The human society in the 21st century will be the information age, the network age, and the multimedia age. Disadvantages The high frequency characteristics are not good; due to the adverse effects of moisture absorption on the high frequency characteristics; there are decomposition residues in the extruder; the extrusion temperature range is narrow. The choice of the thickness of the outer conductor of the coaxial cable for mobile communication base stations is related to its minimum working frequency and mechanical strength requirements. At the same time, the production cost should be considered and the copper consumption should be saved. In terms of electrical performance, the choice of the thickness of the outer conductor mainly depends on when the thickness of the outer conductor changes, the fluctuation of its attenuation should be as small as possible. Thinner copper strips can save materials, but too thin will cause the copper strips to be too soft. Ring rolling stacks will be produced during crimping. Enterprises should ask the suppliers for thickness and hardness requirements after groping. Usually the copper strip thickness is 0.25 ~ 0.50mm. The outer sheath of the coaxial cable used for the sheath mobile communication base station uses a black environment-resistant crack-resistant low-density polyethylene sheath material.
The rolling quality of the high-foam insulation layer and the ring thread of the outer conductor is strictly controlled. It has been discussed in detail in many published papers, this article only briefly summarizes the key issues, and will not repeat the details: the quality control of the inner conductor except for the surface finish of the copper-clad aluminum wire that has been mentioned above In addition to the uniformity (concentricity) of the copper layer and the high purity of copper, during the foam insulation process, care should also be taken to avoid unevenness when the frequency conversion induction preheating device preheats the inner conductor. According to the actual production situation, if the capacitance is monitored during foam extrusion, the periodic unevenness can be immediately found and measures taken, which can reduce the scrap rate of the finished cable.
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