High-performance coaxial cable for vehicle-mounted communication system

Abstract

The invention discloses a high-performance coaxial cable for a vehicle-mounted communication system. The high-performance coaxial cable comprises a conductor, and an insulating layer, a metal belting layer, a braided shielding layer and a sheath layer which are sequentially coated on the outer layer of the conductor, the conductor is formed by twisting a plurality of monofilaments, each monofilament comprises a core layer and an outer layer, the core layer is graphene coated copper, and the outer layer is a pure copper coated layer; the insulating layer is made of polytetrafluoroethylene containing graphene; the metal belting layer is formed by covering a graphene layer on the surface of a copper layer; the braided shielding layer is made of graphene coated copper; and the sheath layer is made of a polyurethane material. According to the invention, the loss of high-frequency signals in the transmission process can be effectively reduced, and compared with the traditional copper / aluminum material, the shielding performance is more excellent.

Description

Technical Field

[0001] The present invention relates to the field of cable manufacturing, and in particular to a high-performance coaxial cable for a vehicle-mounted communication system. Background Art

[0002] Existing in-vehicle communication cables have many pain points that need to be addressed: First, pure copper conductors exhibit a significant skin effect under high-frequency conditions, especially when the frequency exceeds 1MHz, the resistance will increase sharply, which greatly limits its performance in high-frequency signal transmission. Second, traditional shielding materials (such as aluminum foil) are heavy and lack flexibility, which not only increases the burden on the entire vehicle, but also makes it difficult to adapt to the needs of complex wiring environments. In addition, in autonomous driving scenarios, the vehicle's sensitivity to electromagnetic interference (EMI) increases significantly, which places higher demands on the anti-interference capabilities of communication cables.

[0003] Graphene, a novel material with two-dimensional electron gas properties, shows promise in suppressing the skin effect. However, existing technologies face significant technical bottlenecks that require breakthroughs. First, the graphene-copper interface is susceptible to phonon scattering, which degrades electrical performance. Second, there is a lack of comprehensive composite material structures designed to fully exploit graphene's advantages for high-frequency signal transmission. These challenges pose numerous challenges to the practical application of graphene in automotive communication cables. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-performance coaxial cable for a vehicle-mounted communication system.

[0005] The present invention is achieved in that:

[0006] A high-performance coaxial cable for an on-board communication system comprises: a conductor, and an insulating layer, a metal tape layer, a braided shielding layer, and a sheath layer sequentially coated on the outer layer of the conductor; the conductor comprises a plurality of twisted monofilaments, each monofilament comprising a core layer and an outer layer, the core layer being graphene-clad copper, and the outer layer being a pure copper sheath; the insulating layer is polytetrafluoroethylene containing graphene; the metal tape layer is a copper layer covered with a graphene layer; the braided shielding layer is graphene-clad copper; and the sheath layer is a polyurethane material.

[0007] Furthermore, the conductor is formed by twisting 7 0.16 mm monofilaments, with a pitch of 10 mm and a diameter of 0.48 mm.

[0008] Furthermore, the thickness of the insulating layer is 0.48-0.55 mm, and the concentricity is greater than 95%.

[0009] Furthermore, the metal cladding layer has a thickness of 0.04 mm and a width of 7 mm.

[0010] Furthermore, the braided shielding layer is braided by 4 0.1 mm graphene-clad copper braids with a braiding density of 88%.

[0011] Furthermore, the thickness of the sheath layer is 0.25-0.35 mm, and the concentricity is greater than 85%.

[0012] The advantages of this invention include: it can effectively reduce the loss of high-frequency signals during transmission, and exhibits superior shielding performance compared to traditional copper / aluminum materials. At 10GHz, the cable's attenuation is only 3.2dB / m, approximately 52.9% lower than pure copper (6.8dB / m). At 1GHz, the cable's shielding attenuation exceeds 85dB, a 30.8% improvement over traditional copper / aluminum shielding (65dB), effectively protecting vehicles from electromagnetic interference (EMI) and the risk of information leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0015] Figure 2 It is an internal structure diagram of the present invention.

[0016] in:

[0017] 100. Cable; 1. Conductor; 2. Insulation layer; 3. Metal tape layer; 4. Braided shield layer; 5. Jacket layer. DETAILED DESCRIPTION

[0018] See also Figure 1 and Figure 2 As shown, a high-performance coaxial cable 100 for an in-vehicle communication system includes: a conductor 1, and an insulation layer 2, a metal tape layer 3, a braided shielding layer 4 and a sheath layer 5 sequentially coated on the outer layer of the conductor 1.

[0019] Conductor 1 is composed of multiple twisted monofilaments, each consisting of a core layer and an outer layer. The core layer is graphene-clad copper (GC-Cu), which is grown on a copper surface via plasma-assisted chemical vapor deposition (PECVD) to form atomic-level bonds. The outer layer is a pure copper cladding layer with a thickness of 3-10 μm, which reduces interfacial contact resistance and significantly reduces signal loss by more than 40% in high-frequency (1-10 GHz) transmission scenarios. The optimal number of monofilaments is 7, with a pitch of 10 ± 1 mm and a diameter of 0.48 mm.

[0020] The insulating layer 2 is made of polytetrafluoroethylene (PTFE), and the thickness of the insulating layer 2 is controlled between 0.48-0.55 mm, and the concentricity is greater than 95%. The insulating layer 2 can also be made of polytetrafluoroethylene doped with 0.1% graphene.

[0021] The metal tape layer 3 is graphene-coated copper with a thickness of 0.04 mm and a width of 7 mm.

[0022] The braided shield layer 4 is made of four 0.1mm graphene-coated copper braids with a braid density of 88% and a braid pitch of 16.2mm. This achieves a shielding effectiveness of 90dB or more in the 30 to 300MHz frequency band, while being 50% lighter than traditional copper braids.

[0023] The sheath layer 5 is made of polyurethane (TPU) material, has a thickness of 0.25-0.35 mm, and a concentricity greater than 85%.

[0024] The advantages of this invention include: it can effectively reduce the loss of high-frequency signals during transmission, and exhibits superior shielding performance compared to traditional copper / aluminum materials. At 10GHz, the cable's attenuation is only 3.2dB / m, approximately 52.9% lower than pure copper (6.8dB / m). At 1GHz, the cable's shielding attenuation exceeds 85dB, a 30.8% improvement over traditional copper / aluminum shielding (65dB), effectively protecting vehicles from electromagnetic interference (EMI) and the risk of information leakage.

[0025] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A high-performance coaxial cable for an in-vehicle communication system, characterized by: include: A conductor, and an insulation layer, a metal tape layer, a braided shield layer and a sheath layer sequentially coated on the outer layer of the conductor; The conductor is formed by twisting a plurality of monofilaments, each monofilament comprising a core layer and an outer layer, the core layer is graphene-coated copper, and the outer layer is a pure copper coating layer; The insulating layer is polytetrafluoroethylene; The metal cladding layer is a copper layer with a graphene layer covered on the surface; The braided shielding layer is graphene-clad copper; The sheath layer is made of polyurethane material.

2. A high-performance coaxial cable for an in-vehicle communication system according to claim 1, characterized in that: The conductor is formed by twisting 7 0.16 mm monofilaments, with a pitch of 10 mm and a diameter of 0.48 mm.

3. The high-performance coaxial cable for an in-vehicle communication system according to claim 1, wherein: The thickness of the insulating layer is 0.48-0.55 mm, and the concentricity is greater than 95%.

4. The high-performance coaxial cable for an in-vehicle communication system according to claim 1, wherein: The metal cladding layer has a thickness of 0.04 mm and a width of 7 mm.

5. The high-performance coaxial cable for an in-vehicle communication system according to claim 1, wherein: The braided shielding layer is formed by braiding four 0.1 mm graphene-clad copper strands, with a braiding density of 88%.

6. The high-performance coaxial cable for an in-vehicle communication system according to claim 1, characterized in that: The thickness of the sheath layer is 0.25-0.35 mm, and the concentricity is greater than 85%.

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