A coaxial microwave transmission line for radio frequency signals

Abstract

This utility model discloses a coaxial microwave transmission line for radio frequency signals, belonging to the field of microwave transmission line technology. Key technical features include a line body and connectors at both ends of the line body. The line body comprises an inner conductor, an insulating dielectric layer, an outer conductor, and a sheath, arranged sequentially from the inside out. An annular groove on the surface of the inner conductor, in conjunction with thermally conductive silicone grease, forms an efficient heat dissipation channel, accelerating the dissipation of heat generated during high-frequency signal transmission. This prevents signal attenuation or transmission instability due to overheating, ensuring signal integrity in high-power, long-term operating scenarios. Furthermore, the reinforcing ring embedded in the insulating dielectric layer alternates with the annular groove of the inner conductor, forming a composite structure of rigid support and flexible buffer, improving the overall bending and impact resistance of the transmission line, reducing structural deformation under external forces, and ensuring the stability of the signal transmission path.

Description

Technical Field

[0001] This utility model relates to the field of microwave transmission line technology, and in particular to a coaxial microwave transmission line for radio frequency signals. Background Technology

[0002] Coaxial microwave transmission lines are commonly used to transmit radio frequency and microwave signals. They have advantages such as high transmission efficiency and strong anti-interference ability, and are widely used in communication, radar, navigation and other fields.

[0003] Existing coaxial microwave transmission lines have some drawbacks during use: on the one hand, the inner conductor generates a lot of heat when transmitting high-frequency signals, and the heat dissipation performance of the existing structure is poor, which can easily lead to unstable signal transmission; on the other hand, the structural strength of the transmission line is insufficient, and it is easy to deform when bent or subjected to external impact, which affects the signal transmission effect; in addition, the shielding performance needs to be further improved, and external electromagnetic interference can easily affect the transmitted signal.

[0004] To address this, a coaxial microwave transmission line for radio frequency signals is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a coaxial microwave transmission line for radio frequency signals, which can solve the problems of existing coaxial microwave transmission lines generating a lot of heat when transmitting high-frequency signals, poor heat dissipation performance of existing structures, which easily leads to unstable signal transmission, insufficient structural strength of the transmission line, easy deformation when bent or subjected to external impact, affecting the signal transmission effect, and shielding performance needing further improvement, as external electromagnetic interference can easily affect the transmitted signal.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a coaxial microwave transmission line for radio frequency signals, comprising a line body and connectors disposed at both ends of the line body. The line body comprises an inner conductor, an insulating dielectric layer, an outer conductor, and a sheath, wherein the inner conductor, insulating dielectric layer, outer conductor, and sheath are arranged sequentially from the inside to the outside. The surface of the inner conductor is provided with a plurality of annular grooves, and the interior of the annular grooves is filled with thermally conductive silicone grease. The interior of the insulating dielectric layer is embedded with a plurality of reinforcing rings, and the reinforcing rings and the annular grooves are alternately distributed.

[0007] The outer conductor includes an inner shielding mesh and an outer metal tube, and a buffer layer is provided between the inner shielding mesh and the outer metal tube.

[0008] Preferably, the inner shielding mesh is woven from tin-plated copper wire, and the weaving density is not less than 95%.

[0009] Preferably, the outer metal tube is made of seamless copper tube, and the inner wall of the outer metal tube is tightly fitted with the buffer layer.

[0010] Preferably, the buffer layer is made of silicone material, and the interior of the buffer layer has a plurality of honeycomb-shaped buffer pore structures.

[0011] Preferably, the surface of the outer metal tube is plated with a nickel layer, and the thickness of the nickel layer is 5-10 μm.

[0012] Preferably, the inner conductor is made of oxygen-free copper and its surface is plated with a silver layer.

[0013] Preferably, the insulating dielectric layer is made of foamed polytetrafluoroethylene material, and the interior of the insulating dielectric layer has a number of micropores evenly distributed.

[0014] Preferably, an adhesive layer is provided between the insulating dielectric layer and the inner conductor, and the adhesive layer is made of epoxy resin adhesive.

[0015] Preferably, the sheath is made of weather-resistant polyvinyl chloride material, and the surface of the sheath is provided with anti-slip texture.

[0016] Preferably, the inner wall of the sheath is provided with a flame-retardant layer, and the flame-retardant layer is composed of magnesium hydroxide flame-retardant coating.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This application forms an efficient heat dissipation channel by using the annular groove on the surface of the inner conductor in conjunction with thermal grease, which accelerates the dissipation of heat generated during high-frequency signal transmission, avoids signal attenuation or transmission instability due to overheating, and ensures signal integrity in high-power, long-term working scenarios. Furthermore, the reinforcing ring embedded in the insulating dielectric layer and the annular groove of the inner conductor are alternately distributed to form a composite structure of rigid support and flexible buffer, which improves the overall bending and impact resistance of the transmission line, reduces structural deformation under external force, and ensures the stability of the signal transmission path.

[0019] 2. This application adopts a double shielding design of inner shielding mesh and outer metal tube for the outer conductor, combined with the buffer layer between the two, which can effectively block external electromagnetic interference and reduce the radiation of internal signals outward. Especially in complex electromagnetic environments (such as base stations and radar systems), it can significantly reduce the risk of signal interference. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the radio frequency signal line and coaxial microwave transmission line of this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of the line body of this utility model;

[0022] Figure 3This is a schematic diagram showing the connection between the insulating medium and the inner conductor of this utility model;

[0023] Figure 4 This is a schematic cross-sectional view of the outer conductor of this utility model;

[0024] Figure 5 This is a schematic diagram showing the connection between the sheath and the outer conductor of this utility model.

[0025] In the diagram, 1 is the wire body; 2 is the connector; 3 is the inner conductor; 4 is the insulating dielectric layer; 5 is the outer conductor; 51 is the inner shielding mesh; 52 is the outer metal tube; 53 is the buffer layer; 6 is the sheath; 7 is the annular groove; 8 is the reinforcing ring; 9 is the nickel layer; 10 is the silver layer; 11 is the adhesive layer; and 12 is the flame retardant layer. Detailed Implementation

[0026] 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.

[0027] Please see Figure 1-5 The present invention provides the following technical solution:

[0028] A coaxial microwave transmission line for radio frequency signals includes a line body 1 and connectors 2 at both ends of the line body 1. The line body 1 includes an inner conductor 3, an insulating dielectric layer 4, an outer conductor 5, and a sheath 6, which are arranged sequentially from the inside to the outside. The surface of the inner conductor 3 has a plurality of annular grooves 7, and the interior of the annular grooves 7 is filled with thermally conductive silicone grease. The interior of the insulating dielectric layer 4 has a plurality of reinforcing rings 8, and the reinforcing rings 8 and the annular grooves 7 are alternately distributed.

[0029] The outer conductor 5 includes an inner shielding mesh 51 and an outer metal tube 52, and a buffer layer 53 is provided between the inner shielding mesh 51 and the outer metal tube 52.

[0030] In this embodiment: the annular groove 7 on the surface of the inner conductor 3, in conjunction with thermal grease, forms an efficient heat dissipation channel, accelerating the dissipation of heat generated during high-frequency signal transmission, avoiding signal attenuation or transmission instability due to overheating, and ensuring signal integrity in high-power, long-term operating scenarios. Furthermore, the reinforcing ring 8 embedded in the insulating dielectric layer 4 and the annular groove 7 of the inner conductor 3 are alternately distributed, forming a composite structure of rigid support and flexible buffer, improving the overall bending and impact resistance of the transmission line, reducing structural deformation under external forces, and ensuring the stability of the signal transmission path. The outer conductor 5 adopts a double shielding design with an inner shielding mesh 51 and an outer metal tube 52, combined with the buffer layer 53 between them, which can effectively block external electromagnetic interference and reduce the radiation of internal signals outward. Especially in complex electromagnetic environments (such as base stations and radar systems), it can significantly reduce the risk of signal interference.

[0031] Specifically, such as Figure 4 As shown, the inner shielding mesh 51 is woven from tin-plated copper wire, and the weaving density is not less than 95%.

[0032] Specifically, such as Figure 4 As shown, the outer metal tube 52 is made of seamless copper tube, and the inner wall of the outer metal tube 52 is tightly fitted with the buffer layer 53.

[0033] Specifically, such as Figure 4 As shown, the buffer layer 53 is made of silicone material, and the interior of the buffer layer 53 has a number of honeycomb-shaped buffer holes.

[0034] Specifically, such as Figure 4 As shown, the surface of the outer metal tube 52 is plated with a nickel layer 9, and the thickness of the nickel layer 9 is 5-10 μm.

[0035] In this embodiment: the inner shielding mesh 51 is woven with tin-plated copper wire, and the weaving density is not less than 95%, ensuring the shielding mesh's electromagnetic wave blocking rate and reducing the penetration of external low-frequency and high-frequency electromagnetic interference into the shielding layer. In particular, it has a significant suppression effect on spurious signals in the communication frequency band, improving the purity of signal transmission. The outer metal tube 52 is made of seamless copper tube, and the seamless design avoids the electromagnetic leakage hazards of traditional splicing structures, ensuring the integrity of the shielding. The silicone buffer layer 53 has good elasticity and temperature resistance, which can absorb the mechanical energy generated when the transmission line bends and vibrates, reducing the impact on the inner shielding mesh 51 and the outer metal tube 52. The nickel layer 9 on the surface of the outer metal tube 52 forms a dense oxide film, which can prevent moisture and corrosive gases from contacting the copper tube, significantly improving the corrosion resistance of the transmission line in humid and acidic / alkaline environments.

[0036] Specifically, such as Figure 3 As shown, the inner conductor 3 is made of oxygen-free copper, and the surface of the inner conductor 3 is plated with a silver layer 10.

[0037] In this embodiment, the inner conductor 3 is made of oxygen-free copper, whose high purity reduces the skin effect loss during signal transmission, ensuring low attenuation transmission of high-frequency signals. The silver plating layer 10 on the surface further reduces the surface resistance of the conductor, reducing energy loss during signal transmission. At the same time, the oxidation resistance of the silver layer 10 also extends the service life of the inner conductor 3, making it particularly suitable for high-frequency microwave signal transmission scenarios.

[0038] Specifically, such as Figure 2 As shown, the insulating dielectric layer 4 is made of foamed polytetrafluoroethylene material, and several micro-pores are evenly distributed inside the insulating dielectric layer 4.

[0039] Specifically, such as Figure 3 As shown, an adhesive layer 11 is provided between the insulating dielectric layer 4 and the inner conductor 3, and the adhesive layer 11 is made of epoxy resin adhesive.

[0040] In this embodiment: foamed polytetrafluoroethylene is used as the insulating dielectric layer 4. Its low dielectric constant reduces dielectric loss during signal transmission and reduces signal attenuation. The adhesive layer 11 made of epoxy resin adhesive can firmly bond the inner conductor 3 and the insulating dielectric layer 4, avoiding relative sliding between the two due to vibration and temperature difference, ensuring the coaxiality of the inner conductor 3 and the insulating dielectric layer 4, and reducing impedance mismatch caused by structural offset.

[0041] Specifically, such as Figure 2 As shown, the sheath 6 is made of weather-resistant polyvinyl chloride material, and the surface of the sheath 6 is provided with anti-slip texture.

[0042] Specifically, such as Figure 5 As shown, the inner wall of the sheath 6 is provided with a flame-retardant layer 12, and the flame-retardant layer 12 is made of magnesium hydroxide flame-retardant coating.

[0043] In this embodiment: the weather-resistant PVC sheath 6 can resist the corrosion of environmental factors such as ultraviolet rays, ozone, high and low temperatures, and extend the service life of the transmission line in outdoor or harsh environments; the flame-retardant layer 12 composed of magnesium hydroxide flame-retardant coating can decompose and absorb heat at high temperatures, inhibit the combustion reaction of the sheath 6, delay the spread of flames, and improve the safety of the transmission line in high-temperature or open flame environments.

[0044] Working Principle: In microwave transmission line applications, the inner conductor 3 serves as the core for signal transmission. When radio frequency or microwave signals pass through the inner conductor 3, the silver layer 10 reduces surface resistance, ensuring low signal attenuation along the inner conductor 3. During high-frequency signal transmission, the inner conductor 3 generates heat due to resistance. The annular groove 7 on the surface of the inner conductor 3 is filled with thermally conductive silicone grease, which rapidly conducts the heat to the outer insulating dielectric layer 4. The insulating dielectric layer 4 further transfers the heat to the outer conductor 5 and sheath 6, ultimately dissipating it to the external environment, preventing localized overheating of the inner conductor 3 that could lead to signal distortion. When the transmission line is subjected to bending or impact, the reinforcing ring 8 within the insulating dielectric layer 4 provides rigid support, alternating with the annular groove 7 of the inner conductor 3 to form stress dispersion zones. The reinforcing ring 8 bears the main external force, while the annular groove 7 buffers stress through minor deformation, preventing the inner conductor 3 or the insulating dielectric layer 4 from breaking due to excessive localized stress. When external electromagnetic interference attempts to penetrate the transmission line... First, the outer seamless copper tube blocks the signal. The continuous structure of the copper tube forms a closed shielding cavity, reflecting most of the low-frequency electromagnetic waves. The remaining high-frequency interference is intercepted by the inner tin-plated copper wire shielding mesh. The braiding density of over 95% ensures that the interference signal cannot penetrate through the mesh and is ultimately absorbed or guided away by the shielding layer. The electromagnetic radiation generated by the signal transmitted by the inner conductor 3 is constrained by the inner shielding mesh 51. The outer metal tube 52 further prevents radiation leakage, avoiding interference with surrounding equipment. In addition, the silicone material of the buffer layer 53 has certain wave absorption characteristics, which can absorb some of the leaked electromagnetic energy and enhance the overall shielding effect. During daily use, the sheath 6 resists outdoor ultraviolet rays, high and low temperature alternation and other environmental corrosion. The nickel layer 9 on the surface of the outer metal tube 52 forms a protective film, isolating moisture and corrosive gases, preventing the copper tube from rusting, and ensuring that the shielding performance does not decrease during long-term use. If exposed to high temperature or open flame, the flame-retardant layer 12 on the inner wall of the sheath 6 decomposes and absorbs heat, inhibiting the combustion of the sheath 6 and delaying the spread of fire.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coaxial microwave transmission line for radio frequency signals, comprising a line body (1) and connectors (2) disposed at both ends of the line body (1), characterized in that: The wire (1) includes an inner conductor (3), an insulating dielectric layer (4), an outer conductor (5), and a sheath (6). The inner conductor (3), the insulating dielectric layer (4), the outer conductor (5), and the sheath (6) are arranged sequentially from the inside to the outside. The surface of the inner conductor (3) is provided with several annular grooves (7), and the interior of the annular grooves (7) is filled with thermally conductive silicone grease. The interior of the insulating dielectric layer (4) is embedded with several reinforcing rings (8), and the reinforcing rings (8) and the annular grooves (7) are alternately distributed. The outer conductor (5) includes an inner shielding mesh (51) and an outer metal tube (52), and a buffer layer (53) is provided between the inner shielding mesh (51) and the outer metal tube (52).

2. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The inner shielding mesh (51) is woven from tin-plated copper wire with a weaving density of not less than 95%.

3. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The outer metal tube (52) is made of seamless copper tube, and the inner wall of the outer metal tube (52) is tightly fitted with the buffer layer (53).

4. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The buffer layer (53) is made of silicone material, and the interior of the buffer layer (53) is provided with a number of honeycomb-shaped buffer holes.

5. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The outer metal tube (52) is plated with a nickel layer (9), and the thickness of the nickel layer (9) is 5-10 μm.

6. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The inner conductor (3) is made of oxygen-free copper and the surface of the inner conductor (3) is plated with a silver layer (10).

7. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The insulating dielectric layer (4) is made of foamed polytetrafluoroethylene material, and a number of micro pores are evenly distributed inside the insulating dielectric layer (4).

8. The coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: An adhesive layer (11) is provided between the insulating dielectric layer (4) and the inner conductor (3), and the adhesive layer (11) is made of epoxy resin adhesive.

9. A coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The sheath (6) is made of weather-resistant polyvinyl chloride material, and the surface of the sheath (6) is provided with anti-slip texture.

10. A coaxial microwave transmission line for radio frequency signals according to claim 1, characterized in that: The inner wall of the sheath (6) is provided with a flame-retardant layer (12), and the flame-retardant layer (12) is made of magnesium hydroxide flame-retardant coating.

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