What Is The Basic Definition Of Coaxial Cable?

The coaxial cable is a guiding system composed of two coaxial cylindrical conductors, a broadband microwave transmission line filled with air or high-frequency medium between the inner and outer conductors.

The basic principle of the coaxial line: the coaxial cable is a shielded and non-dispersive structure, and the main mode of the guided wave in the coaxial cable is the TEM wave, but it can also transmit TE mode and TM mode at the same time, and its cut-off frequency is zero , The corresponding cut-off wavelength tends to infinity. It is a two-conductor transmission line composed of two coaxial inner and outer conductors and a dielectric in the middle. Generally, the outer conductor of the coaxial line is grounded, and the electromagnetic field is confined between the inner and outer conductors, so the coaxial line basically has no radiation loss and is almost free from external signal interference. Its working frequency band is wider than the two-wire transmission line, and it can be used in the band larger than the centimeter wave.

The structural characteristics of the coaxial cable: The structure of the coaxial line is composed of four parts, namely the sheath, the outer conductor layer, the insulating medium layer and the inner conductor from the outside to the inside.