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铜包铝是CATV工业同轴电缆内导体的标准材料。因为在这种高频应用中,信号在导体的表面传播,所以可用铜包铝线代替铜线,又因为铜包铝线的重量只有铜线的37％,所以这种替换可明显降低电线的成本,重量轻还允许采用低密度的介质,因此可降低由于铜线所要求的高密度材料所造成的电缆衰减。铜包铝线由于比铜线更为柔韧,所以容易满足安装要求,从而可减小在弯曲点和支架点由于内导体变位而引起的阻抗偏差。由于内导体拉出或扭曲而引起的电缆损坏也可明显减少,这是因为铜包铝线的热膨
Copper Clad Aluminum is a standard material for CATV industrial coaxial cable inner conductors. Because in this high-frequency application, the signal propagates on the surface of the conductor, copper clad aluminum wire can be used instead of copper wire, and because copper clad aluminum wire weighs only 37% of copper wire, this replacement can significantly reduce the wire The low cost and light weight also allows the use of low-density media, thereby reducing cable attenuation due to the high-density materials required for the copper wire. Copper coated aluminum wire is more flexible than copper wire, so it is easy to meet the installation requirements, which can reduce the impedance deviation caused by the displacement of the inner conductor at the bending point and the bracket. Cable damage due to pulling or twisting of the inner conductor can also be significantly reduced because of the thermal expansion of the copper clad aluminum wire