Leaky coaxial cable of dual-steel wire enhanced internal conductor and its making method

Abstract

The invention relates to a leaky coaxial with a double steel wire reinforced inner conductor and a manufacturing method thereof. The leaky coaxial inner conductor is supported by a plastic hollow tube with reinforced steel wires on both sides as a mechanical strength support body, and two reinforced steel wires are connected with the plastic hollow The centerlines of the pipes should be on the same plane to ensure that the leakage coaxial does not twist during laying. Copper foil composite tape is longitudinally wrapped on the outer wall of the plastic empty pipe and bonded by hot air to form a leaky coaxial inner conductor, which can save a lot of copper. A physically foamed insulating layer is extruded outside the inner conductor. Copper strips with various periodic radiation grooves are longitudinally rolled on the physical foam insulation layer to form a leaky coaxial outer conductor, and the outer conductor is extruded with a plastic sheath. The biggest advantage of the invention is that the amount of copper used in the inner conductor is greatly reduced, the tensile strength is greatly increased, and it can ensure that the radiation slot is always aligned with the antenna of the locomotive, the coupling performance is stable and reliable, and it has great economic benefits.

Description

technical field [0001] The invention relates to the technical field of rail transit vehicle-ground communication. Specifically, it is a leaky coaxial with double steel wire reinforced inner conductor and its manufacturing method, which is applied in high-speed railway vehicle-to-ground communication. Background technique [0002] At present, there are two kinds of inner conductors of leaky coaxial cables used in rail transit vehicle-to-ground communication. One is metal copper tubes, which need to consume hundreds of kilograms of high-purity electrolytic copper. Due to the increasing scarcity of copper resources, the price of copper has increased several times in the past two years, so the inner conductor made of copper tubes is expensive and must be improved. Another kind of inner conductor is composed of copper-clad aluminum wire. Its tensile strength is low, and it is easy to stretch and deform during construction, which makes the characteristics of the entire leaky coax...

AI Technical Summary

Problems solved by technology

One is metal copper tubes, which need to consume hundreds of kilograms of high-purity electrolytic copper. Due to the increasingly scarce copper resources, the price of copper has increased several times in the past two years, so the inner conductor made of copper tubes is expensive and must be improved.

Another kind of inner conductor is composed of copper-clad aluminum wire. Its tensile strength is low, and it is easy to stretch and deform during construction, which makes the characteristics of the entire leaky coaxial line worse. The leaky coaxial line with the above two inner conductors is in the It is easy to reverse during the construction process, so that the radiation trough of the leaky coaxial line is not in a straight line, causing large fluctuations in the coupling loss between the leaky coaxial line and the locomotive antenna, and greatly increasing the bit error rate of the vehicle-ground communication

In addition, neither of these two kinds of leaky coaxes can be made into a comprehensive optical cable containing optical fiber bundles, and it is impossible to make optical fiber transmission and leaky cable radiation transmission organically form a highly stable vehicle-to-ground communication system

Images