7 / 8 ''radio frequency coaxial cable for 6G

Abstract

The utility model relates to the technical field of radio frequency coaxial cables, in particular to a 7 / 8 ''radio frequency coaxial cable for 6G, which comprises an inner conductor, a double-gas-injection foaming insulating layer, an annular corrugated outer conductor and a sheath which are sequentially arranged from inside to outside, the double-gas-injection foaming insulating layer is foamed in a double-gas-injection mode, and two gases adopted in the foaming process are CO2 + C4F8. According to the 7 / 8 ''radio frequency coaxial cable for 6G, the dielectric constant epsilon e of the double-gas-injection foaming insulation layer is in direct proportion to the foaming degree and the proportion of the high-density material and the low-density material, and the high-density material and the low-density material can be fully utilized on the premise that the impedance requirement of the cable is ensured through double gas injection and changing of the proportion of the high-density material and the low-density material. The foaming degree of the double-gas-injection foaming insulation layer is effectively improved, and the cut-off frequency of the cable is further improved, so that the 6G use requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to radio frequency coaxial cable technical field especially relates to a 7 / 8 '' radio frequency coaxial cable for 6G. BACKGROUND

[0002] Radio frequency coaxial cable is the carrier of signal propagation in the whole link system. Superior attenuation performance represents the transmission capacity of the cable is more superior, and the transmission distance is longer. The attenuation performance of the cable itself mainly depends on the size of the cable size, and the larger the cable size is, the more superior the attenuation performance is.

[0003] The basic waveform of radio frequency coaxial is transmission transverse electromagnetic wave (TEM wave), which can be transmitted at any frequency. However, when the frequency is very high, that is, the size of the coaxial cable and the wavelength under the use frequency are similar, other types of waveforms will also be generated, thereby interfering with the transmission of TEM wave, and consuming a large amount of capacity, so that the coaxial cable cannot transmit TEM wave. Other waveforms in the coaxial cable are collectively referred to as high-order waves, and the lower limit frequency that the high-order wave can transmit is the highest use frequency that the TEM wave in the coaxial cable can transmit.

[0004] The cutoff frequency formula of the coaxial cable is as follows:

[0005]

[0006] D: represents the equivalent diameter of the outer conductor

[0007] d: represents the diameter of the inner conductor

[0008] εe: represents the equivalent dielectric constant

[0009] The inner conductor of the general 7 / 8 '' coaxial cable is d: 9.0mm; the equivalent diameter D of the outer conductor is: 22.6mm; the insulation equivalent dielectric constant is 1.30 under the condition of foaming degree P of 74%, and the cutoff frequency of the 7 / 8 '' radio frequency coaxial cable calculated according to the above formula is about 5300MHz. Therefore, the cutoff frequency of this cable is 5300MHz. After exceeding this frequency band, high-order waves appear, which leads to unstable signals in the frequency band above 5300MHz, and cannot be used, and thus cannot meet the use requirements of 6G. INVENTION CONTENTS

[0010] The technical problem to be solved by the utility model is: in order to solve the technical problems in the prior art, the utility model provides a 7 / 8 '' radio frequency coaxial cable for 6G.

[0011] The utility model discloses a 7 / 8" radio frequency coaxial cable for 6G, which comprises an inner conductor, a double-gas-foaming insulation layer, an annular corrugated outer conductor and a sheath arranged in sequence from inside to outside.

[0012] The 7 / 8" radio frequency coaxial cable for 6G can effectively improve the foaming degree of the double-gas-foaming insulation layer and the cutoff frequency of the cable under the premise of meeting the impedance requirement of the cable, so as to meet the use requirement of 6G.

[0013] Further, the double-gas-foaming insulation layer is formed by mixing high-density materials and low-density materials.

[0014] Further, the ratio of the high-density materials to the low-density materials is 7:92 to 60:40.

[0015] Further, the annular corrugated outer conductor has annular grooves on the outer surface, the annular grooves are arranged in an array along the axial direction of the annular corrugated outer conductor, annular protrusions are formed between adjacent annular grooves, the annular protrusions have peaks, and the annular grooves have troughs.

[0016] Further, the width of the annular grooves is defined as a pitch, and the pitch is 5 to 7 mm.

[0017] Further, the diameter of the troughs is 22 to 17 mm.

[0018] Further, the annular corrugated outer conductor is formed by rolling with a corrugated tool.

[0019] Further, the inner hole diameter of the corrugated tool is 31 to 34 mm.

[0020] Further, the dielectric constant of the double-gas-foaming insulation layer is proportional to the foaming degree and the ratio of the high-density materials to the low-density materials.

[0021] Further, the inner surface of the sheath is annular to match the outer surface of the annular corrugated outer conductor.

[0022] The utility model discloses a 7 / 8" radio frequency coaxial cable for 6G, which comprises an inner conductor, a double-gas-foaming insulation layer, an annular corrugated outer conductor and a sheath arranged in sequence from inside to outside.

[0023] The 7 / 8" radio frequency coaxial cable for 6G can effectively improve the foaming degree of the double-gas-foaming insulation layer and the cutoff frequency of the cable under the premise of meeting the impedance requirement of the cable, so as to meet the use requirement of 6G. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model is further described below in combination with the drawings and examples.

[0025] Fig. 1 It is the structure schematic diagram of the whole of 7 / 8" radio frequency coaxial cable for 6G in the utility model.

[0026] Fig. 2 It is the schematic diagram of wave crest and wave trough in the utility model.

[0027] Fig. 3 It is the schematic diagram of the corrugated tool in the utility model.

[0028] In the drawing: 1, inner conductor;2, double injection gas foaming insulation layer;3, annular corrugated outer conductor;31, wave crest;32, wave trough;33, pitch;4, sheath;5, corrugated tool;51, large hole;52, small hole;53, rolling lines;54, extension section. Specific implementation

[0029] The utility model is further described below in combination with the drawings and examples. These drawings are all simplified schematic diagrams, and only the basic structure of the utility model is schematically shown, so it only shows the structure related to the utility model.

[0030] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. The features limited by "first" and "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more. In the description of the utility model, it is necessary to explain that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] The utility model discloses a 6G uses 7 / 8" radio frequency coaxial cable.

[0032] Refer to Figs. 1 to 3 A 6G uses 7 / 8" radio frequency coaxial cable, including the inside and outside setting of inner conductor 1, double injection gas foaming insulation layer 2, annular corrugated outer conductor 3 and sheath 4, the inner surface of sheath 4 is spiral type, with the outer surface of annular corrugated outer conductor 3 adaptation.

[0033] The dielectric constant of the high-density material and the low-density material is ε1 and ε2 respectively;

[0034]

[0035] Wherein S1 is the proportion of high-density material, S2 is the proportion of low-density material.

[0036] In addition,

[0037]

[0038] Wherein P is the foaming degree, and ε is the dielectric constant of the combined insulation material.

[0039] Therefore, the dielectric constant ε of the double injection gas foaming insulation layer 2 is proportional to the foaming degree and the proportion of high-density material and low-density material. e

[0040] To improve the foaming degree of the double injection gas foaming insulation layer 2, the double injection gas foaming insulation layer 2 can be foamed by double injection gas, and the two gases used in the foaming process are CO2+C4F8, so that the foaming degree of the double injection gas foaming insulation layer 2 reaches more than 55%.

[0041] Further, the double injection gas foaming insulation layer 2 is formed by mixing high-density material and low-density material, and the ratio between the high-density material and the low-density material is 7:92 to 60:40.

[0042] In this application, the double injection gas foaming insulation layer 2 is an insulation layer formed by polyethylene, nucleating agent and gas physical foaming. The polyethylene includes high-density polyethylene and low-density polyethylene. The high-density polyethylene is the high-density material mentioned above, and the low-density polyethylene is the low-density material mentioned above. The weight percentage of high-density polyethylene, low-density polyethylene and nucleating agent is 8% high-density polyethylene, 91% low-density polyethylene and 1% nucleating agent, and the foaming degree is 77-83%. The gas is CO2+C4F8 mentioned above.

[0043] Specifically, the outer surface of the annular corrugated outer conductor 3 has an annular groove, the annular groove is arranged along the axial direction of the annular corrugated outer conductor 3, and the annular protrusion is formed between the adjacent annular grooves. The annular protrusion has a wave crest 31, and the annular groove has a wave trough 32.​

[0044] Further, the width of the annular groove is defined as pitch 33, and the pitch 33 is 5 to 7 mm. The valley 32 has a diameter of 22 to 17 mm.

[0045] Further, the annular corrugated outer conductor 3 is formed by rolling with a rolling tool 5. The inner hole diameter of the rolling tool 5 is 31 to 34 mm. The rolling tool 5 has a mounting hole to be mounted on the equipment by bolts. The inner hole of the rolling tool 5 includes a large hole 51 and a small hole 52, and the outer conductor enters the rolling tool 5 from the large hole 51 during processing. The inner wall of the small hole 52 is provided with a rolling pattern 53, and the inner diameter of the rolling pattern 53 is 22-17 mm. The end of the rolling tool 5 away from the large hole 51 is provided with an extension section 54, and the diameter of the extension section 54 is smaller than that of the rolling tool 5. The thickness of the extension section 54 can be 3 to 20 mm, the end of the rolling pattern 53 away from the large hole 51 extends to the extension section 54, the extension section 54 is also the outlet end during processing of the outer conductor, and the smaller diameter of the extension section 54 makes the hardness of the extension section 54 lower than that of the main part of the rolling tool 5, so that the extension section 54 has better elasticity and can be slightly offset, thereby reducing the possibility of damage to the outer conductor due to the hardness of the rolling pattern 53 when the outer conductor is separated from the rolling pattern 53.

[0046] Working principle: the dielectric constant ε of the double-gas-foaming insulation layer 2 e The dielectric constant ε of the double-gas-foaming insulation layer 2 is proportional to the foaming degree and the ratio of the high-density material and the low-density material, and by means of double-gas-foaming and changing the ratio of the high-density material and the low-density material, the foaming degree of the double-gas-foaming insulation layer 2 can be effectively improved under the premise of meeting the cable impedance requirement, thereby improving the cutoff frequency of the cable to meet the use requirement of 6G.

[0047] Based on the above ideal embodiments of the present application, the related personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined according to the scope of the claims.

Claims

1. A 7 / 8" radio frequency coaxial cable for 6G, characterized by, The cable comprises an inner conductor (1), a double-gas-foaming insulation layer (2), an annular corrugated outer conductor (3) and a sheath (4) arranged in sequence from inside to outside, the double-gas-foaming insulation layer (2) is foamed by double-gas-foaming, two kinds of gases used in the foaming process are CO2+C4F8, so that the foaming degree of the double-gas-foaming insulation layer (2) reaches more than 55%.

2. The 7 / 8" radio frequency coaxial cable for 6G according to claim 1, wherein, The double-gas-foaming insulation layer (2) is formed by mixing high-density material and low-density material.

3. The 7 / 8" radio frequency coaxial cable for 6G of claim 2, wherein, The ratio between the high-density material and the low-density material is 7:92 to 60:

40.

4. The 7 / 8" radio frequency coaxial cable for 6G of claim 1, wherein, The annular corrugated outer conductor (3) has an annular groove on the outer surface, the annular groove is arranged in an array along the axial direction of the annular corrugated outer conductor (3), and an annular protrusion is formed between adjacent annular grooves, the annular protrusion has a wave crest (31), and the annular groove has a wave trough (32).

5. A 7 / 8" radio frequency coaxial cable for 6G as defined in claim 4, wherein, The width of the annular groove is defined as a pitch (33), and the pitch (33) is 5 to 7 mm.

6. A 7 / 8" radio frequency coaxial cable for 6G as defined in claim 5, wherein, The diameter of the wave trough (32) is 22 to 17 mm.

7. A 7 / 8" radio frequency coaxial cable for 6G as defined in claim 6, wherein, The annular corrugated outer conductor (3) is formed by rolling with a rolling tool (5).

8. A 7 / 8" radio frequency coaxial cable for 6G as defined in claim 7, wherein, The inner hole diameter of the rolling tool (5) is 31 to 34 mm.

9. A 7 / 8" radio frequency coaxial cable for 6G as defined in claim 1, wherein, The dielectric constant of the double-gas-foaming insulation layer (2) is directly proportional to the foaming degree and the ratio of the high-density material and the low-density material.

10. A 7 / 8" radio frequency coaxial cable for 6G as defined in claim 1, wherein, The inner surface of the sheath (4) is annular to match the outer surface of the annular corrugated outer conductor (3).

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