Coaxial cable<span>, or </span>coax<span> (pronounced </span><span>/<span>ˈkoʊ.æks</span>/</span><span>), is a type of </span>cable<span> that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. Many coaxial cables also have an insulating outer sheath or jacket. The term </span>coaxial<span> comes from the inner conductor and the outer shield sharing a geometric axis. Coaxial cable was invented by English engineer and mathematician </span>Oliver Heaviside, who patented the design in 1880.[1]<span> Coaxial cable differs from other </span>shielded cable<span> used for carrying lower-frequency signals, in that the dimensions of the cable are controlled to give a precise, constant conductor spacing, which is needed for it to function efficiently as a </span>transmission line<span>.</span>
