wave absorber 100 according to an embodiment may have a total thickness of 3.454 mm and exhibit an electromagnetic wave absorption performance of -10 dB or more, that is, 90% or more in a frequency band of 10.26 to 11.06 GHz.

2A illustrates a spiral square pattern formed in an electromagnetic wave absorber having lightning protection according to various embodiments of the present disclosure. 2B shows a Jerusalem Cross pattern as an example for comparing the pattern of FIG. 2A with the electromagnetic wave absorption performance. 3 is a view showing the electromagnetic wave absorption performance of the electromagnetic wave absorber having the pattern according to FIGS. 2A and 2B.

2A, 2B, and 3, the spiral square pattern 111 shown in FIG. 2A and the Jerusalem Cross pattern 10 shown in FIG. 2B select a frequency for transmitting electromagnetic waves in a specific frequency band. Represents a pattern with frequency selective surface characteristics. An electromagnetic wave absorber having a metal surface formed to transmit or dissipate electrical energy from a lightning strike to the ground may have a very large loss of electromagnetic wave absorption performance. Accordingly, in order to have lightning protection performance and at the same time preserve the electromagnetic wave absorption performance, a metal for lightning protection may be formed in a certain pattern that transmits electromagnetic waves in a specific frequency band. As an example, the spiral square shown in FIG. 2A square) pattern and the Jerusalem Cross pattern shown in FIG. 2B.

3 is a graph comparing the electromagnetic wave absorption performance of an electromagnetic wave absorber not including a metal pattern layer for lightning protection and an electromagnetic wave absorber having a pattern according to FIGS. 2A and 2B. Referring to FIG. 3, a metal for lightning protection It can be seen that the electromagnetic wave absorber that does not include the pattern layer has excellent electromagnetic wave absorption performance in a wider frequency band, and when the electromagnetic wave absorber includes a metal pattern layer for lightning protection, it is known that the electromagnetic wave absorption performance varies depending on the type of pattern. I can. As shown in FIG. 3, it can be seen that the electromagnetic wave absorber including the spiral square metal pattern layer can better absorb the electromagnetic wave in a frequency band near 10 GHz than the electromagnetic wave absorber including the Jerusalem Cross metal pattern layer. Accordingly, a pattern formed on a pattern layer included in the electromagnetic wave absorber 100 having lightning protection according to various embodiments may be designated as a pattern in which a spiral square pattern is arranged in a matrix form. The electromagnetic wave absorber 100 having lightning protection according to various embodiments may exhibit an electromagnetic wave absorption performance of -10 dB or more, that is, 90% or more, in a frequency band of 10.26 to 11.06 GHz.

5 is a flowchart of a method of manufacturing an electromagnetic wave absorber having lightning protection performance according to various embodiments of the present disclosure.

Referring to FIG. 5, a method 200 of manufacturing an electromagnetic wave absorber having a lightning protection performance according to various embodiments includes a process of designing a pattern having a frequency selection characteristic (210), and a process of designing a structure of the electromagnetic wave absorber (220). , A process 230 of forming a pattern layer, a process 240 of laminating the structure of an electromagnetic wave absorber, and a process 250 of thermally curing the laminated structure.

In various embodiments, the process 210 may include designing a pattern shape and a metal deposition thickness of a pattern layer on which a predetermined metal pattern is formed. In the process 210, the shape of the pattern may be designated so that the pattern layer has a frequency selection characteristic capable of transmitting electromagnetic waves in a specific frequency band. In the process 210, among patterns having frequency selection characteristics, a pattern having excellent electromagnetic wave absorption performance may be designated as the shape of the pattern by testing the electromagnetic wave absorption performance of the electromagnetic wave absorber including the patterns. In various embodiments, the shape of the pattern may be designated as a spiral square pattern shown in FIG. 2A.

In the process 210, the deposition thickness of the metal pattern formed on the pattern layer may be designed in consideration of electrical conductivity. That is, in the process 210, the deposition thickness of the metal pattern may be selected so that the pattern layer has an appropriate electrical conductivity in order to transmit electric energy due to lightning to the ground or dissipate during the transfer. In addition, in the process 210, the metal may be designed to contain silver (Ag) having high electrical conductivity.

In various embodiments, the process 220 of designing the structure of the electromagnetic wave absorber may design a sandwich structure of the electromagnetic wave absorber including the dielectric layer, the pattern layer, and the electromagnetic wave absorbing layer, and in more detail, the number of the pattern layer, the dielectric layer and the electromagnetic wave absorbing layer , Lamination order and thickness can be designed. In the process 220, a computer simulation may be attempted to design a structure having excellent electromagnetic wave absorption performance.

In the process 220, the electromagnetic wave absorber 100 includes a total of 7 layers, and may be designed to be stacked in the order of a dielectric layer, a pattern layer, a dielectric layer, an electromagnetic wave absorbing layer, a dielectric layer, an electromagnetic wave absorbing layer, and a dielectric layer from below.

In the process 220, the plurality of dielectric layers 120 include a first dielectric layer 121, a second dielectric layer 122, a third dielectric layer 123 and a fourth dielectric layer 124, and the electromagnetic wave absorbing layer 130 Silver includes a first electromagnetic wave absorbing layer 131 and a second electromagnetic wave absorbing layer 132, the first dielectric layer 121, the pattern layer 110, the second dielectric layer 122, the first electromagnetic wave absorbing layer 131, the third The dielectric layer 123, the second electromagnetic wave absorbing layer 132, and the fourth dielectric layer 124 may be sequentially stacked.

In various embodiments, the process 220 may include optimizing thicknesses of the dielectric layer and the electromagnetic wave absorbing layer.

6 is a graph showing electromagnetic wave absorption performance according to the thickness of a plurality of layers included in an electromagnetic wave absorber having lightning protection according to various embodiments of the present disclosure. Table 1 shows the thickness of each layer of an electromagnetic wave absorber including a total of 7 layers according to an exemplary embodiment.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Optimization example Fourth dielectric layer 0.52 0.52 0.52 0.52 Second electromagnetic wave absorption layer 0.585 0.52 0.936 0.819 Third dielectric layer 0.702 0.65 1.053 0.65 First electromagnetic wave absorption layer 0.819 0.65 0.936 0.585 Second dielectric layer 0.39 0.39 0.39 0.39 Pattern layer 0.1 0.1 0.1 0.1 First dielectric layer 0.39 0.39 0.39 0.39

Referring to Tables 1 and 6, even if the electromagnetic wave absorber has a structure in which a plurality of layers are stacked identically, when the thickness of each layer is different, the electromagnetic absorption performance may be different. Accordingly, in the process 220, the thickness of each layer can be optimized so that the electromagnetic wave absorber exhibits optimal electromagnetic wave absorption performance. In an embodiment in which the thickness of each layer is optimized, the first dielectric layer 121 may be 0.39 mm, the pattern layer 110 may be 0.1 mm, the second dielectric layer 122 may be 0.39 mm, and 1 The electromagnetic wave absorbing layer 131 may be 0.585 mm, the third dielectric layer 123 may be 0.65 mm, the second electromagnetic wave absorbing layer 132 may be 0.819 mm, and the fourth dielectric layer 124 may be 0.52 mm. I can. The electromagnetic wave absorber 100 according to an embodiment in which the thickness is optimized has a total thickness of 3.454 mm and may exhibit an electromagnetic wave absorption performance of -10 dB or more, that is, 90% or more in a frequency band of 10.26 to 11.06 GHz.

In various embodiments, the process 230 of forming the pattern layer may include a process 231 of processing a pattern on the polyimide film, and a process 232 of depositing a metal on the polyimide film on which the pattern has been processed. have. In the process 230, the pattern layer may be formed by reflecting the pattern processed on the polyimide film and the deposited metal design in the process 210. In the process 231 of processing the pattern on the polyimide film, the pattern may be processed on the polyimide (PI) film using a laser cutting machine. The laser cutting machine is a precision machine with an error of 0.02 mm, and can process patterns faster with higher accuracy than a conventional cutting method using a blade. In addition, since the pattern is directly processed on the polyimide film, costs that may occur in laser cutting can be significantly reduced compared to the case of processing the pattern directly on metal with a laser cutting machine.

In various embodiments, the process 232 of depositing a metal on a patterned polyimide film may perform metal, particularly, silver (Ag) deposition using a thermal evaporation equipment. In the process 232, the deposition thickness of the metal may be adjusted, and electrical properties such as electrical conductivity of the pattern layer may be controlled by adjusting the thickness of the deposited metal.

7 is a photograph illustrating a part of a process of forming a pattern layer included in an electromagnetic wave absorber having lightning protection according to various embodiments.

Referring to FIG. 7, the first photo (A) is a photo after processing a pattern in which a spiral square pattern is periodically arranged on a polyimide film, and the second photo (B) is a polyimide with a pattern processed. This is a picture after depositing silver on both sides of the film. Accordingly, a pattern layer manufactured by a manufacturing method according to various embodiments or a pattern layer according to various embodiments may include a metal pattern in which a spiral square pattern is arranged in a matrix form.

In various embodiments, in the process 240 of stacking the structure of the electromagnetic wave absorber, the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer may be laminated according to the order and thickness designed in the process 220. The process 240 may include laminating the dielectric layer 241 impregnating the dielectric fiber into the resin substrate and laminating an electromagnetic wave absorbing layer impregnating the dielectric fiber coated with nickel into the resin substrate 242. . In this case, the dielectric fiber may be glass fiber, the resin substrate may be epoxy, and the lamination method may be performed in a hand lay-up method.

In various embodiments, the process 250 of thermally curing the laminated structure includes a metal pattern layer by curing the electromagnetic wave absorber completed in the process 240 using an autoclave process, thereby providing an electromagnetic wave absorber having lightning protection performance. Can be completed.

Claims (12)

A pattern layer in which metal is deposited on both surfaces of a polymer film in which a specified pattern in which a spiral square pattern transmitting electromagnetic waves of a specific frequency band is arranged in a matrix form or a designated pattern in a Jerusalem Cross form is formed;
A plurality of dielectric layers including dielectric fibers; And
Including an electromagnetic wave absorbing layer comprising a dielectric fiber coated with nickel,
The electromagnetic wave absorption layer exhibits an electromagnetic wave absorption performance of -10 dB or more or 90% or more in a frequency band of 10.26 GHz to 11.06 GHz in a broadband,
An electromagnetic wave absorber having a lightning protection performance, having a laminated structure in which the pattern layer or the electromagnetic wave absorbing layer is interposed between the plurality of dielectric layers.
delete The method according to claim 1,
The polymer film is a polyimide film, an electromagnetic wave absorber having a lightning protection performance.
The method according to claim 1,
The metal contains silver (Ag), an electromagnetic wave absorber having a lightning protection performance.
The method according to claim 1,
The plurality of dielectric layers include a first dielectric layer, a second dielectric layer, a third dielectric layer, and a fourth dielectric layer,
The electromagnetic wave absorbing layer includes a first electromagnetic wave absorbing layer and a second electromagnetic wave absorbing layer,
The first dielectric layer, the pattern layer, the second dielectric layer, the first electromagnetic wave absorbing layer, the third dielectric layer, the second electromagnetic wave absorbing layer and the fourth dielectric layer are stacked in the order of, the electromagnetic wave absorber having lightning protection performance.
The method of claim 5,
The first electromagnetic wave absorbing layer and the second electromagnetic wave absorbing layer have different thicknesses,
The first dielectric layer and the second dielectric layer have the same thickness, and the second dielectric, the third dielectric layer, and the fourth dielectric layer have different thicknesses.
In the method of manufacturing an electromagnetic wave absorber comprising a pattern layer in which a certain metal pattern is formed, a dielectric layer comprising dielectric fibers, and an electromagnetic wave absorbing layer comprising dielectric fibers coated with nickel,
Designing a deposition thickness of the metal on both surfaces of a polymer film of a pattern layer in which a specified pattern in which a spiral square pattern transmitting electromagnetic waves of a specific frequency band is arranged in a matrix form or a specified pattern in a Jerusalem Cross form is formed;
Designing the number, stacking order and thickness of the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer;
Forming the pattern layer;
Laminating the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer according to the designed order and the thickness; And
Including the process of thermally curing the electromagnetic wave absorbing layer to exhibit an electromagnetic wave absorption performance of -10 dB or more or 90% or more in a frequency band of 10.26 GHz to 11.06 GHz in the stacked pattern layer, the dielectric layer, and a broadband Method for producing an electromagnetic wave absorber having.
The method of claim 7,
The shape of the pattern is a pattern that transmits electromagnetic waves of a specific frequency band and is designated as a spiral square pattern, a method of manufacturing an electromagnetic wave absorber having lightning protection.
The method of claim 7,
The process of forming the pattern layer,
The process of processing the pattern on a polyimide film, and
A method of manufacturing an electromagnetic wave absorber having lightning protection, comprising the process of depositing the metal on both surfaces of the polyimide film.
The method of claim 7,
The metal contains silver (Ag), a method of manufacturing an electromagnetic wave absorber having lightning protection performance.
The method of claim 7,
The process of designing the number, stacking order and thickness of the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer,
A method of manufacturing an electromagnetic wave absorber having lightning protection, comprising the step of optimizing the thickness of the dielectric layer and the electromagnetic wave absorbing layer.
The method of claim 7,
The process of laminating the pattern layer, the dielectric layer, and the electromagnetic wave absorbing layer according to the designed order and the thickness,
Laminating the dielectric layer in which the dielectric fiber is impregnated into a resin substrate, and
A method of manufacturing an electromagnetic wave absorber having lightning protection, comprising laminating the electromagnetic wave absorbing layer in which the nickel-coated dielectric fiber is impregnated into a resin substrate.

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