![]() Conversely, electric and magnetic fields outside the cable are largely kept from causing interference to signals inside the cable. The advantage of coaxial design is that the electric and magnetic fields are confined to the dielectric with little leakage outside the shield. Normally, the shield is kept at ground potential and a voltage is applied to the center conductor to carry electrical signals. Coaxial cable also provides protection of the signal from external electromagnetic interference.Ĭoaxial cable differs from other shielded cable used for carrying lower frequency signals, such as audio 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 radio frequency transmission line.Ĭoaxial cable conducts electrical signal using an inner conductor (usually a flexible solid or stranded copper wire) surrounded by an insulating layer and all enclosed by a shield layer, typically a woven metallic braid the cable is often protected by an outer insulating jacket. ![]() This allows coaxial cable runs to be installed next to metal objects such as gutters without the power losses that occur in other types of transmission lines. One advantage of coax over other types of radio transmission line is that in an ideal coaxial cable the electromagnetic field carrying the signal exists only in the space between the inner and outer conductors. Its applications include feedlines connecting radio transmitters and receivers with their antennas, computer network ( Internet) connections, and distributing cable television signals. Ĭoaxial cable is used as a transmission line for radio frequency signals. ![]() ![]() Coaxial cable was invented by English engineer and mathematician Oliver Heaviside, who patented the design in 1880. The term coaxial comes from the inner conductor and the outer shield sharing the same geometric axis. RG-59 flexible coaxial cable composed of:Ĭoaxial cable, or coax, has an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by a tubular conducting shield. ![]()
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