An RF cable refers to a cable that carries radio frequencies to an electrical device. There are many types of cables designed for all sorts of devices. Cables gather their characteristic impedance from the relation of the outer conductor diameter to the inner conductor diameter, and also through the insulation's dielectric constant. A Coaxial RF connector is an electrical connector designed to work at radio frequencies in the multi-megahertz range. RF connectors are typically used with coaxial cables and are designed to maintain the shielding that the coaxial design offers.