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How coaxial cable works

Time:2019-01-17

The most common coaxial cable consists of a copper conductor separated by an insulating material. The outside of the inner insulation is another layer of a ring conductor and an insulator. All the cables are then covered by a sheath of polyvinyl chloride or Teflon.


The coaxial cable is divided into four layers from the inside to the outside: a central copper wire (single-stranded solid wire or multiple stranded wires), a plastic insulator, a mesh-shaped conductive layer and a wire sheath. The central copper wire and the mesh conductive layer create a current loop. It is named because the central copper wire and the mesh conductive layer are coaxial.

Coaxial cable transmits AC instead of DC, in other words, there are several times of current reversal per second.

If a typical household wire is used to deliver a high frequency current, such a wire would be equivalent to an antenna that emits radio to the outside. This effect depletes the power of the signal and therefore the received signal strength is reduced.

The coaxial cable is designed to completely solve this problem. The radio emitted by the center wire is isolated by the mesh conductive layer, and the mesh conductive layer can control the transmitted radio according to the grounding method.

Coaxial cable also has a problem, that is, if a certain section of the cable produces a large extrusion or distortion, the distance between the center wire and the mesh conductive layer is not consistent, which leads to Internal radio waves are reflected back to the signal source. This type of effect reduces the signal power that can be received. In order to overcome this problem, a layer of plastic insulator is added between the center wire and the mesh conductive layer to ensure that they are consistent with each other. This also leads to the fact that such cables are stiff and not flexible.


Shenzhen Tiankele Communication Technology Co., Ltd. is a national high-tech enterprise focusing on coaxial cable for 12 years. All products use raw materials that meet ROSH requirements, and 90% of suppliers have cooperated for more than 10 years. It has 5 global top 500 companies, 25 Chinese top 100 companies and 160 global customers, with an annual growth rate of 35%. 12 years experience R & D team, professional performance simulation software HFSS, 3D software PROE, graphics software CAD design. With 12 years of industry experience, we provide thousands of RF solutions to our customers. Choosing Tiankele is the solution to choose a quality RF connection.

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