The Shielding Cover is an electronic component primarily used to reduce electromagnetic interference (EMI) and protect internal circuits. It achieves this by shielding internal circuits from external electromagnetic waves and preventing internally generated electromagnetic waves from radiating outward, thereby ensuring the normal operation and stability of electronic devices. The functions and importance of the shielding cover are reflected in the following aspects:

Shielding electromagnetic interference: The shielding cover effectively isolates electromagnetic fields, preventing external electromagnetic interference from entering internal circuits, while also stopping electromagnetic radiation generated by internal circuits from leaking into the external environment. This is crucial for protecting electronic devices from external interference and minimizing their impact on surrounding devices.

Heat dissipation: Typically made of metal, the shielding cover has excellent thermal conductivity, allowing it to dissipate heat from inside the device to the external environment. This helps maintain the device's normal operating temperature, preventing performance degradation or damage caused by overheating.

Increasing structural strength: The shielding cover can also enhance the structural strength of the motherboard, preventing damage from external pressure or impact.

Improving electromagnetic compatibility: By using a shielding cover, the electromagnetic radiation emitted by electronic devices can be reduced, improving electromagnetic compatibility and ensuring compliance with electromagnetic compatibility standards.

Preventing collision of components: During the manufacturing process of electronic devices, the shielding cover can prevent adjacent circuit boards or Other components from colliding during transportation or testing.

The working principle of the shielding cover is based on the Faraday cage principle, which states that a closed metal container can block external electromagnetic fields from entering and internal electromagnetic fields from leaking. Shielding covers are typically made of conductive materials such as ‌copper, ‌aluminum, or ‌iron, which possess excellent conductivity and shielding effectiveness. When properly installed and grounded, the shielding cover forms an electrostatic shield, effectively blocking external electromagnetic interference from entering internal circuits and preventing internal electromagnetic radiation from leaking into the external environment.