Electromagnetic Shielding and Grounding of Camera Modules in Smartphones 

Application Background 

In the design of smartphones, camera modules are vulnerable to internal high-frequency signals (such as 5G RF) or external electromagnetic interference (EMI), which can lead to imaging noise or signal distortion. Single-sided black conductive fabric, with its excellent conductivity, flexibility and light-blocking properties, has become one of the solutions. 

Specific implementation steps 

Material selection 

The plain single-sided black conductive fabric is made of polyester fibers coated with copper/nickel. The black side is the conductive layer, while the other side is the insulating layer. 

Features: 

Surface resistance ≤ 0.1Ω/sq (conductive in XYZ three directions) 

Thickness: 0.05 - 0.1mm, suitable for narrow spaces. 

The black coating has both light-blocking properties and reduces stray light interference. 

Installation method 

Shielding the package: With the black conductive side of the conductive fabric facing inward, tightly wrap the metal casing of the camera module. Secure the edges with conductive tape to form a Faraday cage effect, shielding against external electromagnetic waves. 

Grounding treatment: Connect the conductive fabric to the grounding terminal of the mainboard with conductive tape to ensure the ESD discharge path. 

Effect Verification 

EMI test: In the frequency band of 1 GHz to 6 GHz, the shielding effectiveness is ≥ 60 dB (refer to 3M laboratory data). 

Imaging test: Compared with the unshielded module, the noise is reduced by more than 30% (actual case from Transsion mobile phone design). 

Advantage Analysis 

Lightweight: Compared with metal shielding covers, the weight is reduced by 50%. 

Flexible adaptation: Can fit curved surface structures (such as the irregular space around the lens). 

Cost-effectiveness: Domestic alternative solutions can reduce costs by 20%. 

Extended Applications 

Similar solutions can also be applied to: 

Grounding of flexible display screens (such as FPC line shielding in foldable screen mobile phones) 

Automotive radar sensor (anti-signal interference) 

wearable devices (such as smartwatches)