The role, type of the shielding layer in cable
Shielded cable is a cable used to transmit signals. It has shielding properties and is used to prevent external electromagnetic interference from affecting its transmission effect. It usually has a conductive shielding layer to isolate or absorb the radiation of external electromagnetic fields.
1. Metal shielding
Metal shielding is a shielding method mainly used for high-frequency signal transmission. It usually includes two forms: copper foil shielding and copper mesh shielding. Copper foil shielding is to wrap copper foil around the insulator and core wire to form a shielding layer around the entire wire. Copper mesh shielding is to weave copper wire into a mesh and put it on the outer layer of the wire. Its shielding performance is slightly inferior to copper foil shielding.
2. Aluminum-plastic composite shielding
Aluminum-plastic composite shielding refers to the inner core wire covered with a layer of aluminum-plastic composite material, the outer layer is aluminum foil, and the inner layer is plastic film. Aluminum-plastic composite shielding can achieve a good shielding effect, and has the good electrical properties of the outer layer of aluminum foil and the protective effect of the inner layer of plastic film, especially suitable for low-frequency signal transmission.
3. Copper tape shielding
Copper tape shielding is to wrap a layer of copper tape around the outside of the core wire, which can achieve shielding of external electromagnetic fields through grounding. Copper tape shielding has a better shielding effect and is suitable for occasions where both high-frequency and low-frequency signals are transmitted.
In short, the application range of shielded cables is becoming more and more extensive. Its different shielding methods are suitable for different transmission frequencies and occasions. Users need to choose cables according to their specific application requirements.
Different shield has different functions. Please choose as per your own situation.