Magnetic rings are commonly used anti-interference components in electronic circuits, which have a good suppression effect on high-frequency noise. They are generally made of ferrite materials (Mn Zn). The magnetic ring has different impedance characteristics at different frequencies, and the resistance is generally very small at low frequencies. When the signal frequency increases, the impedance of the magnetic ring increases sharply. As we all know, the higher the frequency of a signal, the easier it is to radiate out. Generally, signal lines do not have a shielding layer, so these signal lines become good antennas to receive various chaotic high-frequency signals in the surrounding environment. These signals are superimposed on the originally transmitted signals, and even change the useful signals that were originally transmitted. So under the action of the magnetic ring, normal and useful signals can pass well, and high-frequency interference signals can be effectively suppressed, and the cost is low. So it's not surprising that you can see plastic lump-shaped integrated magnetic rings on display signal cables, USB connection cables, and even high-end keyboards and mice.

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