Cable and communication system

Abstract

Disclosed in the present application are a cable and a communication system. The disclosed cable comprises a coaxial wire group and a first shielding layer, wherein the coaxial wire group comprises at least two coaxial wires, of which each comprises a transmission core wire and a second shielding layer, the second shielding layer wrapping the transmission core wire, and the first shielding layer wraps the coaxial wire group.

Description

Cable and communication system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on August 4, 2023, with application number 202310986511.4 and invention name “A Cable and Communication System”. The entire contents of the Chinese patent application are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a cable and a communication system. Background Art

[0004] With the rapid development of communication technology, people's requirements for information transmission speed are getting higher and higher. Transmission cables have begun to attract widespread attention in the industry due to their low loss advantage.

[0005] In the related art, a transmission cable includes two parallel transmission core wires. The two transmission core wires are covered by an inner sheath layer and then wrapped as a whole by a shielding layer, or the two transmission core wires are directly wrapped as a whole by the shielding layer.

[0006] The aforementioned manufacturing process results in significant coupling between the two transmission cores and the creation of a cavity within the cable. When the inner sheath or shield is squeezed, the cavity is more likely to deform, which in turn can degrade the cable's impedance and mode conversion, ultimately reducing its electrical performance.

[0007] Summary of the Invention

[0008] In a first aspect, an embodiment of the present application discloses a cable, which includes: a coaxial line group and a first shielding layer, wherein: the coaxial line group includes at least two coaxial lines, each of the coaxial lines includes a transmission core wire and a second shielding layer, and the second shielding layer wraps the transmission core wire; the first shielding layer wraps the coaxial line group.

[0009] In a second aspect, an embodiment of the present application discloses a communication system, which includes a first device, a second device, and the cable described above; the first device is electrically connected to the second device via the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of a first cable structure disclosed in an embodiment of the present application;

[0011] FIG2 is a schematic diagram of a second cable structure disclosed in an embodiment of the present application.

[0012] Explanation of reference numerals: 100 - coaxial line group, 110 - coaxial line, 111 - transmission core line, 1111 - center conductor, 1112 - insulation layer, 112 - second shielding layer, 113 - ground line; 200 - first shielding layer; 300 - protective layer; 400 - tape layer. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0014] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0015] The technical solutions disclosed in various embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0016] Please refer to Figures 1 and 2. The embodiment of the present application discloses a cable, which includes a coaxial line group 100 and a first shielding layer 200. The coaxial line group 100 includes at least two coaxial lines 110. Among them, the coaxial line 110 is used to transmit high-speed or high-frequency data, and is widely used in the transmission of high-speed or high-frequency signals, and can meet the transmission rate requirements of 224Gbps and above. The number of coaxial lines 110 in the coaxial line group 100 can be two or more, and the specific number can be selected according to the actual data transmission requirements. It should be noted that the two or more coaxial lines 110 in the coaxial line group 100 are preferably arranged in parallel.

[0017] The first shielding layer 200 is entirely wrapped around the outside of the coaxial cable assembly 100. This shielding layer 200 not only shields signals outside the cable, significantly improving the cable's crosstalk resistance, but also secures the coaxial cable assembly 100, ensuring cable reliability. The first shielding layer 200 is a metal layer, specifically made of copper foil, aluminum foil, or aluminum foil Mylar.

[0018] Since there will be gaps between the coaxial cables 110 when they are arranged, a cavity will be formed between the inner wall of the first shielding layer 200 and the coaxial cable 110 after the coaxial cable group 100 is wrapped by the first shielding layer 200. The deformation of the cavity caused by the compression of the first shielding layer 200 will deteriorate the impedance and mode conversion of the coaxial cable 110, thereby reducing the electrical performance of the cable. Mode conversion refers to the conversion between differential mode signals and common mode signals. To address the above problems, in an embodiment of the present application, each coaxial cable 110 in the coaxial cable group 100 includes a transmission core 111 and a second shielding layer 112. The transmission core 111 is used to transmit high-frequency data. The second shielding layer 112 is wrapped around the outside of the transmission core 111 to shield the signal outside the transmission core 111. The second shielding layer 112 can be made of copper foil, aluminum foil, or aluminum foil Mylar.

[0019] It is understood that each transmission core 111 in the coaxial cable assembly 100 is wrapped with a second shielding layer 112 as a shielding reference layer, and the outer side of the coaxial cable assembly 100 is also entirely wrapped with a first shielding layer 200, thereby forming a double-layer shielding structure. Each transmission core 111 has an independent second shielding layer 112 as a shielding reference layer, eliminating coupling between the transmission cores 111 and reducing mutual interference. Furthermore, due to the presence of the second shielding layer 112, deformation of the cavity formed between the inner wall of the first shielding layer 200 and the coaxial cable 110 will not affect the transmission cores 111 within.

[0020] From the above, it can be seen that the cable disclosed in the embodiment of the present application improves the relevant technology. A second shielding layer 112 is wrapped around each transmission core wire 111 in the coaxial line group 100, and a first shielding layer 200 is wrapped around the outer side of the coaxial line group 100 as a whole, so that each transmission core wire 111 in the coaxial line group 100 uses an independent second shielding layer 112 as a shielding reference layer. There is no coupling between the transmission core wires 111, and the impedance and mode conversion of the cable are no longer affected by the deformation of the cavity formed by the coaxial line group 100 and the first shielding layer 200, thereby improving the electrical performance of the cable; and the first shielding layer 200 and the second shielding layer 112 together form a double-layer shielding structure, which can also improve the shielding effect, further improving the transmission rate and stability of the cable.

[0021] The cable disclosed in the embodiment of the present application may further include a protective layer 300. As shown in Figures 1 and 2, the protective layer 300 may be located between the first shielding layer 200 and the second shielding layer 112. The cross-sections of the first shielding layer 200 and the second shielding layer 112 may be circular or elliptical. Since two or more second shielding layers 112 are entirely wrapped by the first shielding layer 200, the outer side surface of each second shielding layer 112 is not completely in contact with the inner side surface of the first shielding layer 200. Therefore, the protective layer 300 is at least provided in the gap between the first shielding layer 200 and the second shielding layer 112, and is in contact with the first shielding layer 200 and the second shielding layer 112, respectively.

[0022] It should be noted that the distribution of the protective layer 300 between the first shielding layer 200 and the second shielding layer 112 can be continuous, such as the protective layer 300 being entirely wrapped around the outside of the second shielding layer 112. The distribution of the protective layer 300 can also be discontinuous, such as being distributed only in the gap between the overlapping region of the first shielding layer 200 and the second shielding layer 112, or only in the gap between adjacent second shielding layers 112. The thickness of the protective layer 300 can be selected based on the diameter of the cable and the size of the gap between the first shielding layer 200 and the second shielding layer 112, and is not limited in the embodiments of the present application.

[0023] The protective layer 300 can be made of a material with high strength and good bending resistance. By providing the protective layer 300 between the first shielding layer 200 and the second shielding layer 112, on the one hand, the filling effect of the protective layer 300 can prevent the second shielding layer 112 from being damaged by compression and friction on the internal coaxial line 110. On the other hand, during the winding process of the first shielding layer 200, the winding stress will cause periodic deformation of the outer side of the second shielding layer 112. The periodic deformation of the second shielding layer 112 will cause the internal transmission core 111 to produce insertion loss resonance points, affecting data transmission performance. The protective layer 300 is supported between the first shielding layer 200 and the second shielding layer 112, which can offset some of the winding stress, thereby reducing the insertion loss resonance points caused by the periodic deformation of the second shielding layer 112, thereby improving the data transmission performance of the cable.

[0024] In an optional solution, as shown in FIG1 , each second shielding layer 112 is wrapped with a protective layer 300. The cross-sections of the second shielding layer 112 and the protective layer 300 are both circular, and the protective layer 300 is wrapped around the second shielding layer 112, forming concentric rings in cross-section, with the second shielding layer 112 located on the inside of the rings and the protective layer 300 located on the outside of the rings.

[0025] Please refer to Figure 1 again. The coaxial cable group 100 includes two coaxial cables 110. Each coaxial cable 110 includes a transmission core wire 111, a second shielding layer 112, and a protective layer 300 arranged in sequence from the inside to the outside. The first shielding layer 200 is entirely wrapped around the two protective layers 300. Since each second shielding layer 112 is wrapped with a protective layer 300, the circumferential side surfaces of the second shielding layer 112 can be protected, further reducing the probability of damage to the second shielding layer 112. At the same time, the protective layer 300 can also better offset the winding stress of the first shielding layer 200, thereby reducing the insertion loss resonance point caused by the periodic deformation of the second shielding layer 112, thereby improving the data transmission performance of the cable. In addition, the protective layer 300 can also improve the strength and bending resistance of the cable, thereby improving the durability of the cable.

[0026] In another optional solution, the protective layer 300 completely wraps the coaxial cable group 100, and the positions of the coaxial cables 110 are relatively fixed and not prone to twisting, thereby improving the stability of the cable, simplifying the production process, and reducing production costs.

[0027] The first shielding layer 200 wraps around the circumferential side of the protective layer 300. The protective layer 300 has a good supporting effect on the first shielding layer 200 and can evenly offset the winding stress of the first shielding layer 200, thereby reducing the insertion loss resonance point caused by the periodic deformation of the second shielding layer 112, thereby improving the data transmission performance of the cable.

[0028] In a preferred embodiment, the protective layer 300 is made of an elastic material, specifically polyurethane (TPU), thermoplastic elastomer (TPE), or the like. Using an elastic material, the protective layer 300 can leverage its inherent elasticity to better offset the winding stress of the first shielding layer 200, thereby reducing the periodic deformation of the second shielding layer 112. Furthermore, it can prevent damage between the coaxial cables 110 caused by rigid contact friction, thereby enhancing the protective effect.

[0029] It should be noted that the protective layer 300 of elastic material can be wrapped around the second shielding layer 112 alone and then wrapped by the first shielding layer 200, or it can be wrapped around the coaxial cable group 100 as a whole and then wrapped by the first shielding layer 200 as a whole, or it can be set only in the gap in the overlapping area of ​​the first shielding layer 200 and the second shielding layer 112, or only in the gap between adjacent second shielding layers 112.

[0030] In the embodiment disclosed herein, as shown in FIG2 , the coaxial cable 110 further includes a ground wire 113, which is arranged parallel to the transmission core wire 111 and outside the second shielding layer 112 to prevent interference with the transmission core wire 111. The ground wire 113 is wrapped in a protective layer 300, which stabilizes the transmission core wire 111 and the ground wire 113 during use and prevents them from twisting or deforming.

[0031] Regarding the method of wrapping the ground wire 113 with the protective layer 300, in an optional method, as shown in Figure 2, the protective layer 300 separately wraps the second shielding layer 112 and the ground wire 113, and is then wrapped by the first shielding layer 200. The positions of the transmission core wire 111 and the ground wire 113 are relatively fixed and not prone to twisting, thereby improving the stability of the cable.

[0032] In another optional manner, the protective layer 300 is entirely wrapped around the coaxial line group 100 and then entirely wrapped by the first shielding layer 200 , which can also provide better protection while simplifying the production process and reducing production costs.

[0033] It should be noted that in the solution without the ground wire 113 shown in FIG. 1 , the first shielding layer 200 or the second shielding layer 112 can be used in conjunction with the grounding terminal and the device end to achieve grounding.

[0034] Optionally, as shown in FIG2 , the coaxial cable group 100 includes two parallel coaxial cables 110, and the ground wire 113 corresponding to each coaxial cable 110 is individually wrapped by a protective layer 300. Two cavities are distributed above and below one side of the two coaxial cables 110, and the two ground wires 113 are located on one side of the two coaxial cables 110 and arranged above and below, and are respectively arranged in the two cavities. On the one hand, the space inside the cable is reasonably utilized. On the other hand, due to the limiting effect of the cavity, the ground wire 113 can be prevented from twisting inside the cable, thereby improving the stability of the cable. In an optional solution, the two ground wires 113 can also be symmetrically distributed on both sides of the two coaxial cables 110, which facilitates processing and improves processing efficiency.

[0035] In a further technical solution, transmission core 111 includes a center conductor 1111 and an insulation layer 1112. Insulation layer 1112 wraps around center conductor 1111. Center conductor 1111 is used to transmit data, and insulation layer 1112 is used to isolate center conductor 1111 from the outside. Center conductor 1111 can be made of copper, silver, silver-plated copper, or other materials. Silver-plated copper is the preferred material for center conductor 1111 due to a balance between performance and cost. The thickness of the silver plating on center conductor 1111 is 0.1-0.3 μm.

[0036] The insulating layer 1112 is made of fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE), polyethylene (PE), or other fluorinated materials with low dielectric constant and low dissipation factor.

[0037] The second shielding layer 112 wraps around the circumferential side of the insulating layer 1112, thereby separating the center conductor 1111 and the insulating layer 1112 from the outside. The second shielding layer 112 can serve as a shielding reference layer for the center conductor 1111, so that the center conductors 1111 are not coupled with each other. The impedance and mode conversion of the cable are no longer affected by the deformation of the cavity formed by the coaxial cable group 100 and the first shielding layer 200, thereby improving the electrical performance of the cable.

[0038] Optionally, the cable disclosed in the embodiment of the present application may further include a tape layer 400, which is wrapped around the outer side of the first shielding layer 200 to provide heat insulation, corrosion resistance, and anti-aging properties, thereby protecting the internal structure of the cable while improving the strength and bending resistance of the cable. The tape layer 400 can be made of materials such as polyester resin (Polyethylene terephthalate, PET), polyvinyl chloride (Polyvinyl chloride, PVC), and fabric, and can be wrapped around the outer side of the first shielding layer 200 by Mylar winding. The number of tape layers 400 can be one, two, three, or more, and can be selected based on the specific usage scenario requirements of the cable, and the embodiment of the present application does not limit this.

[0039] Optionally, the first shielding layer 200 may be wrapped around the coaxial line assembly 100 in a transverse wrapping manner, and / or the second shielding layer 112 may be wrapped around the transmission core line 111 in a longitudinal wrapping manner.

[0040] Specifically, the first shielding layer 200 can be wrapped horizontally around the entire coaxial cable assembly 100, providing shielding while also enhancing the cable's flexibility and bending resistance. The second shielding layer 112 can be wrapped longitudinally around the transmission core 111. This longitudinal wrapping reduces periodic deformation of the second shielding layer 112, thereby preventing insertion loss resonance points on the transmission core 111 and ensuring stable data transmission over the cable.

[0041] Based on the cable disclosed in the embodiment of the present application, the embodiment of the present application discloses a communication system, which includes a first device, a second device and a cable. The cable involved is the cable described in the above embodiment, and the first device is electrically connected to the second device through the cable.

[0042] The first device can be a printed circuit board (PCB) or a chip. Similarly, the second device can also be a PCB or a chip. The first device and the second device are electrically connected via a cable to achieve data transmission. Specifically, the connection method can be: both the first device and the second device are PCBs, and the PCBs are interconnected via a connector and a cable; or both the first device and the second device are chips. It should be noted that the first device and the second device can be chips located on the same PCB, and the chips are interconnected via a cable and a connector.

[0043] Since the cable disclosed in the embodiment of the present application has a double-layer shielding structure formed by the first shielding layer 200 and the second shielding layer 112, the second shielding layer 112 independently wraps each transmission core wire 111 in the coaxial line group 100, and the outer side of the coaxial line group 100 wraps the first shielding layer 200 as a whole. There is no coupling between the transmission core wires 111, and the impedance and mode conversion of the cable are no longer affected by the deformation of the cavity formed by the coaxial line group 100 and the first shielding layer 200, thereby improving the electrical performance of the cable; and the double-layer shielding structure can also improve the shielding effect, thereby improving the rate and stability of data transmission between the first device and the second device.

[0044] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. Considering the simplicity of the text, they will not be repeated here.

[0045] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A cable, comprising: A coaxial line group (100) and a first shielding layer (200), wherein: The coaxial line group (100) comprises at least two coaxial lines (110), each of the coaxial lines (110) comprises a transmission core line (111) and a second shielding layer (112), and the second shielding layer (112) wraps the transmission core line (111); The first shielding layer (200) wraps the coaxial line group (100).

2. The cable according to claim 1, wherein: The cable further comprises a protective layer (300), wherein the protective layer (300) is located between the first shielding layer (200) and the second shielding layer (112), and is at least arranged in a gap between the first shielding layer (200) and the second shielding layer (112).

3. The cable according to claim 2, wherein: Each of the second shielding layers (112) is wrapped with the protective layer (300), and the first shielding layer (200) is wrapped outside the protective layer (300).

4. The cable according to claim 2, wherein: The protective layer (300) wraps the coaxial line group (100), and the first shielding layer (200) wraps the peripheral side surface of the protective layer (300).

5. The cable according to any one of claims 2 to 4, wherein: The protective layer (300) is made of elastic material and is elastically supported between the first shielding layer (200) and the second shielding layer (112).

6. The cable according to claim 3, wherein: The coaxial line (110) further comprises a ground line (113), wherein the ground line (113) is arranged outside the second shielding layer (112) and is wrapped by the protective layer (300).

7. The cable according to claim 6, wherein: The coaxial line group (100) comprises two coaxial lines (110) arranged in parallel, the ground line (113) corresponding to each coaxial line (110) is located on one side adjacent to the two coaxial lines (110), and the two ground lines (113) are arranged up and down.

8. The cable according to claim 1, wherein: The transmission core wire (111) comprises a central conductor (1111) and an insulating layer (1112), wherein the insulating layer (1112) wraps the central conductor (1111); The second shielding layer (112) wraps around the circumferential side of the insulating layer (1112).

9. The cable according to claim 1, wherein: The cable further comprises a tape layer (400), wherein the tape layer (400) is wrapped around the outer side surface of the first shielding layer (200).

10. The cable according to claim 1, wherein: The first shielding layer (200) is wrapped around the coaxial line group (100) in a transverse wrapping manner, and / or the second shielding layer (112) is wrapped around the transmission core line (111) in a longitudinal wrapping manner.

11. A communication system, comprising a first device, a second device and the cable according to any one of claims 1 to 10; The first device is electrically connected to the second device through the cable.

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