"Coaxial", as it literally means-the center conductor and outer conductor are located on the same centerline in structure, or "Axis". In the entire coaxial line, the electrical pulse signal is propagated between the center conductor and the outer conductor. It is mainly composed of the following four parts:
The main signal path. Single strand or multiple strands can be used.
One of two conductors on the same axis. Usually braided layer or braided layer plus aluminum foil. The following are the types and performance of the shielding layer:
Shielding effectiveness refers to the corresponding resistance of the shielding layer to various interference signals. In the coaxial line, the external conductor plays two roles in the shielding function at the same time: one is to prevent the intrusion of external interference signals, and the other is to prevent the leakage of internal signals and interfere with nearby equipment. The shielding effectiveness is measured in dB. The higher the value, the stronger the shielding ability. The table lists the corresponding shielding effectiveness of different types of shielding layers.
As the table shows, the shielding effectiveness increases as the density of the shielding layer increases. The strongest shielding effect is the rigid (formable) coaxial cable. Because it uses a solid sleeve as the outer sheath, the quality of the connector and the cable joint becomes the only factor that affects its shielding ability.
The insulating material isolates the shielding layer from the center conductor. At the same time give the cable impedance characteristics.
Insulate the shield from the center conductor and protect the cable. Usually PVC extrusion molding.