1, Coaxial cable is a guide system composed of two coaxial cylindrical conductors, a wide band microwave transmission line filled with air or high frequency medium between the inner and outer conductors;
2, the structure is composed of four parts from outside to inside: sheath, outer conductor layer, insulating medium layer and inner conductor, according to the application location, can be roughly divided into trunk cable, branch cable and user distribution network cable three types;
3, mainly in the form of TEM mode is widely used in the design of broadband feeders and components, when the transmission signal wave is longer than the length of the transmission line, the size and phase of the current at each point on the transmission line can be approximately the same, there is no need to consider the distribution parameter effect, but when the wavelength of the transmission signal and the length of the transmission line can be compared with each other, the distribution parameter effect appears.
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