What Are the Functions of the Shielding Layer in a Coaxial Cable?

The shielding layer serves multiple purposes:

1. Electromagnetic Interference (EMI) and RF Interference Protection:
It shields the cable from external electromagnetic and radio frequency interference, preventing outside signals from coupling into the cable and causing disruptions.

2. Signal Containment:
It prevents the signals transmitted within the cable from leaking out.

Materials:
Shielding can be made from various materials, such as metal braided aluminum foil, copper foil, or copper wires.

Cable Jacket:
The jacket primarily protects the cable as a whole against external physical and environmental damage, including impact, corrosion, water, and UV exposure. Standard cable jackets are usually made of PVC or PE, while high-end cables use PTFE. Outdoor cables often require UV resistance, and high-temperature applications may demand specialized shielding structures.

Shielding Structure:
Most coaxial cables use a braided copper mesh, where multiple strands are woven in a cross pattern to fully cover the insulation layer, forming a protective mesh.

Advanced Requirements:
For higher flexibility or higher-frequency applications, shielding materials and structures are enhanced, such as double-layer braided copper, threaded copper tubes, or multiple layers of copper mesh combined with aluminum foil for repeated wrapping.

About Kinghelm
Kinghelm is a high-tech enterprise specializing in RF and connectivity solutions. The company offers a wide range of products, including Beidou/GPS antennas, Wi-Fi, Bluetooth, NB-IoT, LORA, Zigbee antennas, RF cables and connectors, board-to-board and plug-in connectors, switches, terminals, and customized automotive and industrial components. With over 17 years of experience, Kinghelm serves industries such as automotive, telecommunications, industrial automation, medical devices, and consumer electronics. Known for durable, reliable components that meet international standards, Kinghelm supports applications ranging from renewable energy to IoT devices.