A dual core conductor high speed wire

Abstract

The utility model provides a kind of double-core conductor high-speed wire, including Mylar fixed layer, metal shielding layer, foaming layer and first conductor core, second conductor core and at least one ground wire;The Mylar fixed layer The metal shielding layer And the foaming layer are sequentially arranged from outside to inside;The first conductor core And the second conductor core are set in the foaming layer, and along the axial direction of the foaming layer, the first conductor core And the second conductor core are parallel and keep certain interval;The outer surface of the first conductor core And the outer surface of the second conductor core are completely covered by the foaming layer.The utility model effectively solves the technical problems of insufficient shielding effectiveness and complex grounding structure, and takes into account flexibility and mechanical strength.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to the field of high-speed double-core conductor foamed fluorinated ethylene propylene wire technology. Background Technology

[0002] In the field of high-frequency signal transmission cables (such as coaxial cables and radio frequency cables), electromagnetic shielding performance, insulation reliability, and the complexity of the grounding structure are key factors affecting product performance. Traditional cables suffer from the following technical challenges:

[0003] Insufficient shielding effectiveness: Conventional braided shielding or aluminum foil shielding is prone to electromagnetic leakage in high-frequency environments (such as above 1 GHz), leading to signal crosstalk or interference;

[0004] Complex grounding structure: The ground wire needs to be fixed additionally (such as by binding with tape), which increases the complexity and cost of the process, and the reliability of the fixation is low;

[0005] Balancing insulation and mechanical properties is difficult: ordinary insulating materials (such as PVC and PE) have high dielectric loss (affecting signal quality), while high-performance materials (such as PTFE) are difficult to process and have poor flexibility, making it difficult to meet the requirements of high-frequency transmission and bending.

[0006] To address the aforementioned problems, this utility model proposes a dual-core conductor foamed FEP high-speed line, which effectively solves the above technical issues by optimizing the shielding structure, simplifying the grounding design, and using a foamed FEP insulation layer. Utility Model Content

[0007] This invention provides a dual-core conductor foamed fluorinated ethylene propylene high-speed wire to address the above-mentioned problems. By optimizing the shielding structure, simplifying the grounding design, and using a foamed FEP insulation layer, the above-mentioned technical problems are effectively solved.

[0008] This utility model provides a dual-core conductor high-speed wire, comprising a Mylar fixing layer, a metal shielding layer, a foaming layer, a first conductor core, a second conductor core, and at least one ground wire; the Mylar fixing layer, the metal shielding layer, and the foaming layer are arranged sequentially from the outside to the inside;

[0009] The first conductor core and the second conductor core are disposed in the foam layer and are parallel to each other and maintain a certain distance along the axial direction of the foam layer; the outer surfaces of the first conductor core and the second conductor core are completely covered by the foam layer.

[0010] At least a portion of the surface of the ground wire is electrically connected to the metal shielding layer, and at least a portion of the surface of the ground wire is covered by the foaming layer;

[0011] The metal shielding layer is a tin-plated copper braided mesh with a braiding density of 85%;

[0012] The foamed layer is formed in one step from fluorinated ethylene propylene material through a foaming process.

[0013] Both the first conductor core and the second conductor core are cylindrical silver-plated copper wires with a diameter of 0.5 mm and a conductivity of over 98%; the first conductor core and the second conductor core are arranged with a spacing of 1.0 mm.

[0014] The metal shielding layer has a groove, the receiving groove is used to receive the ground wire, and the ground wire is fixed by an interference fit.

[0015] Furthermore, the number of ground wires is one; the cross-section of the ground wire is circular; on the cross-section of the dual-core conductor high-speed line, the line connecting the center of the ground wire, the center of the first conductor core, and the center of the second conductor core forms an isosceles triangle.

[0016] Furthermore, there are two ground wires, namely a first ground wire and a second ground wire; the cross-sections of the first ground wire and the second ground wire are circular; on the cross-section of the dual-core conductor high-speed line, the center of the first ground wire, the center of the first conductor core, the center of the second conductor core, and the center of the second ground wire are arranged sequentially on the same horizontal line.

[0017] Furthermore, the number of ground wires is one; the cross-section of the ground wire is rectangular; on the cross-section of the dual-core conductor high-speed line, the long side of the ground wire is parallel to the line connecting the center of the first conductor core and the center of the second conductor core, and the short side of the ground wire is perpendicular to the line connecting the center of the first conductor core and the center of the second conductor core.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) This utility model can provide uniform insulation protection, avoid delamination or gaps, and the foamed structure of FEP reduces material density, improves cable bending performance, and maintains mechanical strength. In addition, the low dielectric loss characteristics of FEP are particularly suitable for high-frequency cables (such as 5G and radio frequency cables), reducing signal interference.

[0020] (2) The metal shielding layer of this utility model is provided with a groove for accommodating the ground wire, and the grounding effect is achieved through a simple structure.

[0021] (3) This utility model covers diverse high-frequency transmission needs through single / double ground wires, circular / rectangular ground wires and different arrangement methods (isosceles triangle / collinear / parallel). Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the high-speed line structure in Example 1;

[0024] Figure 2 This is a schematic diagram of the high-speed line structure in Example 2;

[0025] Figure 3 This is a schematic diagram of the high-speed line structure in Example 3;

[0026] Figure 4 This is a schematic diagram of the high-speed line structure in Example 4. Detailed Implementation

[0027] 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.

[0028] Example 1

[0029] Figure 1 This is a schematic diagram of the cross-sectional structure of the high-speed line in this embodiment. The high-speed line in this embodiment is based on a dual-core conductor structure (without a ground wire), suitable for short-distance inter-board interconnects and high-frequency transmission scenarios requiring clear shielding and grounding (e.g., speeds below 1Gbps). Figure 1 As shown, the cross-section of the high-speed line in this embodiment is in the shape of a racetrack, consisting of two straight sides and two curved sides. Furthermore, from the outside in, it comprises a Mylar fixing layer 101, a metal shielding layer 102, and a foaming layer 103.

[0030] The high-speed line in this embodiment also includes a first conductor core 1041 and a second conductor core 1042. The cross-sections of the first conductor core 1041 and the second conductor core 1042 are circular (i.e., cylindrical overall). The outer surface of the first conductor core 1041 and the second conductor core 1042 are disposed within a foam layer 103, and along the axial direction of the foam layer 103, the first conductor core 1041 and the second conductor core 1042 are parallel to each other while maintaining a certain interval. The outer surfaces of the first conductor core 1041 and the second conductor core 1042 are completely covered by the foam layer 103.

[0031] In this embodiment, the foam layer is formed in one step using FEP (fluorinated ethylene propylene) through a foaming process. Because the foam layer 103 is formed from FEP in one step, it directly and completely encapsulates the first conductor core 1041 and the second conductor core 1042, providing uniform insulation protection and preventing delamination or gaps. Simultaneously, the foamed structure of the foam layer 103 reduces material density, improves cable bending performance, and also maintains mechanical properties. Furthermore, the low dielectric loss characteristic of FEP material reduces signal interference.

[0032] Preferably, the metal shielding layer in this embodiment can be a fully enclosed electromagnetic shielding structure made of metal foil or metal woven mesh, and there is no specific limitation thereto.

[0033] Preferably, the Mylar fixing layer in this embodiment is a polyester film layer.

[0034] Ideally, the cross-section of a high-speed line should be circular or rectangular.

[0035] Preferably, the Mylar fixing layer 101 is made of 50μm thick polyester film (PET).

[0036] Preferably, the metal shielding layer 102 is a tin-plated copper braided mesh with a braiding density of 85%.

[0037] Preferably, the thickness of the foam layer 103 is 1.2 mm and the porosity is 40%. In this embodiment, the foam layer is formed in one step by extrusion foaming process of FEP material, wherein the extrusion temperature is 300℃±5℃, nitrogen is used as foaming agent, and the injection pressure of foaming agent is 0.8MPa.

[0038] Preferably, the first conductor core 1041 and the second conductor core 1042 are both silver-plated copper wires with a diameter of 0.5 mm and a conductivity of 98% or higher, and the first conductor core 1041 and the second conductor core 1042 are arranged at a distance of 1.0 mm.

[0039] Tests showed that the dielectric constant of the high-speed cable implemented in this embodiment is as low as 2.1, the dielectric loss tangent at 1GHz is ≤0.0002, and the signal attenuation is reduced by 15% compared with traditional solid PE cables.

[0040] Example 2

[0041] Figure 2 A schematic cross-sectional view of the high-speed line in Embodiment 2 is shown. This embodiment's high-speed line is an enhanced and improved version of Embodiment 1, suitable for RF antenna feed lines and high-frequency scenarios requiring reliable single-point grounding (such as 5G small base station interconnection). The improvement of this embodiment compared to Embodiment 1 is that a ground wire 1050 is also provided in the high-speed line of this embodiment. Figure 2As shown, a groove (not shown in the figure) is provided on the metal shielding layer 102. This groove is used to accommodate the ground wire, and the rest of the structure is consistent with Embodiment 1. See again Figure 2 The ground wire 1050 has a circular cross-section and is a single wire. The ground wire 1050 is disposed in a groove on the metal shielding layer 102, thereby achieving conductive connection and stable fixation between a portion of the surface of the ground wire 1050 and the metal shielding layer 103. At least a portion of the surface of the ground wire 1050 is covered by the foam layer 103.

[0042] Preferably, in the cross-section of the high-speed line, the ground wire 1050, the first conductor core 1041 and the second conductor core 1042 are arranged in an isosceles triangle, that is, in the cross-section, the line connecting the center of the ground wire 1050, the center of the first conductor core 1041 and the center of the second conductor core 1042 forms an isosceles triangle.

[0043] Preferably, in this embodiment, the ground wire 1050 is a single tinned copper wire with a diameter of 0.3mm. Correspondingly, to stably fix the ground wire 1050, the groove depth on the cross-section of the high-speed line is 0.35mm and the width is 0.4mm, that is, the ground wire 1050 is stably fixed by interference fit. Vibration test results show that the displacement of the ground wire is <0.1mm. Compared with the traditional binding method, the risk of ground wire displacement is reduced by 90%, and the grounding reliability is improved by at least 30%, demonstrating a good fixing effect.

[0044] Preferably, the groove is prepared by a rolling process.

[0045] Tests showed that, compared to Example 1, the inter-conductor crosstalk in this embodiment is ≤-50dB, a reduction of approximately 20%.

[0046] This embodiment achieves the fixation of the ground wire 1050 through a simple groove structure, which is not only stable and easy to prepare, but also has good grounding performance.

[0047] Example 3

[0048] Figure 3 A schematic cross-sectional view of the high-speed line in Embodiment 3 is shown. This high-speed line is an enhanced and improved version of Embodiment 2, suitable for interconnection and high-reliability high-frequency transmission scenarios in avionics equipment (such as signal transmission for airborne radar). The improvement of this embodiment compared to Embodiment 2 is that it has two ground wires: a first ground wire 1051 and a second ground wire 1052, and the layout of the ground wires is different. For example... Figure 3As shown, the same fixing method as in Embodiment 2 is used: a groove is provided on the metal shielding layer to accommodate the ground wire, and the ground wire is fixed by interference fit. However, the layout of the ground wire differs from Embodiment 2: on the cross-section of the high-speed line, the center of the first ground wire 1051, the center of the first conductor core 1041, the center of the second conductor core 1042, and the center of the second ground wire 1052 are on the same horizontal line and arranged sequentially from left to right.

[0049] This embodiment employs a redundant dual-ground wire design. Testing shows that, compared to a single-ground wire design, this implementation reduces external electromagnetic coupling interference by 15%. Furthermore, in the event of a single ground wire failure, the remaining ground wires can still maintain over 90% of the grounding performance (below 10GHz).

[0050] Example 4

[0051] Figure 4 A schematic diagram of the cross-sectional structure of the high-speed line in Embodiment 4 is shown. This embodiment is another enhanced and improved version of Embodiment 2, suitable for 5G base station fronthaul cables and high-frequency scenarios requiring low grounding impedance (such as transmission rates above 25Gbps). The difference between this embodiment and Embodiment 2 is the shape of the ground wire. Figure 4 As shown, the cross-section of the ground wire 1053 is rectangular. Similar to Embodiment 2, the ground wire 1053 in this embodiment is fixed by a groove (not shown in the figure) in the metal shielding layer 102.

[0052] Preferably, the rectangle has a length of 1.0 mm, a width of 0.2 mm, and a height of 0.1 mm. The material is copper with a conductivity of ≥97%.

[0053] Ideally, the surface roughness Ra of the ground wire 1053 is ≥1.6μm.

[0054] Ideally, ground wire 1053 is located on the straight side of the high-speed line.

[0055] Preferably, the rectangular ground wire 1053 is parallel to the plane containing the first conductor core 1041 and the second conductor core 1042, and is 0.8 mm apart.

[0056] Preferably, the ground wire 1053 is located directly above or directly below the first conductor core 1041 and the second conductor core 1042.

[0057] This embodiment, through a redesign of the ground wire shape (changing the cross-section from circular to rectangular), not only significantly reduces the grounding impedance but also enhances tensile strength and current carrying capacity. Testing revealed that the grounding impedance of the high-speed line in this embodiment is as low as 0.06Ω, representing a 40% reduction in impedance, a 50N increase in tensile strength, and a 10% increase in current carrying capacity compared to the ground wire in Embodiment Two.

[0058] The terms "equal," "identical," or "equal to" disclosed in this utility model must take into account the parameter distribution of the engineering process, with an error distribution within ±30%. "Parallel" two line segments or two straight lines are defined as having an included angle of less than or equal to 45 degrees. "Perpendicular" two line segments or two straight lines are defined as having an included angle within the range of [60, 120] degrees. The definition of "phase misalignment" also requires consideration of the parameter distribution of the engineering process, with an error distribution of the phase misalignment degree within ±30%. Furthermore, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the absence of further restrictions, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-core conductor high-speed wire, characterized in that, It includes a Mylar fixing layer, a metal shielding layer, a foaming layer, a first conductor core, a second conductor core, and at least one ground wire; the Mylar fixing layer, the metal shielding layer, and the foaming layer are arranged sequentially from the outside to the inside; The first conductor core and the second conductor core are disposed in the foam layer and are parallel to each other and maintain a certain distance along the axial direction of the foam layer; the outer surfaces of the first conductor core and the second conductor core are completely covered by the foam layer. At least a portion of the surface of the ground wire is electrically connected to the metal shielding layer, and at least a portion of the surface of the ground wire is covered by the foaming layer; The metal shielding layer is a tin-plated copper braided mesh with a braiding density of 85%; The foamed layer is formed in one step from fluorinated ethylene propylene material through a foaming process. Both the first conductor core and the second conductor core are cylindrical silver-plated copper wires with a diameter of 0.5 mm and a conductivity of over 98%; the first conductor core and the second conductor core are arranged with a spacing of 1.0 mm. The metal shielding layer has a groove for accommodating the ground wire and fixing the ground wire by an interference fit.

2. The dual-core conductor high-speed line as described in claim 1, characterized in that, The number of ground wires is one; the cross-section of the ground wire is circular; on the cross-section of the dual-core conductor high-speed line, the line connecting the center of the ground wire, the center of the first conductor core, and the center of the second conductor core forms an isosceles triangle.

3. The dual-core conductor high-speed line as described in claim 1, characterized in that, There are two ground wires, namely a first ground wire and a second ground wire; the cross-sections of the first ground wire and the second ground wire are circular; on the cross-section of the dual-core conductor high-speed line, the center of the first ground wire, the center of the first conductor core, the center of the second conductor core, and the center of the second ground wire are arranged sequentially on the same horizontal line.

4. The dual-core conductor high-speed line as described in claim 1, characterized in that, The number of ground wires is one; the cross-section of the ground wire is rectangular; on the cross-section of the dual-core conductor high-speed line, the long side of the ground wire is parallel to the line connecting the center of the first conductor core and the center of the second conductor core, and the short side of the ground wire is perpendicular to the line connecting the center of the first conductor core and the center of the second conductor core.

Images