Cable and communication system

Abstract

The invention discloses a cable and a communication system, the cable comprises a coaxial line group and a first shielding layer, the coaxial line group comprises at least two coaxial lines, each coaxial line comprises a transmission core line and a second shielding layer, and the second shielding layer wraps the transmission core line; the first shielding layer wraps the coaxial line group. According to the scheme, the problem that the electrical performance of the cable is reduced due to deformation of the inner cavity of the cable in the related technology can be solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a cable and a communication system. Background Art

[0002] 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.

[0003] In the related art, the 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.

[0004] The above manufacturing process will result in greater coupling between the two transmission cores and a cavity inside the cable. When the inner sheath or shielding layer is squeezed, the cavity is more likely to deform, which in turn will easily lead to deterioration of the impedance and mode conversion of the cable, resulting in reduced electrical performance of the cable. Summary of the invention

[0005] The present application discloses a cable and a communication system to solve the problem in the related art that the electrical performance of the cable is reduced due to the deformation of the cavity inside the cable.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application discloses a cable, wherein the disclosed cable comprises: a coaxial line group and a first shielding layer, wherein:

[0008] The coaxial line group includes at least two coaxial lines, each of which includes a transmission core line and a second shielding layer, and the second shielding layer wraps the transmission core line;

[0009] The first shielding layer wraps the coaxial line group.

[0010] In a second aspect, an embodiment of the present application discloses a communication system, the disclosed communication system includes a first device, a second device and the cable described above;

[0011] The first device is electrically connected to the second device through the cable.

[0012] The technical solution adopted in this application can achieve the following technical effects:

[0013] The cable disclosed in the embodiment of the present application improves the related technology by wrapping the second shielding layer on each transmission core wire in the coaxial line group and wrapping the first shielding layer on the outside of the coaxial line group as a whole, so that each transmission core wire in the coaxial line group uses an independent second shielding layer as a shielding reference layer, and there is no coupling between the transmission core wires. The impedance and mode conversion of the cable are no longer affected by the cavity deformation formed by the coaxial line group and the first shielding layer, thereby improving the electrical performance of the cable; and the first shielding layer and the second shielding layer together form a double-layer shielding structure, which can also improve the shielding effect, further improving the transmission rate and stability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the first cable structure disclosed in the embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of the second cable structure disclosed in an embodiment of the present application.

[0016] Description of reference numerals:

[0017] 100-coaxial line group, 110-coaxial line, 111-transmission core line, 1111-center conductor, 1112-insulating layer, 112-second shielding layer, 113-ground line;

[0018] 200-first shielding layer;

[0019] 300-protective layer;

[0020] 400-Taping layer. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0022] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0023] The technical solutions disclosed in various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0024] Please refer to Figure 1 to Figure 2 , an embodiment of the present application discloses a cable, the disclosed cable includes a coaxial line group 100 and a first shielding layer 200, and 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 two or more coaxial lines 110 in the coaxial line group 100 are preferably arranged in parallel.

[0025] The first shielding layer 200 is wrapped around the outside of the coaxial cable group 100. On the one hand, the first shielding layer 200 can shield the signal outside the cable, thereby significantly improving the cable's anti-crosstalk capability; on the other hand, the first shielding layer 200 can be used to fix the coaxial cable group 100 to ensure the reliability of the cable. The first shielding layer 200 is a metal layer, which can be made of copper foil, aluminum foil, or aluminum foil Mylar.

[0026] Since there will be gaps between the coaxial lines 110 when they are arranged, a cavity will be formed between the inner wall of the first shielding layer 200 and the coaxial line 110 after the coaxial line group 100 is wrapped by the first shielding layer 200. The deformation of the cavity caused by the extrusion of the first shielding layer 200 will deteriorate the impedance and mode conversion of the coaxial line 110, and reduce the electrical performance of the cable, wherein the mode conversion refers to the conversion between differential mode signals and common mode signals. In view of the above problems, in an embodiment of the present application, each coaxial line 110 in the coaxial line group 100 includes a transmission core 111 and a second shielding layer 112, and 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.

[0027] It can be understood that each transmission core wire 111 in the coaxial line group 100 is wrapped with a second shielding layer 112 as a shielding reference layer, and the first shielding layer 200 is also wrapped as a whole on the outside of the coaxial line group 100, thereby forming a double-layer shielding structure. For each transmission core wire 111, there is an independent second shielding layer 112 as a shielding reference layer, and there is no coupling between the transmission core wires 111, which can reduce mutual interference. At the same time, due to the presence of the second shielding layer 112, the deformation of the cavity formed between the inner wall of the first shielding layer 200 and the coaxial line 110 will not affect the internal transmission core wire 111.

[0028] From the above, it can be known 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, and there is no coupling between the transmission core wires 111. 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.

[0029] The cable disclosed in the embodiment of the present application may further include a protective layer 300, such as Figure 1 and Figure 2 As shown, 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.

[0030] 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 is entirely wrapped around the outside of the second shielding layer 112, and the distribution of the protective layer 300 can also be discontinuous, such as only distributed in the gap between the overlapping area of ​​the first shielding layer 200 and the second shielding layer 112, or only distributed in the gap between adjacent second shielding layers 112. The thickness of the protective layer 300 can be selected according to the diameter of the cable and the size of the gap between the first shielding layer 200 and the second shielding layer 112, and the embodiment of the present application is not limited thereto.

[0031] The protective layer 300 can be made of a material with high strength and good bending resistance. By setting the protective layer 300 between the first shielding layer 200 and the second shielding layer 112, on the one hand, due to the filling effect of the protective layer 300, the second shielding layer 112 of the internal coaxial line 110 can be prevented from being damaged by extrusion and friction. On the other hand, during the winding process of the first shielding layer 200, the winding stress will cause periodic deformation on the outside of the second shielding layer 112, and the periodic deformation of the second shielding layer 112 will cause the internal transmission core 111 to produce insertion loss resonance points, affecting the data transmission performance. The protective layer 300 is supported between the first shielding layer 200 and the second shielding layer 112, which can offset part 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.

[0032] In an alternative solution, Figure 1 As shown, 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 outside the second shielding layer 112, and the cross-section is a concentric ring, the second shielding layer 112 is located inside the ring, and the protective layer 300 is located outside the ring.

[0033] Please refer again Figure 1 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, and the first shielding layer 200 is entirely wrapped outside the two protective layers 300. Since each second shielding layer 112 is wrapped with a protective layer 300, the peripheral 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.

[0034] In another optional solution, the protective layer 300 wraps the entire coaxial line group 100, and the positions of the coaxial lines 110 are relatively fixed and not prone to twisting, thereby improving the stability of the cable, simplifying the production process, and reducing production costs.

[0035] 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.

[0036] In a preferred solution, the protective layer 300 is made of an elastic material, specifically polyurethane (ThermoplasticUrethane, TPU), thermoplastic elastomer (Thermoplastic elastomer, TPE) and the like. The protective layer 300 is made of an elastic material. On the one hand, it can use its own elasticity to better offset the winding stress of the first shielding layer 200, thereby reducing the periodic deformation of the second shielding layer 112; on the other hand, it can also avoid damage caused by rigid contact friction between the coaxial lines 110, thereby improving the protection effect.

[0037] It should be noted that the protective layer 300 of elastic material can be wrapped separately outside the second shielding layer 112 and then wrapped by the first shielding layer 200, or it can be wrapped as a whole outside the coaxial line group 100 and then wrapped as a whole by the first shielding layer 200, or it can be only arranged in the gap in the overlapping area of ​​the first shielding layer 200 and the second shielding layer 112, or it can be only arranged in the gap between adjacent second shielding layers 112.

[0038] In the embodiments disclosed in this application, Figure 2 As shown, the coaxial line 110 further includes a ground wire 113, which is arranged in parallel with the transmission core wire 111 and is arranged outside the second shielding layer 112 to avoid interference with the transmission core wire 111. The ground wire 113 is wrapped by the protective layer 300, and during the use of the cable, the positions of the transmission core wire 111 and the ground wire 113 are more stable and not easy to twist and deform.

[0039] Regarding the way in which the protective layer 300 wraps the ground wire 113, in an optional manner, as Figure 2 As shown, 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.

[0040] 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.

[0041] It should be noted that in Figure 1In the solution without the ground wire 113 shown, the first shielding layer 200 or the second shielding layer 112 can be used to cooperate with the grounding terminal and the device end to achieve grounding.

[0042] Alternatively, if Figure 2 As shown, the coaxial line group 100 includes two coaxial lines 110 arranged in parallel, and the ground wire 113 corresponding to each coaxial line 110 is individually wrapped by the protective layer 300. Two cavities are distributed above and below one side of the two coaxial lines 110, and the two ground wires 113 are located on one side of the two coaxial lines 110 and arranged up and down, 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 lines 110, which is convenient for processing and improves processing efficiency.

[0043] In a further technical solution, the transmission core wire 111 includes a central conductor 1111 and an insulating layer 1112. The insulating layer 1112 wraps the central conductor 1111. The central conductor 1111 is used to transmit data, and the insulating layer 1112 is used to isolate the central conductor 1111 from the outside. The central conductor 1111 can be made of copper, silver, silver-plated copper and other materials. In consideration of the balance between performance and cost, silver-plated copper is used as the preferred material for the central conductor 1111. The thickness of the silver plating on the central conductor 1111 is 0.1-0.3 μm.

[0044] The insulating layer 1112 is made of fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE), polyethylene (PE) or other fluorinated materials having low dielectric constant and low dissipation factor.

[0045] 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 be used as a shielding reference layer for the center conductor 1111, so that the center conductors 1111 are not coupled with each other, 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.

[0046] Optionally, the cable disclosed in the embodiment of the present application may also include a tape layer 400, which is wrapped around the peripheral side of the first shielding layer 200 to play the role of heat insulation, corrosion resistance, and anti-aging, thereby protecting the internal structure of the cable and improving the strength and bending resistance of the cable. The tape layer 400 can be made of materials such as polyester resin (Polyethyleneterephthalate, PET), polyvinyl chloride (Polyvinyl chloride, PVC), and fabric, and can be wrapped around the peripheral side of the first shielding layer 200 in a Mylar winding manner. The number of tape layers 400 can be one layer, two layers, three layers or more, which can be selected according to the use scenario requirements of the cable, and the embodiment of the present application does not limit this.

[0047] Optionally, the first shielding layer 200 may be wrapped around the coaxial line group 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.

[0048] Specifically, the first shielding layer 200 can wrap the coaxial cable group 100 in a transverse wrapping manner, which can not only play a shielding role, but also improve the softness and bending resistance of the cable. The second shielding layer 112 can be longitudinally wrapped around the transmission core 111. Since the longitudinal wrapping method can reduce the periodic deformation of the second shielding layer 112, the transmission core 111 is prevented from generating an insertion loss resonance point, thereby ensuring the stability of cable data transmission.

[0049] 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.

[0050] The first device may be a printed circuit board (PCB) or a chip, and similarly, the second device may also be a printed circuit board or a chip. The first device and the second device are electrically connected via a cable to achieve data transmission. The specific connection method may be: the first device and the second device are both printed circuit boards, and the printed circuit boards are interconnected via connectors and cables; or the first device and the second device are both chips. It should be noted that the first device and the second device may be chips located on the same printed circuit board, and the chips are interconnected via cables and connectors.

[0051] 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 cavity deformation 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.

[0052] The above embodiments of the present 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.

[0053] 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 the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A cable, characterized in that: include: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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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