High temperature resistant radio frequency coaxial cable

Abstract

The utility model discloses a high-temperature-resistant radio frequency coaxial cable, and belongs to the technical field of communication. The center of the high-temperature-resistant radio-frequency coaxial cable is provided with an inner conductor, the surface of the inner conductor is provided with an inorganic matter net serving as an insulating layer, the inorganic matter net is wrapped on the inner conductor, the outer surface of the inorganic matter net is provided with a first conductor layer, and the outer surface of the first conductor layer is provided with a second conductor layer. And the inorganic substance net is spirally lapped on the surface of the inner conductor for multiple times. And the inner conductor is made of a nickel-silicon alloy material. The first conductor layer is made of a seamless red copper tube, and the seamless red copper tube is an integrally formed tube body. According to the high-temperature-resistant radio-frequency coaxial cable provided by the invention, the problem of cable failure caused by falling off of an oxide layer and sudden increase of insertion loss is avoided, the transmission rate of the cable can be improved, and the insertion loss of the cable is reduced.

Description

Technical Field

[0001] The utility model relates to the field of communication technologies, and particularly relates to a high-temperature resistant radio frequency coaxial cable. Background Art

[0002] With the development of communication technologies, conventional cables can no longer meet the usage requirements of some special environments. Especially under extreme high-temperature environmental conditions, the inner conductors of current conventional high-temperature resistant radio frequency coaxial cables use silver-plated copper wires or silver-plated copper-clad steel wires. These materials generate oxide layers at 400°C, which easily cause the oxide layers to peel off from the coated copper material. The insulating layer uses polytetrafluoroethylene (PTFE) material, and the maximum temperature resistance of PTFE material is only 260°C. The conventional materials used for the sheath layer are perfluoroethylene propylene (FEP), soluble polytetrafluoroethylene (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), and cross-linked ethylene and tetrafluoroethylene copolymer (X-ETFE) materials. The long-term service temperature of these several insulating layer materials is 200°C to 260°C, and the maximum service temperature of ordinary insulating layer materials does not exceed 260°C.

[0003] Due to the skin effect, electrical signals do not conduct uniformly through the inner conductor but through the surface of the inner conductor. The bulk resistance of silver is much lower than that of copper. After the silver layer peels off, the electrical signals conduct from the surface of the copper material, resulting in an increase in the insertion loss of the cable assembly or the failure of the cable assembly. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the problems in the prior art and provide a high-temperature resistant radio frequency coaxial cable that will not have the problems of oxide layer peeling off and sudden increase in insertion loss leading to cable failure, and can improve the cable transmission rate and reduce the cable insertion loss.

[0005] The utility model provides a high-temperature resistant radio frequency coaxial cable with an inner conductor in the center. The material of the inner conductor is a nickel-silicon alloy material. An inorganic network serving as an insulating layer is provided on the surface of the inner conductor. The inorganic network is wound around the inner conductor, and a first conductor layer is provided on the outer surface of the inorganic network, and a second conductor layer is provided on the outer surface of the first conductor layer.

[0006] When the inorganic braided network is wound, grid-like voids will be formed in the insulating layer, which can effectively reduce the dielectric constant of the cable, improve the cable transmission rate, reduce the cable insertion loss, and has a smaller dielectric constant compared with the conventional inorganic powder filling technology, with a transmission rate as high as 70%, making the cable have an extremely low attenuation constant.

[0007] Preferably, the winding density of the inorganic network on the inner conductor is greater than or equal to 95%, for example, 96% and 97%, etc., to enhance the shielding effect of the radio frequency coaxial cable.

[0008] Preferably, the inner conductor is formed by stranding 19 single wires, each of the single wires having the same diameter. From the inside out, the single wires are divided into one, six, and twelve.

[0009] Specifically, each single wire has the same diameter. From the inside out, the inner conductor 1 is divided into 1 single wire in the middle, 6 single wires outside this single wire, and 12 single wires outside these 6 single wires, totaling 19. Each single wire is a nickel-silicon alloy wire, and the diameter of each single wire is 0.1 mm to 0.6 mm. Preferably, a nickel-silicon alloy wire with a diameter of 0.3 mm is selected, and the inner conductor is obtained by stranding in the same direction and then forming and clamping in one step.

[0010] The inner conductor formed by stranding and clamping 19 single wires has an attenuation performance close to 97% of that of a single conductor compared with a traditional single conductor, but its bending and fracture resistance performance is greatly improved.

[0011] Preferably, the material of the inorganic network of the insulating layer is alkali-free glass fiber cloth, glass fiber felt, asbestos paper, or cellulose paper, and the insulating layer material uses one or more of the above.

[0012] Preferably, the inorganic network is helically wound around the surface of the inner conductor multiple times, so as to form grid-like voids in the insulating layer, which can effectively reduce the dielectric constant of the cable, improve the cable transmission rate, reduce the cable insertion loss, and has a smaller dielectric constant compared with the conventional inorganic powder filling technology, with a transmission rate up to 70%, making the cable have an extremely low attenuation constant.

[0013] Preferably, the material of the first conductor layer is seamless copper tube, and the seamless copper tube is an integrally formed tube body.

[0014] The copper tube is beneficial for transmitting electrical signals. The first conductor layer uses a seamless copper tube, which can not only ensure a low attenuation constant and minimum outer conductor loss of the cable, but also be suitable for various occasions with narrow spaces.

[0015] Preferably, the material of the second conductor layer is stainless steel tube, and the stainless steel tube is an integrally formed tube body.

[0016] The second conductor uses a stainless steel tube, which can protect the entire internal structure of the cable. It can protect the first conductor of the cable from generating an oxide layer in an environment below 1000 °C, effectively enhance the strength of the cable, and have an anti-corrosion ability, further preventing problems such as electrical property mutation and failure, and effectively protecting the cable to work normally at high temperatures. The material of the stainless steel tube is 304 stainless steel or 301 stainless steel.

[0017] Preferably, the wall thickness of the inorganic network is 0.07 mm to 0.12 mm, and preferably 0.10 mm.

[0018] Preferably, the pitch of the stranding of the plurality of single wires ranges from 12 mm to 25 mm, preferably 15 mm. With the above settings, the problem of high-frequency fixed peaks can be solved, and stable standing waves can be achieved.

[0019] Preferably, the dielectric constant of the insulating layer ranges from 2.20 to 2.30, such as 2.25.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] For the inner conductor of the high-temperature resistant radio frequency coaxial cable of the present utility model, a nickel-silicon alloy is selected. The nickel-silicon alloy can maintain good strength and stability under high temperature and high pressure, has excellent oxidation resistance, a small resistivity, will not generate an oxide layer in a high-temperature environment, and will not have the oxide layer fall off due to an extremely high-temperature use environment. At the same time, for the insulating layer, an inorganic mesh that can withstand a higher temperature than organic materials is selected. Through the synchronous optimization of the inner conductor and the insulating layer, the overall high-temperature resistance and oxidation resistance of the high-temperature resistant radio frequency coaxial cable are realized, avoiding the problem that the insertion loss suddenly becomes large or even causes the cable to fail, and more importantly, avoiding the problem that the inner and outer conductors are electrically connected due to the oxide layer falling off when the cable cools from a high temperature to a normal temperature, further causing the cable to fail.

[0022] At the same time, the insulating layer of the present utility model is woven from inorganic materials. When the inorganic woven mesh is wound, grid-like voids will be formed in the insulating layer, which can effectively reduce the dielectric constant of the cable, improve the cable transmission rate, reduce the cable insertion loss, and has a smaller dielectric constant compared with the conventional inorganic powder filling technology, with a transmission rate as high as 70%, making the cable have an extremely low attenuation constant. The high-temperature resistant radio frequency coaxial cable of the present utility model can be used in occasions and fields that require radio frequency signal transmission and have high stability requirements under high-temperature or extremely high-temperature environments, such as aerospace, phased array radar, satellite communication, and instrumentation. Description of the Drawings

[0023] Figure 1 is a three-dimensional view of the present utility model;

[0024] Figure 2 is an end cross-sectional view of the present utility model.

[0025] Description of the Reference Numerals:

[0026] 1. Inner conductor, 2. Inorganic mesh, 3. First conductor layer, 4. Second conductor. Detailed Embodiments

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model belongs. Words such as "including" or "comprising" and the like mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. "Inner", "outer", "upper", "lower", "far", "near", "front", "rear", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] The accompanying drawings in this disclosure are not strictly drawn to actual scale, and the specific dimensions and quantities of each structure can be determined according to actual needs. The accompanying drawings described in this disclosure are only schematic diagrams of the structures.

[0030] The high-temperature resistant radio frequency coaxial cable provided by the present utility model has an inner conductor 1 in the center, such as Figures 1 to 2 the material of the inner conductor 1 is made of nickel-silicon alloy material, an inorganic network 2 serving as an insulating layer is provided on the surface of the inner conductor 1, the inorganic network 2 is wound around the inner conductor 1, a first conductor layer 3 is provided on the outer surface of the inorganic network 2, and a second conductor layer 4 is provided on the outer surface of the first conductor layer 3.

[0031] The nickel-silicon alloy material, by mass percentage, includes: Ni is 3.5% - 4.0%, Si is 0.7% - 0.9%, Mg is 0.07% - 0.15%, rare earth elements are 0.09% - 0.16%, Zr is 0.07% - 0.15%, and the balance is Cu and inevitable impurities. For details, refer to the existing patent technology with the publication number CN116732384A. The inner conductor of the high-temperature resistant radio frequency coaxial cable of the present utility model selects the nickel-silicon alloy. The nickel-silicon alloy can maintain good strength and stability under high temperature and high pressure, has excellent oxidation resistance, a small resistivity, will not generate an oxide layer in a high-temperature environment, and will not have the oxide layer peeling off due to an extremely high-temperature use environment. At the same time, the insulating layer selects an inorganic network that can withstand higher temperatures compared to organic materials. Through the synchronous optimization of the inner conductor and the insulating layer, the present utility model realizes the overall high-temperature resistance and oxidation resistance of the high-temperature resistant radio frequency coaxial cable, avoids the problem that the insertion loss suddenly becomes large or even causes the cable to fail, and will not cause the inner and outer conductors to conduct due to the oxide layer peeling off when the cable cools from high temperature to normal temperature, and further cause the cable to fail.

[0032] At the same time, the insulating layer of the present utility model is woven from inorganic substances. When the inorganic woven mesh is wrapped, grid-shaped voids will be formed in the insulating layer, which can effectively reduce the dielectric constant of the cable, improve the cable transmission rate, reduce the cable insertion loss, and has a smaller dielectric constant compared to the conventional inorganic powder filling technology. The transmission rate is as high as 70%, making the cable have an extremely low attenuation constant. The high-temperature resistant radio frequency coaxial cable of the present utility model can be used in high-temperature or extremely high-temperature environments, occasions and fields where radio frequency signal transmission and high stability requirements are needed, such as aerospace, phased array radar, satellite communication, and instrumentation and other fields.

[0033] In this embodiment, the winding density of the inorganic network 2 on the inner conductor 1 is greater than or equal to 95%, for example, 96% and 97%, etc., to enhance the shielding effect of the radio frequency coaxial cable.

[0034] In this embodiment, the inner conductor 1 is stranded by 19 single wires, and the diameter of each single wire is the same. From the inside out, the single wires are divided into one, six, and twelve.

[0035] Specifically, the diameter of each single wire is the same. From the inside out, the inner conductor 1 is divided into 1 single wire in the middle, 6 single wires outside this single wire, and 12 single wires outside these 6 single wires, totaling 19. Each single wire is a nickel-silicon alloy wire, and the diameter of each single wire is 0.1 mm - 0.6 mm. Preferably, a nickel-silicon alloy wire with a diameter of 0.3 mm is selected, and the inner conductor 1 is obtained by stranding in the same direction and then forming and tightening in one step.

[0036] The single wire in the middle does not need to be stranded. Six single wires are stranded outside the single wire in the middle, and then the 12 single wires on the outermost side are stranded. The inner conductor 1 formed by stranding and tightly pressing 19 single wires has an attenuation performance close to 97% of that of a single conductor compared with the traditional single conductor, but its bending and fracture resistance performance is greatly improved.

[0037] In this embodiment, the material of the inorganic network of the insulating layer is alkali-free glass fiber cloth, glass fiber felt, asbestos paper or cellulose paper, and the insulating layer material adopts one or more of the above.

[0038] In this embodiment, as Figure 1 The inorganic network 2 is helically wound around the surface of the inner conductor 1 for multiple times, so as to form grid-like voids in the insulating layer, which can effectively reduce the dielectric constant of the cable, improve the cable transmission rate, reduce the cable insertion loss, and has a smaller dielectric constant compared with the conventional inorganic powder filling technology, and the transmission rate is as high as 70%, making the cable have an extremely low attenuation constant.

[0039] In this embodiment, as Figures 1 to 2 The material of the first conductor layer 3 is seamless copper tube, and the seamless copper tube is an integrally formed tube body.

[0040] The copper tube is beneficial to transmitting electrical signals. The first conductor layer adopts a seamless copper tube, which can not only ensure a lower attenuation constant and the minimum outer conductor loss of the cable, but also be suitable for various occasions with narrow spaces.

[0041] In this embodiment, as Figures 1 to 2 The material of the second conductor layer 4 is stainless steel tube, and the stainless steel tube is integrally formed.

[0042] The second conductor adopts a stainless steel tube, which can protect the entire internal structure of the cable. It can protect the first conductor of the cable from generating an oxide layer in an environment below 1000°C, can also effectively enhance the strength of the cable, and has an anti-corrosion ability, further preventing problems such as electrical property mutation and failure, and effectively protecting the cable to work normally at high temperatures. The material of the stainless steel tube is 304 stainless steel or 301 stainless steel.

[0043] In this embodiment, the wall thickness of the inorganic network 2 is 0.07 mm to 0.12 mm, preferably 0.10 mm.

[0044] In this embodiment, the stranding pitch of the multiple single wires ranges from 12 mm to 25 mm, preferably 15 mm. Through the above settings, the problem of high-frequency fixed peaks can be solved and the standing wave can be stabilized.

[0045] In this embodiment, the dielectric constant of the insulating layer ranges from 2.20 to 2.30, for example 2.25.

[0046] The outer conductor of this high-temperature resistant RF coaxial cable adopts a fully enclosed structure, so the cable has optimal shielding efficiency, minimum outer conductor loss, a relatively high operating frequency band range, and good electrical performance indicators across the entire frequency band; it also has strong tensile strength and bend formability. Since the insulating layer material uses inorganic materials, the problem of the cable being used normally in a high-temperature environment is solved. This cable can be used in high-temperature or extremely high-temperature environments where RF signal transmission is required, as well as in occasions and fields with relatively high stability requirements, such as aerospace, phased array radar, satellite communication, and instrumentation.

[0047] The above shows and describes the basic principles, main features, and advantages of the present utility model. Technical personnel in this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by 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 inner conductor (1) at the center, characterized in that: The inner conductor (1) is made of a nickel-silicon alloy material; an inorganic net (2) serving as an insulating layer is provided on the surface of the inner conductor (1); the inorganic net (2) is wrapped around the inner conductor (1); a first conductor layer (3) is provided on the outer surface of the inorganic net (2); and a second conductor layer (4) is provided on the outer surface of the first conductor layer (3).

2. The high temperature resistant radio frequency coaxial cable according to claim 1, characterized in that: The wrapping density of the inorganic net (2) on the inner conductor (1) is greater than or equal to 95%.

3. The high temperature resistant radio frequency coaxial cable according to claim 1, characterized in that: The inner conductor (1) is formed by twisting 19 single wires, each of which has the same diameter, and the number of single wires from the inside to the outside is one, six, or twelve.

4. The high temperature resistant radio frequency coaxial cable according to claim 1, characterized in that: The inorganic net of the insulating layer is made of alkali-free glass fiber cloth, glass fiber felt, asbestos paper or cellulose paper.

5. The high temperature resistant radio frequency coaxial cable according to claim 1, characterized in that: The inorganic net (2) is spirally wrapped multiple times on the surface of the inner conductor (1).

6. A high temperature resistant radio frequency coaxial cable as claimed in claim 1, characterized in that: The first conductor layer (3) is made of a seamless copper tube, which is an integrally formed tube body.

7. A high temperature resistant radio frequency coaxial cable as claimed in claim 1, characterized in that: The material of the second conductor layer (4) is a stainless steel tube, which is an integrally formed tube body.

8. The high temperature resistant radio frequency coaxial cable according to claim 1, characterized in that: The wall thickness of the inorganic net (2) is 0.07 mm to 0.12 mm.

9. The high temperature resistant radio frequency coaxial cable according to claim 3, characterized in that: The twisting pitch of the plurality of single wires ranges from 12 mm to 25 mm.

10. The high temperature resistant radio frequency coaxial cable according to claim 1, characterized in that: The dielectric constant of the insulating layer ranges from 2.20 to 2.30.

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