High-temperature-resistant radio frequency coaxial cable with insulation and sheath layer of mixed medium wrapping structure
By using insulating and sheathing layers as a hybrid medium wrap structure in RF coaxial cables, multi-layer spiral wrap and high-temperature resistant materials, the problem of insufficient signal attenuation and temperature resistance characteristics of traditional cables in high-temperature environments is solved, and efficient signal transmission and electrical performance maintenance are achieved in 350℃ environments.
Patent Information
- Application Number
- CN202421834639.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-31
AI Technical Summary
Traditional RF coaxial cables have problems with insufficient signal attenuation and temperature resistance characteristics in high temperature environments, especially in a high temperature environment of 350℃, the attenuation of the cable will increase under the action of high temperatures, affecting the reliability of signal transmission.
A high-temperature resistant RF coaxial cable is designed with an insulating and sheathing layer as a hybrid medium wrapping structure. The insulating layer covers the inner conductor surface through a multi-layer spiral wrapping structure, including a polyimide film and a polytetrafluoroethylene film alternately. The intermediate layer and the outer cover are also designed with high-temperature resistant materials and structures to block heat transfer and protect the internal structure of the cable.
In the high temperature environment of 350℃, the signal attenuation of the cable is reduced, and the electrical performance indicators are maintained excellent, which significantly improves the adaptability and reliability of RF coaxial cables in high temperature environments.
Smart Images
Figure CN223023574U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of radio frequency coaxial cable structures, in particular to a high-temperature-resistant radio frequency coaxial cable with a hybrid dielectric wrapped structure for the insulation and sheath layers. Background Art
[0002] Traditional radio frequency coaxial cables are a type of cable used for transmitting high-frequency signals and are widely applied in fields such as television signal transmission, communication networks, satellite communication, radio, and radar systems. They are favored for their stability and reliability.
[0003] This cable is composed of an inner conductor, an insulating layer, a shielding layer, and an outer protective layer from the inside out. The design of the inner conductor and the insulating layer results in relatively low signal transmission losses, making it suitable for long-distance high-frequency signal transmission requirements. The design of the shielding layer can effectively prevent the influence of external electromagnetic interference on the signal and ensure the stability and reliability of signal transmission.
[0004] However, the operating temperature of traditional radio frequency coaxial cables generally ranges between -65°C and +165°C. Although the short-term high-temperature resistance can reach 200°C, with the rapid development of communication technologies, the traditional temperature resistance characteristics can no longer meet the usage requirements in some harsh environments, such as a high-temperature environment of 350°C. It is necessary to ensure that the cable does not fail in a high-temperature environment and also ensure high electrical performance indicators. Therefore, the improvement based on the conventional radio frequency coaxial cable structure cannot be limited to simply adding a high-temperature-resistant outer sheath layer. This external heat insulation cannot block the heat transfer from the inner conductor and the inner shielding layer to the adjacent insulating layer. Additionally, for the traditional insulating layer material, polytetrafluoroethylene film, the attenuation from the dielectric will increase under high-temperature conditions, resulting in an increase in the overall attenuation of the cable at high temperatures. Therefore, it is very necessary to prepare a high-temperature-resistant radio frequency coaxial cable with a hybrid dielectric wrapped structure for the insulation and sheath layers that can improve the overall high-temperature resistance characteristics of the cable without affecting the electrical performance indicators of the cable in a high-temperature environment. Summary of the Utility Model
[0005] The purpose of the utility model is to overcome the above problems existing in the prior art and provide a high-temperature-resistant radio frequency coaxial cable with a hybrid dielectric wrapped structure for the insulation and sheath layers. The operating temperature of this cable can reach 350°C, and it has excellent electrical performance indicators, greatly improving the adaptability and reliability of the radio frequency coaxial cable in a high-temperature environment.
[0006] The utility model provides a high-temperature-resistant radio frequency coaxial cable with a hybrid dielectric wrapped structure for the insulation and sheath layers, including an inner conductor, an insulating layer, a shielding layer, and an outer protective layer coaxially arranged from the inside out. The outer protective layer is a high-temperature-resistant adhesive layer. The insulating layer covers the surface of the inner conductor in the form of multi-layer spiral winding. The multi-layer spiral winding is formed by alternating layers of a polyimide film and multiple layers of polytetrafluoroethylene films; it further includes:
[0007] The intermediate layer is arranged between the shielding layer and the high-temperature resistant adhesive layer, and the intermediate layer covers the shielding layer in the form of spiral winding of multiple polyimide films, and the high-temperature resistant adhesive layer covers the intermediate layer.
[0008] Preferably, the shielding layer includes an inner shielding layer and an outer shielding layer. The inner shielding layer covers the insulating layer in the form of spiral winding, and the outer shielding layer covers the intermediate layer in the form of a braided mesh.
[0009] Preferably, the materials of the inner conductor and the outer shielding layer are silver-plated copper wires.
[0010] Preferably, the material of the inner shielding layer is silver-plated copper tape.
[0011] Preferably, the high-temperature resistant adhesive layer covers the intermediate layer in the form of spiral winding with an imide silica gel film.
[0012] Preferably, the high-temperature resistant adhesive layer is heat-cured on the intermediate layer.
[0013] Preferably, the insulating layer covering the inner conductor by spiral winding is formed by spiral winding of one layer of polyimide film laminated with three layers of polytetrafluoroethylene film.
[0014] Preferably, the number of winding layers of the spiral winding material of the insulating layer is 7 layers.
[0015] Preferably, the polyimide film of the intermediate layer is two layers.
[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0017] The present utility model provides a high-temperature resistant radio frequency coaxial cable with a hybrid dielectric winding structure for the insulating and sheath layers, which ensures the use of the cable in a high-temperature environment of 350 °C and at the same time ensures that the electrical performance indexes do not suffer significant losses. And the high-temperature resistant radio frequency coaxial cable with a hybrid dielectric winding structure provided by the present invention reduces the signal attenuation caused by the temperature rise of the cable while ensuring operation in a high-temperature environment.
[0018] The high-temperature resistant radio frequency coaxial cable involved in the present utility model comprehensively considers the high-temperature resistance of the outer sheath layer and the heat transfer effects from the inner conductor and the shielding layer, and optimizes the design of the high-temperature resistant structures of the insulating layer and the outer sheath layer. The designed structure of the insulating layer has a total of nine layers. The first insulating layer adjacent to the inner conductor adopts a polyimide film spiral winding structure to achieve the purpose of blocking the temperature rise caused by heat transfer from the inner conductor. The second to the fourth layers adopt a polytetrafluoroethylene film spiral winding structure with relatively low dielectric loss, which can effectively reduce the attenuation of the cable. The fifth insulating layer adopts a polyimide film spiral winding structure to play a role in supporting the overall high-temperature resistance of the insulating layer and prevent the deformation of the insulating structure due to excessive temperature rise. The sixth to the eighth layers also adopt a polytetrafluoroethylene film spiral winding structure with relatively low dielectric loss to further reduce the attenuation of the cable. The ninth insulating layer is adjacent to the inner shielding layer. Considering the temperature rise caused by heat transfer from the inner shielding layer, this layer also adopts a polyimide film spiral winding structure to achieve the purpose of blocking the temperature rise from the inner shielding layer.
[0019] In addition, the present utility model patent also improves the high-temperature resistance ability of the outer sheath layer, designs an intermediate layer and a high-temperature resistant adhesive layer. The intermediate layer adopts a two-layer polyimide film spiral winding structure and covers the outer shielding layer. The outermost layer adopts a polyimide silicone film spiral winding structure and covers the intermediate layer. After high-temperature treatment, the polyimide silicone film is heat-melted and sealed on the surface of the intermediate layer to form a three-layer reliable and tight high-temperature resistant outer sheath, which effectively blocks the heat radiation from the high-temperature environment and further improves the high-temperature resistant characteristics of the cable. Description of the Drawings
[0020] Figure 1 It is a schematic diagram of the overall structure of a high-temperature resistant radio frequency coaxial cable with a hybrid dielectric winding structure for the insulating and sheath layers of the present utility model;
[0021] Figure 2 It is a schematic diagram of the structure of a high-temperature resistant radio frequency coaxial cable with a hybrid dielectric winding structure for the insulating and sheath layers of the present utility model.
[0022] Description of the Reference Numerals:
[0023] 1. Inner conductor; 2. Insulating layer; 3. Inner shielding layer; 4. Outer shielding layer; 5. Intermediate layer; 6. Outer sheath. Specific Embodiments
[0024] The following combines the attached Figure 1 ~attached Figure 2 , and describes the specific embodiments of the present utility model in detail. However, it should be understood that the protection scope of the present utility model is not limited by the specific embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0025] The inventors found that the short-term temperature resistance of traditional radio frequency coaxial cables can reach 200 °C. The limitation of this temperature resistance mainly depends on the outer sheath layer material. By optimizing the outer sheath material and its structural form, it is possible to ensure the use at higher temperatures to a certain extent. However, due to the heat transfer effect in a high-temperature environment, heat will extend inward along the inner conductor and shielding layer of the cable, thereby affecting the insulation layer structure of the cable. And the insulation layer will cause an increase in cable attenuation under high-temperature action. Although the cable can work in a high-temperature environment, the increase in attenuation caused by this temperature rise will reduce the reliability of signal transmission.
[0026] When traditional radio frequency coaxial cables are designed for high-temperature resistance, only the high-temperature-resistant structure of the outer sheath is considered. In a high-temperature environment, heat invades the cable interior not only through the sheath layer. The connectors connected to both ends of the cable are made of metal materials. The metal connectors are connected to the inner conductor and shielding layer of the cable by welding, and the connectors are directly exposed to the high-temperature environment. The heat conduction phenomenon of the metal connectors will directly transfer heat to the inner conductor and shielding layer of the cable. The insulation layer of the cable is located between the shielding layer and the inner conductor. The temperature rise brought by heat transfer will directly act on the insulation layer adjacent to the inner conductor and shielding layer, which will cause an increase in the attenuation of the insulation layer and affect the transmission of radio frequency signals.
[0027] In order to solve the problems existing in the above-mentioned prior art, the present utility model provides a high-temperature-resistant radio frequency coaxial cable with a hybrid dielectric winding structure for the insulation and sheath layers. While ensuring operation in a high-temperature environment, it reduces the signal attenuation caused by the temperature rise of the cable.
[0028] Referring to the attached Figure 1 ~the attached Figure 2 As shown, in an embodiment, a high-temperature-resistant radio frequency coaxial cable with a hybrid dielectric winding structure for the insulation and sheath layers includes an inner conductor 1, an insulation layer 2, a shielding layer, and an outer sheath 6 coaxially arranged from the inside out. The outer sheath 6 is a high-temperature-resistant adhesive layer. The insulation layer 2 covers the surface of the inner conductor 1 in a form of multi-layer spiral winding. The multi-layer spiral winding is formed by laminating and alternating one layer of polyimide film and multiple layers of polytetrafluoroethylene films; that is, the first layer of the insulation layer adjacent to the inner conductor 1 adopts a polyimide film spiral winding structure to achieve the purpose of blocking the temperature rise generated by heat transfer from the inner conductor. The other multiple layers adopt a polytetrafluoroethylene film spiral winding structure, which can effectively reduce the attenuation of the cable. Next, the insulation layer adopts a polyimide film spiral winding structure to play a high-temperature-resistant supporting role for the overall insulation layer and avoid deformation of the insulation structure due to excessive temperature rise. Next, a multi-layer polytetrafluoroethylene film spiral winding structure with a smaller dielectric loss is adopted to further reduce the attenuation of the cable; it further includes:
[0029] The intermediate layer 5 is disposed between the shielding layer and the high-temperature resistant adhesive layer, and the intermediate layer 5 covers the shielding layer in the form of multi-layer polyimide film spiral winding, and the high-temperature resistant adhesive layer covers the intermediate layer 5.
[0030] The utility model patent replaces the insulation layer near the inner conductor and the shielding layer structure part of the traditional radio frequency coaxial cable with a high-temperature resistant polyimide film, which blocks the heat transferred from the outside to the inner conductor and the shielding layer, protects the intermediate insulation layer from the influence of high temperature. At the same time, a high-temperature resistant intermediate layer structure is added outside the shielding layer to reduce the influence of the external high-temperature environment on the shielding layer. At the same time, the sheathed layer structure formed by extrusion molding of the traditional radio frequency coaxial cable is replaced with a high-temperature resistant polyimide silicone film spiral winding structure, and the adhesive effect is achieved by heating, ensuring the tightness and reliability of the outermost high-temperature resistant winding structure. By blocking heat transfer inside and outside, the high-temperature resistance characteristics of the cable are further improved. The intermediate layer 5 is a high-temperature resistant strengthening structure, which covers between the outer shielding layer 4 and the high-temperature resistant adhesive layer in a spiral winding manner, playing a further role in high-temperature protection and reducing the influence of high-temperature transfer on the inner shielding layer 3 and the outer shielding layer 4.
[0031] Specifically, the shielding layer includes an inner shielding layer 3 and an outer shielding layer 4. The inner shielding layer 3 covers the insulation layer 2 in the form of spiral winding to form a complete shielding layer coverage. The spiral winding structure of the silver-plated copper tape can improve the overall shielding efficiency of the cable, and at the same time, the spiral structure can also increase the bending resistance of the cable. The outer shielding layer 4 covers the intermediate layer 5 in the form of a braided mesh. The braided mesh structure has a certain stretchability and can resist the pulling of the outside on the cable. At the same time, the high-density silver-plated copper wire braided mesh can further improve the shielding efficiency of the cable. The matching structure of the inner shielding layer 3 and the outer shielding layer 4 improves the overall structural stability of the cable.
[0032] Specifically, the materials of the inner conductor 1 and the outer shielding layer 4 are silver-plated copper wires. Because the copper substrate has a good conductivity, and this high-temperature resistant radio frequency coaxial cable has a relatively high operating frequency. According to the skin effect, at high frequencies, the radio frequency signal only flows through the surface of the conductor. Therefore, the surfaces of the inner conductor 1 and the shielding layer 4 are made of silver-plated material, which can effectively ensure the reliability of the cable signal transmission.
[0033] Specifically, the material of the inner shielding layer 3 is a silver-plated copper strip. Since the silver-plated copper strip is processed on the insulating layer 2 by a spiral winding process, 100% shielding coverage is achieved. While improving the overall shielding efficiency of the cable, the spiral structure can also increase the bending resistance of the cable. Since the inner shielding layer 3 has achieved 100% shielding coverage, the outer shielding layer 4 adopts a silver-plated copper wire braided mesh structure with higher production efficiency and relatively lower cost. While further improving the shielding coverage, the braided mesh structure can also enhance the overall tensile effect of the cable, making up for the structural limitations of the inner shielding layer 3.
[0034] Specifically, the high-temperature resistant adhesive layer is covered on the intermediate layer 5 in the form of a spiral winding by a polyimide silicone film, and the high-temperature resistant adhesive layer is heat-cured on the intermediate layer 5.
[0035] The high-temperature resistant adhesive layer is covered on the intermediate layer 5 by a spiral winding method using a polyimide silicone film and is heat-cured on the surface of the intermediate layer 5 to form a reliable and tight high-temperature resistant adhesive layer. The intermediate layer 5 and the high-temperature resistant adhesive layer constitute the outer sheath structure of the cable, providing high-temperature protection for the internal structure of the cable.
[0036] Specifically, the insulating layer 2 spirally wound around the inner conductor 1 is formed by spirally winding one layer of polyimide film laminated with three layers of polytetrafluoroethylene film, and the number of winding layers of the spiral winding material of the insulating layer 2 is 9 layers.
[0037] An insulating layer 2 is wound around the inner conductor 1. The insulating layer 2 has a total of nine insulating winding structures. The first insulating layer adjacent to the inner conductor 1 is a polyimide film spiral winding structure, the second to fourth layers are polytetrafluoroethylene film spiral winding structures, the fifth layer is a polyimide film winding structure, the sixth to eighth layers are polytetrafluoroethylene film spiral winding structures, and the ninth layer is a polyimide film winding structure. The inner shielding layer 3 is covered on the insulating layer 2 by a silver-plated copper strip spiral winding structure, the outer shielding layer 4 is covered on the inner shielding layer 3 by a high-density silver-plated copper wire braided structure, the intermediate layer 5 is successively wound around the outer shielding layer 4 by a multi-layer polyimide film spiral winding structure, the high-temperature resistant adhesive layer uses a polyimide silicone film and is covered on the intermediate layer 5 in a spiral winding form, and the high-temperature resistant adhesive layer 6 is heat-melted and sealed on the intermediate layer 5 by a high-temperature heating method.
[0038] The first insulating layer adjacent to the inner conductor adopts a structure of spiral winding with polyimide film to achieve the purpose of blocking the temperature rise caused by heat transfer from the inner conductor. The second to fourth layers adopt a structure of spiral winding with polytetrafluoroethylene film with relatively low dielectric loss, which can effectively reduce the attenuation of the cable. The fifth insulating layer adopts a structure of spiral winding with polyimide film to play a role of high-temperature resistance support for the overall insulating layer and avoid the deformation of the insulating structure due to excessive temperature rise. The sixth to eighth layers also adopt a structure of spiral winding with polytetrafluoroethylene film with relatively low dielectric loss to further reduce the attenuation of the cable. The ninth insulating layer is adjacent to the inner shielding layer. Considering the temperature rise caused by heat transfer from the inner shielding layer, this layer also adopts a structure of spiral winding with polyimide film to achieve the purpose of blocking the temperature rise from the inner shielding layer.
[0039] Specifically, the polyimide film of the intermediate layer 5 is two layers, and here the polyimide film of the intermediate layer 5 is two layers.
[0040] The intermediate layer adopts a structure of spiral winding with two layers of polyimide film and covers the outer shielding layer. The outermost layer adopts a structure of spiral winding with polyimide silicone film and covers the intermediate layer. After high-temperature treatment, the polyimide silicone film is melted and sealed on the surface of the intermediate layer to form a three-layer reliable and tight high-temperature resistant outer protective layer, which effectively blocks the heat radiation from the high-temperature environment and further improves the high-temperature resistance characteristics of the cable.
[0041] Example 1
[0042] A high-temperature resistant radio frequency coaxial cable with a hybrid dielectric winding structure for the insulating and sheathing layers includes an inner conductor 1, an insulating layer 2, a shielding layer, and an outer protective layer 6 coaxially arranged from the inside out. The outer protective layer 6 is a high-temperature resistant adhesive layer. The insulating layer 2 covers the surface of the inner conductor 1 in the form of multi-layer spiral winding, and the multi-layer spiral winding is formed by alternately laminating multi-layers of polyimide film and multi-layers of polytetrafluoroethylene film; it further includes:
[0043] An intermediate layer 5 is arranged between the shielding layer and the high-temperature resistant adhesive layer 6, and the intermediate layer 5 covers the shielding layer in the form of multi-layer spiral winding with polyimide film, and the high-temperature resistant adhesive layer covers the intermediate layer 5.
[0044] Wherein:
[0045] For the cable with a combined insulation of polytetrafluoroethylene and polyimide in the insulating layer 2, a composite film of polytetrafluoroethylene film + polyimide film + polytetrafluoroethylene film is adopted. This composite film needs to be wound layer by layer first and then through a sintering process to compound the three-layer film materials into an integral film material.
[0046] This insulation processing technology will first add a sintering process, which reduces production efficiency. Secondly, for this kind of polytetrafluoroethylene thin film material, after high-temperature sintering, the air gaps inside will be squeezed out by the high temperature, increasing the dielectric constant of the material itself. When processed into a cable, its attenuation will be relatively large due to the previous high temperature. At the same time, the physical state of the film after high-temperature sintering will become hard, and the overall flexibility of the cable will be relatively poor.
[0047] Example 2
[0048] A high-temperature resistant radio frequency coaxial cable with an insulating and sheathing layer of a hybrid dielectric winding structure includes an inner conductor 1, an insulating layer 2, a shielding layer, and an outer sheath 6 coaxially arranged from the inside out. The outer sheath 6 is a high-temperature resistant adhesive layer. The insulating layer 2 covers the surface of the inner conductor 1 in the form of multi-layer spiral winding, and the multi-layer spiral winding is formed by alternating layers of polyimide thin films and multi-layers of polytetrafluoroethylene thin films; it further includes:
[0049] An intermediate layer 5, arranged between the shielding layer and the high-temperature resistant adhesive layer, and the intermediate layer 5 covers the shielding layer in the form of multi-layer spiral winding of polyimide thin films, and the high-temperature resistant adhesive layer covers the intermediate layer 5.
[0050] Among them: The insulating layer 2 covering the inner conductor 1 by spiral winding is formed by winding one layer of polyimide thin film and three layers of polytetrafluoroethylene thin films in a spiral manner;
[0051] The inner shielding layer is woven from silver-plated copper tape, the outer shielding layer is woven from silver-plated copper wire, the intermediate layer is formed by multi-layer spiral winding of polyimide thin films, and the high-temperature resistant adhesive layer is formed by spiral winding of polyimide silica gel film, and then the high-temperature resistant adhesive layer is cured on the surface of the intermediate layer by heating to form the outermost high-temperature resistant protective layer.
[0052] In the insulating layer of the second embodiment of the utility model, the insulating layer adjacent to the inner conductor is wound with polyimide thin film to block the high temperature brought by heat transfer from the inner conductor. The middle part of the insulating layer also adopts a polyimide thin film winding structure to support the entire insulating layer in a high-temperature environment. The insulating layer adjacent to the inner shielding layer also adopts a polyimide thin film winding structure to block the high temperature brought by heat transfer from the inner shielding layer. The insulating layer between the three layers of polyimide thin films all adopts a polytetrafluoroethylene thin film winding structure. This specific insulating structure design can, on the one hand, reduce the dielectric constant of the insulating medium and improve the electrical performance index of the cable, and on the other hand, effectively block the heat transfer from the inner conductor and the shielding layer, effectively protecting the internal polytetrafluoroethylene thin film medium and improving the temperature resistance and transmission characteristics of the cable.
[0053] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A high temperature resistant radio frequency coaxial cable having an insulation and sheath layer of a mixed dielectric wrapped structure, comprising an inner conductor (1), an insulation layer (2), a shielding layer and an outer sheath (6) coaxially arranged from inside to outside, characterized in that: The outer protective layer (6) is a high temperature resistant adhesive layer, the insulating layer (2) is covered on the surface of the inner conductor (1) in the form of a multi-layer spiral wrapping, and the multi-layer spiral wrapping is formed by alternately stacking a layer of polyimide film and a plurality of layers of polytetrafluoroethylene film; and further comprising: The middle layer (5) is arranged between the shielding layer and the high temperature resistant adhesive layer, and the middle layer (5) is covered on the shielding layer in the form of a multi-layer polyimide film spirally wrapped, and the high temperature resistant adhesive layer is covered on the middle layer (5).
2. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 1, characterized in that: The shielding layer comprises an inner shielding layer (3) and an outer shielding layer (4); the inner shielding layer (3) is covered on the insulating layer (2) in the form of a spiral wrapping, and the outer shielding layer (4) is covered on the intermediate layer (5) in the form of a braided mesh.
3. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 2, characterized in that: The inner conductor (1) and the outer shielding layer (4) are made of silver-plated copper wire.
4. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 2, characterized in that: The material of the inner shielding layer (3) is silver-plated copper tape.
5. The high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapped structure for the insulation and sheath layers according to claim 1, characterized in that: The high temperature resistant adhesive layer is covered on the middle layer (5) in a spirally wrapped form through an imide silicone film.
6. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 5, characterized in that: The high temperature resistant adhesive layer is heated and cured on the intermediate layer (5).
7. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 1, characterized in that: The insulating layer (2) spirally wrapped and covered on the inner conductor (1) is formed by spirally wrapping a layer of polyimide film and three layers of polytetrafluoroethylene film.
8. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 7, characterized in that: The number of winding layers of the spirally wound material of the insulating layer (2) is 7.
9. A high temperature resistant radio frequency coaxial cable with a mixed dielectric wrapping structure for the insulation and sheath layers according to claim 1, characterized in that: The polyimide film of the intermediate layer (5) consists of two layers.