RF coaxial cable

Abstract

This invention provides a radio frequency (RF) coaxial cable. The RF coaxial cable includes an inner conductor, an insulating portion, and an outer conductor arranged sequentially from the inside to the outside. The insulating portion includes an inner insulating layer, a support portion, and an outer insulating layer arranged sequentially from the inside to the outside. The support portion includes multiple support arms, which are spaced apart circumferentially along the RF coaxial cable. The two ends of each support arm are connected to the inner and outer insulating layers, respectively. A cavity is formed between the inner and outer insulating layers and the support arms. The support arms have a width dimension along the circumferential direction of the RF coaxial cable, which gradually increases from the inner to the outer insulating layer. This solution addresses the problem in existing technologies where increasing the porosity of the insulating layer to reduce signal loss results in poor support performance of the RF coaxial cable, affecting its durability and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency coaxial cables, and more particularly, to a radio frequency coaxial cable. Background Art

[0002] A radio frequency coaxial cable generally includes an inner conductor, an insulating layer, an outer conductor, and a sheath that are arranged in sequence from the inside to the outside.

[0003] In the prior art, the insulating layer is usually a layer structure wrapped around the outer circumference of the inner conductor. To reduce the signal loss of the insulating layer, it is usually necessary to increase the porosity of the insulating layer. The higher the porosity of the insulating layer, the higher the air proportion, and the smaller the signal loss of the radio frequency coaxial cable. However, blindly increasing the porosity will make it difficult for the insulating layer to provide sufficient support. When the radio frequency coaxial cable is bent, wrinkles appear on the surface and the cross-section of the bending part becomes flat, affecting the mechanical strength and flexibility of the radio frequency coaxial cable, and reducing the durability and reliability of the radio frequency coaxial cable. Summary of the Invention

[0004] The present invention provides a radio frequency coaxial cable to solve the problem that when reducing signal loss by increasing the porosity of the insulating layer in the prior art, the support effect of the radio frequency coaxial cable is poor, affecting the durability and reliability of the radio frequency coaxial cable.

[0005] The present invention provides a radio frequency coaxial cable. The radio frequency coaxial cable includes an inner conductor, an insulating part, and an outer conductor that are arranged in sequence from the inside to the outside. The insulating part includes an inner insulating layer, a support part, and an outer insulating layer that are arranged in sequence from the inside to the outside. The support part includes a plurality of support arms. The plurality of support arms are circumferentially spaced apart along the radio frequency coaxial cable. Both ends of the support arm are respectively connected to the inner insulating layer and the outer insulating layer. A cavity is formed between the inner insulating layer, the outer insulating layer, and the support arm. Along the circumference of the radio frequency coaxial cable, the support arm has a width dimension, and the width dimension of the support arm gradually increases from the direction of the inner insulating layer to the outer insulating layer.

[0006] Further, the circumference of the outer surface of the inner insulating layer is L1. Along the circumference of the radio frequency coaxial cable, the sum of the width dimensions of the end faces of all the support arms connected to the inner insulating layer is b1, and 15%*L1 < b1 < 20%*L1; the circumference of the inner surface of the outer insulating layer is L2. Along the circumference of the radio frequency coaxial cable, the sum of the width dimensions of the end faces of all the support arms connected to the outer insulating layer is b2, and 15%*L2 < b2 < 20%*L2.

[0007] Further, b1 < b2.

[0008] Furthermore, the support includes a plurality of first support arms and a plurality of second support arms, with a second support arm disposed between two adjacent first support arms. The width of the end of the first support arm connected to the inner insulation layer is greater than the width of the end of the second support arm connected to the outer insulation layer, and the width of the end of the first support arm connected to the outer insulation layer is greater than the width of the end of the second support arm connected to the outer insulation layer.

[0009] Furthermore, the support also includes a connecting arm, which is disposed between two adjacent support arms, with both ends of the connecting arm connected to the two adjacent support arms respectively.

[0010] Furthermore, the radio frequency coaxial cable has diameter lines, with each connecting arm parallel to one of the diameter lines.

[0011] Furthermore, multiple connecting arms are provided between two adjacent support arms, and the multiple connecting arms are distributed at equal intervals along the extension direction of the support arms.

[0012] Furthermore, the distance from the connection point of the connecting arm and the support arm near the inner insulation layer to the inner insulation layer is d1, and the distance from the connection point of the connecting arm and the support arm near the outer insulation layer to the outer insulation layer is d2, where d1 = d2.

[0013] Furthermore, the foaming degree of the support is higher than that of the inner insulation layer, and the foaming degree of the inner insulation layer is higher than that of the outer insulation layer.

[0014] Furthermore, the foaming degree of the support is set between 70% and 80%; the foaming degree of the inner insulation layer is set between 5% and 10%; and the foaming degree of the outer insulation layer is less than 5%.

[0015] Furthermore, the support arm includes a first section and a second section connected to each other. The first section is located on the side of the connecting arm closer to the inner insulation layer. The foaming degree of the first section is the same as that of the connecting arm, while the foaming degree of the second section is less than that of the connecting arm.

[0016] Furthermore, the foaming degree of the insulation part is 0.

[0017] By applying the technical solution of this invention, an insulating portion is provided between the inner conductor and the outer conductor, which can reduce signal transmission loss while ensuring the structural strength of the radio frequency coaxial cable. Specifically, in this solution, the insulating portion includes an inner insulating layer, a support portion, and an outer insulating layer arranged sequentially from the inside to the outside. The support portion includes multiple support arms, which are distributed circumferentially along the radio frequency coaxial cable. A cavity is formed between the inner insulating layer, the outer insulating layer, and the support arms. This arrangement increases the air volume between the inner and outer insulating layers. Air, as an insulating medium, has a low dielectric constant and low dielectric loss. The formation of the cavity reduces signal loss. During use, radio frequency (RF) coaxial cables are subject to impacts and vibrations. The outer periphery of the RF coaxial cable is more significantly affected by impacts. In this design, the width of the support arm gradually increases from the inner insulation layer to the outer insulation layer along the circumference of the RF coaxial cable. This design allows the outer periphery of the support arm to provide a larger surface area to absorb and disperse energy, reducing impact damage to the internal structure of the RF coaxial cable. The wider outer periphery of the support arm provides a larger lever arm, improving the ability to transmit and distribute loads. Furthermore, the increased width of the support arm provides a larger section modulus, increasing the bending strength of the entire structure. Compared to a design where the support arm has a uniform width from the inner insulation layer to the outer insulation layer, this design further enhances the RF coaxial cable's resistance to impacts and vibrations, improving its reliability and durability, while maintaining the same cavity cross-sectional area. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A cross-sectional view of the radio frequency coaxial cable provided in an embodiment of the present invention is shown;

[0020] Figure 2 A cross-sectional view of one type of insulation portion of the radio frequency coaxial cable provided in an embodiment of the present invention is shown;

[0021] Figure 3 A cross-sectional view of another insulation portion of the radio frequency coaxial cable provided in an embodiment of the present invention is shown;

[0022] Figure 4 A cross-sectional view of another insulation portion of the radio frequency coaxial cable provided in an embodiment of the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 01. Inner conductor; 02. Outer conductor;

[0025] 10. Insulation components;

[0026] 11. Inner insulation layer;

[0027] 12. Support section; 1201. First section; 1202. Second section;

[0028] 121. First support arm; 122. Second support arm; 123. Connecting arm;

[0029] 13. Outer insulation layer. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, this embodiment of the invention provides a radio frequency coaxial cable. The radio frequency coaxial cable includes an inner conductor 01, an insulation portion 10, and an outer conductor 02 arranged sequentially from the inside to the outside. The insulation portion 10 includes an inner insulation layer 11, a support portion 12, and an outer insulation layer 13 arranged sequentially from the inside to the outside. The support portion 12 includes multiple support arms that are spaced apart circumferentially along the radio frequency coaxial cable. The two ends of the support arms are connected to the inner insulation layer 11 and the outer insulation layer 13, respectively. A cavity is formed between the inner insulation layer 11, the outer insulation layer 13, and the support arms. The support arms have a width dimension along the circumferential direction of the radio frequency coaxial cable, and the width dimension of the support arms gradually increases from the inner insulation layer 11 to the outer insulation layer 13.

[0032] By applying the technical solution of this invention, an insulating portion 10 is provided between the inner conductor 01 and the outer conductor 02, which can reduce signal transmission loss while ensuring the structural strength of the radio frequency coaxial cable. Specifically, in this solution, the insulating portion 10 includes an inner insulating layer 11, a support portion 12, and an outer insulating layer 13 arranged sequentially from the inside to the outside. The support portion 12 includes multiple support arms, which are distributed circumferentially along the radio frequency coaxial cable, and a cavity is formed between the inner insulating layer 11, the outer insulating layer 13, and the support arms. This arrangement increases the volume of air between the inner insulating layer 11 and the outer insulating layer 13. Air, as an insulating medium, has a low dielectric constant and low dielectric loss. The formation of the cavity reduces signal loss. During use, RF coaxial cables are subject to impacts and vibrations. The outer periphery of the RF coaxial cable is significantly affected by impacts. In this design, the width of the support arm gradually increases along the circumferential direction of the RF coaxial cable from the inner insulation layer 11 to the outer insulation layer 13. This design allows the outer periphery of the support arm to provide a larger surface area to absorb and disperse energy, reducing impact damage to the internal structure of the RF coaxial cable. The wider outer periphery of the support arm provides a larger lever arm, improving the ability to transmit and distribute loads. Furthermore, the increased width of the support arm provides a larger section modulus, increasing the bending strength of the entire structure. Compared to a design where the support arm has a uniform width along the direction of the inner insulation layer 11 to the outer insulation layer 13, this design further enhances the RF coaxial cable's resistance to impacts and vibrations, improving its reliability and durability, while maintaining the same cavity cross-sectional area. Compared to traditional technical solutions, this design balances the durability and signal transmission performance of the RF coaxial cable.

[0033] In this embodiment, the axial extension of the support arm passes through the center of the RF coaxial cable. This arrangement improves the uniformity of radial stress distribution, compressive and bending strength, reduces stress concentration, and further enhances the durability and reliability of the RF coaxial cable. Furthermore, this arrangement reduces torsional deformation of the RF coaxial cable under torque, improving the support effect on the cable.

[0034] like Figure 1 and Figure 2As shown, further, the perimeter of the outer surface of the inner insulating layer 11 is L1. Along the circumferential direction of the radio frequency coaxial cable, the sum of the width dimensions of the end faces of all the support arms connected to the inner insulating layer 11 is b1, and 15%*L1 < b1 < 20%*L1. With such a setting, the ratio a between the end face area of the end of the support arm connected to the inner insulating layer 11 and the outer surface area of the inner insulating layer 11 is set to be between 15% and 20%. When the above ratio a < 15%, the stability of the connection between the support arm and the inner insulating layer 11 is relatively low, and cracks may occur at the position where the support arm is connected to the inner insulating layer 11, and it is not convenient to achieve processing; when the above ratio a > 20%, it may cause waste of the material of the support arm, or reduce the cross-sectional area of the cavity due to the too large area at the connection between the support arm and the inner insulating layer 11, resulting in signal loss. This solution sets the above ratio a between 15% and 20%, which can ensure the stability of the connection between the support arm and the inner insulating layer 11, and at the same time reduce the loss of signal transmission. Among them, b1 can be set to 16%*L1, 17%*L1, 18%*L1 or 19%*L1, etc.

[0035] Similarly, in this solution, the perimeter of the inner surface of the outer insulating layer 13 is L2. Along the circumferential direction of the radio frequency coaxial cable, the sum of the width dimensions of the end faces of all the support arms connected to the outer insulating layer 13 is b2, and 15%*L2 < b2 < 20%*L2. Among them, b2 can be set to 16%*L2, 17%*L2, 18%*L2 or 19%*L2, etc.

[0036] In the embodiment of this solution, b1 < b2. With such a setting, the end face area of the connection between the support arm and the outer insulating layer 13 can be increased as much as possible, the buffer stress when the radio frequency coaxial cable is impacted can be increased as much as possible, and the situation of damaging the internal structure of the radio frequency coaxial cable can be reduced.

[0037] Furthermore, the support portion 12 includes multiple first support arms 121 and multiple second support arms 122. A second support arm 122 is positioned between adjacent first support arms 121. The width of the end of a first support arm 121 connected to the inner insulation layer 11 is greater than the width of the end of a second support arm 122 connected to the outer insulation layer 13, and vice versa. During use, the RF coaxial cable may experience situations where a particular area is frequently subjected to impact or bears a relatively large load. Specifically, when using the RF coaxial cable, the area bearing the larger load is aligned with the first support arm 121, allowing the first support arm 121 to withstand more impact force, providing higher local load-bearing capacity, more effectively resisting concentrated loads or impacts, providing a more optimized stress distribution, and improving the structural stability of the RF coaxial cable.

[0038] In some embodiments of this solution, a plurality of second support arms 122 are provided between two adjacent first support arms 121.

[0039] In this embodiment, a second support arm 122 is provided between two adjacent first support arms 121, and the first support arms 121 and the second support arms 122 are distributed circumferentially along the radio frequency coaxial cable. This arrangement allows the first support arms 121 and the second support arms 122 to bear the mechanical load acting on the radio frequency coaxial cable more evenly, reducing local stress concentration and improving the compressive strength and bending resistance of the radio frequency coaxial cable.

[0040] like Figure 1 and Figure 2 As shown, specifically, in the embodiments of this application, the width dimension of the end of each first support arm 121 connected to the inner insulating layer 11 is b11, and the width dimension of the end of each first support arm 121 connected to the outer insulating layer 13 is b21; the width dimension of the end of each second support arm 122 connected to the inner insulating layer 11 is b12, and the width dimension of the end of each second support arm 122 connected to the outer insulating layer 13 is b22; wherein, the sum of multiple b11 and multiple b12 is b1, and the sum of multiple b21 and multiple b22 is b2.

[0041] In this embodiment, the support portion 12 further includes a connecting arm 123, which is disposed between two adjacent support arms. Both ends of the connecting arm 123 are connected to the two adjacent support arms respectively. The connecting arm 123 can act as a bending-resistant member, working together with the support arms to improve the RF coaxial cable's resistance to bending and torsional forces, maintaining the cable's geometry. Furthermore, the connecting arm 123 can more effectively distribute and disperse stress between the support arms, reducing local stress concentration and thus lowering the risk of fatigue damage. Specifically, after the RF coaxial cable is impacted, the impact force is first transmitted along one or more support arms to the center of the RF coaxial cable, and then evenly distributed from the center to the connecting arm 123 and the support arms. This embodiment does not limit the specific shape of the connecting arm 123.

[0042] like Figure 2 As shown in the embodiment of this solution, the radio frequency coaxial cable has a diameter line (i.e., a line parallel to the diameter direction), the cross-section of the connecting arm 123 is a straight structure, and the connecting arm 123 is parallel to one of the diameter lines. That is, the angle between the connecting arm and the two adjacent supporting arms is the same. This arrangement can further improve the bending resistance of the connecting arm.

[0043] like Figure 3 As shown, in some other embodiments of this solution, the cross-section of the connecting arm 123 is a bent structure, which includes multiple interconnected bent segments, with an obtuse angle between two adjacent bent segments. This configuration effectively increases the length of the connecting arm 123, extends the stress release path, and improves the durability of the insulation. In this embodiment, the bent structure includes two bent segments.

[0044] This solution does not limit the number of connecting arms 123 between two adjacent support arms.

[0045] like Figure 2 and Figure 3 As shown, in some embodiments of this solution, a connecting arm 123 is provided between two adjacent support arms.

[0046] In some embodiments of this solution, multiple connecting arms 123 are provided between two adjacent support arms, and the multiple connecting arms 123 are evenly spaced along the extension direction of the support arms. This arrangement can further improve the bending resistance of the RF coaxial cable and enhance its durability.

[0047] like Figure 1 , Figure 2 and Figure 4As shown, further, the distance from the connection point of the connecting arm 123 near the inner insulation layer 11 to the support arm to the inner insulation layer 11 is d1, and the distance from the connection point of the connecting arm 123 near the outer insulation layer 13 to the outer insulation layer 13 is d2, where d1 = d2. This arrangement can further improve the uniformity of stress distribution and enhance the support effect of the support part 12.

[0048] Furthermore, when multiple connecting arms 123 are provided between two adjacent support arms, the distance between the connection positions of two adjacent connecting arms 123 and the support arms is d3, where d1 = d3. This arrangement can further improve the uniformity of stress distribution and enhance the support effect of the support part 12.

[0049] In this embodiment, the insulating portion 10 is formed on the outer periphery of the inner conductor 01 using a melt-forming technique. This arrangement improves the stability of the connection between the insulating portion 10 and the inner conductor.

[0050] Furthermore, the foaming degree of the support portion 12 is higher than that of the inner insulation layer 11, and the foaming degree of the inner insulation layer 11 is higher than that of the outer insulation layer 13. In RF coaxial cable design, foaming degree refers to the proportion of air bubbles or voids contained in the insulation material. The lower the foaming degree, the denser the material and the fewer the voids. The lower foaming degree of the outer insulation layer 13 allows it to have relatively high hardness and compressive strength. The support portion 12 mainly serves the function of signal transmission, and its higher foaming degree reduces signal loss and improves signal transmission efficiency. The foaming degree of the inner insulation layer 11 is set between that of the support portion 12 and the outer insulation layer 13. This setting increases the effective contact area between the inner insulation layer 11 and the inner conductor 01, improving the stability of the connection between them. Furthermore, the difference in foaming degree between the inner insulation layer 11, the support portion 12, and the outer insulation layer 13 can reduce the possibility of the inner insulation layer 11 and the outer insulation layer 13 generating a resonant frequency under external force, which could lead to structural damage to the support portion 12.

[0051] In this embodiment, the foaming degree of the inner insulation layer 11 is set between 5% and 10%. The foaming degree of the inner insulation layer 11 can be set to 5%, 6%, 7%, 8%, 9%, or 10%, etc.

[0052] In this embodiment, the foaming degree of the outer insulation layer 13 is less than 5%. The foaming degree of the outer insulation layer 13 can be set to 3%, 4%, etc.

[0053] In this embodiment of the solution, the foaming degree of the support portion 12 is set between 70% and 80%.

[0054] In some embodiments of this solution, the first support arm 121, the second support arm 122, and the connecting arm 123 have the same degree of foaming, which can be specifically set to 70%, 72%, 74%, 75%, 77%, or 80%, etc.

[0055] like Figure 2 As shown, when a connecting arm 123 is provided between two adjacent support arms, the support arm includes a first segment 1201 and a second segment 1202 connected to each other. The first segment 1201 is located on the side of the connecting arm 123 near the inner insulating layer 11. The foaming degree of the first segment 1201 is the same as that of the connecting arm 123, while the foaming degree of the second segment 1202 is less than that of the connecting arm 123. This arrangement can further improve the structural strength of the entire support part 12 and enhance the signal transmission effect.

[0056] The foaming degree of the first section 1201 and the connecting arm 123 can be set between 75% and 80%, and the foaming degree of the second section 1202 can be set between 70% and 75%.

[0057] Specifically, when a connecting arm 123 is provided between two adjacent support arms, the support portion 12 is extruded and formed on the outer periphery of the inner conductor 01 by a melt extrusion process, and the first segment 1201 and the connecting arm 123 are extruded simultaneously. The foaming degree of the first segment 1201 and the connecting arm 123 can be set to 75%, 77%, or 80%, etc.; the foaming degree of the second segment 1202 can be set to 70%, 72%, 74%, or 75%, etc.

[0058] Similarly, when multiple connecting arms 123 are provided between two adjacent support arms, each support arm includes multiple interconnected branch segments. The lengths of adjacent branch segments are the same. Along the direction from the inner conductor 01 to the outer conductor 02, the foaming degree of the branch segments gradually decreases. The foaming degree of the branch segment between two adjacent connecting arms 123 is the same as that of the connecting arm 123 closest to the outer insulation layer 13. The support portion 12 is extruded onto the outer periphery of the inner conductor 01 using a melt extrusion process. Corresponding portions of the connecting arms 123 and support portions 12 with the same foaming degree are extruded synchronously.

[0059] Optionally, the insulating part 10 can be made of at least one of polyolefin plastics and fluoroplastics; and the foaming gas injected into the insulating part 10 during the foaming process can be at least one of Freon, nitrogen, and carbon dioxide.

[0060] Of course, in other embodiments, such as in bending scenarios where better mechanical and physical properties of the entire insulation portion 10 are required, the degree of foaming of the entire insulation portion 10 may also be 0.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0063] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A radio frequency coaxial cable, characterized by The radio frequency coaxial cable comprises an inner conductor (01), an insulating part (10) and an outer conductor (02) arranged from inside to outside, the insulating part (10) comprises an inner insulating layer (11), a supporting part (12) and an outer insulating layer (13) arranged from inside to outside, the supporting part (12) comprises a plurality of supporting arms, the plurality of supporting arms are spaced apart along the circumference of the radio frequency coaxial cable, the two ends of the supporting arm are connected with the inner insulating layer (11) and the outer insulating layer (13) respectively, a cavity is formed between the inner insulating layer (11), the outer insulating layer (13) and the supporting arm, the supporting arm has a width dimension along the circumference of the radio frequency coaxial cable, and the width dimension of the supporting arm gradually increases from the inner insulating layer (11) to the outer insulating layer (13); The supporting part (12) further comprises: A connecting arm (123) is arranged between two adjacent supporting arms, and the two ends of the connecting arm (123) are connected with the two adjacent supporting arms respectively; the foaming degree of the supporting part (12) is higher than that of the inner insulating layer (11), and the foaming degree of the inner insulating layer (11) is higher than that of the outer insulating layer (13).

2. The radio frequency coaxial cable according to claim 1, wherein The circumference of the outer surface of the inner insulating layer (11) is L1, the sum of the width dimensions of the end faces of all the supporting arms connected with the inner insulating layer (11) along the circumference of the radio frequency coaxial cable is b1, and 15%*L1<b1<20%*L1; The circumference of the inner surface of the outer insulating layer (13) is L2, the sum of the width dimensions of the end faces of all the supporting arms connected with the outer insulating layer (13) along the circumference of the radio frequency coaxial cable is b2, and 15%*L2<b2<20%*L2.

3. The radio frequency coaxial cable of claim 2, wherein, b1<b2.

4. The radio frequency coaxial cable of claim 1, wherein, The supporting part (12) comprises a plurality of first supporting arms (121) and a plurality of second supporting arms (122), a second supporting arm (122) is arranged between two adjacent first supporting arms (121), the width dimension of the end of the first supporting arm (121) connected with the inner insulating layer (11) is greater than the width dimension of the end of the second supporting arm (122) connected with the outer insulating layer (13), and the width dimension of the end of the first supporting arm (121) connected with the outer insulating layer (13) is greater than the width dimension of the end of the second supporting arm (122) connected with the outer insulating layer (13).

5. The radio frequency coaxial cable of claim 1, wherein, The radio frequency coaxial cable has diameter lines, and each connecting arm (123) is parallel to one of the diameter lines.

6. The radio frequency coaxial cable of claim 1, wherein, A plurality of connecting arms (123) are arranged between two adjacent supporting arms, and the plurality of connecting arms (123) are equally spaced apart along the extension direction of the supporting arm.

7. The radio frequency coaxial cable of claim 6, wherein, The distance from the connecting position of the connecting arm (123) close to the inner insulation layer (11) to the inner insulation layer (11) is d1, and the distance from the connecting position of the connecting arm (123) close to the outer insulation layer (13) to the outer insulation layer (13) is d2, d1=d2.

8. The radio frequency coaxial cable of claim 1, wherein, The foaming degree of the support part (12) is set to be between 70% and 80%; The foaming degree of the inner insulation layer (11) is set to be between 5% and 10%; The foaming degree of the outer insulation layer (13) is less than 5%.

9. The radio frequency coaxial cable of claim 1, wherein, The support arm comprises a first segment (1201) and a second segment (1202) connected to each other, the first segment (1201) is located on the side of the connecting arm (123) close to the inner insulation layer (11), the foaming degree of the first segment (1201) is the same as that of the connecting arm (123), and the foaming degree of the second segment (1202) is less than that of the connecting arm (123).

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