A lightweight, super-flexible, stable coaxial cable

Abstract

The utility model relates to a kind of lightweight super-soft stable coaxial cable, including by inside to outside sequentially coaxial setting inner conductor, dielectric layer, outer conductor, shielding layer and sheath;Inner conductor is stranded by multiple silver-plated copper aluminium alloy single wire, outer conductor is silver-plated copper aluminium alloy flat wire, and is covered in the outside of dielectric layer in the form of spiral winding, shielding layer is multiple silver-plated copper aluminium alloy single wire, and is covered in the outside of outer conductor in the form of cross-woven, sheath is multilayer polytetrafluoroethylene film, and is covered in the outside of shielding layer.The utility model effectively reduces cable weight on the basis of retaining cable phase stability, low transmission loss and the like, improves the softness of cable, so that cable is more suitable for aerospace field low weight, narrow laying space use.

Description

Technical Field

[0001] This utility model belongs to the field of communication coaxial cable technology, specifically relating to a lightweight, ultra-flexible, and stable coaxial cable. Background Technology

[0002] Stable coaxial cables are mainly used in aerospace and weaponry. As a key signal transmission medium in radio frequency links, they have the characteristic of phase stability and are particularly suitable for environments with stringent requirements for phase stability, such as phased array radar. They have a wide range of applications in the military electronics field.

[0003] While traditional stable coaxial cables offer advantages such as phase stability and low attenuation, their conductors typically employ a single silver-plated copper structure, and the sheath uses relatively rigid poly(fluoroethylene propylene) (FEP) or perfluoroalkoxy copolymer (PFA). This makes the weight specifications of traditional stable phase cables increasingly unsuitable for the aerospace field, where weight requirements are becoming more stringent. Furthermore, with the trend towards lighter and smaller equipment, stable phase cables are required to be installed and laid in confined spaces, necessitating improvements in their flexibility. Utility Model Content

[0004] The purpose of this invention is to provide a lightweight, ultra-flexible, stable coaxial cable to solve the problems of large mass and poor flexibility of traditional stable coaxial cables.

[0005] The lightweight, ultra-flexible, and stable coaxial cable of this invention is achieved as follows:

[0006] A lightweight, ultra-flexible, and stable coaxial cable includes, from the inside out, an inner conductor, a dielectric layer, an outer conductor, a shielding layer, and a sheath, all coaxially arranged.

[0007] The inner conductor is made of multiple silver-plated copper-aluminum alloy single wires twisted together. The outer conductor is a silver-plated copper-aluminum alloy flat wire, which is wrapped around the outside of the dielectric layer in a spiral winding manner. The shielding layer is made of multiple silver-plated copper-aluminum alloy single wires, which are wrapped around the outside of the outer conductor in a cross-braided manner. The sheath is a multilayer polytetrafluoroethylene film, which is wrapped around the outside of the shielding layer.

[0008] Furthermore, the silver-plated copper-aluminum alloy single wire and the silver-plated copper-aluminum alloy flat wire respectively include a copper-aluminum alloy core and a silver plating layer from the inside to the outside.

[0009] The thickness of the silver plating layer is not less than 1 μm.

[0010] Furthermore, the multiple silver-plated copper-aluminum alloy single wires of the inner conductor are stranded in a 100% untwisted manner.

[0011] Furthermore, the outer diameter fluctuation range of the inner conductor is controlled within ±0.02mm.

[0012] Furthermore, the dielectric layer is a multilayer polytetrafluoroethylene film, which is wrapped around the outside of the inner conductor in an overlapping manner.

[0013] Furthermore, the polytetrafluoroethylene film is a polytetrafluoroethylene semi-air film with a dielectric constant between 1.38 and 1.50.

[0014] Furthermore, in the dielectric layer, the wrapping direction of the polytetrafluoroethylene film alternates left and right sequentially from the inside to the outside.

[0015] Furthermore, in the outer conductor layer, the silver-plated copper-aluminum alloy flat strip is spirally wrapped with a 50% overlap.

[0016] Furthermore, in the shielding layer, multiple silver-plated copper-aluminum alloy single wires in the same layer are arranged in parallel, and the silver-plated copper-aluminum alloy single wires in adjacent layers are arranged in a cross pattern.

[0017] The intersection angle between two adjacent layers of silver-plated copper-aluminum alloy single lines ranges from 45° to 72°.

[0018] Furthermore, the sheath includes at least one layer of polytetrafluoroethylene semi-air film located inside, and a layer of polytetrafluoroethylene raw material film located on the outermost layer.

[0019] After adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0020] While retaining the advantages of stable cable phase and low transmission loss, this invention effectively reduces cable weight and improves cable flexibility, enabling the cable to fully meet the lightweight requirements of the aerospace field and be more suitable for use in confined spaces in the aerospace field. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a structural diagram of a lightweight, ultra-flexible, and stable coaxial cable according to a preferred embodiment of the present invention.

[0023] In the diagram: Inner conductor 10, dielectric layer 20, outer conductor 30, shielding layer 40, sheath 50. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments.

[0025] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0026] A lightweight, ultra-flexible, and stable coaxial cable includes an inner conductor 10, a dielectric layer 20, an outer conductor 30, a shielding layer 40, and a sheath 50 arranged coaxially from the inside out. The inner conductor 10 is made of multiple silver-plated copper-aluminum alloy single wires twisted together. The outer conductor 30 is a silver-plated copper-aluminum alloy flat wire, which is spirally wound around the outside of the dielectric layer 20. The shielding layer 40 is made of multiple silver-plated copper-aluminum alloy single wires, which are cross-braided around the outside of the outer conductor 30. The sheath 50 is a multilayer polytetrafluoroethylene film, which is wrapped around the outside of the shielding layer 40.

[0027] Silver-plated copper-aluminum alloy single wire and silver-plated copper-aluminum alloy flat wire respectively consist of a copper-aluminum alloy core and a silver plating layer from the inside out.

[0028] The silver plating layer thickness of the silver-plated copper-aluminum alloy single wire and the silver-plated copper-aluminum alloy flat wire is consistent, and is not less than 1μm. This thickness range of silver plating layer can effectively ensure that the signal can be transmitted on the silver plating layer at a certain transmission frequency (2GHz and above), and improve the oxidation resistance of the inner conductor 10 and the outer conductor 30, and improve the high temperature resistance of the coaxial cable.

[0029] The silver-plated copper-aluminum alloy material is a lightweight silver-plated copper-aluminum alloy material with low density and good flexibility. Based on the skin effect formed during high-frequency signal transmission, the current is mainly transmitted on the surface silver plating layer during signal transmission, thereby ensuring low transmission loss of the cable.

[0030] The dielectric layer 20 is a multilayer polytetrafluoroethylene film, which is wrapped around the outside of the inner conductor 10 in a lap-over manner.

[0031] Among them, the polytetrafluoroethylene film of the dielectric layer 20 is a polytetrafluoroethylene semi-air film, which is a film formed by stretching a polytetrafluoroethylene raw material film to form a mesh-like structure. Due to the presence of the mesh structure, the film is filled with air, hence the name semi-air film. Polytetrafluoroethylene semi-air film has the characteristics of extreme temperature resistance, high air permeability and waterproofness, as well as excellent electrical insulation, while also having the advantages of good chemical stability and low coefficient of friction.

[0032] The dielectric layer 20 is covered in an overlapping manner, which not only ensures the continuity and uniformity of the dielectric layer 20 and improves the mechanical strength and stability of the cable, but also optimizes the electrical performance of the cable and reduces the non-uniformity of the electric field distribution.

[0033] In the dielectric layer 20, the wrapping direction of the polytetrafluoroethylene film from the inside to the outside alternates left and right.

[0034] The polytetrafluoroethylene film of the dielectric layer 20 is wrapped in an alternating left and right direction, which has the advantages of ensuring structural stability, uniform stress, and improved electrical performance.

[0035] In shielding layer 40, multiple silver-plated copper-aluminum alloy single wires in the same layer are arranged in parallel, and the silver-plated copper-aluminum alloy single wires in adjacent layers are arranged in a cross pattern, which can comprehensively improve shielding performance, enhance mechanical stability, and ensure signal transmission quality.

[0036] The sheath 50 includes an inner multilayer polytetrafluoroethylene semi-air film and an outermost polytetrafluoroethylene raw material film.

[0037] Polytetrafluoroethylene (PTFE) raw material film is a film made from PTFE raw material, which has good insulation, high and low temperature resistance and corrosion resistance.

[0038] The outermost layer is made of polytetrafluoroethylene raw material film. Heat treatment can be used to create adhesion at the seams, thus forming a dense protective layer on the outermost part of the cable. This ensures the sheath is flexible while protecting the inner structure from damage caused by moisture and chemical corrosion.

[0039] Secondly, the preparation method for the aforementioned lightweight, ultra-flexible, and stable coaxial cable includes the following steps:

[0040] Step 1: Stranding the inner conductor 10. Multiple silver-plated copper-aluminum alloy single wires are stranded into shape using a regular stranding method. During the stranding process, an arc-shaped mold is used to press the inner conductor 10 tightly, which can ensure the uniformity and consistency of the outer diameter of the inner conductor 10.

[0041] Specifically, during the stranding process, the silver-plated copper-aluminum alloy single wires must be released using an active constant tension release method. A torque feedback device ensures that the tension deviation of the single wire during stranding is controlled within ±0.2N. If it exceeds 0.2N, the tension of some single wires among the multiple silver-plated copper-aluminum alloy single wires will be inconsistent with the others, forming periodic uneven defects on the surface of the inner conductor 10. Since the cable of this invention is mainly used for transmitting radio frequency signals, periodic defects on the surface of the inner conductor 10 will cause periodic changes in cable impedance. These defects, through continuous superposition of signal waves, will form serious defects and result in voltage standing wave ratio peaks during testing. Therefore, in this invention, the tension deviation of the silver-plated copper-aluminum alloy single wires during stranding of the inner conductor 10 must be controlled within ±0.2N.

[0042] The multiple silver-plated copper-aluminum alloy single wires of the inner conductor 10 are stranded in a 100% untwisted manner to avoid twisting of the single wires.

[0043] The specific performance indicators of the stranded inner conductor 10, such as outer diameter tolerance, density, tensile strength, and elongation at break, as well as the silver plating thickness parameters of the silver-plated copper-aluminum alloy single wire, are as follows:

[0044] outer diameter tolerance mm ±0.02 density <![CDATA[g / cm 3 ]]> 4.0±0.5 Tensile strength MPa 200±20 Elongation at break ％ ≥10 Silver plating thickness μm ≥1

[0045] Specifically, the outer diameter tolerance of the inner conductor 10 is controlled within ±0.02 mm, and its density is approximately 4.0 g / cm³. 3 (The error range does not exceed ±0.5g / cm3), the tensile strength is within the range of 200±20MPa, the elongation at break is not less than 10%, and the thickness of the silver plating layer of the silver-plated copper-aluminum alloy single wire is not less than 1μm.

[0046] Among them, the outer diameter tolerance and tensile strength of the inner conductor 10 are controlled by positive and negative values, which can effectively ensure the consistency of the silver-plated copper-aluminum alloy single wire, which has better tensile strength. Furthermore, the silver-plated copper-aluminum alloy single wire will not deform due to tension during the production process, thereby further ensuring the product performance of the coaxial cable.

[0047] Step 2: Coating dielectric layer 20, multilayer polytetrafluoroethylene film is coated on the outside of inner conductor 10 in a overlapping manner, and the coating direction of polytetrafluoroethylene film from the inside to the outside alternates left and right.

[0048] Furthermore, during the wrapping process of the dielectric layer 20, it is necessary to straighten it using a straightening fixture to prevent the inner conductor 10 from bending due to the reeling process, which would affect the concentricity of the cable structure. Also, an active cable laying method is used during the laying process.

[0049] The PTFE film used in the dielectric layer is a semi-air PTFE film with a dielectric constant between 1.38 and 1.50. PTFE semi-air films possess advantages such as resistance to high and low temperatures, strong chemical stability, smooth surface, extremely low coefficient of friction, and good electrical insulation properties. The lower dielectric constant effectively ensures minimal phase change with temperature in the cable, and also results in lower dielectric loss during signal transmission, thus guaranteeing the advantages of phase stability and low transmission loss.

[0050] The polytetrafluoroethylene semi-air film adopts an alternating left and right wrapping direction, which has the advantages of ensuring structural stability, improving electrical performance, and enhancing waterproof performance.

[0051] Step 3: Wrap the outer conductor 30. Wrap a layer of silver-plated copper-aluminum alloy flat strip around the outside of the dielectric layer 20 in a spiral winding manner. During the wrapping process, a rotating clamping device that rotates synchronously with the outer conductor 30 is used to make close contact with the silver-plated copper-aluminum alloy flat strip. This ensures that the surface of the outer conductor 30 is free from damage and scratches while clamping the outer conductor 30 to control its outer diameter.

[0052] The silver-plated copper-aluminum alloy flat strip is spirally wrapped with a 50% overlap, so that the overall thickness of the outer conductor 30 is about twice the thickness of the silver-plated copper-aluminum alloy flat strip, and the thickness is uniform. This ensures that the concentricity of the inner conductor 10 and the outer conductor 30, as well as the thickness of the dielectric layer 20, are uniform in the cross-section of the cable.

[0053] Step 4: Braiding the shielding layer 40. Multiple silver-plated copper-aluminum alloy single wires are used to form a cross-braided shielding layer 40 outside the outer conductor 30. The multiple silver-plated copper-aluminum alloy single wires in the same layer are arranged side by side, and the silver-plated copper-aluminum alloy single wires in adjacent layers are arranged crosswise to form a cross-braided structure. The braiding density is not less than 93%, and the cable shielding efficiency can be guaranteed to be above 91dB, thereby enabling the cable to isolate external electromagnetic wave signal interference.

[0054] The thickness of the silver plating layer outside the silver-plated copper-aluminum alloy single wire used to form the braided shielding layer 40 is the same as that of the silver-plated copper-aluminum alloy single wire of the inner conductor 10, that is, its thickness is not less than 1μm.

[0055] During the production process, by controlling the unwinding tension of each silver-plated copper-aluminum alloy single wire, the single wire can be kept relatively straight during production without being stretched and thinned by the equipment tension.

[0056] Preferably, in order to ensure the flexibility of the cable, the 40° braiding angle of the shielding layer, that is, the crossing angle of the two adjacent silver-plated copper-aluminum alloy single wires, ranges from 45° to 72°.

[0057] Step 5: Cover the sheath 50. Cover the shielding layer 40 with multiple layers of polytetrafluoroethylene film to form the sheath 50. The inner layer is made of at least one layer of polytetrafluoroethylene semi-air film, and the outermost layer is made of polytetrafluoroethylene raw material film. The polytetrafluoroethylene raw material film is heat-treated to form a sealing layer.

[0058] During the production process, the coating process of the sheath 50 is basically the same as that of the dielectric layer 20. After the coating is completed, a precise surface heat treatment is required to seal the gaps in the coating of the polytetrafluoroethylene raw material film.

[0059] The performance indicators of the polytetrafluoroethylene (PTFE) raw film are as follows:

[0060] Width tolerance mm ±0.15 Thickness tolerance mm ±0.004 density <![CDATA[g / cm 3 ]]> 1.4～1.7 Tensile strength MPa ≥10 Elongation at break ％ ≥90

[0061] Specifically, the width tolerance of the PTFE raw film is controlled within ±0.15 mm, the thickness tolerance within ±0.004 mm, and the density range is 1.4–1.7 g / cm³. 3 The tensile strength is not less than 10 MPa and the elongation at break is not less than 90%.

[0062] By strictly controlling the structural dimensions (width, thickness, density) of the PTFE raw material film within the above-mentioned range, and controlling the error using positive and negative values, the consistency of the PTFE raw material film can be guaranteed, its tensile strength can be improved, and the problem of PTFE raw material film deformation due to tension during the production process can be avoided, thereby further ensuring the product performance of the coaxial cable.

[0063] Heat treatment is generally carried out through air heat conduction. The processing temperature of heat treatment is extremely important. The combination of processing temperature and processing time determines whether the depth of heat treatment is reasonable.

[0064] In this invention, the heat treatment temperature range is 500℃~550℃, and the treatment time is 1 minute. Performing heat treatment at this temperature for 1 minute can ensure the reliability of the cable and greatly improve its flexibility.

[0065] The specific details regarding the selection of heat treatment temperature and heat treatment time are as follows:

[0066] The air-heat conduction processing channel uses a six-segment heating system. The heating temperature settings for each segment are as follows:

[0067] If it's the first temperature scenario:

[0068]

[0069] At this temperature, the sheath 50 needs to be treated in a hot environment for 2 minutes to form an adhesive seal on the outermost layer. During this process, due to the long-term exposure to the hot environment, heat can be conducted through the sheath 50 to the shielding layer 40 and the outer conductor 30. Since the shielding layer 40 and the outer conductor 30 are both made of metal, they have good thermal conductivity, which in turn causes heat to be conducted to the dielectric layer 20, causing the dielectric layer 20 to be heated. Since the dielectric layer 20 is made of polytetrafluoroethylene semi-air film, it will undergo structural changes when heated, and the dielectric constant will increase significantly (e.g., from 1.45 to 2.1), which directly affects signal transmission and the overall flexibility of the cable.

[0070] If it's the second temperature scenario:

[0071]

[0072] At this temperature, to avoid the impact of heat conduction on the insulation, the sheath 50 only needs to be treated in this thermal environment for 0.5 minutes. If this time is exceeded, the dielectric constant and density of the dielectric layer 20 will change. Although the sheath 50 can form an adhesive seal within 0.5 minutes, the sealing layer is relatively thin and will crack during subsequent use.

[0073] If it's the third temperature scenario:

[0074]

[0075] At this temperature, the processing time is 1 minute. The heat treatment will not affect the dielectric layer 20, and the sealing layer thickness of the sheath 50 is appropriate. This ensures the reliability of the cable and greatly improves its flexibility. Therefore, this temperature range and processing time are selected when the present invention adopts a six-stage heat treatment.

[0076] Example

[0077] This embodiment uses a 50-4 stable phase low-loss radio frequency coaxial cable as an example, and its specific structure is as follows:

[0078] The inner conductor 10 is made of 7×0.48mm (7 single wires, each with a diameter of 0.48mm) silver-plated copper-aluminum alloy single wires stranded together. The outer diameter of the inner conductor 10 is 1.40±0.02mm, and the silver plating layer thickness of the silver-plated copper-aluminum alloy single wire is 2μm.

[0079] The dielectric layer 20 is made of polytetrafluoroethylene semi-air film with a density of 0.7 g / cm3, wrapped in four layers. The thickness of each layer of polytetrafluoroethylene semi-air film is 0.152 mm, and the width of each layer of polytetrafluoroethylene semi-air film is 8 mm, 10 mm, 12 mm and 15 mm respectively. The outer diameter of the dielectric layer 20 is 3.75 ± 0.05 mm.

[0080] The outer conductor 30 is made of 2.5×0.05mm (width is 2.5mm and thickness is 0.05mm) silver-plated copper-aluminum alloy flat strip with a silver plating layer thickness of 2μm and a coverage rate of 50%. The outer diameter of the outer conductor 30 is 3.95±0.05mm.

[0081] The shielding layer 40 adopts a 24×7×0.10mm (7 layers of braiding, each layer has 24 strands of silver-plated copper-aluminum alloy single wire, and the diameter of each silver-plated copper-aluminum alloy single wire is 0.10mm) braiding structure, with a braiding angle of 62° and a braiding pitch of 25mm. The outer diameter of the shielding layer 40 is 4.35±0.05mm.

[0082] The sheath 50 has a two-layer structure. The first layer, from the inside out, uses a material with a density of 0.7 g / cm³. 3The second layer is a polytetrafluoroethylene semi-air film with a density of 1.7 g / cm³. 3 The polytetrafluoroethylene raw material film has two layers, each with a thickness of 0.051 mm and a width of 20 mm. The outer diameter of the sheath 50 is 4.70 ± 0.10 mm.

[0083] The imported cable (model CXN3449) is a high-performance, phase-stable, low-loss radio frequency coaxial cable manufactured by GORE. Its inner conductor 10 is made of silver-plated copper wire (diameter 1.40mm), the insulation layer (dielectric layer 20) is made of low-density polytetrafluoroethylene film (thickness between 3.70mm and 3.75mm), the shielding layer 40 (total thickness approximately 4.40mm-4.70mm) consists of two layers: silver-plated copper foil wrapping and silver-plated copper wire braiding, and the sheath 50 is made of fluoroplastic material (thickness approximately 4.80mm).

[0084] The performance of this cable is compared with that of an imported cable (model CXN3449) as follows:

[0085]

[0086] The above comparison shows that the cable prepared by this utility model has the following advantages:

[0087] (1) The inner conductor 10 is made of lightweight silver-plated copper-aluminum alloy conductor, which reduces the material density and significantly improves the flexibility. According to the skin effect formed when the high-frequency signal is transmitted, the current is mainly transmitted on the surface silver layer during signal transmission, thereby ensuring the transmission loss of the cable.

[0088] (2) The outer conductor 30 and the shielding layer 40 are respectively made of lightweight silver-plated copper-aluminum alloy material to replace silver-plated copper foil and silver-plated copper material, while maintaining the traditional wrapping and braiding process. This reduces the material density of the outer conductor 30 and the shielding layer 40, thereby reducing the cable quality. The silver-plated copper-aluminum alloy material has significantly improved flexibility compared to silver-plated copper.

[0089] (3) The sheath 50 is made of softer raw polytetrafluoroethylene (PTFE) material. The surface is precisely heat treated to ensure the sealing and flexibility of the sheath 50. This prevents the internal structure from being severely squeezed and deformed due to bending of the sheath 50 during the cable laying process with a low bending radius, thus preventing signal transmission failure or link mismatch.

[0090] In summary, the cable of this utility model effectively reduces the cable weight by 47.6% while retaining the advantages of stable cable phase and low transmission loss. It also improves the cable's flexibility, reducing the bending radius by 38%, making the cable more suitable for use in aerospace fields and in confined spaces with low bending radii.

[0091] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A lightweight, ultra-flexible, and stable coaxial cable, characterized in that, It includes, from the inside out, an inner conductor, a dielectric layer, an outer conductor, a shielding layer, and a sheath, arranged coaxially; among which, The inner conductor is made of multiple silver-plated copper-aluminum alloy single wires twisted together. The outer conductor is a silver-plated copper-aluminum alloy flat wire, which is wrapped around the outside of the dielectric layer in a spiral winding manner. The shielding layer is made of multiple silver-plated copper-aluminum alloy single wires, which are wrapped around the outside of the outer conductor in a cross-braided manner. The sheath is a multilayer polytetrafluoroethylene film, which is wrapped around the outside of the shielding layer.

2. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, The silver-plated copper-aluminum alloy single wire and the silver-plated copper-aluminum alloy flat wire respectively include a copper-aluminum alloy inner core and a silver plating layer from the inside to the outside. The thickness of the silver plating layer is not less than 1 μm.

3. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, The multiple silver-plated copper-aluminum alloy single wires of the inner conductor are stranded in a 100% untwisted manner.

4. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, The outer diameter fluctuation range of the inner conductor is controlled within ±0.02mm.

5. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, The dielectric layer is a multilayer polytetrafluoroethylene film, which is wrapped around the outside of the inner conductor in an overlapping manner.

6. The lightweight, ultra-flexible, and stable coaxial cable according to claim 5, characterized in that, The polytetrafluoroethylene film is a polytetrafluoroethylene semi-air film with a dielectric constant between 1.38 and 1.

50.

7. The lightweight, ultra-flexible, and stable coaxial cable according to claim 5, characterized in that, In the dielectric layer, the wrapping direction of the polytetrafluoroethylene film alternates left and right from the inside to the outside.

8. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, In the outer conductor layer, the silver-plated copper-aluminum alloy flat wire is spirally wrapped with a 50% overlap.

9. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, In the shielding layer, multiple silver-plated copper-aluminum alloy single wires in the same layer are arranged in parallel, and the silver-plated copper-aluminum alloy single wires in adjacent layers are arranged in a cross pattern. The intersection angle between two adjacent layers of silver-plated copper-aluminum alloy single lines ranges from 45° to 72°.

10. The lightweight, ultra-flexible, and stable coaxial cable according to claim 1, characterized in that, The sheath includes at least one layer of polytetrafluoroethylene semi-air film located inside, and a layer of polytetrafluoroethylene raw material film located on the outermost layer.

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