A braided dielectric layer radio frequency coaxial cable

Abstract

The utility model belongs to cable structure technical field, concretely relates to a kind of braided dielectric layer radio frequency coaxial cable. Inner conductor layer, inner shielding layer and outer shielding layer are coaxially arranged from inside to outside, and the inner conductor layer and outer conductor layer are provided with insulating layer, and the insulating layer includes fiber silk braided layer and polytetrafluoroethylene film layer which are coaxially laminated from inside to outside, the polytetrafluoroethylene film layer is covered on fiber silk braided layer by the form of spiral wrapping, and the outer surface of the outer shielding layer is provided with outer sheath layer. The utility model includes fiber silk braided layer and polytetrafluoroethylene film layer which are coaxially laminated from inside to outside by insulating layer, and the polytetrafluoroethylene film layer is covered on fiber silk braided layer by the form of spiral wrapping, effectively enhance the adhesion between dielectric layer and inner conductor layer, solve the problem that insulation shrinks greatly after cable assembly processing, affect product performance.

Description

Technical Field

[0001] This utility model belongs to the field of cable structure technology, specifically relating to a braided dielectric layer radio frequency coaxial cable. Background Technology

[0002] Radio frequency coaxial cables serve as information carriers, transmitting information between various communication devices and becoming an indispensable electronic component of communication equipment.

[0003] With the continuous improvement of mobile communication technology, the application of radio frequency (RF) cables has become increasingly widespread, penetrating into all areas of the communications industry. Users are also placing increasingly stringent requirements on these cables. Especially in cutting-edge fields such as aerospace, not only are there requirements for the mechanical and electrical properties of the cables, but also for their shrinkage resistance to reduce the defect rate. Conventional RF cables use PTFE film wrapping for the dielectric layer. The dielectric layer has relatively low adhesion to the inner conductor, making it prone to shrinkage during the manufacturing process of finished components. This can lead to poor signal transmission or even failure of the RF cable assembly. Utility Model Content

[0004] To overcome the problem of low adhesion between the dielectric layer and the inner conductor, which leads to easy shrinkage, this utility model provides a braided dielectric layer radio frequency coaxial cable. The insulation layer includes a fiber braided layer and a polytetrafluoroethylene (PTFE) film layer coaxially stacked from the inside to the outside. The PTFE film layer covers the fiber braided layer in a spiral wrapping manner, which effectively enhances the adhesion between the dielectric layer and the inner conductor layer and solves the problem of large insulation shrinkage after cable assembly processing, which affects product performance.

[0005] This utility model solves the above-mentioned technical problems through the following technical solutions.

[0006] The purpose of this utility model is to provide a braided dielectric layer radio frequency coaxial cable, comprising an inner conductor layer, an inner shielding layer, and an outer shielding layer arranged coaxially from the inside to the outside. An insulating layer is provided between the inner conductor layer and the inner shielding layer. The insulating layer includes a fiber braided layer and a polytetrafluoroethylene (PTFE) film layer arranged coaxially from the inside to the outside. The PTFE film layer covers the fiber braided layer in a spiral wrapping manner. The outer surface of the outer shielding layer is covered with an outer sheath layer.

[0007] Preferably, the unfolded structure of the fiber filament braided layer is a rhomboid mesh structure or a rectangular mesh structure.

[0008] Preferably, the wall thickness of the insulating layer is 0.77 mm to 0.87 mm.

[0009] Preferably, the fiber braided layer is made of LCP material fiber ultra-low dielectric PUD 400D specification.

[0010] Preferably, the outer sheath layer is made of perfluoroethylene propylene.

[0011] Preferably, the inner shielding layer is made of silver-plated copper strip spirally wrapped around the insulating layer.

[0012] Preferably, the outer shielding layer is made of silver-plated copper wire woven and wrapped around the inner shielding layer.

[0013] Preferably, the inner conductor layer is made of silver-plated copper wire.

[0014] Compared with the prior art, the present invention has the following advantages: This invention utilizes an insulation layer comprising a fiber braided layer and a polytetrafluoroethylene (PTFE) film layer coaxially stacked from the inside out. The PTFE film layer is spirally wrapped over the fiber braided layer. By changing the insulation layer material and covering structure, the adhesion between the dielectric layer and the inner conductor layer is increased, effectively enhancing the adhesion between the dielectric layer and the inner conductor layer. This solves the problem of large insulation shrinkage after cable assembly processing, which affects product performance, increases the yield rate of finished cable assemblies, and ensures stable transmission of electrical performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the braided dielectric layer radio frequency coaxial cable of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Inner conductor layer; 2. Insulating layer; 3. Inner shielding layer; 4. Outer shielding layer; 5. Outer sheath layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that the technical terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of this utility model. Unless otherwise specified or defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. Words such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects. Terms such as "inner," "outer," "upper," and "lower" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] This utility model provides a braided dielectric layer radio frequency coaxial cable, comprising an inner conductor layer 1, an inner shielding layer 3, and an outer shielding layer 4 arranged coaxially from the inside out. An insulating layer 2 is provided between the inner conductor layer 1 and the inner shielding layer 3. The insulating layer 2 includes a fiber braided layer and a polytetrafluoroethylene (PTFE) film layer arranged coaxially from the inside out. The PTFE film layer is spirally wrapped over the fiber braided layer. The insulating layer 2, which is the dielectric layer, is composed of a non-metallic fiber braided layer and a PTFE film layer. By spirally wrapping the PTFE film layer over the fiber braided layer, the material and covering structure of the insulating layer are changed, thereby increasing the adhesion between the dielectric layer and the inner conductor layer. This effectively enhances the adhesion between the dielectric layer and the inner conductor layer, solves the problem of large insulation shrinkage after cable assembly processing, which affects product performance, increases the yield rate of finished cable assemblies, and ensures stable transmission of electrical performance. The outer surface of the outer shielding layer 4 is covered with an outer sheath layer 5. The outer sheath layer 5 is made of polytetrafluoroethylene propylene, which can withstand high temperatures above 200°C. The purpose of the outer sheath layer 5 is to protect the cable, and its thickness is determined according to the actual usage environment.

[0020] In a specific embodiment, the fiber braided layer is made of LCP fiber ultra-low dielectric PUD 400D specification, which has a low electrical constant, better phase stability performance, and minimal performance change when the temperature environment changes; the unfolded structure of the fiber braided layer is a diamond mesh structure or a rectangular mesh structure, which increases the coverage and encapsulation.

[0021] In a specific embodiment, the wall thickness of the insulating layer 2 is 0.77mm to 0.87mm. The wall thickness of the insulating layer 2 can be designed according to the radio frequency transmission principle to achieve the required transmission performance. It is covered on the fiber braided layer by a polytetrafluoroethylene film layer in a spiral wrapping manner, thereby changing the insulating layer material and covering structure to increase the adhesion between the dielectric layer and the inner conductor layer.

[0022] In a specific embodiment, the inner shielding layer 3 is made of silver-plated copper strip spirally wrapped around the insulation layer 2, forming a complete shielding layer. The spiral wrapping structure of the silver-plated copper strip improves the overall shielding efficiency of the cable, while the spiral structure also increases the cable's bending resistance. The outer shielding layer 4 is made of silver-plated copper wire braided and wrapped around the inner shielding layer 3. The outer shielding layer 4 covers the inner shielding layer 3 in the form of a braided mesh. It has a certain degree of elasticity, which can resist external pulling on the cable. At the same time, the high-density silver-plated copper wire braided mesh can further improve the cable's electrical conductivity and shielding efficiency, and reduce electromagnetic interference.

[0023] In a specific embodiment, the inner conductor layer 1 is made of silver-plated copper wire. Silver-plated copper wire has more stable electrical conductivity, can be used at higher frequencies, and can effectively ensure the reliability of cable signal transmission within the operating frequency range.

[0024] The following specific examples will provide further explanation.

[0025] Example 1 A braided dielectric layer radio frequency coaxial cable comprises an inner conductor layer 1, an insulation layer 2, an inner shielding layer 3, an outer shielding layer 4, and a sheath layer 5 arranged coaxially from the inside to the outside. The insulation layer 2 includes a fiber braided layer and a polytetrafluoroethylene film layer arranged coaxially from the inside to the outside. The polytetrafluoroethylene film layer is covered on the fiber braided layer by spiral wrapping.

[0026] The inner conductor layer 1 is made of silver-plated copper wire, drawn into shape, with a diameter of 0.92mm ± 0.02mm. LCP (Lithium Chloride) ultra-low dielectric PUD 400D fiber is woven onto the inner conductor layer 1 to form a non-metallic fiber filament with a diamond-shaped mesh structure, forming the fiber braid layer. Then, a thin layer of polytetrafluoroethylene (PTFE) is spirally wrapped around the fiber braid layer to obtain the insulation layer 2; the insulation layer 2 has a thickness of 0.82mm ± 0.5mm and a diameter of 2.50mm. The inner shielding layer 3 is made of silver-plated copper strip spirally wrapped around the insulation layer 2. The outer shielding layer 4 is made of silver-plated copper wire woven around the outer conductor layer 3, with a diameter of 3.10mm ± 0.10mm. The outer sheath layer 5 is made of polytetrafluoroethylene (FEP) with a diameter of 3.60mm ± 0.15mm.

[0027] Comparative Example 1 A braided dielectric layer radio frequency coaxial cable comprises an inner conductor layer 1, an insulation layer 2, an inner shielding layer 3, an outer shielding layer 4, and a sheath layer 5 arranged coaxially from the inside to the outside. The insulation layer 2 is a polytetrafluoroethylene (PTFE) film layer, which is spirally wrapped over the inner conductor layer 1.

[0028] The inner conductor layer 1 is made of silver-plated copper wire, formed by wire drawing, with a diameter of 0.92mm ± 0.02mm. A thin layer of polytetrafluoroethylene (PTFE) is spirally wound onto the fiber braid layer within the inner conductor layer 1 to form an insulation layer 2; the insulation layer 2 has a thickness of 0.82mm ± 0.5mm and a diameter of 2.50mm. An inner shielding layer 3 is made of silver-plated copper strip spirally wound onto the insulation layer 2. An outer shielding layer 4 is made of silver-plated copper wire braided onto the outer conductor layer 3, with a diameter of 3.10mm ± 0.10mm. The outer sheath layer 5 is made of perfluoroethylene propylene (FEP) with a diameter of 3.60mm ± 0.15mm.

[0029] The adhesion and finished product shrinkage dimensions of the cables prepared in Example 1 and Comparative Example 1 were tested, and the results are shown in Table 1.

[0030] Table 1. Adhesion and finished product shrinkage dimensions of cables prepared in Example 1 and Comparative Example 1. As shown in Table 1, this utility model achieves the purpose of increasing the adhesion between the dielectric layer and the inner conductor layer by changing the insulation layer material and the covering structure. It effectively enhances the adhesion between the dielectric layer and the inner conductor layer, solves the problem of large insulation shrinkage after cable assembly processing, which affects product performance. The cable with braided dielectric layer has increased adhesion and reduced shrinkage size compared with the same specification product.

[0031] It should be noted that when numerical ranges are involved in this utility model, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described in this utility model to avoid redundancy. Although preferred embodiments of this utility model have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this utility model.

[0032] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A braided dielectric layer radio frequency coaxial cable, comprising an inner conductor layer (1), an inner shielding layer (3), and an outer shielding layer (4) arranged coaxially from the inside to the outside, characterized in that, An insulating layer (2) is provided between the inner conductor layer (1) and the inner shielding layer (3). The insulating layer (2) includes a fiber braided layer and a polytetrafluoroethylene film layer that are coaxially stacked from the inside to the outside. The polytetrafluoroethylene film layer is covered on the fiber braided layer by spiral wrapping. The outer surface of the outer shielding layer (4) is covered with an outer sheath layer (5).

2. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The unfolded structure of the fiber filament braided layer is a rhomboid mesh structure or a rectangular mesh structure.

3. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The wall thickness of the insulating layer (2) is 0.77mm to 0.87mm.

4. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The fiber braided layer is made of LCP material fiber ultra-low dielectric PUD 400D specification.

5. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The outer sheath layer (5) is made of perfluoroethylene propylene.

6. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The inner shielding layer (3) is made of silver-plated copper strip spirally wrapped around the insulating layer (2).

7. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The outer shielding layer (4) is made of silver-plated copper wire woven and wrapped around the inner shielding layer (3).

8. The braided dielectric layer radio frequency coaxial cable according to claim 1, characterized in that, The inner conductor layer (1) is made of silver-plated copper wire.

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