The coaxial cable is used as a transmission pipe for radio frequency signals. One of the advantages of using a coaxial cable compared to other types of radio transmission lines is that in the case of an ideal coaxial cable, the electromagnetic field carrying the signal exists only in the space between the internal and external wires.
Thanks to this feature, the coaxial cable can be used next to metal objects without power losses occurring in other types of transmission solutions. What's more, the coaxial cable ensures protection of the signal against external electromagnetic interference.
Thanks to its construction, coaxial cables are more resistant to interference in relation to symmetrical cables. They are used to transmit sinusoidal and digital signals in the range of 20 Hz - 15 GHz.