With SMD components are continuously miniaturized and the component integration of PCB is continuously improved, the requirements for the isolation of each other between different regions of the product are also higher.

This integration in the when the product has a radio communication system, the performance of more intense, because both digital and analog devices are very sensitive flagship, and itself, the existence of the antenna and a variety of high sensitivity, in such proximity switch mode converter and DSP circuit when the larger influence on the antenna

And mobile phones in recent years is widely used in wireless communications, including bluetooth, IEEE802.11, FM, such as all kinds of wireless data communication, but gradually the built-in antenna, so using PCB shield in the level of technology is inevitable.