An insulator surrounds an inner conductor, which is generally circular. It is also surrounded by an outer conductor and finally covered by a sheath (vinyl/protective coating). It is called a "coaxial cable" because the cross section of the cable looks like nested cylinders with the same axis. Although it is a common raw material, the insulator is polyethylene. The outer conductor is often made of thin copper wires called braided wire, but there are also ones that use metal foil such as copper foil or aluminum foil. The purpose of this is to increase the shielding rate in high frequency bands for precision measurements and use at frequencies higher than ultrahigh frequency waves.
■Advantages of using
Coaxial cables can efficiently transmit high-frequency signals and minimize the effects of external radio waves and noise, so they are used in various applications such as broadcasting stations, relay stations, factories, and from audio and video signals to microwave signal transmission. It is used in different places and purposes.
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