KR20250122342A - Floor shielding apparatus and shielding structure using the same - Google Patents

Abstract

A floor shielding device and a shielding structure using the same are disclosed. The floor shielding device includes an inner block including an electromagnetic wave loss material, and an outer block fixedly connected to the inner block and formed of a metallic material, wherein the inner block and the outer block form a panel block having a double structure or a laminated structure, and the panel block is installed to block electromagnetic waves on at least one side of a space between a lower surface of the shielding structure and a floor on which the shielding structure is installed.

Description

Floor shielding apparatus and shielding structure using the same {FLOOR SHIELDING APPARATUS AND SHIELDING STRUCTURE USING THE SAME}

The present invention relates to electromagnetic wave shielding technology, and more particularly, to a floor shielding device that can improve the shielding effect by blocking electromagnetic waves transmitted through openings present in the floor surface of a shielding structure installed to protect major equipment and systems from electromagnetic wave threats including high-power electromagnetic waves, and a shielding structure using the same.

Electromagnetic shielding is one of the representative countermeasure technologies used to protect key components, equipment, and systems from various electromagnetic threats, such as nuclear electromagnetic pulse (EMP) and non-nuclear EMP.

Typically, electromagnetic shielding uses metallic materials to block the transmission of radioactive electromagnetic waves propagating through the air. To maintain a certain level of shielding effectiveness, the various types of openings that may exist in the shielding structure must be carefully managed.

However, in various types of electromagnetic shielding equipment, there are openings that are essential for the performance implementation and maintenance of the equipment, as well as openings that are unintentionally created during the manufacturing or operation process, and these openings affect the shielding effect.

Accordingly, extensive research is being conducted on the shielding effectiveness of shielding structures, such as metallic enclosures with various openings. For example, large-scale shielding facilities, installed to protect key equipment and systems from high-power electromagnetic wave threats, are often elevated above the floor for testing, evaluation, and maintenance. Furthermore, small-scale shielding facilities, such as shielding racks, are often manufactured or installed with a certain distance between the floor and the ground or building floor for ease of use.

In these shielding structures, electromagnetic waves can penetrate through intentional or unintentional openings in the floor of the shielding structure, ultimately reducing the shielding performance of the shielding facility. Therefore, appropriate measures are needed to enhance the shielding effectiveness of the floor of the current shielding structure.

Moreover, if shielding structures or facilities are constructed and maintained as designed, their electromagnetic shielding performance will be maintained at a specified level, and key electrical and electronic equipment within the shielding structure will not be affected by external electromagnetic waves. However, various types of unintentional openings can occur during the construction or use of shielding facilities, and these openings can reduce the shielding performance of the facility. In particular, when unintentional openings occur in the bottom of a shielding structure, it is very difficult to identify the location and shape of the opening. Therefore, there is a need for technological development to prevent the deterioration of shielding performance caused by unintentional openings in facilities or enclosures that require a certain level of shielding performance.

The present invention has been derived to meet the needs of the prior art as described above, and the purpose of the present invention is to provide a technology for improving the shielding performance of a shielding facility or container made of a metallic material, which can improve the shielding effect of an electromagnetic shielding facility or container by efficiently blocking electromagnetic waves transmitted through an opening present in the bottom surface of a shielding structure installed to protect major equipment and systems from electromagnetic wave threats including high-power electromagnetic waves, and a shielding structure using the same.

Another object of the present invention is to provide a floor shielding device and a shielding structure using the same, which can improve reliability as an electromagnetic compatibility measure or a high-power electromagnetic wave protection means by maintaining an electromagnetic wave shielding effect of a certain level or higher even when there is an unintentional opening in the bottom surface of the shielding structure.

Another object of the present invention is to provide a floor shielding device and a shielding structure using the same, which can effectively shield electromagnetic waves through the bottom surface of a shielding structure by using various technologies such as a waveguide below cutoff (WBC), a gasket, and bonding, in order to meet the high shielding performance standards required in electromagnetic shielding structures or facilities for high power electromagnetics (HPEM) protection and electromagnetic compatibility (EMC) measures.

According to one aspect of the present invention for solving the above technical problem, a floor shielding device is a floor shielding device that blocks electromagnetic waves transmitted through an opening in a lower surface or a floor surface of a shielding structure, the floor shielding device comprising: an inner block including an electromagnetic wave loss material; and an outer block fixedly connected to the inner block and formed of a metallic material, wherein the inner block and the outer block form a panel block having a double structure or a laminated structure, and at least one side of a space between the lower surface of the shielding structure and a floor on which the shielding structure is installed is blocked by the panel block.

According to another aspect of the present invention for solving the above technical problem, a floor shielding device is a floor shielding device that blocks electromagnetic waves transmitted through an opening in the bottom surface of a shielding structure, the floor shielding device comprising: an inner block; an outer block fixedly connected to the inner block; and at least one connecting member installed between one or more pairs of adjacent panel blocks among panel blocks of a double structure each composed of the inner block and the outer block to support the panel blocks.

The inner block may be made of an electromagnetically lossy material, and the outer block may be made of a metallic material.

The opening area per unit area of the first mesh foil attached to the inner block may be larger than the opening area per unit area of the second mesh foil attached to the outer block.

At least a portion of the above guide frame may be made of a flexible material.

Two adjacent panel blocks joined by the guide frame made of the above flexible material may be bent at a predetermined angle at their joint or may have an arc shape with a predetermined curvature.

The bottom shielding device of the above shielding structure may further include one of an absorbent sheet and a magnetic sheet attached to one surface of the inner block or one surface of the outer block.

The bottom shielding device of the above shielding structure may further include at least one of a waveguide, a finger strip, a conductive gasket, a conductive tape, and copper wool below a cutoff frequency, which is arranged between the guide frame and adjacent panel blocks joined by the guide frame.

The bottom shielding device of the above shielding structure may further include a wing portion extending a certain length in a direction perpendicular to one side from one edge of at least one of the inner block and the outer block and contacting one side of the lower panel of the shielding structure. By the wing portion, at least some of the panel blocks may be installed to be bent in a direction perpendicular to the lower panel to face the lower panel or in a direction facing the lower panel at an angle.

The bottom shielding device of the above shielding structure may further include a connector assembly installed in an opening of one or more of the panel blocks and connecting the inside and the outside of the opening with an electromagnetic shielding structure.

The connector assembly has a back shell that receives a cable at one end and fits into the connector body at the other end, wherein the back shell may have an opening that receives a potting compound within the shell.

The connector assembly may include a ferrule member surrounding the cable between a first cover of the connector body and a second cover placed on the first cover; a ferrule clamping member compressing the second cover to the ferrule member; a means for fixing the ferrule clamping member to the back shell; and a potting compound filling the interior of the back shell and fixing the tail of the first cover and the wire jacket therein.

The above backshell and the ferrule clamping member can close the opening and form an EMI (electromagnetic interference) shield on the cable and the connector body.

The above-described floor shielding device may further include a fastening member that is installed to protrude from at least one of the panel blocks and detachably connects to at least one of the bottom surface recessed portion, the bottom surface support portion, and the lower wheel structure of the above-described shielding structure.

According to another aspect of the present invention for solving the above technical problem, a shielding structure having a floor shielding device comprises: a lower panel having a floor and having an opening, the lower panel being located at a predetermined height from a floor on which the shielding structure is located or installed; an upper panel arranged at a predetermined distance from the lower panel; side panels supporting the upper panel on one surface of the lower panel; and a floor shielding device arranged between the other surface of the lower panel and the floor. Here, the floor shielding device comprises an inner block including an electromagnetic wave loss material; and an outer block fixedly connected to the inner block and formed of a metallic material. The inner block and the outer block form a panel block having a double structure or a laminated structure.

The above side panels have a double structure and can be joined to each other using a connecting member.

According to the present invention, the shielding performance of shielding facilities or shielding devices made of metallic materials can be improved to effectively respond to electromagnetic threats, including high-power electromagnetic waves such as nuclear electromagnetic pulses (EMPs) or non-nuclear EMPs. In particular, the shielding performance of electromagnetic shielding facilities or electromagnetic shielding enclosures having a bottom surface with unintentional openings can be maintained or improved.

In addition, according to the present invention, by additionally applying an electromagnetic shielding device to a shielding structure such as a shielding facility or a shielding rack having a bottom surface with an opening, the electromagnetic shielding performance of the shielding structure can be improved by reducing the electromagnetic threat caused by an opening intentionally or unintentionally created in the bottom surface.

Furthermore, the configuration proposed in the present invention maintains or improves a certain level of electromagnetic shielding effectiveness in structures with openings in their floor surfaces, thereby enhancing reliability as an electromagnetic compatibility measure or high-power electromagnetic wave protection device. Furthermore, it offers the advantage of protecting key devices and systems within electromagnetic shielding facilities and enclosures while ensuring stable operation.

The accompanying drawings, which are incorporated in and constitute a part of the detailed description to aid in understanding the present invention, provide embodiments of the present invention and, together with the detailed description, illustrate the technical idea of the present invention.
Figure 1 is an exemplary diagram illustrating an electromagnetic shielding mechanism of a metallic body having an opening.
Figure 2 is a graph illustrating the shielding effect for a rectangular solid body having an opening in the bottom surface.
Figure 3 is a partial cutaway perspective view illustrating a shielding facility installed above a certain height from the floor.
Figure 4 is an example of a small or medium-sized shielding structure installed above a certain height from the floor.
Figure 5 is an example of a shielding structure installed at a certain height from a floor surface made of concrete, etc.
FIG. 6 is an exemplary diagram of a shielding structure to which a floor shielding device according to one embodiment of the present invention is applied.
Figure 7 is a perspective view of a part of the bottom shielding device of Figure 6.
Figure 8 is an exemplary diagram of a shielding structure to which a floor shielding device according to another embodiment of the present invention is applied.
FIG. 9 is a schematic partially exploded perspective view illustrating the configuration of a floor shielding device according to another embodiment of the present invention.
Fig. 10 is a schematic partial enlarged perspective view illustrating a block structure that can be employed in the floor shielding device of Fig. 9.
FIG. 11 is a partially enlarged perspective view illustrating an opening shielding structure that can be employed in a bottom surface opening of a bottom shielding device according to another embodiment of the present invention.
FIG. 12 is a partially enlarged cross-sectional view illustrating another opening shielding structure that can be employed in the bottom surface opening of a bottom shielding device according to another embodiment of the present invention.
FIG. 13 is a front view of a unit panel block that can be employed in a floor shielding device according to another embodiment of the present invention.
Fig. 14 is a perspective view illustrating a connecting member that is joined to the unit panel block of Fig. 13.
FIG. 15 is a partial cross-sectional view illustrating a panel block and its installation structure that can be employed in a floor shielding device according to another embodiment of the present invention.
FIG. 16 is a partial cross-sectional view illustrating a panel block and its installation structure that can be employed in a floor shielding device according to another embodiment of the present invention.
FIG. 17 is a front view illustrating a unit panel block that can be employed in a floor shielding device according to another embodiment of the present invention.
Fig. 18 is a perspective view illustrating a connecting member that is joined to the unit panel block of Fig. 17.
FIG. 19 is a schematic perspective view illustrating a floor shielding device according to another embodiment of the present invention.
FIG. 20 is a schematic plan view illustrating a floor shielding device according to another embodiment of the present invention.

The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and/or" includes any combination of multiple related items described herein or any one of multiple related items described herein.

In the embodiments of the present application, 'at least one of A and B' may mean 'at least one of A or B' or 'at least one of combinations of one or more of A and B'. Furthermore, in the embodiments of the present application, 'at least one of A and B' may mean 'at least one of A or B' or 'at least one of combinations of one or more of A and B'.

When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components in between.

The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in more detail. In order to facilitate an overall understanding in describing the present invention, identical reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted.

Before explaining the present invention in detail, the background of the present invention is as follows.

With the rapid shift toward a digital-based society, fueled by electrical and electronic technologies, artificial intelligence (AI), and big data, most critical facilities, including key national infrastructure such as power, communications, and finance, are now controlled and operated digitally. This trend will continue and accelerate. Furthermore, most countries, including Korea, are maintained by a tightly interconnected system of systems (SOS) that handles various functions. Most critical infrastructure is closely interconnected and operated, and this interconnectivity is expected to continue to expand and strengthen in the future. In this situation of close interconnectivity between key facilities, including critical infrastructure, a failure or malfunction in a specific area can have a serious impact not only on that specific area but also on other interconnected areas, potentially resulting in economic losses, significant inconvenience, or even serious loss of life.

Meanwhile, one threat with a high potential to severely impact critical digital infrastructure is high-power electromagnetic waves (HPEM). HPEM are electromagnetic waves with high energy, including the high-altitude nuclear electromagnetic pulse (HEMP) caused by nuclear explosions and non-nuclear electromagnetic pulses, including intentional electromagnetic interference (IEMI). Here, IEMI can refer to the intentional and malicious generation of electromagnetic energy to inject noise or signals into electrical and electronic systems for the purpose of terrorism or criminal activity, thereby disrupting, disrupting, or damaging them.

A representative example of a protective technology used to protect major devices or systems from intentional or unintentional electromagnetic waves, such as electromagnetic interference such as noise generated from electrical and electronic devices and high-power electromagnetic waves generated with specific intent, is a shielding structure made of conductive material.

Typically, metallic shielding structures are used to mechanically protect internal equipment and systems from external threats, such as unwanted electromagnetic waves (e.g., noise) or unintended electromagnetic fields, such as high-power electromagnetic pulses. These electromagnetic shielding enclosures or shielding structures should be designed to have as few gaps (seams, apertures, etc.) as possible to completely block electromagnetic waves. However, in addition to the artificial openings necessary to maintain the functionality of the equipment or facility, various unintentional openings may exist. These openings degrade the shielding performance of the structure, and therefore, the impact of these openings is crucial in the design of shielding structures.

Figure 1 is an exemplary diagram illustrating an electromagnetic shielding mechanism of a metallic body having an opening.

In general, the electromagnetic shielding effect of a metallic body is determined by the absorption effect (A), reflection effect (R), multiple reflection effect (B) of the shielding material itself, leakage effect through various types of openings, and standing wave effect caused by resonance of the metallic body, as illustrated in Fig. 1.

This electromagnetic shielding effect is expressed as mathematical formula 1.

In mathematical expression 1, the shielding due to reflection effect (R), absorption effect (A), and multiple reflection effect (B) for electromagnetic waves is an effect caused by the material of the shielding material, and the leakage effect due to leakage and resonance is an effect caused by the physical structure of the shielding body. Here, the reflection effect (R), absorption effect (A), and multiple reflection effect (B) can be collectively referred to as material effects, the leakage effect can be collectively referred to as the aperture effect, and the standing wave effect can be collectively referred to as the body resonance effect. These leakage effect and standing wave effect can be collectively referred to as structural effects.

Typically, materials used in shielding structures can be metallic, for example, with a thickness of 5mm or more, to protect the equipment and systems located within from electromagnetic threats while also providing structural protection. In such cases, the shielding effect achieved by the material can exceed 100dB. Therefore, the shielding effect of such shielding structures can focus on managing intentional or unintentional openings. Therefore, even when openings inevitably occur in shielding structures, a method is needed to maintain or manage the shielding performance of electromagnetic shielding structures at a certain level.

Typically, shielding facilities or structures made of metallic materials produce a shielding effect of approximately 100 to 120 dB or more when completely sealed electromagnetically. However, if there are openings, the shielding effect is significantly reduced. The shielding effect of a shielding case with openings is shown in Figure 2.

Figure 2 is a graph illustrating the shielding effect for a rectangular solid body having an opening.

As can be seen in Figure 2, the shielding effectiveness of electromagnetic wave protection facilities or shielding structures with openings is almost completely eliminated at the resonance frequency. That is, resonance occurs very densely in the overmode frequency range, and the shielding effectiveness of the shielding structure is significantly reduced at each resonance frequency.

As illustrated in the examples referenced in Figures 1 and 2 above, shielding structures must be verified to ensure adequate shielding performance. Shielding performance can be verified through measurement results based on methods presented in standards such as MIL Std 188 125-1/2, IEEE Std. 299, and IEEE Std. 299.1, as well as technical standards such as the Notice on High-Power and Leakage Electromagnetic Wave Safety Evaluation Standards and Methods.

Furthermore, if shielding performance falls below the required standard, shielding effectiveness can be improved and maintained by removing unintentional openings or using additional electromagnetic interference mitigation measures, such as gaskets. However, due to the nature of shielding structures, it can be difficult to verify shielding performance. In such cases, a certain level of shielding performance must be secured and maintained even when unintentional holes, seams, or apertures are present in the area.

Figure 3 is a partial cutaway perspective view illustrating a shielding facility installed above a certain height from the floor.

The source of the shielded cabins in Fig. 3 is the following specific internet site: "https://emshield.de/en/portfolio/radiation-protection-tempest/".

As shown in Figure 3, most large-scale shielding facilities installed to protect key equipment and systems from electromagnetic threats are installed at a certain height above the floor where they are installed for testing, evaluation, and maintenance purposes. In these cases, electromagnetic waves can penetrate through intentional or unintentional openings in the floor, reducing the shielding properties of the shielding facility.

Figure 4 is an example of a small or medium-sized shielding structure installed above a certain height from the floor.

As shown in Figure 4, even in the case of shielding racks designed to protect equipment from high-power electromagnetic wave threats at the small- to medium-sized equipment level, the lower surface of the shielding structure is often raised above a certain height from the floor where it is installed to facilitate movement or maintenance. Even in these cases, unintentional openings in the lower surface of the shielding rack can significantly reduce the shielding performance of the shielding structure.

As described above with reference to FIGS. 3 and 4, when a shielding structure including a shielding facility and a shielding rack is installed at a certain height from the floor, it is difficult to measure or confirm the shielding performance at the lower surface of the shielding structure, and it is also not easy to apply measures to improve the shielding performance.

To ensure the shielding effect of electromagnetic shielding facilities or structures, they must be manufactured perfectly, with no openings on any surface, including the floor. However, if openings exist in the floor due to manufacturing limitations or issues, or if they exist unintentionally due to the characteristics of the shielding facility or device, measures must be taken to prevent electromagnetic wave penetration through the floor openings of the shielding structure to ensure the shielding effect, thereby protecting the equipment within the shielding structure.

Moreover, as described above, when an electromagnetic wave applied from the outside is incident on a metallic shielding facility or device, a current is generated on the metallic surface of the shielding facility or device, and the surface current thus generated is transmitted to the inside through an intentional or unintentional opening of the body, thereby affecting the shielding effectiveness. In addition, in the case of a metallic electromagnetic shielding facility or device as shown in Equation 1, when an electromagnetic wave is introduced inside, a resonance occurs inside at a specific frequency depending on the size of the shielding facility or device, and at the frequency where this resonance occurs, the intensity of the electric field increases, and as a result, the electromagnetic shielding effect deteriorates, which increases the possibility of affecting the equipment.

In particular, in the case of a shielding structure constructed above a certain height from the floor of the installation space, as described with reference to FIGS. 3 and 4, electromagnetic waves may enter the interior of the enclosure through openings that may exist on the floor, thereby affecting the shielding effect. Furthermore, if the height from the bottom or lower surface of the shielding structure to the floor of the installation space is not high, i.e., if the height required for measurement or maintenance is not secured, it is difficult to confirm with the naked eye or through testing and evaluation due to the structural characteristics.

Therefore, in the case of shielding structures that have a shielding floor surface that is raised to a certain height rather than installed by attaching the shielding structure to the floor, additional protective measures are required.

The present invention provides a method for shielding the bottom surface of a shielding structure by placing a bottom shielding device made of an electromagnetic wave reducing material, such as a metallic material or an electromagnetic wave lossy material, at the lower portion of the shielding structure so that a certain level of shielding performance can be maintained even when an opening exists in the bottom surface of the shielding structure made by raising the bottom surface of the installation space by a certain height.

Fig. 5 is an exemplary diagram of a shielding structure installed at a certain height from a floor surface composed of concrete or the like. Fig. 6 is an exemplary diagram of a shielding structure to which a floor shielding device according to one embodiment of the present invention is applied. Fig. 7 is a perspective view of a portion of the floor shielding device of Fig. 6. And Fig. 8 is an exemplary diagram of a shielding structure to which a floor shielding device according to another embodiment of the present invention is applied.

As shown in Fig. 5, in order to test and evaluate the use or operation of the shielding structure (100) and its shielding performance, the shielding structure (100) is installed at a certain height from the floor (300) on which it is installed. The shielding structure (100) may include a small or medium-sized shielding device such as a shielding rack or a fixed shielding facility.

In order to install the shielding structure (100) by raising it to a certain height from the floor (300), a support structure (200) may be provided at the lower end of the shielding structure (100). The support structure (200) may include a plurality of rod-shaped frames, a support frame manufactured to form a certain height or thickness, frames equipped with wheels, or a means or structure that performs the same or similar function as these.

In order to prevent the shielding effect from being reduced by an opening intentionally or unintentionally formed on the bottom surface of the aforementioned shielding structure (100), as shown in FIG. 6, a bottom shielding structure or a bottom shielding device (500) may be additionally installed on the bottom of the shielding structure (100).

The floor shielding device (500) may be composed of a combination of electromagnetic wave reduction materials, such as metallic materials or electromagnetic wave lossy materials. Constructing a floor shielding structure solely from metallic materials may ultimately generate internal resonance, resulting in no improvement in shielding effectiveness or even a reduction in shielding performance at certain frequencies. Therefore, in order to reduce externally incident electromagnetic waves while simultaneously reducing the resonance effect caused by internally incoming electromagnetic waves, thereby ultimately enhancing the shielding effectiveness, a material with high electromagnetic wave loss characteristics, such as an electromagnetic wave absorber, must be used, or a metallic material and an electromagnetic wave lossy material must be used simultaneously.

To explain more specifically, when using a metallic material and an electromagnetic wave loss material at the same time, in order to block electromagnetic waves coming from the outside and reduce resonance characteristics caused by electromagnetic waves entering the inside, as shown in FIG. 7, in the floor shielding device (500), an inner block (510) made of an electromagnetic wave loss material may be placed on the inside side based on the space where the floor shielding device (500) is installed, and an outer block (520) made of a metallic material may be placed on the outside of the space where the floor shielding device (500) is installed.

In addition, in order to increase the shielding effect of the floor shielding device (500), the formation of openings in the metallic material can be minimized, and the loss characteristics of the electromagnetic wave loss material can be increased or its thickness can be increased.

In addition, even when a metallic material is used for the external block (520) of the floor shielding device (500), unlike the shielding body, the opening does not have to be completely eliminated, and in order to utilize the space at the bottom of the shielding structure (500), it can be configured to be opened and closed using a hinge or the like, as shown in Fig. 8. In addition, when a metallic material is used, a metallic material in the form of a mesh can be applied for the sake of structure or convenience of use.

In addition, since the direction from which threatening electromagnetic waves, such as high-power electromagnetic waves, enter the shielding structure (100) is not determined, the floor shielding device (500) can be basically placed on all four sides or the entire surface of the lower space of the shielding structure (100). However, when the structural characteristics of the facility to be protected are taken into consideration, the floor shielding device (500) can be applied only to directions with a high possibility of electromagnetic wave threats. In particular, when shielding at least a portion of the lower space of the shielding structure (100), the floor shielding device (500) can further include a guide frame installed between a plurality of panel blocks and a pair of adjacent panel blocks to support them.

Additionally, the floor shielding device (500) can be detachably coupled to at least one of the floor surface unevenness, floor surface support, and lower wheel structure of the shielding structure (100) through at least one fastening portion installed on one side thereof.

As an example of the implementation of the present invention, the floor shielding device (500) may be applied in places where maintenance or shielding performance evaluation is difficult after construction, such as when the floor of a large shielding facility or the floor of a shielding rack is spaced apart from the floor of the installation space by a predetermined distance. When an electromagnetic wave reduction material is additionally applied from the floor of the shielding facility to the floor of the installation space through the floor shielding device (500) proposed in the present invention, relatively reliable shielding performance can be provided for the shielding structure (100).

FIG. 9 is a schematic, partially exploded perspective view illustrating the configuration of a floor shielding device according to another embodiment of the present invention. FIG. 10 is a schematic, partially enlarged perspective view illustrating a block structure that can be employed in the floor shielding device of FIG. 9.

Referring to Fig. 9, in order to enhance the shielding effect of the shielding structure, the floor shielding device surrounding the space between the lower surface or lower panel of the shielding structure and the floor surface on which the shielding structure is installed may be configured to further include an intermediate block (530) between the inner block (510) and the outer block (520). The intermediate block (530) may be selectively employed in consideration of the manufacturing cost, thickness, shape, etc. of the floor shielding device.

In addition, the aforementioned intermediate block (530) can be selectively used to increase the shielding effect of the floor shielding device, depending on the shape or number of openings of the outer block (520) or the loss characteristics or thickness of the electromagnetic wave loss material of the inner block (510).

The floor shielding device is basically composed of a combination of an inner block (510) made of an electromagnetic wave reducing material such as an electromagnetic wave loss material and an outer block (520) made of a metallic material. By adopting this combination configuration, it is possible to solve the problem that, when the floor shielding structure is made of only a metallic material, resonance is generated inside the shielding space, and thus there is no improvement in the shielding effect or rather, the shielding performance is reduced at certain frequencies. In addition, in order to reduce the electromagnetic waves incident from the outside and increase the shielding effect by reducing the resonance effect caused by the electromagnetic waves entering inside, the floor shielding device may be composed of at least a double structure in which the inner block (510) includes a material with high electromagnetic wave loss characteristics such as an electromagnetic wave absorber on the inside of the metallic material, together with the outer block (520).

The intermediate block (530) that can be employed in such a floor shielding device may include at least one of a waveguide below cutoff (WBC), a finger strip for EMI shielding, a conductive gasket, conductive tapes, a conductive mesh, copper on cotton, and a composite material. The composite material may include a porous graphene structure, and the porous graphene structure may have a form having a graphene film and pores surrounded by the graphene film.

A waveguide (WBC) below the cutoff frequency, as illustrated in Fig. 10, may include a waveguide structure configured to block threatening radiated electromagnetic waves by utilizing the characteristic that electromagnetic waves do not propagate below the cutoff frequency, while allowing air, water, optical cables, etc. to pass through the shielding structure. Such a WBC may have a honeycomb panel shape. In a WBC having a honeycomb panel shape, the thickness (l) may be formed to be less than or equal to the inner diameter (t) of the unit internal honeycomb.

Meanwhile, the intermediate block (530) may be configured as a double structure including a first intermediate block attached to the inner block (510) and a second intermediate block attached to the outer block (520). For example, the first intermediate block may be a first mesh foil, and the second intermediate block may be a second mesh foil. In this case, the opening area per unit area of the first mesh foil may be configured to be larger than the opening area per unit area of the second mesh foil. According to this configuration, by making the opening sizes of each layer of the two-layer mesh foil forming the intermediate block (530) different, it is possible to form denser openings or openings with a smaller average diameter compared to a single-layer structure, and furthermore, through the effect of the size or number of openings decreasing from the outside to the inside in the cross section of the intermediate block (530), the resonance effect within the shielded space can be further reduced.

Meanwhile, the intermediate block (530) may be configured to include at least one of an absorbent sheet and a magnetic sheet attached to one surface of the inner block (510) or one surface of the outer block (520). At least one of the absorbent sheet and the magnetic sheet may be formed of the same material as the electromagnetic wave loss material constituting the inner block (510) or a different material. The absorbent sheet may be formed using at least one selected from among the Eccosorb LS series absorbers, which are polyurethane-based absorbers, as an EMI absorber that absorbs incident electromagnetic waves or electromagnetic noise. In addition, the magnetic sheet may be formed of an electromagnetic wave loss material or a magnetic material. At least one material selected from the group consisting of a permalloy foil, a silicon steel sheet, an amorphous strip, etc. may be used as the magnetic material.

FIG. 11 is a partially enlarged perspective view illustrating an opening shielding structure that can be employed in a bottom surface opening of a bottom shielding device according to another embodiment of the present invention.

Referring to Fig. 11, the opening shielding structure is a structure installed on the opening of the lower surface (110) of the shielding structure, and includes a pipe (710) and a fixing plate for fixing the pipe (710), and further, a separate conductive plate (730) is inserted into the inside of the pipe (710), thereby forming a shape in which the opening is divided into small-sized sub-openings by the pipe (710). The fixing plate may be formed in a flange shape at one end of the pipe (710). According to the configuration of this opening shielding structure, the air inside and outside the opening can be circulated, thereby blocking electromagnetic waves.

In particular, the conductive plate (730) may have a partition or partition plate shape that divides the internal space of the pipe (710) into sections of a cross-sectional size suitable for electromagnetic wave attenuation. For example, for electromagnetic wave attenuation or shielding, the length of the pipe (710) may be four to five times its diameter.

In addition, the conductive plate (730) may be configured such that the two plates are arranged orthogonally in the longitudinal direction so that the cross-section has a cross or cross-intersection shape. The configuration of the conductive plate (730) is not limited to a cross-sectional structure, and may include a radial cross-sectional structure, a honeycomb cross-sectional structure, a multiple circular hole structure, etc. that divide the internal space of the pipe (710) into two, three, or five or more in the longitudinal direction or the direction of fluid flow such as air.

In addition, the aforementioned fixed plate, in addition to its function of supporting the pipe (710), may be configured to electrically connect the conductive plate (730) placed in the internal space of the pipe (710) to the outside or ground. With this configuration, the opening shielding structure can satisfy the continuity of the shielding structure.

FIG. 12 is a partially enlarged cross-sectional view illustrating another opening shielding structure that can be employed in the bottom surface opening of a bottom shielding device according to another embodiment of the present invention.

Referring to FIG. 12, the opening shielding structure (800) may be configured to include, when there is a cable (900) having wires (910) passing through the opening, an external connector (810) having a diameter suitable for the opening size to be inserted into the opening, an internal connector (820) fitted inside the external connector (810), and a potting material (830) filled between the wires (910) and the cable cover in the internal space of the internal connector (820). In addition, the opening shielding structure (800) may further include a ring connector (920) threadably coupled to at least one of the external connector (810) and the internal connector (820). The ring connector (920) may expose the wires (910) extending through the opening shielding structure (800) to the outside.

The external connector (810) may be configured to carry a cable (900) at one end and receive an internal connector (820) at the other end. The external connector (810) may be referred to as a connector body. The internal connector (820) may be formed of a lightweight material such as aluminum and may have an EMI shielding function. The internal connector (820) may be referred to as a back shell.

The configuration of the above-described aperture shielding structure can be used in combination with a lower shielding device.

According to the above-described aperture shielding structure, the following connector assembly structure may be possible. The connector assembly corresponds to the aperture shielding structure. That is, the connector assembly has a back shell that receives a cable at one end and is fitted to a connector body at the other end, wherein the back shell may be configured to have an opening that receives a potting compound within the shell. In other words, the connector assembly may be configured to have a ferrule member that surrounds the cable between a first cover of the connector body and a second cover placed on the first cover, a ferrule clamping member that compresses the second cover to the ferrule member, a means for securing the ferrule clamping member to the back shell, and a potting compound that fills the interior of the back shell and secures the tail of the first cover and the wire jacket therein. At this time, the back shell and the ferrule clamping member may close the opening and form an EMI shield over the cable and the connector body.

Fig. 13 is a front view of a unit panel block that can be employed in a floor shielding device according to another embodiment of the present invention. Fig. 14 is a perspective view illustrating a connecting member that is coupled to the unit panel block of Fig. 13.

The unit panel block (550) of the present embodiment may include a nested structure of inner and outer blocks. Of course, the unit panel block (550) may be configured to further include an intermediate block depending on the implementation.

In addition, referring to FIG. 13, the unit panel block (550) may have a fastening portion (551, 552) having a smaller cross-sectional area in the vertical or horizontal direction than the middle portion. A first fastening portion (551) may be formed at one end of the unit panel block (550), and a second fastening portion (552) may be formed at the other end.

The unit panel blocks (550) of this structure can be fastened by a connecting member (560) as illustrated in Fig. 14. For example, the second fastening portion of the other end of the first unit panel block and the first fastening portion of one end of the second unit panel block can be inserted into a first groove (561) formed on one side of the connecting member (560) and a second groove (562) formed on the other side, respectively. When the first groove (561) and the second groove (562) penetrate the connecting member (560) and are connected to each other, the second fastening portion of the first unit panel block and the first fastening portion of the second unit panel block can be positioned in contact with or adjacent to each other inside the connecting member (560).

Fig. 15 is a partial cross-sectional view illustrating a panel block and its installation structure that can be employed in a floor shielding device according to another embodiment of the present invention. Fig. 16 is a partial cross-sectional view illustrating a panel block and its installation structure that can be employed in a floor shielding device according to another embodiment of the present invention.

Referring to FIG. 15, the unit panel block (550a) may be configured to further include an auxiliary panel (554) that is joined by a rotational fastening member (556) such as a hinge. The auxiliary panel (554) may be referred to as a wing member. The auxiliary panel (554) may be attached or fixed to the lower surface (110) of the shielding structure.

According to this configuration, the unit panel block (550a) can rotate within the rotational range of the fastening member (556). That is, the unit panel block (550a) can be installed so as to perform a rotational movement in which it comes into contact with the floor on which the shielding structure is installed at the lower surface (110) of the shielding structure and then is lifted into the air outside the shielding structure.

Meanwhile, in a case where the unit panel block (550a) cannot rotate outside the shielding structure due to the shape, structure, installation location, etc. of the shielding structure, the floor shielding device of the present embodiment can be configured to use a rotational fastening member (558) that functions to fold the unit panel block (550a) toward the lower side of the shielding structure by installing it between the unit panel block (550a) and the auxiliary panel (554), as shown in FIG. 16.

Fig. 17 is a front view illustrating a unit panel block that can be employed in a floor shielding device according to another embodiment of the present invention. Fig. 18 is a perspective view illustrating a connecting member that is coupled to the unit panel block of Fig. 17.

Referring to Fig. 17, each of the first unit panel block (570a) and the second unit panel block (570b) may have a recessed portion (571 or 572) for fastening at both ends thereof. The recessed portions (571, 572) may be formed to have a concave strip shape on one surface of both ends of each unit panel block (570a, 570b).

According to the above-described configuration, when the first unit panel block (570a) and the second unit panel block (570b) are arranged to form a right angle or a predetermined angle, they can be integrally connected by a connecting member installed between them.

The connecting member (580) may have a shape as illustrated in FIG. 18, and may be installed on the outer edge portions of the first unit panel block (570a) and the second unit panel block (570b) that are arranged at a right angle. The connecting member (580) may have two convex strip-shaped fastening portions (581, 582) on both sides that are respectively fitted into two adjacent protruding portions (571, 572) of the unit panel blocks (570a; 570b), and may have a shape that has a concave portion between the two fastening portions (581, 582) into which adjacent ends of the first unit panel block (570a) and the second unit panel block (570b) are fitted.

FIG. 19 is a schematic perspective view illustrating a floor shielding device according to another embodiment of the present invention.

Referring to FIG. 19, the floor shielding device may include a plurality of unit panel blocks (570a to 570e) and a connecting member (580) that connects two adjacent unit panel blocks. The floor shielding device may be installed to surround the lower side of the shielding structure by the plurality of unit panel blocks (570a to 570e) and the plurality of connecting members (580). Each unit panel block may be basically manufactured by overlapping the inner block and the outer block described with reference to FIG. 7.

Some unit panel blocks (570d to 570e) may be configured to have a form that is disconnected in the middle and to have a fastening portion (551) and a groove (561) on each side facing each other. The fastening portion (551) may be inserted into the groove (561) to function as a single unit panel block so that two unit panel blocks (570d to 570e) are integrally connected.

According to the above-described configuration, by using a lower shielding device having a double structure or a multi-layer structure and being easy to fasten and detach, as well as having a structure capable of surrounding the lower part of the shielding structure, electromagnetic waves passing through the opening on the lower surface of the shielding structure through the space between the lower surface and the floor of the shielding structure can be effectively blocked.

FIG. 20 is a schematic plan view illustrating a floor shielding device according to another embodiment of the present invention.

Referring to Fig. 20, the floor shielding device may have an arc shape or a circle shape depending on the transverse cross-sectional shape of the shielding structure. For example, the floor shielding device may have a plurality of unit panel blocks (550b) and connecting members (560) that connect two adjacent unit panel blocks.

Each unit panel block may be manufactured by basically overlapping the inner block and the outer block described with reference to FIG. 7. In addition, each unit panel block may be configured such that both ends of one side are positioned forward of the middle part on one side, so that one side has a curved shape overall. That is, at least some of the unit panel blocks (550b) may be curved unit panel blocks. Similarly, at least some of the connecting members (560) may be curved connecting members or may have elasticity to the extent of bending. In addition, the connecting members (560) may have a groove, and thereby the fastening member (551) of each unit panel block may be arranged to be inserted into the groove.

In addition, the floor shielding device may further include a fastening member (590) that is integrally installed or detachably attached to at least a portion of the panel blocks (550b) or at least a portion of the connecting members (560). The fastening member (590) may include a means for fastening or supporting at least a portion of the floor shielding device to a lower support or wheel structure that supports a space below the shielding structure, or a component that performs a function corresponding to such a means. For example, the fastening member (590) may include an elastic member, a fitting member, a ring-shaped member, a Velcro-type detachable member, or a combination thereof.

According to the above-described configuration, the floor shielding device may have an arc shape or a circular shape, and may be detachably fixed to a lower support or wheel structure that supports a space below the shielding structure. Accordingly, a user of the floor shielding device can effectively block electromagnetic waves passing through an opening on the lower surface of the shielding structure through the lower space between the lower surface of the shielding structure and the floor, thereby securing the shielding performance of the shielding structure, while temporarily opening the lower space as needed to utilize the space or check the status of the space.

A method for automatically manufacturing, utilizing, or implementing at least a portion of a floor shielding device according to an embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes any type of recording device that stores information readable by a computer system. Furthermore, the computer-readable recording medium can be distributed across network-connected computer systems, such that the computer-readable program or code can be stored and executed in a distributed manner.

Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

While some aspects of the present invention have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one or more of the most important method steps may be performed by such a device.

In embodiments, a programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described herein. In embodiments, the field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims (1)

As a floor shielding device that blocks electromagnetic waves transmitted through openings in the lower surface or bottom surface of a shielding structure,
An inner block containing an electromagnetically lossy material; and
An outer block fixedly connected to the inner block and formed of a metallic material;
Including,
The above inner block and the above outer block form a panel block of a double structure or a laminated structure,
A floor shielding device wherein the panel block is installed to block electromagnetic waves on at least one side of a gap between the lower surface of the shielding structure and the floor on which the shielding structure is installed.