A low-loss leaky coaxial cable

Abstract

The application relates to a low-loss leakage coaxial cable, which comprises, from inside to outside, an inner conductor layer, an insulating medium layer, an outer conductor layer and a sheath. The inner conductor layer is combined by an aluminum core, a copper foil and a plurality of silver foil strips, wherein the silver foil strips are attached to the outer surface of the copper foil through first conductive glue and are aligned with corresponding leakage holes on the outer conductor layer, so that the position of the leakage signal has better physical performance. In the scheme, the arrangement area proportion of the silver foil strips is low, and the thickness is thin, so that the comprehensive price of the inner conductor layer per meter is lower than that of a traditional pure copper inner conductor, and the signal quality is obviously better than that of a traditional copper-clad aluminum inner conductor, and the performance and cost are considered.

Description

Technical Field

[0001] This application belongs to the field of communication cable technology, and in particular relates to a low-loss leaky coaxial cable. Background Technology

[0002] Existing leaky coaxial cables are gradually starting to use copper-clad aluminum inner conductors to control product costs. However, this approach changes the inner conductor from pure copper to an aluminum-based structure with copper as a secondary component. Aluminum has much lower conductivity than copper, resulting in higher losses and making it difficult to apply to mid-to-high-end communication scenarios. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a low-loss leaky coaxial cable to overcome the shortcomings of existing leaky coaxial cables.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A low-loss leakage coaxial cable, comprising, from the inside out:

[0006] The inner conductor layer includes an aluminum core, a copper foil, and several silver foil strips. The copper foil is longitudinally wrapped around the aluminum core, and the several silver foil strips are attached to the outer surface of the copper foil and arranged periodically along the extension direction of the copper foil. The silver foil strips are fixed to the copper foil by a first conductive adhesive.

[0007] Insulating dielectric layer;

[0008] An outer conductor layer having a plurality of leakage holes arranged along the extension direction of the outer conductor layer and corresponding one-to-one with the silver foil strip along the extension direction of the copper foil, wherein the silver foil strip is aligned with the corresponding leakage hole along the radial direction of the copper foil;

[0009] jacket.

[0010] Preferably, in the low-loss leakage coaxial cable of the present invention, the insulating dielectric layer is made of a semi-transparent foam material.

[0011] Preferably, in the low-loss leakage coaxial cable of the present invention, the semi-transparent foaming material is semi-transparent porous polytetrafluoroethylene, semi-transparent perfluoro foaming resin, or semi-transparent polycarbonate resin.

[0012] Preferably, in the low-loss leakage coaxial cable of the present invention, the inner surface of the copper foil is fixed to the aluminum core by the first conductive adhesive or the second conductive adhesive.

[0013] Preferably, in the low-loss leakage coaxial cable of the present invention, the length of the silver foil strip projected along the extension direction of the copper foil is less than half the circumference of the copper foil.

[0014] Preferably, in the low-loss leakage coaxial cable of the present invention, the entire inner surface of the silver foil strip is frosted.

[0015] Preferably, in the low-loss leakage coaxial cable of the present invention, the first conductive adhesive is coated between the entire inner surface of the silver foil strip and the copper foil.

[0016] Preferably, in the low-loss leakage coaxial cable of the present invention, the first conductive adhesive is an epoxy-based silver conductive adhesive.

[0017] Preferably, in the low-loss leakage coaxial cable of the present invention, the temperature resistance range of the epoxy-based silver conductive adhesive is -40℃ to 150℃.

[0018] Preferably, in the low-loss leakage coaxial cable of the present invention, the inclination direction of the silver foil strip is consistent with the leakage hole.

[0019] The beneficial effects of this invention are as follows: In this invention, the inner conductor layer combines an aluminum core, copper foil, and several silver foil strips. The silver foil strips are attached to the outer surface of the copper foil using a first conductive adhesive and aligned with the corresponding leakage holes on the outer conductor layer. This results in superior physical properties for the location of the leakage signal. In this design, the silver foil strips occupy a smaller area and are thinner, thus the overall cost per meter of the inner conductor layer is lower than that of traditional pure copper inner conductors, while the signal quality is significantly better than that of traditional copper-clad aluminum inner conductors, achieving a balance between performance and cost. Attached Figure Description

[0020] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a 3D structural diagram of a low-loss leakage coaxial cable.

[0022] Figure 2 This is a schematic diagram showing the extension direction of a low-loss leakage coaxial cable;

[0023] Figure 3 yes Figure 2 A cross-sectional view of a low-loss leakage coaxial cable AA.

[0024] Figure 4 yes Figure 2 A cross-sectional view of a low-loss leakage coaxial cable BB in the image;

[0025] Figure 5 This is a schematic diagram of the process of attaching silver foil strips to copper foil.

[0026] The attached figures are labeled as follows:

[0027] 1. Inner conductor layer; 11. Aluminum core; 12. Copper foil; 13. Silver foil strip;

[0028] 2. Insulating dielectric layer;

[0029] 3. Outer conductor layer; 31. Leakage hole;

[0030] 4. Sheath;

[0031] 100. Low-loss leakage coaxial cable. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0033] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In the accompanying drawings, for clarity, the length, thickness, area, volume, gap dimensions, and relative dimensions of components, as well as the included angles and relative positional relationships between components, may be exaggerated. The same reference numerals denote the same elements throughout the drawings.

[0036] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] This embodiment provides a low-loss leakage coaxial cable 100, such as Figures 1-4 As shown, it includes, from the inside out, the following layers arranged in sequence: inner conductor layer 1, insulating dielectric layer 2, outer conductor layer 3, and sheath 4.

[0038] The inner conductor layer 1 includes an aluminum core 11, a copper foil 12, and several silver foil strips 13. The copper foil 12 is longitudinally wrapped around the aluminum core 11, and the silver foil strips 13 are attached to the outer surface of the copper foil 12 and periodically arranged along the extension direction of the copper foil 12. The silver foil strips 13 are fixed to the copper foil 12 by a first conductive adhesive. The extension direction of the low-loss leakage coaxial cable 100 is also the extension direction of the copper foil 12 and the outer conductor layer 3.

[0039] The outer conductor layer 3 has a plurality of leakage holes 31, which are arranged along the extending direction of the outer conductor layer 3 and correspond one-to-one with the silver foil strips 13 along the extending direction of the copper foil 12. This one-to-one correspondence means that for every silver foil strip 13 along the extending direction of the copper foil 12, there is a leakage hole 31 in the corresponding position of the outer conductor layer 3. Figure 4 As shown, the silver foil strip 13 is aligned radially with the corresponding leakage hole 31 along the copper foil 12, which enables the high-frequency signal to form the shortest and most direct radiation channel on the surface transmission path dominated by the skin effect. After the signal is converged and transmitted on the surface of the inner conductor layer 1 by the high-conductivity silver foil strip 13, it can be radiated outward through the corresponding leakage hole 31 without offset, reflection, or diffraction, significantly reducing the reflection loss and transmission attenuation of the signal between conductor layers, and improving the radiation efficiency and signal coverage uniformity.

[0040] In this embodiment, the inner conductor layer 1 combines an aluminum core 11, copper foil 12, and several silver foil strips 13. The silver foil strips 13 are attached to the outer surface of the copper foil 12 with a first conductive adhesive and aligned with the corresponding leakage holes 31 on the outer conductor layer 3. This results in better physical properties for the location of the leakage signal. In this design, the silver foil strips 13 occupy a smaller area and are thinner, thus the overall cost per meter of the inner conductor layer 1 is lower than that of traditional pure copper inner conductors, while the signal quality is significantly better than that of traditional copper-clad aluminum inner conductors, achieving a balance between performance and cost.

[0041] Preferably, the insulating dielectric layer 2 is made of a semi-transparent foamed material. The semi-transparent insulating dielectric allows for visible alignment during assembly, further ensuring the alignment accuracy of the leakage hole 31 and the silver foil strip 13, improving finished product consistency and long-term reliability. In actual processing, since the arrangement cycle of the leakage hole 31 and the silver foil strip 13 is the same, during the alignment process, as long as the alignment of the leakage hole 31 at the end of the first longitudinally wrapped outer conductor layer 3 with the silver foil strip 13 is confirmed, subsequent leakage holes 31 and silver foil strips 13 can be guaranteed to be aligned. Furthermore, based on the visibility characteristics of the semi-transparent insulating dielectric, if misalignment of the leakage hole 31 and the silver foil strip 13 is detected during the process, the production line can be stopped and corrected promptly.

[0042] In this embodiment, before the longitudinal wrapping process of copper foil 12, a pretreatment step of copper foil 12 is required, that is, attaching silver foil strips 13 to copper foil 12. For example... Figure 5As shown, during the process of attaching silver foil strips 13 to copper foil 12, the copper foil 12 is in a flattened state. The copper foil 12 or silver foil strips 13 are coated with the first conductive adhesive by conveying. The silver foil strips 13 can be obtained one by one from a long coil of silver foil material, and are attached sequentially along the extension direction of the copper foil 12. After the copper foil 12 is pre-treated, the feeding speed needs to be controlled to ensure that the first conductive adhesive has cured completely when the copper foil 12 is wrapped longitudinally.

[0043] Preferably, the semi-transparent foam material is semi-transparent porous polytetrafluoroethylene (PTFE), semi-transparent perfluoropolymer (FEP / PFA), or semi-transparent polycarbonate (PC) resin. Replacing traditional white opaque foam materials, it has a semi-transparent milky white or light transparent appearance, allowing observation of the position of the silver foil strip 13 on the surface of the inner conductor layer 1. Without the need for additional inspection tools, the position of the silver foil strip 13 and the leakage hole 31 of the outer conductor layer 3 can be quickly aligned during assembly, improving assembly efficiency and preventing misalignment.

[0044] Preferably, the inner surface of the copper foil 12 is fixed to the aluminum core 11 using a first conductive adhesive or a second conductive adhesive. The second conductive adhesive and the first conductive adhesive can be the same type of conductive adhesive or different types. When the second conductive adhesive and the first conductive adhesive can be the same type, preferably, both surfaces of the copper foil 12 are coated with the conductive adhesive. This allows for the application of conductive adhesive on both sides during the copper foil 12 transport process, facilitating the longitudinal wrapping of the copper foil 12 onto the aluminum core 11 and simplifying the copper foil 12 pretreatment steps. The advantage of this solution is that it eliminates the welding process during the longitudinal wrapping of the copper foil 12, replacing it with conductive adhesive for fixation to the aluminum core 11, without increasing the difficulty of conductive adhesive application.

[0045] Preferably, such as Figure 4 As shown, the length of the silver foil strip 13 projected along the extension direction of the copper foil 12 is less than half the circumference of the copper foil 12. That is, the angle range of the silver foil strip 13 covering the surface of the copper foil 12 does not exceed 180 degrees, which fully meets the signal transmission range and effectively controls the amount of silver foil strip 13 used, thus controlling the cost of consumables.

[0046] Preferably, the entire inner surface of the silver foil strip 13 is frosted, which helps to improve the fixing effect of the conductive adhesive and avoids displacement during the process.

[0047] Preferably, the first conductive adhesive is coated on the entire inner surface of the silver foil strip 13 between the silver foil strip 13 and the copper foil 12 to ensure the stability of the silver foil strip 13 and to increase the conductivity between the silver foil strip 13 and the copper foil 12.

[0048] Preferably, in the low-loss leakage coaxial cable of this embodiment, the conductive adhesive is an epoxy-based silver conductive adhesive, which has good conductivity.

[0049] Preferably, in the low-loss leakage coaxial cable of this embodiment, the epoxy-based silver conductive adhesive has a temperature resistance range of -40℃ to 150℃, which can withstand the high-temperature environment during the extrusion process of the insulating dielectric layer 2.

[0050] Preferably, such as Figure 1 As shown, the tilt direction of the silver foil strip 13 is consistent with that of the leakage hole 31, so as to better correspond with the leakage hole 31 and avoid wasting material area.

[0051] Taking the low-loss leakage coaxial cable 100 of this embodiment with a 13mm diameter inner conductor as an example, and specifying the cost per meter, the total cost per unit length of the inner conductor layer 1 in this solution is approximately 7.52 + 1.46 + 1.41 + 39.76 ≈ 49.15 yuan / meter. In contrast, the cost of a traditional pure copper inner conductor is approximately 97 yuan / meter. Therefore, the low-loss leakage coaxial cable 100 of this embodiment has a lower cost than products with pure copper inner conductors.

[0052] The core performance parameters and key indicators of this product are as follows:

[0053] 1. Transmission loss: Within the operating frequency range of 0.8~2.5GHz, the transmission loss per unit length is ≤2.8dB / 100m; at a frequency of 1GHz, the transmission loss is ≤1.9dB / 100m, meeting the requirements of GB / T17737.1-2008 standard and adapting to the transmission needs of mainstream communication signals.

[0054] 2. Characteristic impedance: Standard 50Ω, impedance deviation ≤±2Ω, excellent consistency; affected by temperature and humidity, impedance drift ≤0.5Ω, ensuring signal transmission without reflection or distortion, and compatible with various communication equipment interfaces.

[0055] 3. Signal leakage efficiency: Signal leakage efficiency ≥88%, signal coverage uniformity ≤3dB, no obvious coverage blind spots.

[0056] 4. Mechanical performance: Minimum bending radius ≤150mm, after repeated bending 100 times, transmission loss change ≤0.3dB / 100m, no conductor damage or silver foil strip 13 falling off, suitable for complex laying scenarios.

[0057] 5. Environmental resistance: Temperature range of -40℃ to 150℃, meeting the temperature resistance requirements of epoxy silver-based conductive adhesives and sheath materials; after salt spray corrosion, the surface is free of rust and the transmission loss change is ≤0.2dB / 100m; after UV aging, the sheath 4 is free of cracks and the conductivity of the inner conductor is not significantly reduced.

[0058] 6. Electrical conductivity: DC resistivity of the inner conductor ≤ 2.1 × 10⁻⁶ -8 Ω·m, the contact resistance at the joint between the silver foil strip 13 and the copper foil 12 is ≤5×10 Ω·m. -4Ω balances low loss and conductivity stability.

[0059] Based on the above-described preferred embodiments according to this application, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-loss leakage coaxial cable, characterized in that, Including the following, arranged sequentially from the inside out: The inner conductor layer (1) includes an aluminum core (11), a copper foil (12), and several silver foil strips (13). The copper foil (12) is longitudinally wrapped around the aluminum core (11), and several silver foil strips (13) are attached to the outer surface of the copper foil (12) and periodically arranged along the extension direction of the copper foil (12). The silver foil strips (13) are fixed to the copper foil (12) by a first conductive adhesive. Insulating dielectric layer (2); The outer conductor layer (3) has a plurality of leakage holes (31), the plurality of leakage holes (31) are arranged along the extension direction of the outer conductor layer (3) and correspond one-to-one with the silver foil strip (13) along the extension direction of the copper foil (12), the silver foil strip (13) is aligned with the corresponding leakage hole (31) along the radial direction of the copper foil (12); Sheath (4).

2. The low-loss leakage coaxial cable according to claim 1, characterized in that, The insulating dielectric layer (2) is made of a semi-transparent foam material.

3. The low-loss leakage coaxial cable according to claim 2, characterized in that, The semi-transparent foam material is a semi-transparent porous polytetrafluoroethylene, a semi-transparent perfluoro foam resin, or a semi-transparent polycarbonate resin.

4. The low-loss leakage coaxial cable according to claim 1, characterized in that, The inner surface of the copper foil (12) is fixed to the aluminum core (11) by the first conductive adhesive or the second conductive adhesive.

5. The low-loss leakage coaxial cable according to claim 1, characterized in that, The length of the silver foil strip (13) projected along the extension direction of the copper foil (12) is less than half the circumference of the copper foil (12).

6. The low-loss leakage coaxial cable according to claim 1, characterized in that, The entire inner surface of the silver foil strip (13) is frosted.

7. The low-loss leakage coaxial cable according to claim 6, characterized in that, The first conductive adhesive is coated between the entire inner surface of the silver foil strip (13) and the copper foil (12).

8. The low-loss leakage coaxial cable according to claim 7, characterized in that, The first conductive adhesive is an epoxy-based silver conductive adhesive.

9. The low-loss leakage coaxial cable according to claim 8, characterized in that, The temperature resistance range of the epoxy-based silver conductive adhesive is -40℃ to 150℃.

10. The low-loss leakage coaxial cable according to any one of claims 1-9, characterized in that, The tilt direction of the silver foil strip (13) is consistent with that of the leakage hole (31).

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