KR20230013539A - Fabric for shielding radio frequency domain electromagnetic wave - Google Patents

Abstract

An objective of the present invention is to provide a radio frequency domain electromagnetic wave shielding fabric, which can shield electric field waves in a radio frequency domain and block magnetic field waves. The radio frequency domain electromagnetic wave shielding fabric according to an embodiment of the present invention, which is fabric for shielding radio frequency, the radio frequency range electromagnetic wave shielding fabric, which can shield an electric field and block magnetic field waves in a radio frequency domain, comprises an elliptical structure, in which yarns are arranged in an elliptical shape, and a linear structure which is connected to the elliptical part. The elliptical structure and the linear structure are interwoven with each other. The elliptical structure and the linear structure include at least one material selected from gold, silver, an alloy of silver and copper, platinum, and palladium. The distance (D) on the front surface of the elliptical structure can be smaller than 2 Eo.

Description

Radio frequency domain electromagnetic wave shielding fabric {Fabric for shielding radio frequency domain electromagnetic wave}

The present invention relates to a radio frequency domain electromagnetic wave shielding fabric, and more particularly, to a radio frequency domain electromagnetic wave shielding fabric capable of shielding magnetic field waves by shielding electric field waves in the radio frequency domain.

Modern people are excessively exposed to artificial electromagnetic waves from electricity and wireless communication technology. Electromagnetic waves that are almost 10 billion times higher than in the 1960s are being observed in living environments. In particular, another explosion of artificial electromagnetic waves is expected in the new era we are facing, such as 5G communication networks, artificial intelligence, the Internet of Things, and the 4th Industrial Revolution.

Worldwide, about 25 million people are hypersensitive to electromagnetic waves from smartphones, repeater antennas, smart meters, and even household electricity, and more than 300 million suffer from moderate headaches or sleep disturbances. However, most people do not know about electromagnetic wave environmental diseases, and health authorities in many countries, including Korea, do not even classify them as diseases.

Every organ in the human body senses and operates with electrical signals from nerve cells. The brain, heart, blood, muscles, nerves, kidneys, digestive organs, etc. have their own electromagnetic wave frequencies, and each organ exchanges information with each other through this. If the human body is continuously exposed to artificial electromagnetic waves in a high living environment, it will suffer serious health damage. In addition, the harmful mechanism of electromagnetic waves to the human body is very diverse, such as damaging the genes of cells, causing abnormalities in the flow of neurotransmitters, and introducing toxic substances by tearing down the protective barrier of the body. In addition, electromagnetic waves interfere with the human body's self-recovery from these harmful phenomena experienced by the human body. As a result, many people suffer from various diseases such as insomnia, tinnitus, infertility, autism, breast cancer, and brain tumors.

An object of the present invention is to provide a radio frequency domain electromagnetic wave shielding fabric capable of shielding magnetic field waves by shielding electric field waves in the radio frequency domain.

A fabric for shielding electromagnetic waves in the radio frequency region according to an embodiment of the present invention is a fabric for shielding electromagnetic waves in the radio frequency region to block magnetic field waves by shielding electric field waves in the radio frequency region, and includes an oval structure in which yarns are arranged in an elliptical shape and It includes a linear structure connected to the elliptical portion, the elliptical structure and the linear structure have a structure in which the elliptical structure and the linear structure are woven with each other, and the elliptical structure and the linear structure are at least one of gold, silver, an alloy of silver and copper, platinum, and palladium It includes one material, and the distance D on the front face of the elliptical structure may be smaller than 2 Eo.

According to the present invention, electromagnetic waves in the radio frequency domain can be shielded by shielding electric field waves in the radio frequency domain so that magnetic field waves can also be blocked.

1 is a diagram schematically showing electromagnetic waves according to wavelengths and frequencies belonging to the electromagnetic wave spectrum.
2 is a diagram illustrating the magnitude of an electromagnetic wave with respect to a spatial variable z.
3 is a diagram illustrating the magnitude of an electromagnetic wave with respect to a time variable t.
4 is a diagram schematically showing an electromagnetic wave shielding structure of an electromagnetic wave shielding fabric according to an embodiment of the present invention.
5 is a diagram showing intervals of shielding electrodes for shielding an electric field.
6 is a diagram showing the thickness of an autism electrode for shielding an electric field.
7 is a view showing the structure of an electromagnetic wave shielding fabric according to an embodiment of the present invention.
8 is a configuration diagram schematically showing the configuration of an electromagnetic vehicle shielding test of an electromagnetic wave shielding fabric according to an embodiment of the present invention.
9 is a table showing the results of an electromagnetic vehicle shielding test of an electromagnetic wave shielding fabric according to an embodiment of the present invention.
10 and 11 are results of experiments on electromagnetic wave exposure status for real surrounding living environments.

Hereinafter, specific details for carrying out the present invention will be described in detail with reference to the accompanying drawings based on preferred embodiments of the present invention. At this time, as disclosed in the drawing of one embodiment, the same reference numerals are assigned to the same components as those disclosed in the drawings of another embodiment, and the description in the other embodiment may be equally applied. can be omitted. In addition, known functions or configurations related to the present invention refer to known technologies, and detailed description thereof is simplified or omitted here.

In addition, the terms used in this specification are general terms that are currently widely used as much as possible while considering the functions in the present invention, but this may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technologies, etc. can In addition, in a specific case, there are also terms arbitrarily selected by the inventor, and in this case, the meaning will be described in detail in the description of the invention. Therefore, the term used in this specification should be defined based on the meaning of the term and the overall content of the present invention, not simply the name of the term.

In this specification, when a certain part 'includes' a certain component, it means that it may further include other components, not excluding other components unless otherwise stated. In addition, the term 'unit' used in this specification means a software configuration as well as a hardware configuration such as an FPGA or an ASIC. However, 'part' is not limited to software or hardware. A 'unit' may be configured to reside in an addressable storage medium and may be configured to reproduce one or more processors. Thus, as an example, 'part' includes components such as software components, object-oriented software components, class components and task components, processes, functions, properties, procedures, subroutines. fields, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays and variables. The functionality provided within the components and 'parts' may be combined into a smaller number of elements and 'parts' or further separated into additional elements and 'parts'.

1 is a diagram schematically showing electromagnetic waves according to wavelengths and frequencies belonging to the electromagnetic wave spectrum. Referring to the drawing, the target of the electromagnetic spectrum to be shielded by the fabric structure for clothing is radio waves in the microwave (hundreds of MHz to several GHz) band.

는 전기장 벡터,

는 자기장 벡터,

는 투자율,

는 전도율,

은 유전율이다.Electromagnetic waves are composed of electric field waves and magnetic field waves, and temporal changes in electric field waves form magnetic field waves, and temporal changes in magnetic field waves form electric fields. Modeling of these electromagnetic waves can be expressed by Maxwell's equations and is shown in Equations 1 and 2 below. here

is the electric field vector,

is the magnetic field vector,

is the permeability,

is the conductivity,

is the permittivity.

와 자기장

에 관한 헬름홀츠 파동방정식을 유도하여 풀면, 공간과 시간의 함수로 된 전기장파와 자기장파를 구할 수 있다. 예를 들어, xyz공간에서 시간에 따라 z축으로 진행하는 전기장파와 자기장파는 수학식 3 및 4와 같은 형태가 된다. 여기서

는 파의 감쇠율,

는 파의 각주파수,

는 위상상수,

는 고유임피던스이다. The electric field from these modeling

and magnetic field

By deriving and solving the Helmholtz wave equation for , the electric and magnetic field waves as functions of space and time can be obtained. For example, electric field waves and magnetic field waves traveling along the z-axis with time in the xyz space have the same forms as Equations 3 and 4. here

is the decay rate of the wave,

is the angular frequency of the wave,

is the phase constant,

is the intrinsic impedance.

Since electromagnetic waves change as a function of time and space, it is possible to draw them as a function of time with the spatial variable fixed, and vice versa. If time t is set as a constant in the electric field waveform moving in the z-axis with time, and the waveform is drawn according to the spatial variable z, it is as shown in FIG. 2.

마다 반복된다. 이를 파장이라 한다. 파장과 주파수의 관계는

이다. 여기서 c는 빛의 속도이다. 예로서 300[MHz]∼3[GHz]의 파장은 1[m]∼10[cm]이다. 또한 공간변수 z를 상수로 놓고 시간 t에 따라 파형을 그리면 도 3과 같다. 여기서 파는 시간 T마다 반복된다. 이를 주기라 한다. 주파수와 주기의 관계는

이다.street sold here

repeated every time This is called a wave. The relationship between wavelength and frequency is

to be. where c is the speed of light. As an example, the wavelength of 300 [MHz] to 3 [GHz] is 1 [m] to 10 [cm]. In addition, if a spatial variable z is set as a constant and a waveform is drawn according to time t, it is shown in FIG. 3. Here, the digging is repeated every time T. This is called giving The relationship between frequency and period is

to be.

]∼0.33[

]이다. 한편, 전자파는 공간내의 여러 매질(자유공간, 유전체, 도체)을 통하여 전파되는데, 도체를 통하여 전파될 때는 그 진폭은

만큼 감쇠한다. 특히,

를 전자파가 전도체 매질내에서 37% 감쇠되는 침투깊이가 되며, 구리매질에서 매질 내부로 침투할 수 있는 깊이가 된다. As an example, the period of 300 [MHz] to 3 [GHz] is 0.33 [

]∼0.33[

]to be. On the other hand, electromagnetic waves propagate through various media (free space, dielectric, conductor) in space. When propagating through a conductor, its amplitude is

attenuate as much as Especially,

becomes the penetration depth at which electromagnetic waves are attenuated by 37% in the conductor medium, and becomes the depth at which the copper medium can penetrate into the medium.

[

] 보다 더 실용적인 시평균 포인팅벡터

[

]는 수학식 6과 같이 구할 수 있다.Energy in space can be transferred from one point to another by means of electromagnetic waves. The energy transfer ratio can be explained by Poynting's theorem, and the instantaneous power density at one point can be expressed as a Poynting vector as shown in Equation 5. Instantaneous pointing vector

[

] more practical time-averaged Poynting vectors

[

] can be obtained as in Equation 6.

The purpose of shielding is to confine radiant energy to a specific area or to prevent radiant energy from penetrating a specific area. The shielding may be in the form of a partition or box, or may be a shield of a cable or connector. A material with good conductivity is used for the shielding material. In the present invention, since it should be used for clothing, a fabric with excellent air permeability of a lattice structure is devised by using a material that has excellent conductivity and is non-corrosive.

Also, as mentioned above, the temporal change of the electric field wave induces the magnetic field wave, and the temporal change of the magnetic field wave induces the electric field wave. Therefore, in order to shield electromagnetic waves, both electric and magnetic field waves may be shielded, but in the present invention, a method in which the magnetic field waves are naturally shielded by shielding the electric field waves is selected. An electromagnetic wave shielding structure for fabric for clothing to realize this may be devised as shown in FIG. 4 . 4 shows an electromagnetic wave shielding structure of an electromagnetic wave shielding fabric according to an embodiment of the present invention. Here, the left side is a front view of the electromagnetic wave shielding fabric, and the right side is a side view of the electromagnetic wave shielding fabric.

와 두께

은 수학식 7과 같이 결정될 수 있다. 차폐원단을 통과한 전력밀도를

[

라 할 때 전력밀도는 수학식 7로부터 결정될 수 있다. Here, the elliptical or straight structure is woven from a material with good conductivity, such as gold, silver, an alloy of silver and copper, platinum, or palladium. The spacing of the elliptical or straight structure

and thickness

can be determined as in Equation 7. The power density passing through the shielding fabric

[

When it is said, the power density can be determined from Equation 7.

보다 작게 한다. 예를 들어

와 같은 간단한 경우의 전기장 파의 차폐를 고려하자. 도 5로부터 진행방향(z축)으로 전달되는 전기장파가 통과할 수 있는 최대 간격은 2

[m]가 된다. From this value the spacing of the weave is

make it smaller for example

Consider the shielding of electric field waves in the simple case of 5, the maximum distance that electric field waves transmitted in the traveling direction (z-axis) can pass is 2

becomes [m].

동안 c의 속도로 진행한 거리는

[m]이며, 이 두께로 차폐전극을 구성하게 되면, 어떤 조건에서 들어온 전기장도 위 또는 아래 전극에 흡수되게 된다. 특히, 이 두께는 원단을 겹쳐서 구현할 수 있다. In addition, from FIG. 6, the electric field wave

distance traveled at speed c during

[m], and when the shielding electrode is constructed with this thickness, the electric field entered under any condition is absorbed by the upper or lower electrode. In particular, this thickness can be realized by overlapping the fabric.

에 의하여 같이 결정된다. 여기서

는 입사전기장,

는 투과전기장이다. 7 discloses a structure of an electromagnetic wave shielding fabric according to an embodiment of the present invention. 8 is a configuration diagram schematically illustrating the configuration of an electromagnetic vehicle shielding test of an electromagnetic wave shielding fabric according to an embodiment of the present invention. 9 shows a table showing the results of an electromagnetic vehicle shielding test of an electromagnetic wave shielding fabric according to an embodiment of the present invention. At this time, the test method follows IEEE-STD-299-1997 of Korea Electromagnetic Wave Research Institute. At this time, the shielding efficiency is

is determined as well by here

is the incident electric field,

is the transmission electric field.

On the other hand, FIGS. 10 and 11 are results of experiments on electromagnetic wave exposure status for actual surrounding living environments. Referring to the drawing, as a result of absorbing electromagnetic waves generated around the Internet sharing device with this product, it is converted into heat and burned. That is, it affects cells. In addition, it can be seen that the electromagnetic wave environment around the base station far exceeds the standard.

According to the present invention, electromagnetic waves in the radio frequency domain can be shielded by shielding electric field waves in the radio frequency domain so that magnetic field waves can also be blocked.

So far, the technical idea of the present invention has been developed through the disclosure of preferred embodiments of the present invention that ensure the specificity of the idea. Those skilled in the art to which the present invention pertains will be able to understand that the preferred embodiment may be implemented in a modified form within a range that does not deviate from the technical spirit (essential characteristics) of the present invention. Therefore, the disclosed embodiments should be considered from an explanatory point of view rather than a limiting point of view, and the scope of the present invention should be interpreted as including not only the matters disclosed in the claims, but also all differences within the scope equivalent thereto.

Claims (1)

As a fabric for shielding electromagnetic waves in the radio frequency domain that can block magnetic field waves by shielding electric field waves in the radio frequency domain,
An elliptical structure in which yarns are arranged in an elliptical shape and
Including a straight structure connected to the elliptical portion,
The elliptical structure and the linear structure have a structure in which the structure is woven with each other,
The elliptical structure and the linear structure include at least one material of gold, silver, an alloy of silver and copper, platinum, and palladium,
Fabric for shielding electromagnetic waves in the radio frequency region, characterized in that the interval (D) on the front of the elliptical structure is smaller than 2 Eo.

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