Low-loss extra-flexible coaxial cable with embossing insulated by physical foaming and wrapped by copper foil tapes

Abstract

The invention relates to a low-loss extra-flexible coaxial cable with embossing insulated by physical foaming and wrapped by copper foil tapes, which successively comprises a central conductor, a physical foaming polyethylene insulating layer, a wrapped or longitudinally covered embossing outer conductor layer with copper foils, and an external protective layer from inside to outside, wherein the outer conductor layer is formed by using the following method: the insulating layer is tightly wrapped by the copper foils or copper foil tapes by a wrapped or longitudinally covered way, and then a threaded groove is rolled through spiral embossing so as to form an outer conductor. Because the outer conductor is formed by the wrapped or longitudinally covered way with the copper foils, the coverage rate of the outer conductor layer is 100 percent, and the shielding performance is extra good; because the outer conductor has an embossing structure, the cable has enough extendable space in the process of bending the cable, thereby realizing the real extra flexible performance of the coaxial cable, wherein the minimal bending radius is 5mm; compared with the coaxial cable prepared by fluoro-plastics through using a special processing method, the coaxial cable of the invention has the advantages of simple manufacturing method and low cost; and the coaxial cable of the invention can greatly replace existing semi-flexible and semi-rigid coaxial cables so as to meet the requirements for wide coverage of 3G communication.

Description

technical field [0001] The invention relates to a physically foamed insulated copper foil with embossed low-loss ultra-flexible coaxial cable, which comprises an inner conductor, a physically foamed insulating layer, an outer conductor and a sheath layer. Background technique [0002] The key factor that currently restricts the large-scale coverage of 3G communication is: the manufacturing cost of the current semi-flexible and semi-rigid coaxial cables is too high. The general manufacturing process of semi-flexible and semi-rigid coaxial cable core wires is as follows: PTFE powder is used for extrusion molding, and then high-temperature sintering molding. Because the temperature of the sintering process is too high, the center conductor must be silver-plated. Due to the intermittent pushing process, the core length is limited. And because the dielectric constant of PTFE material is 2.1, the cable loss made of this kind of insulating material is relatively large. The outer...

AI Technical Summary

Problems solved by technology

At present, the outer conductor of the semi-rigid wire needs to use a copper tube with a thickness greater than 0.20mm, which is more expensive, has poor flexibility, and is difficult to achieve large-length continuous production.

However, other coaxial cables wrapped with copper foil or copper foil tape have poor flexibility and are easy to crack after being bent, so they cannot achieve the real super soft effect.

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