Introduction to Understanding Coaxial Cables

Coaxial cable from the use of points can be divided into baseband coaxial cable and broadband coaxial cable (ie network coaxial cable and video coaxial cable). Coaxial cable sub-50Ω and 75Ω broadband cable two types of cables. 

Baseband cable is divided into fine coaxial cable and coarse coaxial cable. 

Baseband cables are used for digital transmission only, with data rates up to 10Mbps.

Coaxial Cable refers to a cable that has two concentric conductors and the conductors and shield share the same axis. 

The most common coaxial cable consists of a copper conductor isolated from an insulating material. 

The outer conductor of the inner insulation is another layer of loop conductor and its insulator. The entire cable is then covered by a jacket of PVC or Teflon They usually cable PVC power cable and THHN cable.

Coaxial cable is a kind of wire and signal transmission line, usually caused by four layers of material.

The innermost is a conductive copper wire.

The wire is surrounded by a layer of plastic (for insulator, dielectric use).

The outside of the insulator A thin layer of mesh conductor (usually copper or alloy), and then the outer conductor is the outermost insulation material as the skin.

According to the different insulating medium, Inside and outside the conductor are mainly divided into:

Foam insulated cables: 

Insulators of foam insulated cables are made of physically foamed polyethylene.

Foam insulated cables are generally used in telecommunications.

Air-insulated cables: Air-insulated means that the insulating medium between the inner and outer conductors is air, and the inner conductor is supported by an insulating solid medium between the outer conductor and the outer conductor. 

Air-insulated cables are generally used for various high-power RF transmission.

According to the outer conductor shape, coaxial cable is divided into:

Corrugated coaxial cable. In general, corrugated cables have better flexibility and reliability, bending radius performance is better than the straight wall. Therefore, the industry are mainly used bellows outer conductor coaxial cable.

Straight wall coaxial cable.

According to the different outer conductor material, the current transmission cable is divided into two major types of copper feeder and aluminum feeder. Aluminum cables have relatively good cost advantages because of their relatively small price fluctuations due to their huge price fluctuations relative to international copper products. 

As the inner conductor of aluminum cable still uses copper as the propagation medium, its electrical performance is comparable to copper outer conductor cable, and operators are slowly accepting this new feeder type.