Coaxial cable

Abstract

The invention provides a coaxial cable which comprises an inner conductor, an insulating layer, an outer conductor, a protective layer, a shielding layer and a sheath which are sequentially and coaxially arranged from inside to outside, the insulating layer wraps the outer surface of the inner conductor, the outer conductor wraps the outer surface of the insulating layer, the protective layer wraps the outer surface of the outer conductor, and the shielding layer wraps the outer surface of the outer conductor. The shielding layer wraps the outer surface of the protection layer, the sheath wraps the outer surface of the shielding layer, compared with the prior art, the protection layer is additionally arranged between the outer conductor and the shielding layer, friction between the shielding layer and the outer conductor can be avoided when the coaxial cable is bent, and the coaxial cable can be prevented from being damaged. In other words, friction protection is carried out on the shielding layer through the protection layer, so that the situation that the shielding performance is reduced due to the fact that surface metal of the shielding layer falls off due to friction between the shielding layer and the outer conductor is reduced or even avoided, and the service life of the coaxial cable is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of cables, and specifically relates to a coaxial cable. Background Art

[0002] Low-loss and phase-stable radio frequency coaxial cables are widely used in phased array radars, satellite and missile monitoring, and electronic systems with strict weight requirements. They have very important applications in the transmission of radio frequency signals between various radio equipment. As an important basic passive device for transmitting microwave signals in airborne equipment, low-loss and phase-stable radio frequency coaxial cables are required to have low loss, low return loss, high phase stability, and greater power handling capacity, so as to ensure the highly reliable transmission of signals of electronic equipment in harsh environments.

[0003] In the prior art, low-loss and phase-stable radio frequency coaxial cables are usually formed by sequentially wrapping an inner conductor, an insulating layer, an outer conductor, a shielding layer, and a sheath. When such a cable encounters a bending scenario, during the bending process of the cable, the outer conductor will rub against the shielding layer, which will cause the surface metal of the shielding layer to fall off due to friction, thereby reducing the shielding performance and shortening the service life of the cable. Summary of the Invention

[0004] This application mainly provides a coaxial cable that can increase the service life of the coaxial cable.

[0005] To solve the above technical problems, a technical solution adopted in this application is: providing a coaxial cable, which includes an inner conductor, an insulating layer, an outer conductor, a protective layer, a shielding layer, and a sheath that are coaxially arranged from the inside out in sequence. The insulating layer covers the outer surface of the inner conductor, the outer conductor covers the outer surface of the insulating layer, the protective layer covers the outer surface of the outer conductor, the shielding layer covers the outer surface of the protective layer, and the sheath covers the outer surface of the shielding layer.

[0006] In a specific embodiment, the protective layer is formed by winding a low-density polytetrafluoroethylene tape.

[0007] In a specific embodiment, the width of the protective layer is 0.5 mm to 2 mm, the thickness is 0.03 mm to 0.1 mm, and the winding overlap rate is 20% to 50%.

[0008] In a specific embodiment, the outer conductor is formed by winding multiple silver-plated copper tapes.

[0009] In a specific embodiment, the number of silver-plated copper tapes is 4 to 12, the width is 0.5 mm to 2 mm, the thickness is 0.03 mm to 0.1 mm, and the winding overlap rate is 20% to 50%.

[0010] In a specific embodiment, the inner conductor is one of a silver-plated copper-clad aluminum Bell conductor, a silver-plated copper-clad aluminum magnesium alloy, a silver-plated copper-clad steel single-core conductor, or a stranded conductor.

[0011] In a specific embodiment, the diameter of the inner conductor is 0.5 mm to 3.0 mm, the thickness of the silver plating layer is 3 μm to 10 μm, and the volume ratio of the copper layer is 10% to 20%.

[0012] In a specific embodiment, the insulating layer is formed by winding a low-density polytetrafluoroethylene tape, and the diameter of the insulating layer is 1.4 mm to 9 mm.

[0013] In a specific embodiment, the shielding layer is woven from a metallized polymer fiber material, the number of spindles of the knitting machine is 16 to 32, and the outer diameter of the shielding layer after knitting is 1.8 mm to 9.6 mm.

[0014] In a specific embodiment, the material of the sheath is one of FEP, PFA, and ETFE.

[0015] The beneficial effect of this application is: Different from the prior art, the coaxial cable provided by this application includes an inner conductor, an insulating layer, an outer conductor, a protective layer, a shielding layer, and a sheath that are coaxially arranged in sequence from the inside out. The insulating layer covers the outer surface of the inner conductor, the outer conductor covers the outer surface of the insulating layer, the protective layer covers the outer surface of the outer conductor, the shielding layer covers the outer surface of the protective layer, and the sheath covers the outer surface of the shielding layer. Through this setting method, compared with the prior art, a protective layer is added between the outer conductor and the shielding layer, so that when the coaxial cable is bent, the shielding layer will not rub against the outer conductor, that is, the shielding layer is friction-protected by the protective layer, reducing or even avoiding the situation where the surface metal of the shielding layer falls off due to the friction between the shielding layer and the outer conductor, thereby reducing the shielding performance and increasing the service life of the coaxial cable. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the coaxial cable provided by this application; Specific Embodiments

[0018] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be specifically noted that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only partial embodiments of the present application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0019] The terms "first", "second", and "third" in the present application are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0020] Referring to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0021] Please refer to Figure 1 , Figure 1It is a schematic structural diagram of an embodiment of the coaxial cable 10 provided by the present application. In this embodiment, the coaxial cable 10 includes an inner conductor 11, an insulating layer 12, an outer conductor 13, a protective layer 14, a shielding layer 15, and a sheath 16, which are coaxially arranged from the inside out in sequence. The insulating layer 12 is coated on the outer surface of the inner conductor 11, the outer conductor 13 is coated on the outer surface of the insulating layer 12, the protective layer 14 is coated on the outer surface of the outer conductor 13, the shielding layer 15 is coated on the outer surface of the protective layer 14, and the sheath 16 is coated on the outer surface of the shielding layer 15. Through this setting method, compared with the prior art, a protective layer 14 is added between the outer conductor 13 and the shielding layer 15, so that when the coaxial cable 10 is bent, the shielding layer 15 will not rub against the outer conductor 13, that is, the shielding layer 15 is friction-protected by the protective layer 14, reducing or even avoiding the situation that the surface metal of the shielding layer 15 falls off due to the friction between the shielding layer 15 and the outer conductor 13, thereby reducing the shielding performance and increasing the service life of the coaxial cable 10.

[0022] Among them, the inner conductor 11 is one of a silver-plated copper-clad aluminum Bell conductor, a silver-plated copper-clad aluminum magnesium alloy, a silver-plated copper-clad steel single-core conductor, or a stranded conductor.

[0023] Since the transmission signal frequency of the inner conductor 11 is usually high, due to the skin effect, the transmission signal usually only passes through the surface thin layer of the inner conductor 11, and the higher the frequency, the more obvious the skin effect. Therefore, copper-clad aluminum with a silver-plated surface is used to reduce the resistance and weight.

[0024] Optionally, the diameter of the inner conductor 11 is 0.5 mm to 3.0 mm, the thickness of the silver-plated layer is 3 μm to 10 μm, and the volume ratio of the copper layer is 10% to 20%.

[0025] Optionally, the insulating layer 12 is wound with a low-density polytetrafluoroethylene tape, and the diameter of the insulating layer 12 is 1.4 mm to 9 mm.

[0026] Furthermore, the outer conductor 13 is wound with multiple silver-plated copper tapes. Through this setting method, compared with the outer conductor 13 wound with a single silver-plated copper tape, the winding pitch can be increased, making the outer conductor 13 softer, avoiding the risk of breakage of the coaxial cable 10 due to the hardness of the outer conductor 13 when the coaxial cable 10 is bent, especially when bent multiple times, and increasing the service life of the coaxial cable 10.

[0027] Optionally, the number of silver-plated copper tapes is 4 to 12, the width is 0.5 mm to 2 mm, the thickness is 0.03 mm to 0.1 mm, and the winding overlap rate is 20% to 50.

[0028] Furthermore, the protective layer 14 is formed by winding with a low-density polytetrafluoroethylene tape. When the coaxial cable 10 bends, the friction resistance between the protective layer 14 and the shielding layer 15 is smaller than the metal-to-metal friction between the outer conductor 13 and the shielding layer 15, effectively reducing the risk of the surface metal of the shielding layer 15 peeling off due to friction.

[0029] Optionally, the width of the protective layer 14 is 0.5 mm to 2 mm, the thickness is 0.03 mm to 0.1 mm, and the winding overlap rate is 20% to 50%.

[0030] Furthermore, the shielding layer 15 is woven from a metallized polymer fiber material. The number of spindles of the weaving machine is 16 to 32, and the outer diameter of the woven shielding layer 15 is 1.8 mm to 9.6.

[0031] Optionally, the polymer in the metallized polymer fiber is one of aramid 1414, aramid 1313, Vectran, Zylon, Ekonol, Xydar, PBI, PI, PEEK, and the surface metallized coating of the metallized polymer fiber is one or a combination of silver, copper, and nickel.

[0032] Furthermore, the material of the sheath 16 is one of FEP, PFA, and ETFE.

[0033] Wherein, the outer diameter of the coaxial cable 10 after the sheath is 2.7 mm to 11.4 mm.

[0034] In the coaxial cable 10 of this embodiment, on the one hand, by adding the protective layer 14 between the outer conductor 13 and the shielding layer 15, when the coaxial cable 10 bends, the shielding layer 15 will not rub against the outer conductor 13, reducing or even avoiding the situation where the surface metal of the shielding layer 15 peels off due to friction with the outer conductor 13, thereby reducing the shielding performance and increasing the service life of the coaxial cable 10; on the other hand, the conductor 13 is formed by winding multiple silver-plated copper tapes. Compared with the outer conductor 13 formed by winding a single silver-plated copper tape, the winding pitch can be increased, making the outer conductor 13 softer and avoiding the risk of the coaxial cable 10 breaking due to the hardness of the outer conductor 13 when bending, especially when bending multiple times, increasing the service life of the coaxial cable 10.

[0035] The beneficial effects of the present application are as follows: Different from the prior art, the coaxial cable provided by the present application includes an inner conductor, an insulating layer, an outer conductor, a protective layer, a shielding layer, and a sheath that are coaxially arranged in sequence from the inside out. The insulating layer is coated on the outer surface of the inner conductor, the outer conductor is coated on the outer surface of the insulating layer, the protective layer is coated on the outer surface of the outer conductor, the shielding layer is coated on the outer surface of the protective layer, and the sheath is coated on the outer surface of the shielding layer. Through this setting method, compared with the prior art, a protective layer is added between the outer conductor and the shielding layer, which can prevent the shielding layer from rubbing against the outer conductor when the coaxial cable is bent. That is, the protective layer provides friction protection for the shielding layer, reducing or even avoiding the situation where the surface metal of the shielding layer falls off due to friction with the outer conductor, thereby reducing the shielding performance and increasing the service life of the coaxial cable.

[0036] The above are only some embodiments of the present application, and thus do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A coaxial cable, characterized in that, The coaxial cable includes an inner conductor, an insulating layer, an outer conductor, a protective layer, a shielding layer and a sheath which are coaxially arranged from inside to outside in sequence. The insulating layer covers the outer surface of the inner conductor, the outer conductor covers the outer surface of the insulating layer, the protective layer covers the outer surface of the outer conductor, the shielding layer covers the outer surface of the protective layer, and the sheath covers the outer surface of the shielding layer.

2. The coaxial cable according to claim 1, characterized in that, The protective layer is formed by winding a low-density polytetrafluoroethylene tape.

3. The coaxial cable according to claim 2, characterized in that, The width of the protective layer is 0.5 mm to 2 mm, the thickness is 0.03 mm to 0.1 mm, and the winding overlap rate is 20% to 50%.

4. The coaxial cable according to claim 1, wherein, The outer conductor is formed by winding a plurality of silver-plated copper tapes.

5. The coaxial cable according to claim 4, characterized in that, The number of the silver-plated copper tapes is 4 to 12, the width is 0.5 mm to 2 mm, the thickness is 0.03 mm to 0.1 mm, and the winding overlap rate is 20% to 50%.

6. The coaxial cable according to claim 1, characterized in that, The inner conductor is one of a silver-plated copper-clad aluminum Bell conductor, a silver-plated copper-clad aluminum magnesium alloy, a silver-plated copper-clad steel single-core conductor or a stranded conductor.

7. The coaxial cable according to claim 6, characterized in that, The diameter of the inner conductor is 0.5 mm to 3.0 mm, the thickness of the silver-plated layer is 3 μm to 10 μm, and the volume ratio of the copper layer is 10% to 20%.

8. The coaxial cable according to claim 1, characterized in that, The insulating layer is formed by winding a low-density polytetrafluoroethylene tape, and the diameter of the insulating layer is 1.4 mm to 9 mm.

9. The coaxial cable according to claim 1, wherein, The shielding layer is woven from a metallized polymer fiber material, the number of spindles of the knitting machine is 16 to 32, and the outer diameter of the woven shielding layer is 1.8 mm to 9.6 mm.

10. The coaxial cable according to claim 1, characterized in that, The material of the sheath is one of FEP, PFA, and ETFE.

Images