A high-speed parallel cable for outer space environments

Abstract

This utility model discloses a high-speed parallel cable for outer space environments, characterized by: two parallel silver-plated copper conductors, each with an extruded polytetrafluoroethylene (PTFE) insulation layer, and then wrapped with a PTFE microporous membrane to form a wound insulation layer. The two conductors, formed by the extrusion and subsequent wrapping of insulation layers, are then further wrapped with PTFE microporous membranes to form parallel wrapping layers. The cable possesses stable characteristic impedance, low attenuation, excellent radiation resistance, low thermal vacuum release, salt spray resistance, mildew resistance, resistance to damp heat cycling, and flame retardancy.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a high-speed parallel cable for use in outer space environments. Background Technology

[0002] With advancements in aerospace technology, spacecraft systems are trending towards networking. The construction of space-based network infrastructure and the integration of spacecraft into these systems have generated a significant demand for high-speed data transmission exceeding gigabit speeds. Furthermore, the capabilities of remote sensing satellites are improving, leading to a rapid increase in the amount of data generated per unit time. Existing cables are insufficient to meet the high-speed transmission requirements for high-resolution remote sensing satellite image data.

[0003] Ordinary differential high-speed cables typically use (foamed) polyolefin insulation with an outer PET sheath, which cannot meet the requirements of aerospace-grade high-temperature resistance, radiation resistance, and thermal vacuum release. Traditional aerospace applications mostly use coaxial cables, which have high losses and attenuation, making them difficult to adapt to the electrical requirements of differential signal transmission and lacking in anti-interference capabilities.

[0004] Conventional high-frequency transmission parallel cables have ordinary insulation and outer sheath materials, making them prone to failure under the extreme temperature changes and strong radiation of outer space. In addition to high-speed transmission performance, cables used in outer space must also meet multiple requirements depending on the application scenario, such as small outer diameter, light weight, aging resistance, corrosion resistance, flame retardancy, and excellent mechanical toughness. Existing products usually cannot meet all these requirements simultaneously, and innovative designs are needed to overcome these limitations. Utility Model Content

[0005] The technical problem to be solved by the utility model: The purpose of this utility model is to promote the signal transmission of ultra-high frequency outer space environment equipment with speeds of 25Gbps and above, and to develop a high-speed parallel cable for outer space environment.

[0006] Technical solution: To achieve the above objectives, the technical solution provided by this utility model is as follows: a high-speed parallel cable for outer space environment, characterized in that: it includes two parallel silver-plated copper conductors, each of which is extruded with polytetrafluoroethylene to form an extruded insulation layer, and then wrapped with a polytetrafluoroethylene microporous membrane to form a wrapped insulation layer. The two conductors are formed by extruding and then wrapping the insulation layer to form two parallel cores, and then wrapping the polytetrafluoroethylene microporous membrane in parallel to form a parallel wrapping layer.

[0007] As a further improvement of this utility model, a ground wire is provided on each side of the parallel wrapping layer for grounding.

[0008] As a further improvement of this utility model, a parallel wrapping layer and a longitudinal wrapping shielding layer with two ground wires are provided. The shielding layer is made of high-temperature copper foil and the longitudinal wrapping overlap rate is ≥20%.

[0009] As a further improvement of this utility model, the outermost layer of the cable is a sheath layer, which is wrapped with polyimide tape with an overlap rate of ≥60%.

[0010] As a further improvement of this utility model, the extruded insulating layer formed by the polytetrafluoroethylene propylene provides support for the wrapped insulating layer formed by the polytetrafluoroethylene microporous membrane.

[0011] As a further improvement of this utility model, the thickness of the extruded insulation layer is 0.05mm to 0.10mm, and the concentricity is ≥90%; the overlap rate of the wrapped insulation layer is ≥50%.

[0012] As a further improvement of this utility model, the parallel wrapping layer overlap rate is ≥50%.

[0013] Beneficial effects

[0014] I. Addressing the need for high-speed data transmission:

[0015] 1. Parallel conductors are employed, with the outer insulation layer consisting of an extruded polytetrafluoroethylene (PTFE) microporous membrane and a wrapped PTFE microporous membrane. The extruded insulation layer provides stable support for the wrapped insulation layer, reducing deformation of the wrapped tape, ensuring uniform insulation outer diameter, and effectively reducing return loss during data transmission. The wrapped PTFE microporous membrane has an extremely low dielectric constant, meeting the requirements for low signal attenuation in data transmission. The combination of these two components ensures low signal attenuation and stable transmission, meeting the demands of high-speed data transmission.

[0016] 2. Extrusion layer thickness 0.05mm~0.10mm, concentricity ≥90%: The high concentricity requirement can ensure the uniformity of the insulation outer diameter and reduce the return loss in data transmission; the wrapping layer overlap rate ≥50% can ensure the uniformity of the outer diameter of the insulated wire core and further improve the stability of signal transmission.

[0017] 3. The two conductors are first extruded and then wrapped with an insulating layer to form two parallel cores. Then, polytetrafluoroethylene microporous membranes are wrapped around these two parallel cores to form parallel wrapping layers (overlap rate ≥ 50%), which provide stable support under the shielding layer, further improve the stability of signal transmission, and ensure stable high-speed data transmission.

[0018] II. Addressing requirements such as high temperature resistance, radiation resistance, and thermal vacuum gas release.

[0019] 1. The outer layer is wrapped with polyimide tape with an overlap rate of ≥60%. Polyimide has excellent radiation resistance and temperature resistance, which can resist the damage to the cable caused by harsh environmental factors such as strong radiation and extreme temperature changes in outer space, and meet the requirements of aerospace-grade high temperature resistance and radiation resistance.

[0020] Third, it solves the problems of high loss and attenuation in traditional coaxial cables, difficulty in adapting to the electrical requirements of differential signal transmission, and insufficient anti-interference capability:

[0021] 1. The composite insulation layer structure and material selection reduce signal transmission loss and attenuation, meeting the requirements for low-attenuation signal transmission.

[0022] 2. The outer cladding of the parallel core is made of polytetrafluoroethylene microporous membrane with an overlap rate of ≥50%, which can provide stable support under the shielding layer and further improve the signal transmission stability.

[0023] 3. Parallel wrapping layer and ground wires on both sides are longitudinally wrapped with high-temperature copper foil, with a longitudinal wrapping overlap rate of ≥20%. The longitudinal wrapping process can further ensure the stability of signal transmission: high-temperature copper foil has excellent performance, which can meet the shielding requirements of the product under extreme temperature conditions, reduce signal leakage and external interference intrusion, and enhance anti-interference ability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a high-speed parallel cable for use in outer space environments according to this utility model;

[0025] Explanation of the labels in the diagram:

[0026] 1. Conductor; 2. Extruded insulation layer; 3. Wrapped insulation layer; 4. Parallel wrapping layer; 5. Ground wire; 6. Shielding layer; 7. Sheath layer. Detailed Implementation

[0027] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and specific embodiments.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] As shown in the figure, a high-speed parallel cable for use in outer space environments includes two parallel silver-plated copper conductors 1.

[0032] Two conductors 1 are respectively extruded with perfluoroethylene propylene to form an extruded insulation layer 2, and then respectively wrapped with a polytetrafluoroethylene microporous membrane to form a wrapped insulation layer 3. The conductors 1 adopt a composite insulation layer structure of extrusion and wrapping.

[0033] The extruded insulation layer 2 has a thickness of 0.05mm to 0.10mm and a concentricity of ≥90%. The high concentricity ensures the uniformity of the insulation outer diameter and effectively reduces return loss in data transmission. Through process verification, the extruded insulation layer 2 can provide stable support for the wrapped insulation layer, reduce the deformation of the wrapped tape, and ensure the stability of signal transmission.

[0034] The polytetrafluoroethylene (PTFE) microporous membrane has an extremely low dielectric constant, which meets the requirements for low signal attenuation data transmission. However, the PTFE microporous membrane material is soft and easily deformed during processing, causing unstable signal transmission. Therefore, a layer of perfluoroethylene propylene with suitable temperature resistance is extruded under the wrapping insulation layer 3. The two work together to ensure low signal attenuation transmission and solve the problem of deformation of the wrapping tape. The overlap rate of the wrapping insulation layer 3 is ≥50%, which further ensures the uniformity of the outer diameter of the insulated core and improves the stability of signal transmission.

[0035] Two conductors 1 are formed into two parallel wire cores by first extruding and then wrapping an insulating layer. Then, a polytetrafluoroethylene microporous membrane is wrapped around these two parallel wire cores to form a parallel wrapping layer 4. The overlap rate of the parallel wrapping layer 4 is ≥50%, which can provide stable support for the shielding layer 6 and further improve the stability of signal transmission.

[0036] A ground wire 5 is installed on each side of the parallel wrapping layer 4 for grounding. The ground wire 5 is a silver-plated copper conductor. The parallel wrapping layer 4 and the two ground wires 5 are surrounded by a longitudinally wrapped shielding layer 6. The shielding layer 6 is a high-temperature copper foil shielding layer with a longitudinal wrapping overlap rate of ≥20%. The high-temperature copper foil has excellent performance and can meet the shielding requirements of the product under extreme temperature conditions, effectively blocking the influence of external electromagnetic interference on the internal signal of the cable. The longitudinal wrapping process ensures the stability of signal transmission and reduces signal leakage and the intrusion of external interference.

[0037] The outermost layer is the sheath layer 7, which is wrapped with polyimide tape with an overlap rate of ≥60%. Polyimide has excellent radiation resistance and temperature resistance, which can provide the product with excellent protection against the damage to the cable caused by harsh environmental factors such as strong radiation from outer space and extreme temperature changes, thus extending the service life of the cable.

[0038] The high-speed parallel cable for outer space environments provided in this embodiment has passed the following six special performance tests, and all performance indicators meet the requirements.

[0039] 1. Static attenuation

[0040] Static signal attenuation refers to the reduction in amplitude / power of a signal during transmission through a medium due to dielectric loss, radiation loss, and other factors. It is primarily used to evaluate the performance of transmission media in fields such as communications and aerospace. The static attenuation performance indicators of this product at different temperatures and frequencies are as follows:

[0041] At room temperature (25℃): ≤1.5dB / m@0~5GHz; ≤2.2dB / m@5~10GHz; ≤2.8dB / m@10~14GHz;

[0042] High temperature 125℃: ≤1.8dB / m@0~5GHz; ≤2.8dB / m@5~10GHz; ≤3.5dB / m@10~14GHz.

[0043] 2. Decaying fluctuations

[0044] Attenuation fluctuation is used to characterize the dynamic instability of attenuation, as opposed to "static attenuation." Its core characteristic is that "the attenuation fluctuates around a certain baseline value," which may lead to fluctuations in system performance or the risk of failure. The static attenuation performance indicators that this product can meet are as follows: attenuation fluctuation of ±0.2dB / m@0~15GHz; ±0.3dB / m@15~21GHz for conductors of the same length at the same frequency.

[0045] 3. Humidity and heat circulation

[0046] The test shall be performed according to the Type II specification of Method 1002 in GJB 1217A-2009, but step 7a is not required; each test shall last for 24 hours and be repeated 10 times. After the test, the withstand voltage and insulation performance of the cable shall meet the requirements.

[0047] 4. Temperature shock

[0048] According to the test conditions A specified in Method 1003 of GJB 1217A-2009, the temperature range is -55℃ to +125℃. After 5 cycles, the conductor should be undamaged.

[0049] 5. Thermal vacuum gas release

[0050] After testing according to method 4001 in GJB 1217A-2009, TML ≤ 1.0%; CVCM ≤ 0.1%.

[0051] 6. Radiation resistant

[0052] The total radiation dose was 1×10⁵ Gy. After testing according to method 1019.2 in GJB 548B-2005, the insulation resistance, withstand voltage, and appearance of the cable all met the requirements.

[0053] In summary, the high-speed parallel cable for outer space environments provided by this utility model achieves high-speed and stable data transmission and meets the usage requirements of extreme outer space environments, thus having broad application prospects.

[0054] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-speed parallel cable for use in outer space environments, characterized in that: It includes two parallel silver-plated copper conductors. The two conductors are extruded with polytetrafluoroethylene to form an extruded insulation layer, and then wrapped with polytetrafluoroethylene microporous membrane to form a wrapped insulation layer. The two conductors are then wrapped with polytetrafluoroethylene microporous membrane in parallel to form a parallel wrapping layer after the two conductors are formed by extruding and then wrapping the insulation layer.

2. The high-speed parallel cable for outer space environments according to claim 1, characterized in that: A ground wire is provided on each side of the parallel wrapping layer for grounding.

3. The high-speed parallel cable for outer space environments according to claim 2, characterized in that: The parallel wrapping layer and the two ground wires are surrounded by a longitudinal shielding layer. The shielding layer is made of high-temperature copper foil and the longitudinal overlap rate is ≥20%.

4. The high-speed parallel cable for outer space environments according to claim 3, characterized in that: The outermost layer of the cable is the sheath layer, which is wrapped with polyimide tape with an overlap rate of ≥60%.

5. The high-speed parallel cable for outer space environments according to claim 1, characterized in that: The extruded insulating layer formed by the polytetrafluoroethylene propylene provides support for the wrapped insulating layer formed by the polytetrafluoroethylene microporous membrane.

6. The high-speed parallel cable for outer space environments according to claim 1, characterized in that: The thickness of the extruded insulation layer is 0.05mm to 0.10mm, and the concentricity is ≥90%; the overlap rate of the wrapped insulation layer is ≥50%.

7. The high-speed parallel cable for outer space environments according to claim 1, characterized in that: Parallel wrapping overlap rate ≥ 50%.

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