CN220962889U - Radio frequency coaxial cable - Google Patents
Radio frequency coaxial cable Download PDFInfo
- Publication number
- CN220962889U CN220962889U CN202322529538.9U CN202322529538U CN220962889U CN 220962889 U CN220962889 U CN 220962889U CN 202322529538 U CN202322529538 U CN 202322529538U CN 220962889 U CN220962889 U CN 220962889U
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- China
- Prior art keywords
- layer
- insulating layer
- coaxial cable
- radio frequency
- shielding layer
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- 239000004020 conductor Substances 0.000 claims abstract description 29
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 238000009954 braiding Methods 0.000 claims description 14
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 10
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 10
- 229920001903 high density polyethylene Polymers 0.000 claims description 6
- 239000004700 high-density polyethylene Substances 0.000 claims description 6
- 229920001684 low density polyethylene Polymers 0.000 claims description 6
- 239000004702 low-density polyethylene Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000003989 dielectric material Substances 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 97
- 230000005540 biological transmission Effects 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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- Communication Cables (AREA)
- Insulated Conductors (AREA)
Abstract
The utility model provides a radio frequency coaxial cable. The radio frequency coaxial cable includes: the inner conductor, the insulating layer, the outer conductor and the shielding structure are coaxially arranged from inside to outside in sequence, the shielding structure comprises an inner shielding layer and an outer shielding layer, the inner shielding layer is positioned between the outer conductor and the outer shielding layer, the inner shielding layer and the outer shielding layer are of a woven structure, and the outer shielding layer can cover the woven holes of the inner shielding layer. The radio frequency coaxial cable of the technical scheme can solve the problems that the shielding attenuation performance of the conventional coaxial cable is poor and the use requirement of the complex environment of rail transit cannot be met.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a radio frequency coaxial cable.
Background
Along with the development of national force in China, the track traffic industry is vigorously developed, but compared with the international advanced level, the coaxial cable manufacturing technology for track traffic equipment in China has the defects, and the reliability and consistency of products are somewhat different from those of products in foreign countries. The coaxial cable for the track traffic equipment has the function of bearing the antenna and signals in the car, and the outer conductor of the coaxial cable in the prior art is generally an aluminum foil and copper wire braided shielding structure, and the coaxial cable of the structure has poor shielding attenuation performance and cannot meet the use requirement under the complex environment of the track traffic although the structure is light in weight.
Disclosure of utility model
The utility model mainly aims to provide a radio frequency coaxial cable which can solve the problems that the shielding attenuation performance of the conventional coaxial cable is poor and the use requirement of a complex environment of rail transit cannot be met.
In order to achieve the above object, according to an aspect of the present utility model, there is provided a radio frequency coaxial cable including an inner conductor, an insulating layer, an outer conductor, and a shielding structure coaxially disposed in this order from inside to outside, the shielding structure including an inner shielding layer and an outer shielding layer, the inner shielding layer being located between the outer conductor and the outer shielding layer, the inner shielding layer and the outer shielding layer being of a braided structure, and the outer shielding layer being capable of covering braided holes of the inner shielding layer.
Further, one of the inner shielding layer and the outer shielding layer is formed by braiding aluminum-magnesium alloy wires, and the other is formed by braiding tinned copper wires.
Further, the inner shielding layer has a braid density less than that of the outer shielding layer.
Further, the range of the weaving density of the inner shielding layer is 90% -94%, and the range of the weaving density of the outer shielding layer is 95% -98%.
Further, the range of the braiding angle of the inner shielding layer is 40% -45%, and the range of the braiding angle of the outer shielding layer is 45% -50%.
Further, the insulating layer comprises an inner insulating layer and an outer insulating layer, the inner insulating layer is located between the inner conductor and the outer insulating layer, the inner insulating layer and the outer insulating layer are made of low dielectric materials, and the dielectric constant of the inner insulating layer is larger than that of the outer insulating layer.
Further, the dielectric constant of the inner insulating layer ranges from 2.28 to 2.30, and the dielectric constant of the outer insulating layer ranges from 2.20 to 2.27.
Further, the inner insulating layer is made of high-melting-point LDPE, and the outer insulating layer is made of low-melting-point HDPE.
Further, the inner conductor is formed by twisting a plurality of metal wires.
Further, the metal wire is silver-plated copper wire; and/or the value range of the twisting pitch of the metal wires is 12 mm-25 mm.
By applying the technical scheme of the utility model, the shielding structure comprises the inner shielding layer and the outer shielding layer, has smaller transfer impedance, better shielding attenuation performance and better applicability, and can meet the use requirement of the complex environment of rail transit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 shows a schematic overall structure of a radio frequency coaxial cable according to an embodiment of the present utility model.
Wherein the above figures include the following reference numerals:
10. An inner conductor; 20. an insulating layer; 30. an outer conductor; 40. a shielding structure; 41. an inner shielding layer; 42. an outer shielding layer; 50. and an outer protective layer.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the present utility model provides a radio frequency coaxial cable, which includes an inner conductor 10, an insulating layer 20, an outer conductor 30, and a shielding structure 40 coaxially disposed in this order from inside to outside, the shielding structure 40 includes an inner shielding layer 41 and an outer shielding layer 42, the inner shielding layer 41 is located between the outer conductor 30 and the outer shielding layer 42, the inner shielding layer 41 and the outer shielding layer 42 are both woven structures, and the outer shielding layer 42 can cover the woven holes of the inner shielding layer 41.
In this embodiment, the outer conductor 30 and the shielding structure 40 both play a role in shielding, where the shielding structure 40 includes an inner shielding layer 41 and an outer shielding layer 42, the shielding structure in the prior art is generally a single-layer shielding layer woven by aluminum foil outer conductor+tin-plated copper wire or copper wire, and the present application is an outer conductor 30+double-layer shielding layer (i.e. the inner shielding layer 41 and the outer shielding layer 42), which has smaller transfer impedance, better shielding attenuation performance and better applicability, and can meet the use requirement of the complex environment of rail transit. In addition, the inner shielding layer 41 and the outer shielding layer 42 are both in a woven structure, the inner shielding layer 41 comprises a plurality of woven holes, the entity structure of the outer shielding layer 42 can cover the woven holes of the inner shielding layer 41, leakage of transmission signals can be reduced, and the shielding effect of the radio frequency coaxial cable is improved.
In one embodiment, the outer conductor 30 is made of aluminum foil.
In one embodiment, one of the inner and outer shields 41, 42 is braided from aluminum magnesium alloy wire and the other is braided from tin-plated copper wire.
In this embodiment, one of the inner shielding layer 41 and the outer shielding layer 42 is formed by braiding aluminum-magnesium alloy wires, and the other is formed by braiding tin-plated copper wires, so that the cost is lower compared with the shielding structure braided by copper wires in the prior art, the overall weight of the cable can be reduced, and the construction and the installation are convenient. In addition, the shielding structure 40 of the present application includes two shielding layers (i.e., the inner shielding layer 41 and the outer shielding layer 42), which can effectively improve the mechanical strength of the cable and reduce the influence of external biological and environmental damage on the cable, compared with the single shielding layer in the prior art. In addition, the aluminum-magnesium alloy wire and the tinned copper wire have the advantages that the material performances of the aluminum-magnesium alloy wire and the tinned copper wire can be complemented, the aluminum-magnesium alloy wire is good in conductivity and light, the tinned copper wire is resistant to corrosion and strong in oxidation resistance, the conductivity and the shielding performance of the aluminum-magnesium alloy wire and the tinned copper wire can be enhanced to a greater extent through combination of the aluminum-magnesium alloy wire and the tinned copper wire, and the aluminum-magnesium alloy wire is more suitable for the use environment of a train.
In one embodiment of the present utility model, the braid density of inner shield 41 is less than the braid density of outer shield 42. The knitting density of the inner shield layer 41 is in the range of 90% to 94% (e.g., 91%, 92%, 93%, etc.), and the knitting density of the outer shield layer 42 is in the range of 95% to 98% (e.g., 96%, 97%, etc.).
In this embodiment, the braiding density of the inner shielding layer 41 is smaller than that of the outer shielding layer 42, so that leakage of transmission signals is reduced by braiding density difference, and shielding effect of the radio frequency coaxial cable is improved. In addition, through the above-mentioned setting, can both guarantee that inner shield 41 and outer shield 42 have certain deformation clearance, when narrow and small space wiring, deformation that can adapt to can also guarantee the shielding effect.
In one embodiment of the present utility model, the range of the braiding angle of the inner shielding layer 41 is 40% -45% (e.g., 41%, 42%, 43%, 44%, etc.), and the range of the braiding angle of the outer shielding layer 42 is 45% -50% (e.g., 46%, 47%, 48%, 49%, etc.).
By the above arrangement, the inner shield layer 41 and the outer shield layer 42 can be cross-peak braided, and the same shielding effect as that of the tubular outer conductor 30 can be provided while ensuring the flexibility of the coaxial cable.
In one embodiment of the present utility model, as shown in fig. 1, the insulating layer 20 includes an inner insulating layer and an outer insulating layer, the inner insulating layer is located between the inner conductor 10 and the outer insulating layer, the inner insulating layer and the outer insulating layer are made of a low dielectric material, and the dielectric constant of the inner insulating layer is greater than that of the outer insulating layer. The dielectric constant of the inner insulating layer ranges from 2.28 to 2.30 (e.g., 2.29, etc.), and the dielectric constant of the outer insulating layer ranges from 2.20 to 2.27 (e.g., 2.21, 2.23, 2.25, etc.).
By the arrangement, separation refraction transmission can be realized during signal transmission, and attenuation is lower under the condition of a certain capacitance.
In addition, the insulating layer 20 is produced by adopting a composite physical foaming insulating technology, so that the loss of transmission medium can be reduced, the transmission performance of the radio frequency coaxial cable can be effectively improved, and the low loss and low standing wave ratio can be realized.
In one embodiment of the utility model, the inner insulating layer is made of high melt index LDPE and the outer insulating layer is made of low melt index HDPE.
In this embodiment, the inner insulating layer is made of high-melting-point LDPE, and the outer insulating layer is made of low-melting-point HDPE, so that the adhesion of the insulating layer 20 can be effectively improved. Compared with the traditional insulating layer 20, the insulating layer 20 has stronger adhesive force, can meet the requirements of a motor train unit, can avoid the separation of the inner conductor 10 and the insulating layer 20 when the cable is bent in wiring or the train runs bumpy, and can also avoid unstable signals caused by poor contact at joints.
In one embodiment, the inner insulation layer is a high melt-index dispersed LDPE (low density polyethylene) and the outer insulation layer is a low melt-index coagulated HDPE (high density polyethylene).
In one embodiment of the present utility model, the inner conductor 10 is twisted from a plurality of wires.
In this embodiment, the inner conductor 10 is formed by twisting a plurality of metal wires, so that the flexibility is higher, the disconnection is difficult, and the wiring in a narrow space is facilitated.
In one embodiment of the utility model, the wire is silver-plated copper wire.
In the embodiment, the metal wire is silver-plated copper wire, so that the conductivity and bending performance of the radio frequency coaxial cable can be improved, the high-frequency resistance is reduced, the signal transmission is more stable, the appearance and the electrical performance of the cable can still be kept in an initial state after the cable is repeatedly and greatly bent, and the transmission performance before and after wiring is kept consistent. In addition, the use of silver-plated copper wires can improve the flexibility and mechanical strength of the inner conductor 10.
In one embodiment of the present utility model, the lay pitch of the plurality of wires is in the range of 12mm to 25mm. Through the arrangement, the problem of high-frequency fixed peak value can be solved, and standing wave stability is realized.
In one embodiment of the utility model, the radio frequency coaxial cable further comprises an outer protective layer 50, the outer protective layer 50 is coated on the periphery of the outer shielding layer 42, the outer protective layer 50 is made of customized oil-resistant, acid-alkali-resistant, high-low temperature-resistant and high-mechanical-strength irradiation crosslinking low-smoke halogen-free flame-retardant polyolefin, a customized extrusion die is adopted, the sheath material is uniformly extruded on the cable core through an extruder, and the outer protective layer 50 is separated from the air in the cable core through a vacuumizing machine, so that the oxygen in the outer protective layer 50 is blocked, and if a fire disaster occurs, the non-metallic materials in the radio frequency coaxial cable can not support combustion, so that the flame-retardant performance of the radio frequency coaxial cable is improved, and meanwhile, the cracking of the radio frequency coaxial cable under the conditions of high and low temperature, greasy dirt and acid and alkali can be avoided, so that the internal structure is not damaged, and the life and property safety of people are protected. The radio frequency coaxial cable has the advantages of high flexibility, low loss, high shielding performance, good high-low temperature characteristic, high mechanical strength, oil resistance, acid and alkali resistance, low friction coefficient and high flame retardance, and is more suitable for application scenes of motor train units.
From the above description, it can be seen that the above-described embodiments of the present utility model achieve the following technical effects: the shielding layer comprises an inner shielding layer and an outer shielding layer, the transfer impedance of the shielding layer is smaller, the shielding attenuation performance is better, the applicability is better, and the use requirements of the complex environment of rail transit can be met.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a radio frequency coaxial cable, its characterized in that includes by interior to outer coaxial inner conductor (10), insulating layer (20), outer conductor (30) and shielding structure (40) that set gradually, shielding structure (40) include inner shield layer (41) and outer shield layer (42), inner shield layer (41) are located outer conductor (30) with between outer shield layer (42), inner shield layer (41) with outer shield layer (42) are the braided structure, just outer shield layer (42) can cover the braided hole of inner shield layer (41).
2. The radio frequency coaxial cable according to claim 1, wherein one of the inner shielding layer (41) and the outer shielding layer (42) is braided with aluminum magnesium alloy wire, and the other is braided with tin-plated copper wire.
3. The radio frequency coaxial cable according to claim 2, wherein the braid density of the inner shield (41) is less than the braid density of the outer shield (42).
4. A radio frequency coaxial cable according to claim 3, wherein the braiding density of the inner shielding layer (41) is in the range of 90-94% and the braiding density of the outer shielding layer (42) is in the range of 95-98%.
5. The radio frequency coaxial cable according to claim 1, wherein the braiding angle of the inner shielding layer (41) ranges from 40% to 45%, and the braiding angle of the outer shielding layer (42) ranges from 45% to 50%.
6. The radio frequency coaxial cable according to any one of claims 1 to 5, wherein the insulating layer (20) comprises an inner insulating layer and an outer insulating layer, the inner insulating layer being located between the inner conductor (10) and the outer insulating layer, the inner insulating layer and the outer insulating layer each being made of a low dielectric material, the dielectric constant of the inner insulating layer being greater than the dielectric constant of the outer insulating layer.
7. The rf coaxial cable of claim 6, wherein the inner insulating layer has a dielectric constant in the range of 2.28 to 2.30 and the outer insulating layer has a dielectric constant in the range of 2.20 to 2.27.
8. The rf coaxial cable of claim 6, wherein the inner insulating layer is made of high melt index LDPE and the outer insulating layer is made of low melt index HDPE.
9. The radio frequency coaxial cable according to any one of claims 1 to 5, wherein the inner conductor (10) is stranded with a plurality of wires.
10. The radio frequency coaxial cable according to claim 9, wherein the wire is silver-plated copper wire; and/or the value range of the twisting pitch of the plurality of metal wires is 12 mm-25 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322529538.9U CN220962889U (en) | 2023-09-15 | 2023-09-15 | Radio frequency coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322529538.9U CN220962889U (en) | 2023-09-15 | 2023-09-15 | Radio frequency coaxial cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220962889U true CN220962889U (en) | 2024-05-14 |
Family
ID=90981829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322529538.9U Active CN220962889U (en) | 2023-09-15 | 2023-09-15 | Radio frequency coaxial cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220962889U (en) |
-
2023
- 2023-09-15 CN CN202322529538.9U patent/CN220962889U/en active Active
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