The transmission rate of high-speed PCB design wiring systems is constantly accelerating with the passage of time, but this also brings a new challenge - the anti-interference ability is becoming weaker and weaker. All of this stems from the fact that the higher the frequency of information transmission, the more sensitive the signal, and the weaker the energy, making the wiring system increasingly susceptible to interference. In some common electronic devices, such as computer screens, mobile phones, motors, radio broadcasting equipment, etc., cables and devices can interfere with other components or be severely interfered by other interference sources. Today, let me introduce a shielding method in high-frequency PCB design to you, let's take a look together!

Especially when using high-speed data networks, the time required to intercept a large amount of information is significantly lower than the time required to intercept low-speed data transmission. The twisted pair in data twisted pair can resist external interference and inter pair crosstalk through its own twisting at low frequencies. However, at high frequencies (especially when the frequency exceeds 250MHz), only twisting and merging cannot achieve the purpose of anti-interference, and only shielding can resist external interference.

The function of the cable shielding layer is similar to that of the Faraday shielding layer. The interference signal enters the shielding layer, but does not enter the conductor. Therefore, data transmission can operate without faults. Due to the lower radiation emissions of shielded cables compared to unshielded cables, network transmission is blocked. Shielding networks (shielded cables and components) can significantly reduce the radiation level of electromagnetic energy that may be intercepted when entering the surrounding environment.