Low radiation coaxial cable and method of manufacturing same

Abstract

The application belongs to the technical field of electric power, and discloses a low-radiation coaxial cable, which comprises, from inside to outside, an inner conductor (1), an insulating layer (2), a shielding body (3) and an outer sheath (4), characterized in that: the inner conductor (1) and the outer sheath (4) further have a component for reducing the outward radiation of the inner conductor (1), the component for reducing the outward radiation of the inner conductor (1) comprises a network cable unit, and the network cable unit is composed of eight separate network cable sub-bodies (5), each of which is composed of a network cable conductor (51) and an insulating sleeve (52) wrapped outside the network cable conductor. The application further discloses a manufacturing method. The application has the following main beneficial technical effects: lower carbon and environmental protection, improved construction and production efficiency, and effectively reduced influence of external electromagnetic noise.

Description

Technical Field

[0001] This invention belongs to the field of power technology, and in particular relates to a low-radiation coaxial cable and its manufacturing method. Background Technology

[0002] Coaxial cables are used in mobile communication base stations and also in homes. They generally meet the requirements of the People's Republic of China's recommended standard YD / T 1092, "Communication Cables for Wireless Communication: 50Ω Foam Polyolefin Insulated Corrugated Copper Tube Outer Conductor Radio Frequency Coaxial Cable." However, mobile communication base stations need to transmit not only coaxial radio frequency signals but also network signals, optical signals, and Ethernet signals. Similarly, civilian systems also require radio frequency and network signals. However, current technologies require separate cable transmission, laying, and installation multiple times, increasing cable and installation costs. In homes, coaxial cables and network cables are usually laid separately and connected to different junction boxes. However, user needs differ. For example, network signals are frequently used, which cannot be achieved where coaxial cables are laid, requiring rewiring, increasing costs and damaging the environment. Similarly, similar situations exist in applications requiring radio frequency signals.

[0003] CN118762866A discloses a composite insulated radio frequency coaxial cable with improved heat resistance and its preparation method. The cable includes an inner conductor, a composite insulation layer, and an outer conductor. The composite insulation layer comprises, from the inside out, an inner sheath insulation layer, a middle insulation layer, and an outer sheath insulation layer. The inner sheath insulation layer is a thin-walled insulation layer of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer formed by chemical foaming and extrusion. The middle insulation layer is a blend of high melt strength polypropylene and high-density polyethylene formed by physical foaming and extrusion. The outer sheath insulation layer is a thin-walled insulation layer of polytetrafluoroethylene propylene formed by chemical foaming and extrusion. By using three different thermoplastic materials to create the composite insulation layer, the insulation and heat resistance of the radio frequency coaxial cable are improved while maintaining its communication performance. This effectively reduces manufacturing costs and improves production efficiency, making it suitable for applications in high-power mobile communication base station antenna feeder systems, and demonstrating good application prospects and economic benefits.

[0004] CN1344070A discloses a method for combining data signals and radio frequency signals and transmitting them in cable television cables. The method involves locking the IP data signals transmitted through optical fiber or the baseband data signals demodulated by the cable modem into the 0-50MHz and 50-750MHz frequency bands of the cable television coaxial cable, respectively, and transmitting them to the user's home simultaneously. After filtering and separation, the signals are sent to the television and computer respectively, realizing the shared cable access for television and data in the last mile, effectively reducing the cost of network construction at the user end.

[0005] None of the aforementioned existing technologies solve the technical problems mentioned above. Furthermore, existing network cables generally have eight wires, twisted in pairs. The first method involves twisting four pairs of wires together before covering them with a sheath. The second method places each pair of wires in a corner of a cross-shaped core before covering them with a sheath. The third method places the four pairs of wires parallel to each other and covers them with a sheath. Further, a thin shielding layer may be wrapped around the core of the sheath. In all three methods, each pair of wires needs to be untwisted during splicing, and all wires must be straightened and arranged in the required order. Generally, the blue and green wires need to be swapped, which can lead to some wire misalignment and hinders cable management. Untwisting also slows down the installation process. Therefore, even skilled workers often experience poor splicing quality due to poor cable management. In addition, with a large number of splices, the amount of cable management is increased, leading to greater hand wear for the workers. Existing coaxial cables typically only have an outer conductor for shielding. Therefore, the shielding performance of existing network cables and coaxial cables needs to be further improved. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to disclose a low-radiation coaxial cable and its manufacturing method, which is achieved using the following technical solution.

[0007] A low-radiation coaxial cable comprises, from the inside out: an inner conductor, an insulation layer, a shield, and an outer sheath. Between the inner conductor and the outer sheath, there is a component for reducing radiation from the inner conductor to the outside. The component for reducing radiation from the inner conductor to the outside includes a network cable unit. The network cable unit is composed of eight separate network cable sub-units. Each network cable sub-unit consists of a network cable conductor and an insulation sleeve covering the network cable conductor.

[0008] The aforementioned low-radiation coaxial cable has a shielding body composed of an outer conductor. The outer edge of the insulation layer has eight grooves distributed circumferentially, each groove containing a network cable sub-body. The outer conductor covers the insulation layer and the network cable sub-body. The outer wall of the outer conductor has circumferentially continuous outer grooves.

[0009] The aforementioned low-radiation coaxial cable has a shielding body composed of an outer conductor and an insulation layer composed of a first insulator layer, a second insulator layer, and a third insulator layer distributed sequentially from the outside to the inside. The outer edge of the first insulator layer has four first grooves distributed circumferentially, each containing a network cable sub-body. The outer conductor covers the first insulator layer and the network cable sub-body within the first grooves. The outer edge of the second insulator layer has four second grooves distributed circumferentially, each containing a network cable sub-body. The first grooves of the first insulator layer and the second grooves of the second insulator layer are spatially staggered, and the projection of all the first grooves and all the second grooves onto the center of the inner conductor covers at least a complete circle. The outer wall of the outer conductor has a circumferentially continuous outer groove.

[0010] The aforementioned low-radiation coaxial cable has a shielding body consisting of an outer conductor and a shielding layer. The shielding layer covers the outside of the insulation layer, and the inner surface of the outer conductor is tightly covered by the shielding layer. The inner wall of the outer conductor has eight inner grooves distributed circumferentially, each inner groove containing a network cable sub-body. The outer wall of the outer conductor has a circumferentially continuous outer groove.

[0011] In the aforementioned low-radiation coaxial cable, the dimensions of the inner surface of the outer conductor are the smallest on the cross-section of the inner groove and the insulating sleeve, and the dimensions gradually increase from the inner surface of the outer conductor to the outer surface of the outer conductor.

[0012] The aforementioned low-radiation coaxial cable has an inner groove whose cross-section is a part of a fan-shaped annulus, and an insulating sleeve whose cross-section is a part of a fan-shaped annulus that matches the cross-section of the inner groove; matching means that the insulating sleeve can fill the inner groove.

[0013] The aforementioned low-radiation coaxial cable has a width that gradually increases from the opening of the inner groove to the bottom of the inner groove, and the cross-section of the inner groove is an isosceles trapezoid.

[0014] The aforementioned low-radiation coaxial cable has a shielding layer made of aluminum foil, copper foil, braided steel wire mesh, or braided copper wire mesh.

[0015] The aforementioned low-radiation coaxial cable has a shielding layer that covers the opening of the inner groove.

[0016] The aforementioned low-radiation coaxial cable, with its circumferential loop designation, refers to the outer groove being circumferentially continuous throughout the entire outer wall of the outer conductor, spanning 360 degrees.

[0017] The aforementioned low-radiation coaxial cable has external grooves that are spaced apart or spirally distributed along the extension direction of the outer conductor.

[0018] The aforementioned low-radiation coaxial cable has a network cable sub-body that is evenly distributed around the circumference of the outer conductor.

[0019] A method for manufacturing the aforementioned low-radiation coaxial cable includes the following steps:

[0020] Step 1: Continuously extend the inner conductor forward, ensuring that the extended inner conductor is straight before entering the extruder head;

[0021] Step 2: Inside and outside the extruder head, the insulating layer is continuously wrapped around the inner conductor to form an inner insulator. The inner insulator is continuously pulled through the extruder head, dried after passing through the cooling water tank, and then pulled forward.

[0022] Step 3: Wrap the shielding layer over the inner insulator to form a shielding insulator;

[0023] Step 4: Before covering the shielding insulator with the outer conductor, the outer conductor is manufactured. The method for manufacturing the outer conductor is as follows: Take a metal sheet with smooth upper and lower surfaces and continuously stretch it through a corrugating or grooving mechanism to form a metal sheet with external grooves on the surface. When the corrugating or grooving mechanism is a gear with closely opposed upper and lower parts, external grooves are formed on both the upper and lower surfaces of the metal sheet; when the upper part of the corrugating or grooving mechanism is a flat surface and the lower part is a gear, an external groove is formed on the lower surface of the metal sheet. Before corrugating or grooving, fix the shape of the inner groove at the corresponding position of the inner groove. When a matching metal strip or sheet is drawn through a corrugating or grooving mechanism, it passes along the metal strip and forms an outer groove on the surface of the metal sheet, ultimately forming an outer conductor. The network cable sub-body is embedded in the inner groove, and then the outer conductor is wrapped around the shielding insulator. During wrapping, the outer conductor is wound to form an inner cavity located inside the outer conductor, so that the shielding insulator is located inside the inner cavity of the outer conductor, and the surface of the outer conductor with the network cable sub-body embedded inside is in close contact with the shielding insulator, so that the two ends of the outer conductor are welded together to form a welding surface; thus forming an outer shielding body.

[0024] Step 5: Extrude the outer sheath onto the outer shielding body to complete the manufacturing of the low-radiation coaxial cable.

[0025] This application has the following main beneficial technical effects: it is lower carbon footprint and more environmentally friendly, improves construction and production efficiency, and effectively reduces the impact of external electromagnetic noise. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a three-dimensional structure after dissection, as shown in Example 1.

[0027] Figure 2 for Figure 1 Enlarged cross-sectional structural diagram.

[0028] Figure 3 This is an enlarged cross-sectional schematic diagram of the network cable sub-body 5 and the outer conductor 31 after assembly.

[0029] Figure 4 This is a schematic diagram of the cross-sectional structure of the outer conductor 31 after welding.

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure for implementing Example 2.

[0031] Figure 6 A schematic diagram of the cross-sectional structure for implementing Example 3.

[0032] Figure 7 This is a schematic diagram of the cross-sectional structure of an outer conductor for implementing Example 1.

[0033] Figure 8This is a cross-sectional structural diagram of another implementation of Example 3. Detailed Implementation

[0034] To enable those skilled in the art to better understand and implement this patent, the markings in the accompanying drawings are explained in detail below.

[0035] In the diagram: 1—Inner conductor, 2—Insulation layer, 3—Shielding body, 4—Outer sheath, 5—Network cable body, 21—First insulator layer, 22—Second insulator layer, 23—Third insulator layer, 31—Outer conductor, 32—Shielding layer, 51—Network cable conductor, 52—Insulating sleeve, 310—Welding surface, 311—Outer groove, 312—Outer conductor inner cavity, 313—Inner groove, 314—Lower baseband, 315—Upper baseband, 31a—Left baseband, 31b—Right baseband, W1—Opening width of inner groove 313, W2—Bottom width of inner groove 313, 511—First side of network cable conductor, 512—Second side of network cable conductor, 212—Inner wall of the first insulator layer.

[0036] Implementation Example 1: Please see Figures 1 to 4 and Figure 7 A low-radiation coaxial cable comprises, from the inside out: an inner conductor 1, an insulation layer 2, a shielding body 3, and an outer sheath 4, and also has eight network cable sub-body 5. Each network cable sub-body 5 is composed of a network cable conductor 51 and an insulation sheath 52 covering the network cable conductor. The shielding body 3 is composed of an outer conductor 31 and a shielding layer 32, with the shielding layer 32 covering the insulation layer 2. The inner surface of the outer conductor 31 is tightly covered by the shielding layer 32. The inner wall of the outer conductor 31 has eight inner grooves 313 distributed circumferentially, each inner groove 313 containing a network cable sub-body 5. The outer wall of the outer conductor 31 has a circumferentially continuous outer groove 311.

[0037] The aforementioned low-radiation coaxial cable is preferably characterized in that: the cross-section of the inner groove 313 is a part of a fan-shaped annulus, and the cross-section of the insulating sleeve 52 is a part of a fan-shaped annulus that matches the cross-section of the inner groove 313; matching means that the insulating sleeve 52 can basically fill the inner groove 313.

[0038] The cross-section of the network cable conductor 51 can also be part of a fan-shaped ring. This flattens the network cable conductor and can cover the outer edge of the insulation layer 2 to the maximum extent. The network cable conductor 51 achieves the effect of further shielding the internal radiation of external electromagnetic signals, and at the same time, it achieves the effect of further shielding the external radiation of signals from the internal conductor.

[0039] Furthermore, the cross-section of the inner groove 313 and the insulating sleeve 52 can also be a structure in which the inner surface of the outer conductor 31 is the smallest and gradually increases from the inner surface of the outer conductor 31 to the outer surface of the outer conductor 31. This way, after the insulating sleeve 52 is placed into the inner groove 313, the insulating sleeve 52 cannot fall out of the inner groove 313, and when it is taken out, it is only necessary to slightly separate the opening of the inner groove 313.

[0040] Alternatively, the cross-section of the inner groove 313 can be of other shapes, and the cross-section of the insulating sleeve 52 can also be of other shapes, such as the commonly used circular conductor network cable body 5, as long as the insulating sleeve 52 can be fully inserted into the inner groove 313; other shapes may not have the same shielding effect as the preferred method, but they can still improve the shielding effect of the signal.

[0041] In this application, eight network cable sub-body 5 together constitute a network cable unit.

[0042] The shielding layer 32 can be aluminum foil, copper foil, woven steel wire mesh, woven copper wire mesh, etc., as long as it can provide electromagnetic shielding.

[0043] The shielding layer 32 covers the opening of the inner groove 313, forming a closed space together with the outer conductor 31. This provides better shielding for electromagnetic signals to the network cable sub-body 5 within the inner groove 313. This shielding eliminates the need for the network cable sub-body 5 to be twisted together, preventing crosstalk during signal transmission. Furthermore, it eliminates the need for untwisting during construction and for misaligning the blue and green wires during connection, thus improving construction efficiency, significantly enhancing connection quality, and reducing hand injuries to construction workers.

[0044] The term "circumferentially continuous" means that the outer groove 311 is continuous throughout the entire outer wall of the outer conductor 31 at 360 degrees. Moreover, the outer groove 311 can be distributed at intervals or in a spiral pattern along the extension direction of the outer conductor 31.

[0045] The aforementioned low-radiation coaxial cable has an outer conductor 31 that is a metal sheet with an approximately rectangular cross-section before forming. It is composed of a lower base strip 314, an upper base strip 315, a left base strip 31a, and a right base strip 31b. The outer conductor 31 is a single-piece structure. The upper base strips 315 are located above the lower base strips 314, and there are seven upper base strips 315. An inner groove 313 is located between adjacent upper base strips 315. The left base strip 31a is located above the left end of the lower base strip 314. There is an inner groove 313 between the left baseband 31a and the leftmost upper baseband 315. The right baseband 31b is located above the right end of the lower baseband 314. There is also an inner groove 313 between the right baseband 31b and the rightmost upper baseband 315. The bottom width W2 of the inner groove 313 is greater than the opening width W1 of the inner groove 313. The opening of the inner groove 313 is located on the upper surface of the outer conductor 31. The width gradually increases from the opening of the inner groove 313 to the bottom of the inner groove 313. Figure 7In the middle, the cross-section of the inner groove 313 is an isosceles trapezoid, and the left baseband 31a and the right baseband 31b can be spliced ​​together to form an upper baseband 315; the left surface of the left baseband 31a and the right surface of the right baseband 31b are both planes.

[0046] In the preferred embodiment of the low-radiation coaxial cable described above, the network cable body 5 is symmetrically and equally distributed around the circumference of the outer conductor 31.

[0047] The aforementioned low-radiation coaxial cable is manufactured by the following method:

[0048] Step 1: Continuously extend the inner conductor 1 forward, ensuring that the extended inner conductor 1 is straight before entering the extruder head;

[0049] Step 2: Inside and outside the extruder head, the insulating layer 2 is continuously wrapped around the inner conductor 1 to form an inner insulator. The inner insulator is continuously pulled through the extruder head, dried by the cooling water tank, and then pulled forward.

[0050] Step 3: Wrap the shielding layer 32 over the inner insulator to form a shielding insulator;

[0051] Step 4: Wrap the outer conductor 31 around the shielding insulator: During wrapping, the outer conductor 31 is wound to form an inner cavity 312 located inside, so that the shielding insulator is located inside the inner cavity 312, and the surface of the outer conductor 31, in which the network cable sub-body 5 is embedded, is in close contact with the shielding insulator, and the two ends of the outer conductor 31 are welded together to form a welding surface 310; thus forming the outer shielding body;

[0052] Step 5: Extrude the outer sheath 4 onto the outer shielding body to complete the manufacturing of the low-radiation coaxial cable.

[0053] In manufacturing the aforementioned low-radiation coaxial cable, before covering the outer conductor 31 onto the shielding insulator, the outer conductor 31 is first manufactured. The method for manufacturing the outer conductor 31 is as follows: a metal sheet with smooth upper and lower surfaces is continuously stretched through a corrugating mechanism or a grooving mechanism to form a metal sheet with an external groove on its surface. When the corrugating mechanism or grooving mechanism is a gear with closely opposing upper and lower parts, external grooves are formed on both the upper and lower surfaces of the metal sheet; when the upper part of the corrugating mechanism or grooving mechanism is a flat surface and the lower part is a gear, an external groove is formed on the lower surface of the metal sheet; before corrugating or grooving, a metal strip matching the shape of the internal groove is fixed at the corresponding position of the internal groove. When the metal sheet is pulled through the corrugating mechanism or grooving mechanism, the metal sheet can smoothly pass through the corrugating mechanism or grooving mechanism along the metal strip without flattening the metal sheet, and can smoothly form an external groove on the surface, ultimately forming the outer conductor.

[0054] Of course, in manufacturing the low-radiation coaxial cable described above, before corrugating or grooving, the network cable sub-body can be embedded into the inner groove first. In this way, due to the support of the network cable sub-body, when the metal sheet is pulled through the corrugating or grooving mechanism, the metal sheet can smoothly pass through the corrugating or grooving mechanism along the metal strip without flattening the metal sheet, and can smoothly form an outer groove on the surface, ultimately forming an outer conductor.

[0055] Implementation Example 2: Please see Figure 5 and refer to Figures 1 to 4 A low-radiation coaxial cable differs from Embodiment 1 in that: the shield 3 is composed only of the outer conductor 31, and the inner wall of the outer conductor 31 has no inner groove 313; the outer edge of the insulation layer 2 has eight grooves distributed circumferentially, each groove containing a network cable sub-body 5, and the outer conductor 31 covers the insulation layer 2 and the network cable sub-body 5; the network cable sub-body 5 also plays the role of improving shielding and reducing radiation.

[0056] Implementation Example 3: Please see Figure 6 and Figure 8 and refer to Figures 1 to 5 A low-radiation coaxial cable differs from Embodiment 2 in that: the insulation layer 2 is composed of a first insulator layer 21, a second insulator layer 22, and a third insulator layer 23 distributed sequentially from the outside to the inside; the outer edge of the first insulator layer 21 has four first grooves distributed circumferentially, each first groove containing a wire sub-body 5; the outer conductor 31 covers the first insulator layer 21 and the wire sub-body 5 in the first groove; the outer edge of the second insulator layer 22 has four second grooves distributed circumferentially, each second groove containing a wire sub-body 5; the first grooves of the first insulator layer 21 and the second grooves of the second insulator layer 22 are spatially staggered; the projection of all the first grooves and all the second grooves onto the center of the inner conductor can cover the entire circle, or even be larger than a circle.

[0057] As Figure 6 Taking a section of the first insulator layer 21 between the two first grooves above the first insulator layer 21 and a second groove directly below it as an example, the arc length of the outer edge of the second groove is not less than the arc length of the inner edge of the section of the first insulator layer 21, thus ensuring that it is not less than a circle, so that the network cable sub-body 5 can be fully shielded; the same applies to other places.

[0058] Figure 8The diagram only exemplarily illustrates relevant portions of two network cable sub-body above the first insulator layer 21 and one network cable sub-body above the second insulator layer 22; the other network cable sub-body components are essentially the same. The network conductor of the network cable sub-body in the first insulator layer 21 has a first side surface 511 and a second side surface 512. The axes of the first insulator layer, the second insulator layer, the third insulator layer, and the inner conductor coincide, referred to as the coincident axis. Both the first side surface 511 and the second side surface 512 of the network cable conductor are planar. The first side surface 511 and the second side surface 512 of the network cable conductor pass through the coincident axis. Figure 8 In the first insulator layer 21, the sides of the wire conductors of each wire sub-body, in a clockwise direction, are respectively referred to as the first side 511 and the second side 512 of the wire conductor. Between adjacent wire sub-body members within the first insulator layer 21, the second side 512 of the wire conductor of the first wire sub-body is located to the right of the corresponding first side 511 of the wire conductor in the lower second insulator layer 22, and the first side 511 of the wire conductor of the second wire sub-body is located to the right of the corresponding second side 511 of the wire conductor in the lower second insulator layer 22. On the left side of 512, this creates a situation where, on the projection of the inner wall 212 of the first insulator layer, the wire conductors in the first insulator layer 21 and the wire conductors in the second insulator layer 21 completely cover the inner wall 212 of the first insulator layer. In fact, the sum of the arc lengths of the inner walls of all the wire conductors in the first insulator layer 21 and the sum of the arc lengths of the inner walls of all the wire conductors in the second insulator layer 22 are not less than the perimeter of the inner wall 212 of the first insulator layer, i.e., at least a 360-degree full coverage, thus achieving a better shielding effect.

[0059] In this application, the increased shielding performance reduces radiation; compared to existing network cables, the shielding performance of the outer conductor is significantly improved, thus enhancing the shielding performance of the network cable, reducing radiation, and improving transmission performance; compared to existing coaxial cables, the network cable unit acts as a shield, significantly improving shielding performance.

[0060] In this application, even if the network conductor in the network cable sub-body does not completely cover all the gaps, it can still improve the shielding performance, but it is not an improvement in the shielding performance of the entire cross-section.

[0061] Compared with the prior art, the coaxial cable in this application has the following advantages:

[0062] 1. The same cable can be used not only as a traditional coaxial cable, but also as a network cable, reducing the cost of materials and construction.

[0063] 2. For home use, there is no need for separate installation. Junction boxes can be used as needed, and the site will look neat for any additional services added later.

[0064] 3. The network cable body does not need to be untwisted, as it is straight, making it easier and faster to connect RJ45 connectors and reducing the risk of injury to the operator's hands.

[0065] 4. The network cable itself is straight, which saves less length compared to twisted cable.

[0066] 5. The network cable components should be arranged according to the wiring sequence of the RJ45 connectors, and there is no need to cross them when wiring.

[0067] 6. The network cable has a 360-degree or higher circumferential coverage, which further shields electromagnetic signals.

[0068] 7. When a shielding layer is present, it achieves a further shielding effect on electromagnetic signals.

[0069] 8. For the network cable body, there may only be one shielding layer on the outside. However, in this application, the inner conductor, the possible outer shielding layer, and the outer conductor are more effectively shielded, resulting in more stable electrical network signal transmission.

[0070] 9. This application reduces the amount of materials used, thus meeting the requirements of green, low-carbon, and environmental protection. It saves resources and electricity, reduces energy consumption and costs, and is recyclable. It also improves construction and production efficiency and effectively reduces the impact of external electromagnetic noise.

[0071] This application has the following main beneficial technical effects: it is lower carbon footprint and more environmentally friendly, improves construction and production efficiency, and effectively reduces the impact of external electromagnetic noise.

[0072] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A low-radiation coaxial cable, comprising, from the inside out: an inner conductor (1), an insulation layer (2), a shield (3), and an outer sheath (4), characterized in that: Between the inner conductor (1) and the outer sheath (4), there is also a component to reduce the outward radiation of the inner conductor (1). The component to reduce the outward radiation of the inner conductor (1) includes a network cable unit. The network cable unit is composed of eight separate network cable sub-body (5). Each network cable sub-body (5) is composed of a network cable conductor (51) and an insulating sleeve (52) covering the network cable conductor. The shield (3) is composed of an outer conductor (31). The outer edge of the insulating layer (2) has eight grooves distributed circumferentially. Each groove contains a network cable sub-body (5). The outer conductor (31) covers the insulating layer (2) and the network cable sub-body (5). The outer wall of the outer conductor (31) has a circumferentially continuous outer groove (311).

2. A low-radiation coaxial cable, comprising, from the inside out: an inner conductor (1), an insulation layer (2), a shield (3), and an outer sheath (4), characterized in that: Between the inner conductor (1) and the outer sheath (4), there is also a component to reduce the outward radiation of the inner conductor (1). The component to reduce the outward radiation of the inner conductor (1) includes a network cable unit. The network cable unit is composed of eight separate network cable sub-bodies (5). Each network cable sub-bodies (5) consists of a network cable conductor (51) and an insulating sleeve (52) covering the network cable conductor. The shield (3) is composed of an outer conductor (31). The insulating layer (2) is composed of a first insulator layer (21), a second insulator layer (22), and a third insulator layer (23) distributed sequentially from the outside to the inside. The outer edge of the first insulator layer (21) has four circumferentially distributed... Each first groove has a network cable sub-body (5) inside. The outer conductor (31) covers the first insulator layer (21) and the network cable sub-body (5) inside the first groove. The outer edge of the second insulator layer (22) has four second grooves distributed circumferentially, each of which has a network cable sub-body (5). The first grooves of the first insulator layer (21) and the second grooves of the second insulator layer (22) are spatially staggered. The projection of all the first grooves and all the second grooves onto the center of the inner conductor can cover an area of ​​at least a whole circle. The outer wall of the outer conductor (31) has a circumferentially continuous outer groove (311).

3. A low-radiation coaxial cable according to claim 2, characterized in that: The shield (3) is composed of an outer conductor (31) and a shielding layer (32). The shielding layer (32) covers the outside of the insulating layer (2), and the inner surface of the outer conductor (31) is tightly covered by the shielding layer (32). The inner wall of the outer conductor (31) has eight inner grooves (313) distributed circumferentially. Each inner groove (313) has a network cable sub-body (5). The outer wall of the outer conductor (31) has an outer groove (311) that is circumferentially connected.

4. A low-radiation coaxial cable according to claim 3, characterized in that: On the cross-section of the inner groove (313) and the insulating sleeve (52), the size is smallest at the inner surface of the outer conductor (31), and the size gradually increases from the inner surface of the outer conductor (31) to the outer surface of the outer conductor (31).

5. A low-radiation coaxial cable according to claim 4, characterized in that: The cross-section of the inner groove (313) is part of a fan-shaped ring, and the cross-section of the insulating sleeve (52) is part of a fan-shaped ring that matches the cross-section of the inner groove (313); matching means that the insulating sleeve (52) can fill the inner groove (313).

6. A low-radiation coaxial cable according to claim 4, characterized in that: From the opening of the inner groove (313) to the bottom of the inner groove (313), the width gradually increases, and the cross-section of the inner groove (313) is an isosceles trapezoid.

7. A low-radiation coaxial cable according to claim 6, characterized in that: The shielding layer (32) covers the opening of the groove (313).

8. A low-radiation coaxial cable according to claim 7, characterized in that: The circumferential circulation refers to the fact that the outer groove (311) is circumferentially connected to the outer wall of the entire outer conductor (31) at 360 degrees; the outer groove (311) is distributed at intervals or in a spiral pattern along the extension direction of the outer conductor (31).

9. A method for manufacturing a low-radiation coaxial cable, wherein the low-radiation coaxial cable comprises, from the inside out: an inner conductor (1), an insulation layer (2), a shield (3), and an outer sheath (4), and also has eight network sub-body (5), each network sub-body (5) consisting of a network conductor (51) and an insulation sheath (52) covering the network conductor; the shield (3) consists of an outer conductor (31) and a shield (32), the shield (32) covering the insulation layer (2), and the inner surface of the outer conductor (31) tightly covering the insulation layer (2). Outside the shielding layer (32); the inner wall of the outer conductor (31) has eight circumferentially distributed inner grooves (313), each inner groove (313) containing a network cable sub-body (5), and the outer wall of the outer conductor (31) has a circumferentially continuous outer groove (311); the cross-section of the inner groove (313) is a part of a fan-shaped annulus, and the cross-section of the insulating sleeve (52) is a part of a fan-shaped annulus that matches the cross-section of the inner groove (313); matching means that the insulating sleeve (52) can fill the inner groove (313); characterized in that, The manufacturing method includes the following steps: Step 1: Continuously extend the inner conductor (1) forward, and ensure that the extended inner conductor (1) is straight before entering the extruder head; Step 2: Inside and outside the extruder head, the insulating layer (2) is continuously wrapped around the inner conductor (1) to form an inner insulator. The inner insulator is continuously pulled through the extruder head, dried after passing through the cooling water tank, and then pulled forward. Step 3: Cover the shielding layer (32) with the inner insulator to form a shielding insulator; Step 4: Before covering the outer conductor (31) onto the shielding insulator, the outer conductor (31) is manufactured. The method for manufacturing the outer conductor (31) is as follows: Take a metal sheet with smooth upper and lower surfaces and continuously stretch it through a corrugating mechanism or a grooving mechanism to form a metal sheet with an outer groove on the surface. When the corrugating mechanism or grooving mechanism is a gear with closely opposed upper and lower surfaces, an outer groove is formed on both the upper and lower surfaces of the metal sheet; when the upper part of the corrugating mechanism or grooving mechanism is a flat surface and the lower part is a gear, an outer groove is formed on the lower surface of the metal sheet; before corrugating or grooving, fix a metal strip that matches the shape of the inner groove at the corresponding position of the inner groove. When the material is drawn through the corrugating or grooving mechanism, it passes through the corrugating or grooving mechanism along the metal strip and forms an outer groove on the surface of the metal sheet, thus forming an outer conductor; the network cable sub-body is embedded in the inner groove, and then the outer conductor (31) is wrapped around the shielding insulator: during the wrapping, the outer conductor (31) is wound to form an inner cavity (312) located inside, so that the shielding insulator is located inside the inner cavity (312), and the surface of the outer conductor (31) with the network cable sub-body (5) embedded inside is in close contact with the shielding insulator, so that the two ends of the outer conductor (31) are welded to form a welding surface (310); thus forming an outer shielding body; Step 5: Extrude the outer sheath (4) onto the outer shielding body to complete the manufacturing of the low-radiation coaxial cable.

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