KR20210119902A - Shielding structure for shielding electromagnetic interference, ethernet cable and cord - Google Patents

Abstract

The present invention relates to an Ethernet cable with a carbon fiber-metal wire composite braided structure. More particularly, the present invention relates to a shielding structure for EMI shielding with respect to a cable core, an Ethernet cable including the structure, and a cord including the structure and the cable. With the shielding structure of the present invention, at least one metal lead wire braid in addition to at least one carbon fiber braid can be braided together, and thus the at least one metal lead wire braid can be used for ground connection to a plug or a connecting material. Accordingly, the Ethernet cable including the shielding structure is capable of retaining the advantages of a carbon fiber of weight reduction and flexibility while preventing a decline in EMI shielding performance by preventing carbon fiber disconnection attributable to crimped connection. In addition, since the shielding structure of the present invention includes the at least one highly conductive metal lead wire braid, the ground performance of the cord can be improved in a case where the Ethernet cable connects network equipment in the form of a cord, and thus the inter-network equipment ground level difference can be reduced and a decline in communication performance attributable to poor equipment grounding can be prevented.

Description

SHIELDING STRUCTURE FOR SHIELDING ELECTROMAGNETIC INTERFERENCE, ETHERNET CABLE AND CORD

The present invention relates to an Ethernet cable to which a carbon fiber and metal wire composite shielding structure is applied. More particularly, the present invention relates to a shielding structure for EMI shielding for a cable core, an Ethernet cable including the same, and a cord including the same.

The Ethernet cable is for implementing Ethernet, which is one of the local area networks, and the quality of the local area communication may be determined according to the performance of the Ethernet cable. Recently, as issues such as the expansion of digital social networks, the 4th industrial revolution, the development of IoT technology, 5G, big data, and artificial intelligence (AI) are getting attention, it is necessary to digest the increasing IP traffic and transmit data smoothly at high speed. Ethernet technology and products are widely used in the market for this purpose.

As the transmission/reception speed of data through the Ethernet cable increases, that is, as the Ethernet communication speed increases in response to the increasing demand, the frequency of the communication signal may increase. In particular, in a high-frequency region of 250 MHz or higher, the characteristics of an Ethernet cable serving as a transmission medium of a communication signal may become more important. As the frequency increases, crosstalk between twisted pairs inside the Ethernet cable and alien crosstalk by other cables outside the Ethernet cable may increase, and thus signal loss and noise may increase, resulting in communication quality this may be lowered.

Various electromagnetic interference (EMI) shielding means may be employed in the Ethernet cable in order to prevent deterioration of communication quality due to the increase in frequency as described above. For example, a metal foil such as aluminum tape or a mesh-type shielding structure in which a plurality of braids are intertwined may be utilized for EMI shielding in an Ethernet cable.

With respect to the structure for EMI shielding, carbon fiber may be a constituent material of the shielding structure. As disclosed in Korean Patent Application Laid-Open No. 10-2018-0067104, when the shielding layer is formed using carbon fiber, the cable can have high flexibility while maintaining the shielding performance, and the weight of the cable can be reduced. have.

However, carbon fiber has a higher tensile strength than a metal wire in the longitudinal direction, but may be relatively weak in the cross-sectional direction. Therefore, when a shielding structure made of carbon fiber is employed in an Ethernet cable, a problem may occur in connection with a plug or a connecting material of the Ethernet cable. In particular, in the case of the grounding connection, since the Ethernet cable and the plug are connected in a crimping method, there is a risk that the carbon fiber may be disconnected during the grounding connection process, and accordingly, the EMI shielding performance may be deteriorated.

In addition, as disclosed in Korean Patent Application Laid-Open No. 10-2020-0039255, it is also possible to realize the weight reduction of the cable by controlling the electrical conductivity of the shielding tape and the coating thickness and carbon fiber density of the metal material contained therein.

However, in the case of the technology disclosed in the above document (Korean Patent Application Laid-Open No. 10-2020-0039255), it is difficult to precisely control the conductivity during coating, and as the manufacturing process becomes complicated due to the coating procedure, the cost rises to reduce the manufacturing cost. There is a problem with height.

On the other hand, the Ethernet cable may connect various network devices in the form of a cord having both ends connected to a plug or a connecting material. When such a code is connected between network devices, in addition to the function of transmitting and receiving communication signals between the network devices, the code is a ground level between the network devices to prevent deterioration of communication quality due to high-speed data communication. may additionally have a function that substantially equals . However, when the shielding structure of the cord is formed of only carbon fiber, communication performance degradation, etc. may be a problem due to noise caused by mismatch of ground levels between network devices.

Patent Document 1: Korean Patent Publication No. 10-2018-0067104 Patent Document 2: Korean Patent Publication No. 10-2020-0039255

The technical problem to be solved by the present invention is that the carbon fiber may be disconnected when an Ethernet cable including a shielding structure composed of conventional carbon fibers forms a ground connection with a plug or a connecting material, so that the shielding performance may be lowered. , and to provide an improved structure of the shielding structure in order to solve a problem that may occur due to a mismatch of grounding levels between network devices connected through a cord when the shielding structure is formed only of carbon fiber.

As a means for solving the above technical problem, the shielding structure for EMI (electromagnetic interference) shielding for the cable core according to an aspect of the present invention, in the shielding structure for EMI (electromagnetic interference) shielding for the cable core , at least one carbon fiber braid each consisting of a plurality of carbon fibers; and at least one metal conductor ply, each of which is composed of a plurality of metal conductors, wherein the at least one carbon fiber ply and the at least one metal conductor ply have a shape in which they are intertwined, and surround the cable core. To provide a shielding structure.

In addition, the present invention provides a shielding structure, characterized in that the sum of the cross-sectional areas of the at least one carbon fiber braid is greater than the sum of the cross-sectional areas of the at least one metal lead wire braid.

In addition, the present invention provides a shielding structure, characterized in that the sum of the number of the at least one carbon fiber ply and the number of the at least one metal lead ply is a multiple of 8.

In addition, the present invention provides a shielding structure, characterized in that the number of the at least one carbon fiber braid is 7, and the number of the at least one metal lead wire braid is 1.

In addition, the present invention provides a shielding structure, characterized in that the diameter of each of the plurality of metal conductors is 0.05 mm to 0.70 mm.

In addition, the present invention provides a shielding structure, characterized in that the shielding structure satisfies Equation 1 below.

[Formula 1]

P ≤ 4mm

In Equation 1, P is a braided pitch length (mm) of at least one metal wire braid in the shielding structure.

In addition, the present invention, in the shielding structure for EMI (electromagnetic interference) shielding for a cable core, each comprising a plurality of composite braiding consisting of a plurality of carbon fibers and at least one metal conductor, the plurality of The composite braid has a shape interwoven with each other, and provides a shielding structure, characterized in that it surrounds the cable core.

In addition, the present invention provides a shielding structure, characterized in that the ratio of the sum of the cross-sectional areas of the at least one metal conducting wire to the total of the cross-sectional areas of the plurality of composite braids is 50% or less.

In addition, the present invention provides a shielding structure, characterized in that the ratio of the sum of the cross-sectional areas of the at least one metal conducting wire to the total of the cross-sectional areas of the plurality of composite braids is 15% or less.

In addition, the present invention, in the Ethernet cable including the above-mentioned shielding structure, the cable core including at least one twisted pair part wrapped by the shielding structure; And it provides an Ethernet cable, characterized in that it further comprises a sheath portion surrounding the shielding structure.

In addition, the present invention is characterized in that each of the at least one stranded wire portion includes a pair of sheathed conductors twisted in a spiral, and each of the pair of sheathed conductors includes a conductor and an insulator covering the conductor. , an Ethernet cable is provided.

In addition, the present invention provides an Ethernet cable, characterized in that it further comprises a separator for separating the at least one twisted pair part from each other in the cable core.

In addition, the present invention provides an Ethernet cable, characterized in that it further comprises a stone wire for ground connection between devices connected to both ends of the Ethernet cable.

In addition, the present invention provides an Ethernet cable, characterized in that the Ethernet cable satisfies Equation 2 below.

[Formula 2]

P ≤ 4mm

In Equation 2, P is a braided pitch length (mm) of at least one metal conductor braid in the Ethernet cable.

In addition, the present invention provides, in the cord including the above-described Ethernet cable, further comprising a pair of plugs respectively connected to both ends of the Ethernet cable.

In addition, the present invention provides a code, characterized in that the code satisfies Equation 3 below.

[Equation 3]

P ≤ CL

In Equation 3, P denotes a braided pitch length (mm) of at least one metal conductor braid in the cord, and CL denotes a shielding connection length (mm) of the plug.

In addition, the present invention provides a code, characterized in that the code satisfies Equation 4 below.

[Equation 4]

P ≤ 4mm

In Equation 4, P is the braided pitch length (mm) of at least one metal conductor plying in the cord.

According to the shielding structure according to the present invention, in addition to at least one carbon fiber braid, at least one metal lead wire braid can be braided together, so that at least one metal lead wire braid can be utilized for a ground connection with a plug or a connecting material. While the Ethernet cable including the shielding structure has the advantages of light weight and flexibility due to carbon fiber, it is possible to prevent the carbon fiber from being disconnected by the crimping method, thereby preventing the EMI shielding performance from being deteriorated.

In addition, in the shielding structure according to the present invention, in the aspect that the shielding structure includes at least one metal wire braid having high conductivity, when an Ethernet cable connects network devices in the form of a cord, the grounding performance of the cord is improved Therefore, it is possible to reduce the difference in the ground level between the network devices, and thus, it is possible to prevent deterioration of communication performance due to a grounding defect between the devices.

The accompanying drawings are intended to explain the contents of the present invention in more detail to those skilled in the art, but the technical spirit of the present invention is not limited thereto.
1 is a view showing a cross-section of a conventional Ethernet cable for explaining the elements constituting the conventional Ethernet cable.
2 is a diagram illustrating an example in which a conventional Ethernet cable is actually implemented.
3 is a diagram illustrating a cross-section of an Ethernet cable for explaining elements constituting the Ethernet cable according to some embodiments.
4 is a view for explaining a specific form in which a shielding structure according to some embodiments is formed.
5 is a view for explaining the shape of a general shielding plug fastened to both ends of an Ethernet cable to which a shielding structure is applied according to some embodiments.
6 is a photograph of an experimental device for evaluation of flexibility in an experimental example of the present invention.
7 is a graph showing the evaluation results for the flexibility evaluation among the experimental examples of the present invention.
8 is a view showing an evaluation method for ground level evaluation and an actual evaluation photograph in an experimental example of the present invention.
9 is a view showing the final evaluation result for the ground level evaluation among the experimental examples of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The description below is only for specifying the embodiments, and is not intended to limit or limit the scope of rights according to the present invention. What a person of ordinary skill in the art related to the present invention can easily infer from the detailed description and embodiments of the present invention should be construed as belonging to the scope of the present invention.

Although the terms used in the present invention have been described as general terms widely used in the technical field related to the present invention, the meaning of the terms used in the present invention is the intention of a technician in the relevant field, the emergence of new technology, examination standards or precedents. It may vary depending on Some terms may be arbitrarily selected by the applicant, and in this case, the meaning of the arbitrarily selected terms will be described in detail. Terms used in the present invention should be interpreted as meanings reflecting the overall context of the specification, not just dictionary meanings.

Terms such as 'consisting of' or 'comprising' used in the present invention should not be construed as necessarily including all of the components or steps described in the specification, and if some components or steps are not included, And when additional components or steps are further included, it should also be construed as intended from the term.

Terms including an ordinal number such as 'first' or 'second' used in the present invention may be used to describe various components or steps, but the components or steps should not be limited by the ordinal number. . Terms containing an ordinal number should only be construed for the purpose of distinguishing one element or step from other elements or steps.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Detailed description of matters widely known to those of ordinary skill in the art related to the present invention will be omitted.

1 is a view showing a cross-section of a conventional Ethernet cable for explaining the elements constituting the conventional Ethernet cable.

Referring to FIG. 1 , a conventional Ethernet cable 10 may include at least one twisted pair part 2 and a sheath part 4 . Each of the at least one stranded wire portion 2 may be composed of a pair of helically twisted conductors, and each conductor includes a conductor 1-1, such as a copper wire, and an insulator covering the conductor 1-1. 1-2) can be configured. If necessary, the conventional Ethernet cable 10 may further include a separator 3 for separating at least one twisted pair part 2 from each other.

The conventional Ethernet cable 10 may be used as a general communication cable. In response to the increasing demand for data transmission, standardization of 40G/100G Ethernet such as IEEE 802.3ba has been completed, and Ethernet technologies and products of 10 Gbps to 40 Gbps are generally utilized in the market.

In the conventional Ethernet cable 10 , crosstalk such as near end cross-talk (NEXT) or far end cross-talk (FEXT), or EMI phenomenon such as alien crosstalk may occur. When a plurality of conventional Ethernet cables 10 are bundled in a building or when an external cable exists nearby, alien crosstalk may occur in the conventional Ethernet cable 10 .

In particular, when the frequency of the communication signal of the conventional Ethernet cable 10 increases according to the speed of data transmission, the above EMI phenomenon may intensify, so that the quality of data transmission through the conventional Ethernet cable 10 may be deteriorated. can Therefore, in order to prevent deterioration of data transmission quality even in a high-speed data transmission environment, it may be required to improve the structure of the Ethernet cable so that EMI shielding can be provided.

2 is a diagram illustrating an example in which a conventional Ethernet cable is actually implemented.

2, the actual implementation form of the conventional Ethernet cable 10 is shown. The conventional Ethernet cable 10 may also be referred to as a UTP cable or a LAN cable.

In order to facilitate the connection with the network equipment, both ends of the conventional Ethernet cable 10 may be connected to a plug or connecting material such as an RJ45 modular type plug, and may be used in the form of a cord.

When both ends of the conventional Ethernet cable 10 are connected to a plug or a connection material, particularly when forming a ground connection, one end of the conventional Ethernet cable 10 is mainly fixed to the plug or connection material by a crimping method. A strong pressure can act on the cable 10 in the cross-sectional direction, ie in a direction orthogonal to the longitudinal direction.

As described above, when the Ethernet cable forms a ground connection with a plug or a connection material, a large pressure in the cross-sectional direction may be applied by compression in the cross-sectional direction. Disconnection of carbon fibers constituting the shielding structure may occur, and thus the performance of EMI shielding by the shielding structure may be deteriorated.

Therefore, in order to improve the usability and convenience of the Ethernet cable by allowing a ground connection between the Ethernet cable and the plug or the connecting material to be smoothly formed, so that the shape of the shielding structure is not deformed even when compression in the cross-sectional direction is performed, the shielding structure It may be required to improve the physical properties of

3 is a diagram illustrating a cross-section of an Ethernet cable for explaining elements constituting the Ethernet cable according to some embodiments.

Referring to FIG. 3 , the Ethernet cable 20 according to the present invention may further include a shielding structure 100 in addition to at least one twisted pair part 2 and the sheath part 4 . Similarly, the Ethernet cable 20 may further include a separator 3 for separating at least one twisted pair part 2 from each other in the cable core 200 . However, the present invention is not limited thereto, and other general-purpose components other than the components shown in FIG. 3 may be further included in the Ethernet cable 20 .

In the Ethernet cable 20 , the shielding structure 100 may be formed between the cable core 200 and the sheath 4 . The cable core 200 is a space in which at least one twisted pair part 2 and the separator 3 are built, and may be surrounded by the shielding structure 100 .

As described above in FIG. 2 , each of the at least one twisted pair part 2 included in the Ethernet cable 20 may include a pair of sheathed conductors twisted in a spiral, and each of the pair of sheathed conductors is a conductor. (1-1) and an insulator 1-2 covering the conductor 1-1 may be included.

In addition, the Ethernet cable 20 may include a separator 3 if necessary. According to the separator 3 , at least one stranded wire part 2 may be separated from each other in the cable core 200 . The separator 3 may be formed of a material such as polyethylene.

When the at least one twisted-pair part 2 is separated from each other, it is possible to prevent the at least one twisted-pair part 2 from being tangled inside the Ethernet cable 20, and also to separate the at least one twisted-pair part by physical space. Since the signal coupling between the parts 2 may be reduced, the crosstalk of the Ethernet cable 20 may be partially reduced.

The Ethernet cable may further include a stone lead wire (not shown) for ground connection between devices connected to both ends of the Ethernet cable.

In the Ethernet cable 20 , since the cable core 200 may be surrounded by the shielding structure 100 before being built into the sheath 4 , EMI shielding for the cable core 200 may be provided. That is, even when a plurality of Ethernet cables 20 are bundled or there are other cables around, it is possible to prevent electromagnetic signals from penetrating into the cable core 200 by the shielding structure 100, so that at least one It can be prevented that the communication signal transmitted along the twisted pair part 2 is distorted or noise is generated.

In addition, in the reverse case, the Ethernet cable 20 can be prevented from affecting the communication signal by causing an EMI phenomenon in other communication cables in the vicinity. That is, since both the EMI influence received from the Ethernet cable 20 and the EMI influence given to the outside can be reduced, in particular, when a plurality of Ethernet cables 20 are bundled or various cables are mixed, the EMI shielding The effect may be further increased. Meanwhile, although not shown in FIG. 3 , the Ethernet cable 20 may be formed in a double shielding structure by additionally including a metal thin film such as an aluminum tape in addition to the shielding structure 100 . When an aluminum tape or the like is additionally provided, the EMI shielding performance of the Ethernet cable 20 may be further improved.

In addition, as the shielding structure 100 is additionally provided to the Ethernet cable 20 , when a pair of plugs are respectively connected to both ends of the Ethernet cable 20 to form a cord, network equipment connected by the cord Grounding performance is improved, and noise due to a ground level difference may be reduced.

4 is a view for explaining a specific form in which a shielding structure according to some embodiments is formed, and FIG. 5 is a view for explaining a form of a general shielding plug fastened to both ends of an Ethernet cable to which a shielding structure according to some embodiments is applied is a drawing for

Referring to FIG. 4 , the form in which the shielding structure 100 surrounding the side surface of the cable core 200 is spread out is shown in the Ethernet cable 20 . As shown, the shielding structure 100 has a plurality of braids woven or twisted with each other, and may surround the side surface of the cable core 200 in a mesh-like shape.

The braided structure of the braids constituting the shielding structure 100 as described above may be formed by rotating the plurality of braids along the outer circumferential surface of the cable core 200 with the cable core 200 as the center. According to the setting of the braiding machine forming the shielding structure 100 , the shielding characteristics may be determined by adjusting the braiding piece α, the braiding pitch P, the filling factor, and the braid density. .

Referring to FIG. 5 , the shielding plug 300 includes a housing 310 , a shielding contact part 320 , and a boot 330 .

In one example, the shielding structure may satisfy Equation 1 below.

[Formula 1]

P ≤ 4mm

In Equation 1, P is a braided pitch length (mm) of at least one metal wire braid in the shielding structure. In this case, reference may be made to FIG. 4 .

The Ethernet cable to which the shielding structure according to the present invention is applied should minimize the ground level difference between the devices connected to both sides through plugs fastened at both ends in the form of a cord. In relation to Equation 1, in order to secure the grounding characteristic, when plugs are fastened at both ends of the Ethernet cable in the form of a cord, the shielding contact part 320 is electrically connected to the shielding structure by physically direct contact with the shielding structure through compression. In the length CL of the contact portion in the longitudinal direction of the cable, the metal lead braid 120 should be included in one pitch or more. That is, the electrical conductivity of the entire shielding structure becomes uniform only when the metal lead wire braiding 120 having high conductivity is in contact with the shielding contact part 320 for a predetermined length or more, so that the ground level difference between the devices connected to both sides of the cord is minimized. can

In one example, when the contact length CL of the shield connection part of the plug is 2 mm to 4 mm, the length of one pitch of plying of the shield structure is such that the metal lead ply within the contact length must be in direct contact with the contact part. The length of the contact portion should be 4 mm or less, and the shorter the pitch, the more uniform conductivity may be.

In addition, the shielding structure 100 may be composed of a plurality of braided yarns, and each of the plurality of braided yarns may again be composed of a plurality of strands or fibers. The number of the plurality of plying yarns constituting the shielding structure 100 may be referred to as the number of strokes, and the number of strands or fibers constituting each of the plurality of plying yarns may be referred to as an exponent or multiplier.

For example, apart from the example shown in FIG. 4 , when the index of the shielding structure 100 is 4 and the number of strokes is 8, the shielding structure 100 is braided with 8 braids, and the 8 braids Each may consist of 4 strands or fibers. The number of strokes and the index (or the sum) of the shielding structure 100 may be determined as various numerical values depending on the design.

The shielding structure 100 does not completely surround the side of the cable core 200, but may surround it with some gaps like a mesh structure, so when compared with the form of a shielding thin film such as a tape or film that completely surrounds it, Ethernet The bending of the cable 20 can be made easier. Accordingly, the flexibility of the Ethernet cable 20 can be increased when EMI shielding is provided by the shielding structure 100 .

The flexibility of the Ethernet cable 20 due to the shielding structure 100 may also be affected by the materials of the braids constituting the shielding structure 100 . That is, properties such as flexibility and weight characteristics of the Ethernet cable 20 may be variously changed according to what is a constituent material of the shielding structure 100 .

Hereinafter, while the Ethernet cable 20 has both flexibility and light weight characteristics, the Ethernet cable 20 improves connectivity with an existing LAN cable plug or connection material such as an RJ45 type plug, so that the Ethernet cable 20 is While smoothly performing EMI shielding, the utility and convenience of the Ethernet cable 20 are improved, and when both ends of the Ethernet cable 20 are connected to a pair of plugs and formed in the form of a cord, it is connected through a cord. An improved structure of the shielding structure 100 may be described such that the grounding performance between network devices is improved.

Looking at the cross-sectional shape of the shielding structure 100 formed along the outer circumferential surface of the cable core 200, the shielding structure 100 for EMI shielding for the cable core 200 is at least one carbon fiber braid 110. and at least one metal lead ply 120, at least one carbon fiber ply 110 and at least one metal lead ply 120 have a shape intertwined with each other and surround the cable core 200 have. That is, the at least one carbon fiber ply 110 and the at least one metal lead ply 120 may have a shape intertwined along the outer circumferential surface of the cable core 200 .

Each of the at least one carbon fiber braid 110 may be composed of a plurality of carbon fibers. Each of the at least one carbon fiber braid 110 may be formed integrally by aggregating a plurality of carbon fibers to fit a specific size. However, the present invention is not limited thereto, and a plurality of carbon fibers may form at least one carbon fiber braid 110 in various ways other than the illustrated method.

Carbon fiber constituting the plurality of carbon fibers refers to a fiber-type material containing a carbon component, and may have higher elastic modulus, tensile strength in the longitudinal direction, heat resistance and impact resistance compared to general metal materials, It may have a lower weight than a general metal material. Therefore, when at least one carbon fiber braid 110 is included in the shielding structure 100 instead of the shielding structure 100 being entirely formed of a metal material, the flexibility of the shielding structure 100 can be increased, and the weight can be reduced. can be made

Each of the at least one metal conductive wire ply 120 may be composed of a plurality of metal conductive wires. Each of the at least one metal conductor ply 120 may be composed of four metal conductors. That is, the sum or index of the at least one metal lead wire ply 120 may be four. However, the present invention is not limited thereto, and the sum or index of the at least one metal lead wire ply 120 may also be implemented as various values other than 4 .

In one example, the Ethernet cable may satisfy Equation 2 below.

[Formula 2]

P ≤ 4mm

In Equation 2, P is a braided pitch length (mm) of at least one metal conductor braid in the Ethernet cable.

In relation to Equation 2, when the Ethernet cable also includes the above-described shielding structure, for example, when the contact length of the shield connection part of the plug for securing the shielding property according to the present invention is 2 mm to 4 mm, the The length of the shielding structure including the one pitch of the plying should be less than or equal to the length of the contact so that the metal lead ply within the length of the contact is in direct contact with the contact.

The material of the plurality of metal conductive wires may be copper (Cu). That is, the at least one metal lead wire ply 120 may be a copper wire braid. However, the material is not limited thereto, and a material other than copper (Cu) that may have an appropriate strength for compression in the cross-sectional direction of the Ethernet cable 20 may constitute the plurality of metal conductors.

The number of strokes of the shielding structure 100 may be determined by the number of at least one carbon fiber ply 110 and the number of at least one metal lead ply 120 . That is, the sum of the number of the at least one carbon fiber ply 110 and the number of the at least one metal lead ply 120 may be the number of strokes of the shielding structure 100 . In one example, the number of strokes of the shielding structure 100 is 8, and accordingly, the sum of the number of the at least one carbon fiber plying 110 and the number of the at least one metal lead plying 120 may be 8.

Even when the number of strokes of the shielding structure 100 is the same, the physical properties of the shielding structure 100 may vary according to the number of each of the at least one carbon fiber ply 110 and the at least one metal lead ply 120 . Accordingly, the number of each of the at least one carbon fiber plying 110 and the at least one metal lead plying 120 may be determined according to a design intention for the shielding structure 100 to have specific physical properties.

For example, the number of the at least one carbon fiber ply 110 may be greater than the number of the at least one metal lead ply 120 . As the specific gravity of the at least one carbon fiber plying 110 increases, the flexibility and weight reduction characteristics of the shielding structure 100 may be improved, while the at least one metal lead plying 120 is Ethernet including the shielding structure 100 . Since this is to improve the connection characteristics of the cable 20 with the plug or the connecting material, the specific gravity of the at least one carbon fiber braid 110 in the shielding structure 100 may be set to be larger.

Meanwhile, the description of the relative number of pliers as described above may relate to a case in which the at least one carbon fiber ply 110 and the at least one metal lead ply 120 have the same cross-sectional area. When the at least one carbon fiber ply 110 and the at least one metal lead ply 120 have different cross-sectional areas, the cross-sectional areas of the plyings, not the number of plyings, may be directly compared. That is, in the shielding structure 100 , the sum of the at least one carbon fiber ply 110 may be greater than the sum of the cross-sectional areas of the at least one metal lead ply 120 .

When the sum of the cross-sectional areas of the at least one carbon fiber ply 110 is greater than the sum of the cross-sectional areas of the at least one metal lead ply 120, the at least one metal lead wire while maintaining the improvement in flexibility and weight reduction properties due to the carbon fiber The connection characteristics of the Ethernet cable 20 including the shielding structure 100 may be improved through the braiding 120 . In other words, while maintaining flexibility and weight reduction characteristics, it is possible to efficiently prevent deterioration of EMI shielding performance due to disconnection of carbon fiber due to ground connection, etc., thereby satisfying the shielding properties specified in IEC61156-6 and EN50288-5-1.

For example, the number of strokes of the shielding structure 100 may be a multiple of 8, such as 8, 16 and 24, in this case, the number of at least one carbon fiber ply 110 and at least one metal lead ply 120 . The sum of the number of may be any one of 8, 16, and 24, among which the specific gravity of at least one carbon fiber ply 110 is set to be larger, so that the sum of the cross-sectional areas of the at least one carbon fiber ply 110 is It may be greater than the sum of the cross-sectional areas of the at least one metal lead ply 120 .

Specifically, in one example, when the number of strokes of the shielding structure 100 is 8 (some not shown), the number of at least one carbon fiber ply 110 may be 7, and at least one metal lead ply 120 ) may be 1. In this way, since the connectivity with the plug or the connecting material of the Ethernet cable 20 can be improved only with the single metal lead wire braiding 120 alone, the utility and convenience of the Ethernet cable 20 can be improved while maintaining the advantages of carbon fiber. can be improved

Meanwhile, in relation to the plurality of metal wires constituting each of the at least one metal wire braid 120 , the minor wire diameters of the plurality of metal wires may be formed in various numerical values. The wire diameter refers to the diameter of the cross-section of each of the plurality of metal wires, for example, the diameter of each of the cross-sections of the plurality of metal wires may be 0.05 mm to 0.70 mm. However, the present invention is not limited thereto, and the index and number of strokes of the shielding structure 100 , the number of at least one metal wire braid 120 , and the like, braided density of the shielding structure 100 and connection characteristics with plugs or connecting materials due to these, etc. In consideration of , the diameter of the cross-section of each of the plurality of metal conductors may be formed in various values other than 0.05 mm to 0.70 mm.

In addition, according to the above salpin bar, the carbon fiber component and the metal conductive wire component constituting the shielding structure 100 were separately provided as at least one carbon fiber ply 110 and at least one metal conductive wire ply 120, respectively, but differently , a carbon fiber component and a metal lead component may constitute a plurality of composite braids (not shown), and the shielding structure 100 may be constituted of a plurality of composite braids.

Specifically, the shielding structure 100 for shielding EMI for the cable core may include a plurality of composite braids, each of which is composed of a plurality of carbon fibers and at least one metal conductor, and the plurality of composite braids are connected to each other. It may have a woven shape and surround the cable core 200 .

Even in the case of the shielding structure 100 composed of a plurality of composite braids, a ratio of the sum of the cross-sectional areas of the at least one metal conducting wire to the total of the cross-sectional areas of the plurality of composite braids may be 50% or less. Preferably, a ratio of the sum of the cross-sectional areas of the at least one metal conductor to the total of the cross-sectional areas of the plurality of composite braids may be 15% or less.

According to the above ratio, since the plurality of composite braids may contain a high ratio of carbon fiber components, the light weight characteristics and flexibility of the shielding structure 100 are maintained, and shielded by the metal lead component partially included in the plurality of composite braids. A connection characteristic of the Ethernet cable 20 including the structure 100 with a plug or a connection material may be improved.

As described above, the Ethernet cable 20 including the shielding structure 100 may be connected to a plug or a connecting material such as an RJ45 type plug. As such, when both ends of the Ethernet cable 20 are connected to a pair of plugs, the Ethernet cable 20 and the pair of plugs may form a cord. That is, the cord including the Ethernet cable 20 may further include a pair of plugs respectively connected to both ends of the Ethernet cable 20 .

The Ethernet cable 20 formed in the form of a cord may include a shielding structure 100 including at least one metal wire braid 120 , and the at least one metal wire braid 120 includes at least one carbon Considering that it may have a higher conductivity compared to the fiber ply 110 , the grounding performance of the cord may be improved compared to the case in which the shielding structure 100 is composed of only at least one carbon fiber ply 110 . Accordingly, since the difference in ground level between network devices connected by the cord can be further reduced, noise due to the ground level difference can be reduced, and communication performance can be improved.

In one example, the code may satisfy Equations 3 and 4 below.

[Equation 3]

P ≤ CL

[Equation 4]

P ≤ 4mm

In Equations 3 and 4, P is the braid pitch length (mm) of at least one metal conductor plying in the cord, and CL is the shield connection length (mm) of the plug.

In relation to Equations 3 and 4, when the code also includes the above-described shielding structure and an Ethernet cable including the same, for example, the contact length of the contact part of the shielding body connection part of the plug for securing the shielding characteristics according to the present invention is limited. In this case, the length of the shielding structure including the one pitch of the plying should be less than or equal to the length of the contact part so that the metal lead wire ply within the length of the contact part should be in direct contact with the contact part.

Hereinafter, the present invention will be described in more detail through specific experimental examples. However, these experimental examples are for illustrative purposes only and the scope of the present invention is not limited to these experimental examples.

1. Light weight evaluation

The cable used in the lightweight evaluation was "Cat6 UTP cable", and as a commonly used metal shield, a UTP cable with a copper braid applied and a UTP cable with a shield according to the present invention, that is, a carbon fiber braid, were compared. The weight per unit length (unit: g/m) was measured for the shielding body with an outer diameter of 5.0 mm.

The measured weights are shown in Table 1 below.

division UTP applied with Cu braid UTP applied with carbon fiber braid braid density braid cable braid cable 30% 5.77 51.96 1.54 66.55 80% 19.36 47.33 5.11 52.30

As can be seen in Table 1, in the case of the UTP cable to which the carbon fiber braid according to the present invention is applied, as a generally used metal shield, compared to the UTP cable to which the copper braid is applied, the weight is reduced by about 20% or more Thus, weight reduction can be realized.

2. Flexibility Assessment

Using the experimental device of FIG. 6, a flexibility evaluation (u-bending test) was performed, and a "Cat6 UTP cable" was used in the flexibility evaluation, and as a commonly used metal shield, only a copper braid (copper braid) was applied. A UTP cable and a UTP cable to which a shield according to the present invention, that is, a copper braid and a carbon fiber braid (composite braid) were simultaneously applied, were compared. Specific flexibility evaluation was performed by measuring the load applied at a point where the bending radius of 20 cm of each Cat6 UTP cable sample was 50 cm.

The measured loads are shown in Table 2 below.

division load (N) specification sample# braid condition Max Min UTP applied with Cu braid One Cu (0.12×3 sum) 16 strokes
Braided density 30% 6.32 3.77 2 4.87 4.04 3 4.33 3.44 average 5.17 3.75 Application of Cu + carbon fiber braid
UTP One CF(3k) 7 strokes +
Cu (0.12×3 sum) 1 stroke
Braided density 44% 4.70 3.14 2 3.36 2.95 3 3.09 2.80 average 3.92 2.97 Average comparison (%, composite braid/copper braid) 71.8% 79.1%

The flexibility evaluation result is graphed and shown in FIG. 7 .

As can be seen in Table 2 and Figure 7, in the case of the UTP cable including the carbon fiber braid according to the present invention (composite braid), as a generally used metal shield, only the copper braid is applied (copper braid) It was confirmed that the flexibility was improved by about 20% or more compared to the UTP cable.

On the other hand, in a wiring system to which an Ethernet cable to which a shielding structure for EMI shielding is applied as in the present invention is applied, in order to minimize system performance degradation due to external interference, a coupling signal generated from a specific twisted pair in the Ethernet cable is It should be transmitted to the ground of the device connected to the cable through the shielding structure, and then again to the building ground. If any one of these ground paths is physically or electrically disconnected or unstable, an open circuit in the system can be formed, resulting in a floating ground state in a specific area. That is, the difference in ground level between specific regions within the system increases, and as a result, the extraterrestrial interference characteristics of the system deteriorate.

Physical or electrical disconnection or instability in these ground paths is particularly likely to occur at cable junctions.

In the present invention, when the shielding structure is composed of only carbon fibers, the connection may be broken or unstable due to physical damage due to the compression-type connection, and even if physically connected, the electrical connection is unstable due to the low conductivity of the carbon fibers, resulting in excellent performance. Extraterrestrial interference characteristics cannot be secured.

Therefore, it was necessary to check whether the common ground level difference came within the normal range through ground level evaluation by applying a high-conductivity metal wire to the carbon fiber wire as a shielding structure material, so an additional experiment was conducted.

3. Earth Level Assessment

FLUKE Networks' Cable Analyzer (DTX-1800) was connected to both ends of a 5ft UTP cable, and the electrical characteristics and link effectiveness of the cable were evaluated through Cable Test Management Software (LINKWARE PC).

In this case, as electrical properties, IL, NEXT, PS NEXT, ACR-F, PS ACR-F, ACR-N, PS ACR-N and RL were evaluated as items.

A detailed evaluation method and an actual evaluation photograph are shown in FIG. 8 , and the final evaluation result is shown in FIG. 9 .

As shown in FIG. 9, it was confirmed that the measurement of the electrical characteristics through the Cable Analyzer was normally completed and it had a grounding resistance value within 10Ω of the grounding resistance of the communication system recommended by ANSI/NFPA-780. It was confirmed that the difference in the ground level is a substantially equivalent level that does not affect other electrical characteristics.

Although the embodiments of the present invention have been described in detail above, the scope of the rights according to the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention described in the following claims are also present It should be interpreted as being included in the scope of rights according to the

1-1: conductor
1-2: insulator
2: at least one twisted pair
3: separator
4: Sheath
10: Conventional Ethernet cable
20: Ethernet cable
100: shielding structure
110: at least one carbon fiber braid
120: at least one metal wire braiding
200: cable core
300: shield plug
310: housing
320: shielding contact
330: boot

Claims (17)

In the shielding structure for EMI (electromagnetic interference) shielding for the cable core,
at least one carbon fiber braid each composed of a plurality of carbon fibers; and
comprising at least one metal wire plying, each of which is composed of a plurality of metal wires,
The shielding structure, characterized in that the at least one carbon fiber braid and the at least one metal lead wire braid have a shape interwoven with each other, and surround the cable core.
The method of claim 1,
A shielding structure, characterized in that the sum of the cross-sectional areas of the at least one carbon fiber ply is greater than the sum of the cross-sectional areas of the at least one metal lead ply.
The method of claim 1,
The shielding structure, characterized in that the sum of the number of the at least one carbon fiber ply and the number of the at least one metal lead ply is a multiple of eight.
4. The method of claim 3,
The number of the at least one carbon fiber ply is 7,
The shielding structure, characterized in that the number of the at least one metal conductor plying is one.
The method of claim 1,
A shielding structure, characterized in that the diameter of each of the plurality of metal conductors is 0.05 mm to 0.70 mm.
The method of claim 1,
The shielding structure is characterized in that it satisfies the following Equation 1, the shielding structure:
[Formula 1]
P ≤ 4mm
In Equation 1, P is a braided pitch length (mm) of at least one metal wire braid in the shielding structure.
In the shielding structure for EMI (electromagnetic interference) shielding for the cable core,
comprising a plurality of composite braids, each composed of a plurality of carbon fibers and at least one metal conductor,
The plurality of composite braids have a shape intertwined with each other, characterized in that it surrounds the cable core, a shielding structure.
8. The method of claim 7,
The shielding structure, characterized in that the ratio of the sum of the cross-sectional areas of the at least one metal conducting wire to the sum of the cross-sectional areas of the plurality of composite braids is 50% or less.
9. The method of claim 8,
The shielding structure, characterized in that the ratio of the sum of the cross-sectional areas of the at least one metal conducting wire to the sum of the cross-sectional areas of the plurality of composite braids is 15% or less.
10. An Ethernet cable comprising the shielding structure of any one of claims 1 to 9,
the cable core including at least one twisted pair part surrounded by the shielding structure; and
Ethernet cable, characterized in that it further comprises a sheath portion surrounding the shielding structure.
11. The method of claim 10,
Each of the at least one twisted pair includes a pair of sheathed conductors twisted in a spiral,
An Ethernet cable, characterized in that each of the pair of sheathed conductors includes a conductor and an insulator covering the conductor.
11. The method of claim 10,
Ethernet cable, characterized in that it further comprises a separator for separating the at least one twisted pair part from each other in the cable core.
11. The method of claim 10,
Ethernet cable, characterized in that it further comprises a stone lead for a ground connection between devices connected to both ends of the Ethernet cable.
13. The method of claim 12,
The Ethernet cable is characterized in that it satisfies the following Equation 2, Ethernet cable:
[Equation 2]
P ≤ 4mm
In Equation 2, P is a braided pitch length (mm) of at least one metal conductor braid in the Ethernet cable.
In the cord comprising the Ethernet cable of claim 10,
A cord further comprising a pair of plugs respectively connected to both ends of the Ethernet cable.
16. The method of claim 15,
The code is characterized in that it satisfies Equation 3 below, the code:
[Equation 3]
P ≤ CL
In Equation 3, P denotes a braided pitch length (mm) of at least one metal conductor plying in the cord, and CL denotes a shielding connection length (mm) of the plug.
17. The method of claim 16,
The code is characterized in that it satisfies the following Equation 4, the code:
[Equation 4]
P ≤ 4mm
In Equation 4, P is the braided pitch length (mm) of at least one metal conductor plying in the cord.

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