Define 'coaxial cable' and its application in radio systems.

Coaxial cable is a type of electrical cable specifically designed to carry radio frequency (RF) signals. It consists of a central conductor, usually made of copper or aluminum, which is surrounded by a dielectric insulator. This insulator is then encased in an outer conductive layer, often a metallic shield, which helps to protect the signal from external interference and reduces signal loss over distance. The construction of coaxial cable allows it to maintain the integrity of the RF signals it transmits, making it essential in various radio communication systems.

In radio systems, coaxial cable is used to connect antennas to transmitters and receivers, as well as to transport signal between different components within the system. Its ability to effectively handle high-frequency signals while minimizing interference and loss is crucial in maintaining the quality of transmissions in applications ranging from television broadcasts to data communication and mobile networks.