Radio frequency stable-phase coaxial cable

Abstract

The utility model relates to the technical field of cables, and provides a radio frequency stable-phase coaxial cable, which comprises a conductor, an insulating layer, a first conductor layer and a first thermal insulation layer, the surface of the conductor is sequentially coated with the insulating layer, the first conductor layer and the first thermal insulation layer, and the first thermal insulation layer is a first aerogel film thermal insulation layer. According to the radio-frequency stable-phase coaxial cable, the first heat insulation layer is arranged to be the aerogel film layer, so that the normal working time of the cable at the extreme high temperature can be greatly prolonged, meanwhile, the weight of the radio-frequency stable-phase coaxial cable is reduced, and the applicability of the radio-frequency stable-phase coaxial cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a radio frequency stabilized coaxial cable. Background Art

[0002] RF-stable coaxial cables are mainly used to transmit microwave signals. They are cables that transmit electromagnetic energy in the radio frequency range and are indispensable components in various radio communication systems and electronic equipment. They are widely used in wireless communications, macro base stations, broadcasting, television, electronic tracking, military radar, direction-finding systems, guidance systems and other scenarios.

[0003] With the development of weapon equipment systems, the requirements for RF phase-stable coaxial cables are getting higher and higher. Traditional RF phase-stable cables cannot meet the short-term work in many high-temperature environments (such as above 450°C), which restricts the development of high-end weapon equipment. Utility Model Content

[0004] The utility model provides a radio frequency phase-stabilized coaxial cable, which is used to solve the defect that the radio frequency phase-stabilized cable in the prior art cannot work for a short period of time in a high temperature environment.

[0005] The utility model provides a radio frequency stabilized coaxial cable, comprising: a conductor, an insulating layer, a first conductor layer and a first thermal insulation layer, wherein the surface of the conductor is sequentially covered with the insulating layer, the first conductor layer and the first thermal insulation layer, and the first thermal insulation layer is a first aerogel film thermal insulation layer.

[0006] According to a radio frequency stable coaxial cable provided by the utility model, the first thermal insulation layer includes: a first aerogel film and a second aerogel film, and the first aerogel film and the second aerogel film are sequentially wrapped around the surface of the first conductor layer in forward and reverse directions.

[0007] According to a radio frequency stable coaxial cable provided by the utility model, the wrapping overlap rate of the first aerogel film and the second aerogel film is 40%-50%, and the wrapping overlap rate of the second aerogel film is greater than or equal to the wrapping overlap rate of the first aerogel film.

[0008] According to a radio frequency stable coaxial cable provided by the utility model, the first aerogel film insulation layer is a nano aerogel film insulation layer, an inorganic aerogel film insulation layer, an organic aerogel film insulation layer or a composite aerogel film insulation layer.

[0009] According to a radio frequency stable coaxial cable provided by the utility model, the conductor comprises a plurality of wires, each of the wires is plated with a silver layer on the outside, and the plurality of wires are twisted into the conductor; wherein the thickness of the silver layer is ≥7 μm.

[0010] According to a radio frequency stable coaxial cable provided by the utility model, the insulating layer comprises multiple layers of microporous polytetrafluoroethylene films, and the multiple layers of microporous polytetrafluoroethylene films are sequentially wrapped on the surface of the conductor in forward and reverse directions.

[0011] According to a radio frequency stable coaxial cable provided by the utility model, the first conductor layer is a silver-plated copper flat tape, and the silver-plated copper flat tape is wrapped around the surface of the insulating layer.

[0012] According to the utility model, a radio frequency stabilized coaxial cable also includes a second conductor layer, and the second conductor layer is coated on the surface of the first thermal insulation layer.

[0013] According to a radio frequency stable coaxial cable provided by the utility model, the second conductor layer includes a plurality of silver-plated copper conductors, and the plurality of silver-plated copper conductors are woven into the second conductor layer.

[0014] According to the utility model, a radio frequency stable coaxial cable also includes a second thermal insulation layer, which is coated on the surface of the second conductor layer, and the second thermal insulation layer is a second aerogel film thermal insulation layer.

[0015] The RF-stabilized coaxial cable provided by the utility model can greatly prolong the normal working time of the cable under extremely high temperatures by setting the first thermal insulation layer as an aerogel film layer. At the same time, the weight of the RF-stabilized coaxial cable is reduced, and the applicability of the RF-stabilized coaxial cable is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the radio frequency stabilized coaxial cable provided by the utility model.

[0018] Reference numerals:

[0019] 10. conductor; 20. insulating layer; 30. first conductor layer; 40. first thermal insulation layer; 50. second conductor layer; 60. second thermal insulation layer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The features of the terms "first" and "second" in the specification and claims of the utility model may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Combine the following Figure 1 The utility model is described as a radio frequency stabilized coaxial cable.

[0025] In the prior art, conventional RF-stabilized coaxial cables use silver-plated copper conductors, with microporous polytetrafluoroethylene wrapped around them to form an insulation layer. The conductor layer uses silver-plated copper flat tape, and the silver-plated copper wire is woven to form a shielding layer. The sheath layer is polytetrafluoroethylene. It can work for a long time in an environment of -55°C to 260°C, and for a short time in an environment of 300°C. It cannot work in an environment of 450°C or above.

[0026] Some RF-stabilized coaxial cables use silicon dioxide as the insulation layer, and the conductor layer uses stainless steel or annealed copper tube structure. This type of RF-stabilized coaxial cable can work in an environment of 450°C, but the use of silicon dioxide as the insulation layer is technically difficult and has high production costs. Semi-steel cables are not convenient for on-site wiring, and the wiring size must be determined in advance and the corresponding bending shape and length must be customized by the factory, which increases the difficulty of producing RF-stabilized coaxial cables.

[0027] Some RF-stabilized coaxial cables use synthetic mica tape as the insulation layer and glass fiber as the sheath layer. Although they can also work in a 450°C environment, the dielectric constant of the insulation layer of the RF-stabilized coaxial cable with this structure is relatively large. To meet the 50Ω impedance standard, the cable outer diameter is much larger than that of conventional cables. In addition, the dielectric loss of this material is relatively large, and the cable attenuation is also relatively large, so it can only work in low-frequency band equipment. The use of glass fiber sheath layer means that the RF-stabilized coaxial cable cannot be bent and wired at will.

[0028] Based on the above various RF co-axial cables, some cannot work for a long time in an environment of 450°C or above, while some can work for a long time in an environment of 450°C or above, but either the cost is high and not suitable for widespread use, or there are other shortcomings. Based on this, an embodiment of the utility model provides a RF co-axial cable that can work for a long time in an environment of 450°C or above and can solve the various problems existing in the above various RF co-axial cables.

[0029] like Figure 1 As shown, in an embodiment of the utility model, the RF-stabilized coaxial cable comprises: a conductor 10, an insulating layer 20, a first conductor layer 30 and a first thermal insulation layer 40. The surface of the conductor 10 is sequentially coated with the insulating layer 20, the first conductor layer 30 and the first thermal insulation layer 40, and the first thermal insulation layer 40 is a first aerogel film thermal insulation layer.

[0030] Specifically, in this embodiment, the first thermal insulation layer 40 is coated on the surface of the first conductor layer 30 with an aerogel film. The aerogel film is the lightest solid material with the best thermal insulation performance in the world. It has the characteristics of extremely low density, extremely low thermal conductivity and ultra-low hydrophobicity. Using the aerogel film as the first thermal insulation layer 40 can greatly extend the normal working time of the cable under extreme high temperature. At the same time, the aerogel film has an extremely low density, which can greatly reduce the weight of the cable, and is suitable for application scenarios with high weight requirements such as flying devices.

[0031] The RF-stabilized coaxial cable provided by the embodiment of the utility model can significantly extend the normal working time of the cable under extremely high temperatures by setting the first insulation layer as an aerogel film layer. At the same time, the weight of the RF-stabilized coaxial cable is reduced, and the applicability of the RF-stabilized coaxial cable is improved.

[0032] In the embodiment of the present invention, the first heat insulation layer 40 includes: a first aerogel film and a second aerogel film, and the first aerogel film and the second aerogel film are sequentially wrapped around the surface of the first conductor layer 30 .

[0033] Specifically, the first aerogel film and the second aerogel film are wrapped on the surface of the first conductor layer 30 in the form of two layers, that is, the wrapping directions of the first aerogel film and the second aerogel film are opposite, the first aerogel film is wrapped on the surface of the first conductor layer 30 in the positive direction (for example, clockwise), and the second aerogel film is wrapped on the surface of the first aerogel film in the reverse direction (for example, counterclockwise).

[0034] Optionally, the wrapping overlap ratio of the first aerogel film and the second aerogel film is 40%-50%, and the wrapping overlap ratio of the second aerogel film is greater than or equal to the wrapping overlap ratio of the first aerogel film. This design method can make the structure of the first and second aerogel films more stable, ensuring the high temperature protection effect of the first thermal insulation layer 40.

[0035] Optionally, in an embodiment of the utility model, the first aerogel film insulation layer may be a nano aerogel film insulation layer, an inorganic aerogel film insulation layer, an organic aerogel film insulation layer or a composite aerogel film insulation layer. Specifically, the inorganic aerogel film insulation layer may be a silica aerogel film insulation layer, an alumina aerogel film insulation layer, or a magnesium oxide aerogel film insulation layer; the organic aerogel film insulation layer may be a polyimide aerogel film insulation layer.

[0036] In the embodiment of the present invention, the conductor 10 includes a plurality of wires, each of which is plated with a silver layer on the outside, and the plurality of wires are twisted into the conductor 10 .

[0037] Specifically, in this embodiment, the conductor 10 is formed by twisting and pressing silver-plated copper wires, the cable arrangement is flexible, and can be installed and wired in a small space, so that the RF-stabilized coaxial cable can be suitable for a variety of application scenarios.

[0038] Optionally, in an embodiment of the present invention, the thickness of the silver-plated layer on the outside of each wire is ≥7 μm.

[0039] Optionally, in an embodiment of the present invention, the wire may also be a nickel-plated copper wire.

[0040] In the embodiment of the present invention, the insulating layer 20 includes multiple layers of microporous polytetrafluoroethylene films, which are sequentially wrapped on the surface of the conductor 10 in the positive and negative directions.

[0041] Specifically, in this embodiment, each layer of microporous polytetrafluoroethylene film can be 0.7g / cm3 Microporous polytetrafluoroethylene film, 0.5g / cm 3 Microporous polytetrafluoroethylene film.

[0042] In the embodiment of the present invention, the first conductor layer 30 is a silver-plated copper flat tape, and the silver-plated copper flat tape is wrapped around the surface of the insulating layer 20 .

[0043] Specifically, in this embodiment, the first conductor layer 30 is a silver-plated copper flat tape, wherein the thickness of the silver layer is ≥3 μm, and the silver-plated copper flat tape is wrapped around the outside of the insulating layer 20 in a wrapping manner, and the wrapping overlap rate is 40%-50%. It is worth noting that the first aerogel film in the first thermal insulation layer 40 close to the first conductor layer 30 is wrapped in the opposite direction to the silver-plated copper flat tape of the first conductor layer 30. This design method can offset part of the stress generated when the silver-plated copper flat tape of the first conductor layer 30 is wrapped in one direction, so as to improve the stability of the structure; the silver-plated copper flat tape in the first conductor layer 30 is wrapped in the opposite direction to the outermost polytetrafluoroethylene film in the insulating layer 20. This design method can offset part of the stress generated when the outermost polytetrafluoroethylene film of the insulating layer 20 is wrapped in one direction, so as to improve the stability of the structure.

[0044] The RF-stable coaxial cable provided by the embodiment of the utility model has a first conductor layer arranged as a structure wrapped with a silver-plated copper flat tape, with a wrapping coverage rate of 40%-50% and no gaps as a whole. Compared with the conventional silver-plated copper flat tape braided structure, the electromagnetic shielding performance of the cable is greatly improved, and good electromagnetic shielding performance can also be guaranteed when the cable is bent, so that the cable can be used at a frequency of up to 40 GHz.

[0045] like Figure 1 As shown, in the embodiment of the present invention, the RF-stabilized coaxial cable further includes a second conductor layer 50 , and the second conductor layer 50 is coated on the surface of the first thermal insulation layer 40 .

[0046] Specifically, the second conductor layer 50 includes multiple silver-plated copper conductors, each of which has a silver layer with a thickness of ≥2 μm. The multiple silver-plated copper conductors are coated on the surface of the first insulation layer 40 in the form of 16 or 24 spindles, and the weaving density is ≥85%.

[0047] like Figure 1 As shown, in an embodiment of the present invention, the RF-stabilized coaxial cable further includes a second thermal insulation layer 60, which is coated on the surface of the second conductor layer 50, and the second thermal insulation layer 60 is a second aerogel film thermal insulation layer.

[0048] Specifically, the second thermal insulation layer 60 is coated on the surface of the second conductor layer 50 with an aerogel film. The second thermal insulation layer 60 includes a third aerogel film and a fourth aerogel film. The third aerogel film and the fourth aerogel film are wrapped around the surface of the second conductor layer 60 .

[0049] Specifically, the third aerogel film and the fourth aerogel film are wrapped on the surface of the second conductor layer 50 in the form of two layers, that is, the wrapping directions of the third aerogel film and the fourth aerogel film are opposite, the third aerogel film is wrapped on the surface of the second conductor layer 50 in the positive direction (for example, clockwise), and the fourth aerogel film is wrapped on the surface of the third aerogel film in the reverse direction (for example, counterclockwise).

[0050] The wrapping overlap rate of the third aerogel film is 40%-50%, and the wrapping overlap rate of the fourth aerogel film is 40%-50%. Optionally, the wrapping overlap rate of the fourth aerogel film is greater than or equal to the wrapping overlap rate of the third aerogel film. This design method can make the third and fourth aerogel film structures more stable, ensuring the high temperature protection effect of the second insulation layer 60.

[0051] Optionally, in an embodiment of the utility model, the second aerogel film insulation layer may be a nano aerogel film insulation layer, an inorganic aerogel film insulation layer, an organic aerogel film insulation layer or a composite aerogel film insulation layer. Specifically, the inorganic aerogel film insulation layer may be a silica aerogel film insulation layer, an alumina aerogel film insulation layer, or a magnesium oxide aerogel film insulation layer; the organic aerogel film insulation layer may be a polyimide aerogel film insulation layer.

[0052] It should be noted that in the embodiment of the present invention, the materials of the aerogel films used in the first thermal insulation layer 40 and the second thermal insulation layer 60 may be the same or different.

[0053] The RF phase-stable coaxial cable provided by the embodiment of the utility model ensures that the RF phase-stable cable can work normally for a long time in an environment of 450°C or above, and ensures that the internal structure of the RF phase-stable cable remains stable and does not melt, by setting the first insulation layer and the second insulation layer as four layers of aerogel film, and every two layers of aerogel film adopt a positive and negative winding structure. At the same time, the RF phase-stable coaxial cable provided by the embodiment of the utility model has good flexibility and light weight, and can be arbitrarily wired according to usage conditions, thereby improving the convenience of construction.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A radio frequency stabilized coaxial cable, characterized in that: include: A conductor, an insulating layer, a first conductor layer and a first thermal insulation layer. The surface of the conductor is sequentially covered with the insulating layer, the first conductor layer and the first thermal insulation layer. The first thermal insulation layer is a first aerogel film thermal insulation layer.

2. The radio frequency stabilized coaxial cable according to claim 1, characterized in that: The first heat-insulating layer comprises: a first aerogel film and a second aerogel film, and the first aerogel film and the second aerogel film are sequentially wrapped around the surface of the first conductor layer in front and back directions.

3. The radio frequency stabilized coaxial cable according to claim 2, characterized in that: The wrapping overlap ratio of the first aerogel film and the second aerogel film is 40%-50%, and the wrapping overlap ratio of the second aerogel film is greater than or equal to the wrapping overlap ratio of the first aerogel film.

4. The radio frequency stabilized coaxial cable according to claim 1, characterized in that: The first aerogel film insulation layer is a nano aerogel film insulation layer, an inorganic aerogel film insulation layer, an organic aerogel film insulation layer or a composite aerogel film insulation layer.

5. The radio frequency stabilized coaxial cable according to claim 1, characterized in that: The conductor comprises a plurality of wires, each of which is plated with a silver layer on the outside, and the plurality of wires are twisted into the conductor; wherein the thickness of the silver layer is ≥7 μm.

6. The radio frequency stabilized coaxial cable according to claim 1, characterized in that: The insulating layer comprises multiple layers of microporous polytetrafluoroethylene films, and the multiple layers of microporous polytetrafluoroethylene films are sequentially wrapped on the surface of the conductor in both positive and negative directions.

7. The radio frequency stabilized coaxial cable according to claim 1, characterized in that: The first conductor layer is a silver-plated copper flat tape, and the silver-plated copper flat tape is wrapped around the surface of the insulating layer.

8. The radio frequency stabilized coaxial cable according to claim 1, characterized in that: It also includes a second conductor layer, which is coated on the surface of the first heat insulation layer.

9. The radio frequency stabilized coaxial cable according to claim 8, characterized in that: The second conductor layer includes a plurality of silver-plated copper conductors, and the plurality of silver-plated copper conductors are braided to form the second conductor layer.

10. The radio frequency stabilized coaxial cable according to claim 8, characterized in that: It also includes a second thermal insulation layer, which is coated on the surface of the second conductor layer, and is a second aerogel film thermal insulation layer.

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