Understanding the Structure of a Coaxial Cable
Coaxial cables are widely used across various industries; they ensure reliable signal transmission while maintaining stable signal quality, controlled impedance, low attenuation, and effective shielding performance. Join the SkywardTelecom team to learn about the composition of coaxial cables.
What Is a Coaxial Cable?
Unlike ordinary power cords or Ethernet cables, coaxial cables are specifically designed for transmitting high-frequency electrical signals while controlling electromagnetic interference and signal loss. They are an important transmission path for radio frequency, wireless communication, broadcasting, surveillance, and other high-frequency applications. A typical coaxial cable includes four main components:
Center Conductor
The center conductor of a coaxial cable is the core component for transmitting electrical signals. Commonly used materials include bare copper, copper-clad steel (CCS), stranded copper wire, and tinned copper wire. Among these, copper conductors have excellent conductivity and flexibility, and are widely used in communication applications.
Dielectric Insulation
The dielectric insulation layer separates the central conductor from the shielding layer, playing a crucial role in the characteristic impedance of the coaxial cable, preventing signal attenuation, and ensuring transmission speed. Commonly used dielectric materials include polyethylene (PE), polytetrafluoroethylene (PTFE), and foamed polyethylene (Foam PE).
Shielding Layer
The shielding layer is a critical component of coaxial cables, serving to reduce electromagnetic interference (EMI), prevent signal leakage, and maintain signal integrity. Different shielding structures, including aluminum foil, copper braided layers, double/triple shielding, and corrugated metal shielding, provide different levels of protection.
Outer Jacket
The outer sheath is the protective layer of the coaxial cable, which can resist mechanical damage caused by the external environment. Commonly used materials include polyvinyl chloride (PVC), polyethylene (PE), low smoke halogen-free (LSZH), and fluorinated vinyl (FEP). Each material has different properties and can withstand harsh conditions such as ultraviolet radiation, humidity, and high temperature, thereby ensuring the long-term reliability of the cable.
Common Applications of Coaxial Cables
Coaxial cables are widely used for reliable signal transmission across various industries. They are commonly found in RF communication, wireless networks, cellular base stations, antenna systems, CCTV, and broadcasting, where stable signal quality, controlled impedance, low attenuation, and effective shielding are important for maintaining reliable system performance.