Flat configuration high speed transmission line for space applications

Abstract

The application discloses a kind of flat configuration high-speed transmission lines for spaceflight, belong to wire and cable technical field.The transmission line of the application is composed of core transmission layer, insulating layer, shielding protection layer, braiding layer and outer sheath layer;The core transmission layer is composed of two-core signal conductor and two-core ground wire;The insulating layer is PTFE microporous tape wrapping layer and outer PTFE raw material tape coating layer;Shielding protection layer is PI aluminum film pressure-sensitive adhesive tape wrapping layer;Outer sheath is modified ETFE material.The application is integrated with low dielectric constant insulating layer by flat braiding configuration, which guarantees the low attenuation transmission of high-frequency signal of 224 / 448Gbps data transmission order of magnitude, and greatly reduces the volume and bending radius of cable, which is convenient for high-density laying of spacecraft;At the same time, the modified ETFE sheath and PI shielding layer make the cable have excellent high-low temperature resistance, strong ionizing radiation resistance and vacuum stability, which meets the stringent requirements of space environment.

Description

Technical Field

[0001] This invention belongs to the field of wire and cable technology, specifically relating to a flat high-speed transmission line for aerospace applications. Background Technology

[0002] As global space exploration continues to deepen and spacecraft functions become increasingly complex, the demand for data transmission rates and bandwidth in space missions is experiencing unprecedented exponential growth. In recent years, emerging application scenarios, such as space AI computing networks, high-resolution Earth observation, real-time image transmission from deep space exploration, and interplanetary laser communication links, have placed demands on ultra-high-speed signal transmission at levels of 224Gbps and even 448Gbps for space high-speed interconnect technologies.

[0003] Taking the Starlink V3 third-generation satellite constellation as an example, it has achieved 100Gbps-level laser link transmission. However, for future higher-level applications such as orbital data centers and space edge computing, data exchange between on-orbit computing nodes urgently requires high-speed transmission cables with higher bandwidth, lower latency, and the ability to adapt to extreme space environments as the physical layer support. However, the inherent special characteristics of the space environment constitute the primary obstacle to the deployment of high-speed transmission technology. Traditional commercial high-speed transmission lines, especially the 224G / 448G-level high-speed copper cables developed in recent years for ground data centers and high-speed network equipment, have achieved high levels in signal transmission rate and attenuation control. However, their insulation materials (usually foamed polyethylene or ordinary fluoroplastics) and sheath layers must withstand high vacuum environments, intense thermal cycling, and strong ionizing radiation caused by high-energy cosmic rays and solar proton events for extended periods during spacecraft operation in orbit, leading to material performance degradation. These environmental factors pose severe challenges to the material system, structural stability, and electrical performance maintenance capabilities of transmission cables.

[0004] On the other hand, while traditional aerospace transmission lines offer some environmental resistance, they mostly employ a circular cross-section design. When laid in confined spaces such as spacecraft cabin layers and instrument panel gaps, circular cables not only occupy a large volume but also have a bending radius limited by the wire diameter, making high-density cabling difficult and hindering the overall lightweighting and miniaturization goals of spacecraft. More critically, existing aerospace-grade cables are mostly designed for low-frequency signal transmission or power delivery below 100 Mbps. Their insulation systems have high dielectric constants and loss factors, exhibiting significant attenuation characteristics during high-frequency signal transmission, making them unsuitable for low-distortion transmission of 224 / 448 Gbps ultra-high-speed data. Therefore, there is an urgent need to invent a transmission line that simultaneously integrates ultra-high-speed signal transmission capabilities, a flat and compact structure, and aerospace-grade environmentally resistant materials. This would address core issues such as high-speed signal attenuation, poor environmental adaptability, and low space utilization in space AI computing networks, supporting efficient interconnection in scenarios such as orbital data centers and deep space probes. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flat high-speed transmission line for aerospace applications.

[0006] The objective of this invention can be achieved through the following technical solutions: A high-speed transmission line with a flat configuration for aerospace applications, comprising a core transmission layer, an insulation layer, a shielding layer, a braided layer, and an outer sheath layer.

[0007] As a further technical solution, the core transmission layer is composed of two signal conductors and two ground wires, and the materials of the signal conductors and ground wires are both silver-plated copper foil stranded conductors.

[0008] As a further technical solution, the insulating layer includes an inner layer of polytetrafluoroethylene (PTFE) microporous tape wrapping layer and an outer layer of PTFE raw material tape covering layer.

[0009] As a further technical solution, the shielding protective layer is a single-sided polyimide (PI) aluminum film pressure-sensitive adhesive tape wrapping layer.

[0010] As a further technical solution, the single-sided polyimide aluminum film pressure-sensitive tape includes a polyimide substrate, an aluminum film layer, and a pressure-sensitive adhesive layer.

[0011] As a further technical solution, the braided layer is formed by horizontally weaving and binding silver-plated copper foil wires.

[0012] As a further technical solution, the outer sheath layer is a modified ETFE sheath, the material of which is prepared through the following steps: A1. Place nano-cerium oxide and nano-silica in a mixer, add an ethanol-water solution containing a coupling agent (ethanol to water volume ratio of 9:1), stir continuously at 50-60℃ for 40-60 min to allow the coupling agent to be fully hydrolyzed and coated on the surface of the nanoparticles, and vacuum dry to obtain dry filler. A2. Add the ethylene-tetrafluoroethylene copolymer, dry filler, crosslinking sensitizer, modifier, antioxidant and lubricant to a high-speed mixer and mix for 15-25 minutes to obtain the mixture; A3. The mixture is fed into a twin-screw extruder for melt blending and granulation to obtain the material for the outer sheath layer.

[0013] As a further technical solution, the raw materials are as follows by weight: 80-90 parts ethylene-tetrafluoroethylene copolymer, 6-10 parts nano cerium oxide, 5-8 parts nano silica, 5-8 parts crosslinking sensitizer, 2-4 parts modifier, 1.2-1.6 parts antioxidant, 0.8-1.2 parts lubricant and 0.5-1 parts coupling agent.

[0014] As a further technical solution, the antioxidant is one of antioxidant 1010, antioxidant 3114 and antioxidant 2246.

[0015] As a further technical solution, the lubricant is one of calcium stearate, zinc stearate, and magnesium stearate.

[0016] As a further technical solution, the high-speed mixer rotates at a speed of 800-1000 rpm.

[0017] As a further technical solution, the modifier is prepared through the following steps: B1. Add pentamethylpiperidinol and dichloromethane to a three-necked round-bottom flask (equipped with a magnetic stirrer and a constant-pressure dropping funnel). Place the flask in an ice-water bath (0-5℃) and stir until completely dissolved. Purge with nitrogen as a protective gas. Then add triethylamine first, and then dissolve allylmethyldichlorosilane in dichloromethane. Using a constant-pressure dropping funnel, slowly add the solution dropwise to the flask while stirring. After the addition is complete, remove the ice-water bath and heat in an oil bath to 40-45℃. Stir and react for 4-6 hours. After the reaction is complete, follow the post-processing steps to obtain the intermediate of the modifier. B2. In a three-necked round-bottom flask (equipped with a magnetic stirrer, a constant-pressure dropping funnel, and a reflux condenser), add 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole, 4-dimethylaminopyridine (catalyst), and acetonitrile. Start stirring and purge with nitrogen as a protective gas. Add triethylamine to the flask, then dissolve the intermediate of the modifier in acetonitrile and add it dropwise to the flask using a constant-pressure dropping funnel. After the addition is complete, heat the flask in an oil bath to 80-82°C and reflux with stirring for 12-16 hours. After the reaction is complete, follow the post-processing steps to obtain the modifier.

[0018] As a further technical solution, the ratio of pentamethylpiperidinol to allylmethyldichlorosilane in step B1 is 17.1g:18.3-18.9g.

[0019] As a further technical solution, in step B2, the ratio of the amount of 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole to the intermediate of the modifier is 25.2g:63.1-64.2g.

[0020] This invention first involves a nucleophilic substitution reaction between allylmethyldichlorosilane and pentamethylpiperidinol, utilizing steric hindrance and dropwise control to achieve monosubstituted selectivity. For this purpose, allylmethyldichlorosilane needs to be in excess. Secondly, the above intermediate is reacted with 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole, controlling the molar ratio of the two to be close to 2:1, with the intermediate in slight excess, so that the reaction proceeds towards disubstituted products, reducing monosubstituted byproducts.

[0021]

[0022] As can be seen from the above-mentioned reaction formula, firstly, the oxadiazole heterocyclic group in the modifier molecule has a highly conjugated nitrogen-rich heterocyclic structure with extremely high delocalization energy, exhibiting significant resistance to electron beam and proton irradiation, protecting the ETFE backbone from irradiation damage; secondly, the hindered amine in the modifier molecule can efficiently capture the active free radicals generated by ETFE during high-energy ray irradiation (space environment) and high-temperature extrusion, interrupting the oxidation chain reaction and further improving the radiation resistance of the matrix; moreover, the Si-O bond energy in the modifier molecule is much higher than that of the C-C bond, and the introduction of this structural unit significantly improves the high-temperature decomposition resistance of the modifier itself and the cross-linked system, ensuring that the sheath maintains structural integrity during extreme thermal cycling; finally, the two allyl double bonds at both ends of the modifier molecule can participate in the cross-linking network between ETFE molecular chains in the subsequent irradiation process and be fixed inside the three-dimensional network through chemical bonding, solving the problem of easy oil release or volatilization of traditional small molecule additives in vacuum environment and improving stability.

[0023] The beneficial effects of this invention are: 1. This invention uses a two-core signal conductor and a two-core ground wire as the core, combined with a PTFE low dielectric constant composite insulation layer, to effectively ensure low attenuation and low distortion transmission of high-frequency signals with a data transmission speed of 224 / 448Gbps; 2. Abandoning the traditional circular cross-section, it adopts an integrated flat braided structure, which significantly reduces the cable volume and bending radius, making it easy to lay in high density in the confined space of spacecraft; 3. By modifying the ETFE sheath material (introducing specific modifiers containing oxadiazole, hindered amines and Si-O bonds and nano-cerium oxide) and combining it with the PI aluminum film shielding layer, the cable has excellent resistance to high and low temperature alternation, resistance to strong ionizing radiation and vacuum stability, which solves the problems of easy aging and volatilization of traditional materials in orbit and ensures long-term reliability. In summary, this invention achieves low-attenuation transmission of ultra-high-speed signals while simultaneously meeting the stringent requirements of aerospace environments for compact cabling and extreme tolerance, thus possessing significant application value in the field of wire and cable technology. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention; in the figure: 1, signal conductor, 2, polytetrafluoroethylene microporous tape wrapping layer, 3, polytetrafluoroethylene raw material tape wrapping layer, 4, shielding protection layer, 5, ground wire, 6, silver-plated copper foil braided layer, 7, outer sheath layer. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1 Preparation of modifiers: B1. Add 51.3g of pentamethylpiperidinol and 150mL of dichloromethane to a three-necked round-bottom flask (equipped with a magnetic stirrer and a constant-pressure dropping funnel). Place the flask in an ice-water bath (0-5℃) and stir until completely dissolved. Purge with nitrogen as a protective gas. Then add 30.3g of triethylamine, followed by dissolving 54.9g of allylmethyldichlorosilane in 100mL of dichloromethane. Using a constant-pressure dropping funnel, slowly add the solution dropwise to the flask while stirring. After the addition is complete, remove the ice-water bath and heat the mixture in an oil bath to 40℃. Stir and react for 4 hours. After the reaction is complete, filter the reaction solution. Remove most of the solvent from the filtrate by rotary evaporation. Purify the solution by silica gel column chromatography (eluent: petroleum ether / ethyl acetate = 5:1). Remove the eluent by rotary evaporation to obtain the intermediate of the modifier. B2. In a three-necked round-bottom flask (equipped with a magnetic stirrer, a constant-pressure dropping funnel, and a reflux condenser), add 25.2 g of 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole, 1.2 g of 4-dimethylaminopyridine, and 100 mL of acetonitrile. Start stirring and purge with nitrogen as a protective gas. Add 21.2 g of triethylamine to the flask, then dissolve 63.1 g of the intermediate of the modifier in 150 mL of acetonitrile and add it dropwise to the flask using a constant-pressure dropping funnel. After the addition is complete, heat the flask to 80 °C in an oil bath and reflux with stirring for 12 h. After the reaction is complete, filter the reaction solution and remove most of the solvent by rotary evaporation. Purify the solution by silica gel column chromatography (eluent: petroleum ether / ethyl acetate = 10:1), remove the eluent by rotary evaporation, and obtain the modifier.

[0028] Preparation of outer sheath material: A1. Place 6 parts of nano-cerium oxide and 5 parts of nano-silica in a mixer, add 30 parts of an ethanol aqueous solution containing 0.5 parts of coupling agent KH-550 (ethanol to water volume ratio of 9:1), stir continuously at 50℃ for 40 min to allow the coupling agent to be fully hydrolyzed and coated on the surface of the nanoparticles, and vacuum dry at 80℃ to obtain the dry filler. A2. Add 80 parts of ethylene-tetrafluoroethylene copolymer, dry filler, 5 parts of triallyl isocyanurate, 2 parts of modifier, 1.2 parts of antioxidant 1010 and 0.8 parts of zinc stearate to a high-speed mixer and mix at 800 rpm for 15 min to obtain a mixture. A3. The mixture is fed into a twin-screw extruder for melt blending and granulation to obtain the material for the outer sheath layer.

[0029] Reference Figure 1 This invention discloses a high-speed transmission line with a flat configuration for aerospace applications, which is manufactured through the following steps: C1. An oxygen-free copper foil wire (0.10 mm in diameter) is electroplated to deposit a silver plating layer on its surface. The silver plating layer is 3 μm thick. Then, seven silver-plated copper foil wires are stranded together in the same direction (S-direction, with a stranding pitch controlled at 8 times the diameter of the single wire, i.e., a pitch of 8) using a stranding machine to form a stranded signal conductor 1. The ground wire 5 is made of the same material and using the same stranding process as the signal conductor 1 to form a stranded ground wire 5. The signal conductor 1 and the ground wire 5 are used as the core transmission layer. C2. Polytetrafluoroethylene (PTFE) microporous tape is spirally wrapped around the surface of signal conductor 1 to form PTFE microporous tape wrapping layer 2. The dielectric constant of the microporous tape is 1.5, the dielectric loss factor is 0.0015, and the microporosity is 60%. Then, PTFE raw material tape is spirally wrapped around the outside of PTFE microporous tape wrapping layer 2 in the same direction to form PTFE raw material tape wrapping layer 3. C3. On the surface of the polytetrafluoroethylene raw material tape wrapping layer 3, a shielding protective layer 4 is wrapped in a spiral manner to obtain an insulated wire core. The shielding protective layer 4 is a single-sided PI aluminum film pressure-sensitive tape (including polyimide substrate, aluminum film layer and pressure-sensitive adhesive layer). C4. On the outside of the shielding layer 4, the aforementioned insulated wire core and ground wire 5 are arranged parallel and spaced along the flat direction and fed into a flat braiding machine. Silver-plated copper foil wire (single wire diameter 0.05mm) is used as the braiding flat wire. The insulated wire core and ground wire 5 are integrated and fixed by the flat braiding machine (braiding angle is set to 45°, braiding density ≥85%), so that the two are combined into a flat integrated structure, that is, forming the silver-plated copper foil wire braided layer 6. C5. On the surface of the silver-plated copper foil braided layer 6, the material covering the outer sheath layer is extruded through an extruder to form the outer sheath layer 7. Then, segmented water cooling is used (the first segment is at a water temperature of 60°C, and the second segment is at room temperature) to obtain a semi-finished cable. C6. The semi-finished cable is cross-linked by electron beam irradiation with an irradiation dose of 120 kGy and an accelerator energy of 2.5 MeV. After cross-linking, a high-speed transmission line with a flat configuration for aerospace applications is obtained.

[0030] Example 2 Preparation of modifiers: B1. Add 51.3g of pentamethylpiperidinol and 150mL of dichloromethane to a three-necked round-bottom flask (equipped with a magnetic stirrer and a constant-pressure dropping funnel). Place the flask in an ice-water bath (0-5℃) and stir until completely dissolved. Purge with nitrogen as a protective gas. Then add 30.3g of triethylamine, followed by dissolving 56.7g of allylmethyldichlorosilane in 100mL of dichloromethane. Using a constant-pressure dropping funnel, slowly add the solution dropwise to the flask while stirring. After the addition is complete, remove the ice-water bath and heat the mixture in an oil bath to 45℃. Stir and react for 6 hours. After the reaction is complete, filter the reaction solution. Remove most of the solvent from the filtrate by rotary evaporation. Purify the solution by silica gel column chromatography (eluent: petroleum ether / ethyl acetate = 5:1). Remove the eluent by rotary evaporation to obtain the intermediate of the modifier. B2. In a three-necked round-bottom flask (equipped with a magnetic stirrer, a constant-pressure dropping funnel, and a reflux condenser), add 25.2 g of 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole, 1.2 g of 4-dimethylaminopyridine, and 100 mL of acetonitrile. Start stirring and purge with nitrogen as a protective gas. Add 21.2 g of triethylamine to the flask, then dissolve 64.2 g of the intermediate of the modifier in 150 mL of acetonitrile and add it dropwise to the flask using a constant-pressure dropping funnel. After the addition is complete, heat the flask to 82 °C in an oil bath and reflux with stirring for 16 h. After the reaction is complete, filter the reaction solution and remove most of the solvent by rotary evaporation. Purify the solution by silica gel column chromatography (eluent: petroleum ether / ethyl acetate = 10:1), remove the eluent by rotary evaporation, and obtain the modifier.

[0031] Preparation of outer sheath material: A1. Place 8 parts of nano-cerium oxide and 6.5 parts of nano-silica in a mixer, add 30 parts of an ethanol-water solution containing 0.75 parts of coupling agent KH-550 (ethanol to water volume ratio of 9:1), stir continuously at 60℃ for 60 min to allow the coupling agent to be fully hydrolyzed and coated on the surface of the nanoparticles, and vacuum dry at 80℃ to obtain the dry filler. A2. Add 85 parts of ethylene-tetrafluoroethylene copolymer, dry filler, 6.5 parts of triallyl isocyanurate, 3 parts of modifier, 1.4 parts of antioxidant 3114 and 1.0 parts of magnesium stearate to a high-speed mixer and mix at 1000 rpm for 25 min to obtain a mixture. A3. The mixture is fed into a twin-screw extruder for melt blending and granulation to obtain the material for the outer sheath layer.

[0032] Reference Figure 1 This invention discloses a high-speed transmission line with a flat configuration for aerospace applications, which is manufactured through the following steps: C1. An oxygen-free copper foil wire (0.10 mm in diameter) is electroplated to deposit a silver plating layer on its surface. The silver plating layer is 3 μm thick. Then, seven silver-plated copper foil wires are stranded together in the same direction (S-direction, with a stranding pitch controlled at 8 times the diameter of the single wire, i.e., a pitch of 8) using a stranding machine to form a stranded signal conductor 1. The ground wire 5 is made of the same material and using the same stranding process as the signal conductor 1 to form a stranded ground wire 5. The signal conductor 1 and the ground wire 5 are used as the core transmission layer. C2. Polytetrafluoroethylene (PTFE) microporous tape is spirally wrapped around the surface of signal conductor 1 to form PTFE microporous tape wrapping layer 2. The dielectric constant of the microporous tape is 1.5, the dielectric loss factor is 0.0015, and the microporosity is 60%. Then, PTFE raw material tape is spirally wrapped around the outside of PTFE microporous tape wrapping layer 2 in the same direction to form PTFE raw material tape wrapping layer 3. C3. On the surface of the polytetrafluoroethylene raw material tape wrapping layer 3, a shielding protective layer 4 is wrapped in a spiral manner to obtain an insulated wire core. The shielding protective layer 4 is a single-sided PI aluminum film pressure-sensitive tape (including polyimide substrate, aluminum film layer and pressure-sensitive adhesive layer). C4. On the outside of the shielding layer 4, the aforementioned insulated wire core and ground wire 5 are arranged parallel and spaced along the flat direction and fed into a flat braiding machine. Silver-plated copper foil wire (single wire diameter 0.05mm) is used as the braiding flat wire. The insulated wire core and ground wire 5 are integrated and fixed by the flat braiding machine (braiding angle is set to 45°, braiding density ≥85%), so that the two are combined into a flat integrated structure, that is, forming the silver-plated copper foil wire braided layer 6. C5. On the surface of the silver-plated copper foil braided layer 6, the material covering the outer sheath layer is extruded through an extruder to form the outer sheath layer 7. Then, segmented water cooling is used (the first segment is at 80°C and the second segment is at room temperature) to obtain a semi-finished cable. C6. The semi-finished cable is cross-linked by electron beam irradiation with an irradiation dose of 120 kGy and an accelerator energy of 2.5 MeV. After cross-linking, a high-speed transmission line with a flat configuration for aerospace applications is obtained.

[0033] Example 3 The only difference between this embodiment and Embodiment 1 is that, in this embodiment, the outer sheath material is prepared through the following steps: A1. Place 10 parts of nano-cerium oxide and 8 parts of nano-silica in a mixer, add 30 parts of an ethanol aqueous solution containing 1 part of coupling agent KH-550 (ethanol to water volume ratio is 9:1), stir continuously at 60℃ for 60 min to allow the coupling agent to be fully hydrolyzed and coated on the surface of the nanoparticles, and vacuum dry at 80℃ to obtain dry filler. A2. Add 90 parts of ethylene-tetrafluoroethylene copolymer, dry filler, 8 parts of triallyl isocyanurate, 4 parts of modifier, 1.6 parts of antioxidant 2246 and 1.2 parts of calcium stearate to a high-speed mixer and mix at 1000 rpm for 25 min to obtain a mixture. A3. The mixture is fed into a twin-screw extruder for melt blending and granulation to obtain the material for the outer sheath layer. Using this material for the outer sheath layer, a high-speed transmission line with a flat configuration for aerospace applications is manufactured using the same steps as in Example 1.

[0034] Comparative Example 1 The only difference between this comparative example and Example 1 is that, in this comparative example, an equal amount of Tinuvin 765 was used to replace the modifier to prepare the transmission line.

[0035] Comparative Example 2 The only difference between this comparative example and Comparative Example 1 is that in this comparative example, nano-cerium oxide is not added to obtain the transmission line.

[0036] The transmission lines prepared in Examples 1, 2, and 3, and Comparative Examples 1 and 2, were subjected to high-frequency insertion loss (50 GHz) measured and calculated using a vector network analyzer. The measurement results are shown in Table 1. Table 1

[0037] The materials of the outer sheath layers prepared in Examples 1, 2, and 3, and Comparative Examples 1 and 2, were subjected to the following performance tests: The tensile strength of the specimens was determined according to GB / T 1040.1-2025 standard. The total vacuum mass loss was determined using the QJ 1558B-2016 standard. Electron beam irradiation was used with a total dose of 200 kGy and an accelerator of 2.5 MeV; the tensile strength retention rate after irradiation was measured. High and low temperature cycle test: The temperature was lowered from -100℃ liquid nitrogen to 150℃, with each cycle lasting 8 hours and 100 cycles; the tensile strength retention rate was measured after the cycle. The measurement results are shown in Table 2: Table 2

[0038] As shown in Tables 1 and 2, the transmission line manufactured in this embodiment of the invention achieves low-attenuation transmission of ultra-high-speed signals, exhibiting excellent performance and good stability. Therefore, this invention has significant application value in the field of wire and cable technology.

[0039] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A high-speed transmission line with a flat configuration for aerospace applications, comprising a core transmission layer, an insulation layer, a shielding layer, a braided layer, and an outer sheath layer, characterized in that, The outer sheath layer comprises the following raw materials in parts by weight: 80-90 parts ethylene-tetrafluoroethylene copolymer, 6-10 parts nano-cerium oxide, 5-8 parts nano-silica, 5-8 parts crosslinking sensitizer, 2-4 parts modifier, 1.2-1.6 parts antioxidant, 0.8-1.2 parts lubricant, and 0.5-1 part coupling agent.

2. The aerospace-grade flat high-speed transmission line according to claim 1, characterized in that, The modifier is prepared by the following steps: B1. Add pentamethylpiperidinol and dichloromethane to a flask, then place the flask in an ice-water bath and stir until completely dissolved. Pour nitrogen gas through the flask. Then add triethylamine first, and then dissolve allylmethyldichlorosilane in dichloromethane and add it dropwise to the flask. After the addition is complete, remove the ice-water bath, heat the oil bath to 40-45°C, and stir the reaction for 4-6 hours. When the reaction is complete, the intermediate of the modifier is obtained. B2. In a flask, add 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole, 4-dimethylaminopyridine, and acetonitrile. Start stirring and purge with nitrogen. Add triethylamine to the flask, then dissolve the intermediate of the modifier in acetonitrile and add it dropwise to the flask. After the addition is complete, heat in an oil bath to 80-82°C and reflux with stirring for 12-16 hours. Once the reaction is complete, the modifier is obtained.

3. A high-speed transmission line with a flat configuration for aerospace applications according to claim 2, characterized in that, In step B1, the ratio of pentamethylpiperidinol to allylmethyldichlorosilane is 17.1 g: 18.3-18.9 g.

4. A high-speed transmission line with a flat configuration for aerospace applications according to claim 2, characterized in that, In step B2, the ratio of the amount of 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole to the intermediate of the modifier is 25.2 g: 63.1-64.2 g.

5. A high-speed transmission line with a flat configuration for aerospace applications according to claim 1, characterized in that, The core transmission layer consists of two signal conductors and two ground wires.

6. A high-speed transmission line with a flat configuration for aerospace applications according to claim 1, characterized in that, The insulating layer comprises an inner layer of polytetrafluoroethylene microporous tape wrapping and an outer layer of polytetrafluoroethylene raw material tape covering.

7. A high-speed transmission line with a flat configuration for aerospace applications according to claim 1, characterized in that, The shielding and protective layer is a single-sided polyimide aluminum film pressure-sensitive tape wrapping layer.

8. A high-speed transmission line with a flat configuration for aerospace applications according to claim 1, characterized in that, The antioxidant is one of antioxidant 1010, antioxidant 3114 and antioxidant 2246.

9. A high-speed transmission line with a flat configuration for aerospace applications according to claim 1, characterized in that, The lubricant is one of calcium stearate, zinc stearate, and magnesium stearate.

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