Coaxial cable is short, two-pin cable with concentric structure. They consist of an inner conductor, which is surrounded at a constant distance by a hollow cylindrical outer conductor. The space consists of an insulator. Most of the outer conductor is protected by an insulating, corrosion-resistant, waterproof jacket from the outside. Current coaxial cable having an outer diameter of 2 to 15 mm, special forms of Coaxial Cables can be of 1 to 100 mm diameter.
What makes a Coaxial Cable
Coaxial cable are flexible, their inner conductor usually have thin, braided or stranded copper wires and cable shields are made of braided copper wires too. Rigid coaxial cable for high performance are constructed with a rigid outer conductor in the form of a tube.
Special forms of coaxial cable has two or more inner conductors, coaxially arranged outer conductor, such as triaxial is available and are used mainly in the video technology. Many conventional coaxial cable uses braided copper wire forming the shield.
The insulating jacket are of varied materials. PVC to fire-resistant materials – different raw materials are used.
Technical details of Coaxial Cable
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Coaxial cable usually are adapted to transmit in the frequency range of several kHz to several GHz frequency signals. The frequency can be broadcast signals, radar signals or signals to be measured easily in a laboratory. Coaxial cable are used to transfer high-unbalanced signals. Coaxial cable usually has a defined line impedance. This is the reason for its usage in radio and television reception equipments, which typically has 75 ? line impedance.
Advantage of the coaxial cable
- Coaxial Cable prevents introduction of interferences into the cable. This makes Coaxial Cable suitable for household usage.
- The currents flowing in the coaxial cable has no to little magnetic interference.
- Handling is better when compared that with twisted cables.
- Standardized Cable Types are commercially available with specific impedance.
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