Coaxial Cable Shielding Performance

Coaxial cable shielding performance indicates the ability to prevent external noise intrusion and signal leakage, and is expressed in dB. Shielding performance varies greatly depending on the composition of the outer conductor, so the composition and characteristics are shown below.
·Braided Shield / Flexible Cable
Braided shielding consists of metal wires woven into a flexible structure, but due to its mesh pattern, its shielding performance is somewhat inferior in the high-frequency range. Shielding performance is generally around 40-80 dB.
·Braided Shield + Plated / Semi-Flexible Cable
By applying tin plating to the braid, the electrical connection of the braid is stabilized, improving shielding performance. This achieves shielding performance of approximately 60-100 dB.
·Foil + Braid Shield / Millimeter-Wave Compatible Flexible Cable
This structure combines aluminum foil or copper foil tape with braiding. Shielding performance is improved in the high-frequency range, achieving 90-110 dB of shielding performance.
·Metal Tube Shield (Tube Shield)/Semi-Rigid Cable
Using a seamless metal tube as the outer conductor results in extremely high shielding performance. Shielding performance reaches 120-140 dB, significantly outperforming other configurations. However, it lacks flexibility and is provided in the desired dimensions after being bent using specialized processing equipment.
The external conductor configuration must be appropriately selected based on the usage environment and required signal quality. For example, in environments with high levels of RF noise, “tape + braided” or “metal tube” configurations are recommended. On the other hand, “braided” is suitable when flexibility is required.