A signal transmission line

Abstract

The utility model relates to a kind of signal transmission lines, from inside to outside include conductive core, insulating cladding and shielding cladding in order, wherein, the conductive core includes the layered arrangement of several copper conductive layers and several conductive graphene layers.Copper conductive layer and conductive graphene layer are jointly as conductive core with the layered arrangement mode, this not only can improve the conductivity of conductive core, reduce the loss of conductive core in signal transmission process, and the negative influence to the tensile strength of conductive core is less, even can improve the tensile strength of conductive core.Thereby the comprehensive performance of signal transmission line can be further improved.

Description

Technical Field

[0001] This utility model relates to the field of signal transmission, and in particular to a signal transmission line. Background Technology

[0002] With the continuous development of information technology, the demand for long-distance signal transmission is increasing. As the main material carrier in the signal transmission process, the performance of the signal transmission line is crucial to the quality of signal transmission.

[0003] The main component of a signal transmission line for transmitting electrical signals is the conductive core. Copper is currently the primary material chosen for the conductive core because it not only has high electrical conductivity but also high tensile strength. Using copper as the conductive core material results in high overall performance for the signal transmission line.

[0004] As the requirements for signal transmission quality increase, the conductivity of the conductive core also needs to be further improved to reduce transmission loss. To this end, existing technologies have attempted to replace copper with other high-conductivity materials. However, increasing the conductivity of the conductive core by changing the material often leads to a decrease in the tensile strength of the conductive core, and the decrease in tensile strength is much greater than the increase in conductivity, resulting in a significant decline in the overall performance of the signal transmission line. Utility Model Content

[0005] Therefore, it is necessary to provide a signal transmission line that addresses the problem of the difficulty in further improving the overall performance of signal transmission lines.

[0006] A signal transmission line comprises, from the inside out, a conductive core, an insulating cladding, and a shielding cladding, wherein the conductive core comprises a plurality of copper conductive layers and a plurality of conductive graphene layers arranged in layers.

[0007] In some embodiments, at least a portion of the copper conductive layer is covered on both sides with the conductive graphene layer.

[0008] In some embodiments, at least a portion of the conductive graphene layer is grown on the copper conductive layer by chemical vapor deposition.

[0009] In some embodiments, there are at least two copper conductive layers, and at least one conductive graphene layer is disposed between two adjacent copper conductive layers.

[0010] In some embodiments, two conductive graphene layers are disposed between two adjacent copper conductive layers, the thickness of a single conductive graphene layer is 0.34nm-0.68nm, the thickness of a single copper conductive layer is 4.5μm-5μm, and the number of copper conductive layers is 90-110.

[0011] In some embodiments, only one conductive graphene layer is disposed between two adjacent copper conductive layers, the thickness of a single conductive graphene layer is 2.72nm-3.06nm, the thickness of a single copper conductive layer is 85μm-95μm, and the number of copper conductive layers is 40-60 layers.

[0012] In some embodiments, the thickness of a single copper conductive layer is 4.5 μm-95 μm, and the thickness of a single conductive graphene layer is 0.34 nm-3.06 nm.

[0013] In some embodiments, the thickness of the conductive core is 0.1 mm to 10 mm.

[0014] In some embodiments, a portion of the copper conductive layer is connected to the conductive graphene layer by vacuum hot pressing sintering; and / or

[0015] The number of conductive graphene layers is at least two, and at least two of the conductive graphene layers are bonded together and connected by vacuum hot pressing sintering.

[0016] In some embodiments, the shielding cladding comprises, from the inside out, an outer liner, an aluminum foil layer, and a copper wire braided layer, and the signal transmission line further includes a protective layer covering the outside of the copper wire braided layer.

[0017] In some embodiments, the thickness of the insulating cladding is 0.05mm-1mm, and the material of the insulating cladding is polyimide, HDPE, FEP, or PTFE.

[0018] In some embodiments, the outer liner has a thickness of 0.005mm-0.5mm, the aluminum foil layer has a thickness of 0.01mm-0.1mm, the copper wire braid layer has a thickness of 0.01mm-0.5mm, and the protective layer has a thickness of 0.1mm-1.5mm.

[0019] In some embodiments, the outer liner is made of glass fiber or polyimide.

[0020] In some embodiments, the protective layer is made of PVC, TPU, nylon, PTFE, RF-35, or RF-60.

[0021] The beneficial effects of this utility model are as follows:

[0022] The copper conductive layer and the conductive graphene layer are arranged in a layered manner to serve as the conductive core. This not only improves the conductivity of the conductive core and reduces losses during signal transmission, but also has a minimal negative impact on the tensile strength of the conductive core, and may even improve it. This results in a further improvement in the overall performance of the signal transmission line.

[0023] The signal transmission line of this invention further includes an insulating cladding and a shielding cladding on the outside of the conductive core. The insulating cladding provides electrical isolation to the conductive core, reducing signal leakage and interference, and improving signal transmission stability. The shielding cladding shields the signal, prevents crosstalk, and also protects both the conductive core and the insulating cladding. Attached Figure Description

[0024] Figure 1 This is a schematic cross-sectional view of the signal transmission line in an embodiment of this utility model;

[0025] Figure 2 This is one arrangement of the copper conductive layer and the conductive graphene layer in the embodiments of this utility model;

[0026] Figure 3 This is one arrangement of the copper conductive layer and the conductive graphene layer in the embodiments of this utility model;

[0027] Figure 4 This is one arrangement of the copper conductive layer and the conductive graphene layer in the embodiments of this utility model;

[0028] Figure 5 This is one arrangement of the copper conductive layer and the conductive graphene layer in the embodiments of this utility model;

[0029] Figure 6 This is one arrangement of the copper conductive layer and the conductive graphene layer in the embodiments of this utility model.

[0030] Figure label:

[0031] 1. Conductive core; 11. Copper conductive layer; 12. Conductive graphene layer; 2. Insulating cladding; 3. Shielding cladding; 31. Outer lining layer; 32. Aluminum foil layer; 33. Copper wire braided layer; 4. Protective layer. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] like Figure 1 As shown, this application embodiment first provides a signal transmission line, which includes a conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4 from the inside out.

[0038] The conductive core 1 serves as the signal transmission layer; the insulating sheath 2 provides electrical isolation for the conductive core 1, thereby reducing signal leakage and interference and improving signal transmission stability; the shielding sheath 3 provides signal shielding and prevents crosstalk, while also protecting the conductive core 1 and the insulating sheath 2; the protective layer 4 provides waterproofing and insulation, protecting the conductive core 1, the insulating sheath 2, and the shielding sheath 3. In addition, the protective layer 4 ensures the overall tensile strength of the signal transmission line.

[0039] Preferably, the thickness of the insulating cladding 2 is 0.05mm-1mm, and the material of the insulating cladding 2 is polyimide, HDPE, FEP or PTFE.

[0040] Preferably, the thickness of the protective layer 4 is 0.1-1.5mm, and the material of the protective layer 4 is PVC, TPU, nylon, PTFE, RF-35 or RF-60.

[0041] As an example, the shielding cladding 3 includes, from the inside out, an outer liner 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0042] The outer liner 31 not only serves as a signal shield, improving signal transmission quality and efficiency, but also protects the conductive core 1. Preferably, the thickness of the outer liner 31 is 0.005mm-0.5mm, and the material of the outer liner 31 is glass fiber or polyimide.

[0043] The aluminum foil layer 32 serves to shield high-frequency signals and reduce crosstalk. Preferably, the thickness of the aluminum foil layer 32 is 0.01mm-0.1mm. The copper wire braided layer 33 also serves to shield signals; preferably, the thickness of the copper wire braided layer 33 is 0.01mm-0.5mm. The combination of the aluminum foil layer 32 and the copper wire braided layer 33 for signal shielding can appropriately balance the material cost of the shielding cladding layer 3.

[0044] Unlike existing technologies, the conductive core 1 in this application is not made solely of copper, but comprises several copper conductive layers 11 and several conductive graphene layers 12 arranged in layers. The overall thickness of the conductive core 1 can be, for example, 0.1 mm to 10 mm, the thickness of a single copper conductive layer 11 can be, for example, 4.5 μm to 95 μm, and the thickness of a single conductive graphene layer 12 can be, for example, 0.34 nm to 3.06 nm.

[0045] The specific layered arrangement of the copper conductive layer 11 and the conductive graphene layer 12 includes, but is not limited to, the following: Figures 2-6 As shown in the diagram.

[0046] like Figure 2As shown, in some embodiments, there is one copper conductive layer 11 and one conductive graphene layer 12, with the conductive graphene layer 12 attached to the upper surface of the copper conductive layer 11. The conductive graphene layer 12 can be prepared by spraying a graphene dispersion onto the surface of the copper conductive layer 11 and then drying it, or it can be prepared on the surface of the copper conductive layer 11 by chemical vapor deposition.

[0047] Since copper has catalytic activity for the growth of graphene, when the conductive graphene layer 12 is grown on the copper conductive layer 11 by chemical vapor deposition, the connection strength and connection stability between the conductive graphene layer 12 and the copper conductive layer 11 can be fully guaranteed, thereby reducing the contact resistance between the conductive graphene layer 12 and the copper conductive layer 11.

[0048] Furthermore, the excellent conductivity of the conductive graphene layer 12 further enhances the conductivity of the conductive core 1, especially its conductivity during high-frequency signal transmission. Based on this, the stacked combination of the copper conductive layer 11 and the conductive graphene layer 12 reduces the transmission loss and Joule heating of the conductive core 1, enhances the signal transmission integrity of the conductive core 1, and increases its signal transmission distance. Moreover, the excellent thermal conductivity of the conductive graphene layer 12 enhances the heat dissipation capacity of the conductive core 1, helping to reduce the increased resistance of the conductive core 1 due to temperature rise.

[0049] In some embodiments, Figure 2 The structure shown can be used directly as conductive core 1. In other embodiments, Figure 2 The structure shown can also serve as the first repeating unit.

[0050] like Figure 3 As shown, in some embodiments, there is one copper conductive layer 11 and two conductive graphene layers 12, with the two conductive graphene layers 12 respectively disposed on both sides of the copper conductive layer 11.

[0051] In some embodiments, Figure 3 The structure shown can be used directly as conductive core 1. In other embodiments, Figure 3 The structure shown can also serve as a second repeating unit.

[0052] With the copper conductive layer 11 and the conductive graphene layer 12 having a fixed thickness, the second repeating unit has a higher graphene content than the first repeating unit because both sides of the copper conductive layer 11 are used to set the conductive graphene layer 12. Therefore, the conductivity and thermal conductivity of the second repeating unit are further improved compared to the first repeating unit.

[0053] like Figure 4As shown, in some embodiments, there are at least two copper conductive layers 11 and at least two conductive graphene layers 12, and the copper conductive layers 11 and conductive graphene layers 12 are arranged alternately. That is, a conductive graphene layer 12 is disposed between two adjacent copper conductive layers 11, and a copper conductive layer 11 is disposed between two adjacent conductive graphene layers 12.

[0054] Preferred, in Figure 4 In the layered structure shown, the top and bottom layers are both conductive graphene layers 12, in order to maximize the graphene content in the layered structure. Figure 4 The structure shown can be obtained, for example, by hot pressing a second repeating unit with several first repeating units.

[0055] like Figure 5 As shown, in some embodiments, there are at least two copper conductive layers 11 and at least two conductive graphene layers 12, wherein the copper conductive layers 11 are spaced apart, and two conductive graphene layers 12 are disposed between two adjacent copper conductive layers 11.

[0056] Preferred, in Figure 5 In the layered structure shown, both the top and bottom layers are conductive graphene layers 12 to maximize the graphene content in the layered structure. It is easy to understand that with a fixed number of copper conductive layers 11, a fixed thickness of copper conductive layers 11, and a fixed thickness of conductive graphene layers 12... Figure 5 The layered structure shown is compared to Figure 4 As shown in the layered structure, the graphene content is higher, resulting in superior electrical and thermal conductivity. Figure 5 The scheme shown can be obtained, for example, by vacuum hot pressing sintering two second repeating unit layers.

[0057] Since the growth of the conductive graphene layer 12 depends on the copper conductive layer 11, there can generally be at most two conductive graphene layers 12 between two adjacent copper conductive layers 11. These two conductive graphene layers 12 can be connected, for example, by vacuum hot pressing sintering.

[0058] like Figure 6 As shown, in some embodiments, there are two copper conductive layers 11 and two conductive graphene layers 12. The two copper conductive layers 11 are bonded together and located between the two conductive graphene layers 12.

[0059] As can be seen from the above example, the cross-sectional shape of the conductive core 1 in this application is generally square.

[0060] Example 1:

[0061] This embodiment provides a signal transmission line, which, from the inside out, includes a conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4. The shielding cladding 3, from the inside out, includes an outer sheath 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0062] The conductive core 1 has a thickness of approximately 0.485 mm, the insulating layer 2 has a thickness of 0.05 mm and is made of FEP, the outer liner 31 has a thickness of 0.01 mm and is made of polyimide, the aluminum foil layer 32 has a thickness of 0.01 mm, the copper wire braided layer 33 has a thickness of 0.01 mm, and the protective layer 4 has a thickness of 0.5 mm and is made of RF-35.

[0063] The specific preparation method of the conductive core 1 in this embodiment is as follows: a copper foil with a thickness of 5 μm (i.e. a single copper conductive layer 11) is used as a growth substrate, and graphene is grown on both sides by chemical vapor deposition to obtain a second repeating unit; 100 second repeating units are stacked and placed in a mold for vacuum hot pressing sintering. After vacuum hot pressing sintering, the thickness of a single copper conductive layer 11 is about 4.85 μm.

[0064] The chemical vapor deposition process in this embodiment is a prior art technique, and the specific steps are as follows: After placing the copper foil into the growth chamber, the growth chamber is evacuated, and then argon and hydrogen are introduced, with the argon flow rate at 10 sccm and the hydrogen flow rate at 100 sccm. The chamber is then evacuated again to a vacuum level of 0.1 Pa, followed by the introduction of methane at a flow rate of 100 sccm for graphene growth over a period of 30 minutes. The final graphene thickness is 0.34 nm–0.68 nm.

[0065] Comparative Example 1:

[0066] This comparative example provides a signal transmission line, which, from the inside out, includes a cylindrical conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4. The shielding cladding 3, from the inside out, includes an outer sheath 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0067] The conductive core 1 has a radius of approximately 0.485 mm, the insulating layer 2 has a thickness of 0.05 mm and is made of FEP, the outer liner 31 has a thickness of 0.01 mm and is made of polyimide, the aluminum foil layer 32 has a thickness of 0.01 mm, the copper wire braided layer 33 has a thickness of 0.01 mm, and the protective layer 4 has a thickness of 0.5 mm and is made of RF-35.

[0068] The specific preparation method of the conductive core 1 of this comparative example is as follows: using a 5μm thick copper foil as a growth substrate, graphene is grown on both sides by chemical vapor deposition to obtain a second repeating unit; the second repeating unit is wound 100 times and then placed in a mold for drawing and annealing to obtain the conductive core 1 of this comparative example 1.

[0069] The comparative chemical vapor deposition process is as follows: After the copper foil is placed in the growth chamber, the chamber is evacuated, and then argon and hydrogen are introduced, with an argon flow rate of 10 sccm and a hydrogen flow rate of 100 sccm. The chamber is then evacuated again to a vacuum level of 0.1 Pa, followed by the introduction of methane at a flow rate of 100 sccm for graphene growth over a period of 30 minutes. The final graphene thickness is 0.34 nm–0.68 nm.

[0070] Example 2:

[0071] This embodiment provides a signal transmission line, which, from the inside out, includes a conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4. The shielding cladding 3, from the inside out, includes an outer sheath 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0072] The conductive core 1 has a thickness of approximately 1.9 mm, the insulating layer 2 has a thickness of 0.1 mm and is made of PTFE, the outer liner 31 has a thickness of 0.02 mm and is made of fiberglass, the aluminum foil layer 32 has a thickness of 0.02 mm, the copper wire braided layer 33 has a thickness of 0.02 mm, and the protective layer 4 has a thickness of 1 mm and is made of PVC.

[0073] The specific preparation method of the conductive core 1 in this embodiment is as follows: a copper foil with a thickness of 25 μm (i.e., a single copper conductive layer 11) is used as a growth substrate, and graphene is grown on both sides by chemical vapor deposition to obtain a second repeating unit; 80 second repeating units are stacked and placed in a mold for vacuum hot pressing sintering. After vacuum hot pressing sintering, the thickness of a single copper conductive layer 11 is about 23.75 μm.

[0074] The chemical vapor deposition process in this embodiment is as follows: After the copper foil is placed in the growth chamber, the growth chamber is evacuated, and then nitrogen and hydrogen are introduced, with a nitrogen flow rate of 50 sccm and a hydrogen flow rate of 300 sccm. The chamber is then evacuated again to a vacuum level of 0.1 Pa. Methane is then introduced to grow graphene at a flow rate of 300 sccm for 20 minutes. The final graphene thickness is 0.34 nm–0.68 nm.

[0075] Example 3:

[0076] This embodiment provides a signal transmission line, which, from the inside out, includes a conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4. The shielding cladding 3, from the inside out, includes an outer sheath 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0077] The conductive core 1 has a thickness of approximately 0.93 mm, the insulating layer 2 has a thickness of 0.5 mm and is made of HDPE, the outer liner 31 has a thickness of 0.2 mm and is made of polyimide, the aluminum foil layer 32 has a thickness of 0.05 mm, the copper wire braided layer 33 has a thickness of 0.1 mm, and the protective layer 4 has a thickness of 0.8 mm and is made of TPU.

[0078] The specific preparation method of the conductive core 1 in this embodiment is as follows: a copper foil with a thickness of 50 μm (i.e., a single copper conductive layer 11) is used as a growth substrate, and graphene is grown on both sides by chemical vapor deposition to obtain a second repeating unit; 20 second repeating units are stacked and placed in a mold for vacuum hot pressing sintering. After vacuum hot pressing sintering, the thickness of a single copper conductive layer 11 is about 46.5 μm.

[0079] The chemical vapor deposition process in this embodiment is as follows: After the copper foil is placed in the growth chamber, the growth chamber is evacuated, and then nitrogen and hydrogen are introduced, with a nitrogen flow rate of 500 sccm and a hydrogen flow rate of 1000 sccm. The chamber is then evacuated again to a vacuum level of 0.1 Pa. Methane is then introduced to grow graphene at a flow rate of 1000 sccm for 50 minutes. The final graphene thickness is 1.36 nm–1.7 nm.

[0080] Example 4:

[0081] This embodiment provides a signal transmission line, which, from the inside out, includes a conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4. The shielding cladding 3, from the inside out, includes an outer sheath 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0082] The conductive core 1 has a thickness of approximately 4.5 mm, the insulating layer 2 has a thickness of 0.8 mm and is made of PTFE, the outer liner 31 has a thickness of 0.05 mm and is made of polyimide, the aluminum foil layer 32 has a thickness of 0.03 mm, the copper wire braided layer 33 has a thickness of 0.03 mm, and the protective layer 4 has a thickness of 1.2 mm and is made of RF-60.

[0083] The specific preparation method of the conductive core 1 in this embodiment is as follows: A graphene dispersion is prepared and loaded into a spraying device. A 100μm thick copper foil (i.e., a single copper conductive layer 11) is sprayed and dried on one side to obtain a first repeating unit, wherein the graphene thickness is 2.72nm-3.06nm. Fifty first repeating units are stacked and then hot-rolled, with the deformation controlled at 10%, and the graphene thickness is negligible. After hot rolling, the thickness of a single copper conductive layer 11 is approximately 90μm.

[0084] Comparative Example 2:

[0085] This comparative example provides a signal transmission line, which, from the inside out, includes a conductive core 1, an insulating cladding 2, a shielding cladding 3, and a protective layer 4. The shielding cladding 3, from the inside out, includes an outer sheath 31, an aluminum foil layer 32, and a copper wire braided layer 33.

[0086] The conductive core 1 has a thickness of 4.5 mm, the insulating layer 2 has a thickness of 0.8 mm and is made of PTFE, the outer liner 31 has a thickness of 0.05 mm and is made of polyimide, the aluminum foil layer 32 has a thickness of 0.03 mm, the copper wire braided layer 33 has a thickness of 0.03 mm, and the protective layer 4 has a thickness of 1.2 mm and is made of RF-60.

[0087] The specific preparation method of the conductive core 1 in this comparative example is as follows: 50 copper foils with a thickness of 100 micrometers are stacked and hot-rolled.

[0088] The test data for conductive core 1 in Examples 1-4 and Comparative Examples 1-2 are shown in Table 1. The conductivity tests in Table 1 were conducted according to T / CSTM 00591 2022; the tensile strength tests were conducted according to GB / T228-2002. IACS refers to the International Annealed Copper Standard, a conductivity benchmark standard established by the International Electrotechnical Commission (IEC). It uses the resistivity of annealed high-purity copper (99.9995%) at 20°C as a benchmark of 0.017241 Ω·mm² / m, corresponding to a conductivity of 100%. The conductivity of other materials is obtained as a percentage by comparing it to this benchmark. For example, if a material has a conductivity of 100% IACS, it means that its conductivity is the same as that of annealed copper.

[0089] Table 1

[0090] Test serial number Conductivity / IASC% Tensile strength / MPa Example 1 112 215 Comparative Example 1 103 180 Example 2 110 218 Example 3 109 221 Example 4 108 227 Comparative Example 2 99 224

[0091] As shown in Table 1, the conductivity of conductive core 1 in Examples 1-4 is higher than that in Comparative Example 2, with an improvement of approximately 10%. This fully demonstrates the effect of conductive graphene layer 12 on improving the conductivity of conductive core 1. On the other hand, although the tensile strength of conductive core 1 in Examples 1-3 is lower than that in Comparative Example 2, it is only about 4% lower. In Example 4, the tensile strength of conductive core 1 is even higher than that in Comparative Example 2. This fully demonstrates that the layered design of conductive graphene layer 12 and copper conductive layer 11 results in a conductivity improvement effect of conductive core 1 that far outweighs the reduction in tensile strength. This fully demonstrates that conductive graphene layer 12 can improve the overall performance of conductive core 1.

[0092] One important reason why the overall performance of conductive core 1 can be improved in Examples 1-4 is that during the vacuum hot pressing sintering or vacuum hot rolling process, metallurgical bonding and grain growth occur inside and between the first repeating unit, or inside and between the second repeating unit.

[0093] On the other hand, compared to Comparative Example 2, the conductive graphene layer 12 only improved the conductivity of the conductive core 1 by about 4%, while the tensile strength decreased by about 20%. In other words, the overall performance of the conductive core 1 in Comparative Example 1 was significantly lower than that in Comparative Example 2. The reason for this is that the second repeating unit is formed by winding the conductive core 1, resulting in poor internal density of the conductive core 1.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A signal transmission line, characterized in that, From the inside out, it includes a conductive core (1), an insulating cladding (2), and a shielding cladding (3). The conductive core (1) includes a plurality of copper conductive layers (11) and a plurality of conductive graphene layers (12) arranged in layers.

2. The signal transmission line according to claim 1, characterized in that, At least a portion of the copper conductive layer (11) is covered on both sides by the conductive graphene layer (12).

3. The signal transmission line according to claim 1, characterized in that, At least a portion of the conductive graphene layer (12) is grown on the copper conductive layer (11) by chemical vapor deposition.

4. The signal transmission line according to claim 1, characterized in that, The number of copper conductive layers (11) is at least two, and at least one conductive graphene layer (12) is disposed between two adjacent copper conductive layers (11).

5. The signal transmission line according to claim 4, characterized in that, Two conductive graphene layers (12) are disposed between two adjacent copper conductive layers (11). The thickness of a single conductive graphene layer (12) is 0.34nm-0.68nm, the thickness of a single copper conductive layer (11) is 4.5μm-5μm, and the number of copper conductive layers (11) is 90-110.

6. The signal transmission line according to claim 4, characterized in that, Only one conductive graphene layer (12) is provided between two adjacent copper conductive layers (11). The thickness of a single conductive graphene layer (12) is 2.72nm-3.06nm, the thickness of a single copper conductive layer (11) is 85μm-95μm, and the number of copper conductive layers (11) is 40-60 layers.

7. The signal transmission line according to claim 1, characterized in that, The thickness of a single copper conductive layer (11) is 4.5μm-95μm, and the thickness of a single conductive graphene layer (12) is 0.34nm-3.06nm.

8. The signal transmission line according to claim 7, characterized in that, The thickness of the conductive core (1) is 0.1mm-10mm.

9. The signal transmission line according to claim 1, characterized in that, Part of the copper conductive layer (11) is connected to the conductive graphene layer (12) by vacuum hot pressing sintering; and / or The number of conductive graphene layers (12) is at least two, and at least two of the conductive graphene layers (12) are bonded together and connected by vacuum hot pressing sintering.

10. The signal transmission line according to any one of claims 1-9, characterized in that, The shielding cladding (3) includes, from the inside out, an outer liner (31), an aluminum foil layer (32), and a copper wire braided layer (33). The signal transmission line also includes a protective layer (4) covering the outside of the copper wire braided layer (33).

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