It is a data transmission cable that consists of two conductors.It is used for the transmission of high frequency electrical signals.The structure of the coaxial cable consists of a copper wire that is wrapped by an insulating element, pieces of braided metal (to absorb noise and protect information) and an outer cover made of plastic, Teflon or rubber.
The coaxial cable is designed to carry high frequency signals. The most widespread use is cable television, radio stations, closed television (CCTV), home video equipment, broadband, Ethernet applications and submarine wiring systems.
Coaxial cable structure
The coaxial cable consists of a structure with four layers separated from each other .
- Center of the cable : we can find a thin conductor of wire;
- around this conductor: Layer of a plastic insulating material;
- At the end of this layer of insulation: Wire mesh as if it were another conductor.
- Rubber coverage: Last insulation to protect people.
Parts of the coaxial cable
- A protective cover made of plastic or thermoplastic elastomer .
- The copper mesh or the armored conductor with an aluminum braid that is covered with cobra.
- An insulator or dielectric foam.
- The central conductor or the copper core, that is, copper-coated steel.
Types of coaxial cable
Most coaxial cable impedances operate between 50 ohms and 75 ohms.
- 50 ohms – They use almost the total of the radio transmitters. Its pairing is optical with the antenna of the transmitter and they handle in a very simple way a high energy.
- 60 ohms – For Europe, the 60 ohm coaxial cable was the most usual for radio systems during the 50s.
- 75 ohms – It is a global standard impedance and was developed for the optimization of interurban cable design.
- 93 ohms – It’s an impedance that is currently no longer used.
Coaxial cable applications
The coaxial cable is widely used to transmit audio signals and visual signals . That’s why most televisions have the input for coaxial cable.
- Between an antenna and the television.
- In urban internet and cable television networks.
- Between an emitter and the broadcast antenna.
- In a data transmission network such as Ethernet can be like old versions.
- In interurban telephone networks.
- On submarine cables.
- In a video signal distribution line.