Depending upon the application, many different types of conductor constructions may be found in coaxial cables.
Copper-Covered Steel Conductors
In some applications strength is a key requirement. Steel conductors covered with copper may be needed to prevent breakage in an active environment. Copper covered steel conductors provide added strength and RF support and are often used in CATV and MATV applications.
Popular Dielectric Materials include:
PE-Solid Polyethylene: good for low temperature applications.
FPE-Foamed Polyethylene: provides lower attenuation and capacitance than solid PE.
Air Spaced: supports a lower dielectric constant than Polyethylene while allowing for a small diameter cable size.
FEP-Fluorinated Ethylene Propylene: excellent for high temperature and plenum applications. Low dielectric constant for clear signal transmission.
FFEP-Foamed Fluorinated Ethylene Propylene: extremely low dielectric constant.
In coaxial applications, shielding is an important part of the overall composition of the cable. Shielding not only protects the loss of signal in high frequency application, but also helps to prevent EMI (electromagnetic interference) and RFI (radio frequency interference) in the circuit. There are three popular types of shielding available from Coleman/CCI: overall foil, braid and foil/braid.
Dual Shield Coax Cable
Construction consists of a foil-braid-foil-shield.
Construction consists of a foil-braid-foil-braid shield. Very popular for CATV and MATV applications in high EMI/RFI locations such as urban areas.
Quad Shield Coax Cable
The outer sheath found on most coaxial cables is called the jacket. The main function of the jacket is for protection from the environment and mechanical damage as well as an additional form of insulation. The compounds used to make the jacket may have different temperature ratings. The temperature rating of a cable, along with the location rating (i.e. plenum, wet, sunlight resistant etc.) will determine the minimum or maximum operating temperature of the cable. In today’s multi-application world, many jacketing choices exist:
Dual Quad Shield Coax Cable
Coax W/18-2 Power Conductors