Cylindrical interference effect of magnetic ring magnetic core, motherboard, CPU in the computer chassis, power supplies, and IDE cables are working in high frequency mode, there is plenty of space in the chassis are therefore spurious electromagnetic interfering signal, signal strength is also outside of the chassis number to dozens of times! Absorption magnetic ring, and said ferrite magnetic ring, often for can demolition of separation type magnetic ring, it is electronic circuit in the common of anti-interference components, for high frequency noise has is good of inhibition, General using ferrite material (Mn-Zn) made. magnetic ring in different of frequency Xia has different of impedance characteristics, General in low frequency Shi impedance is small, dang signal frequency increased magnetic ring performance of impedance sharply increased. makes normal useful of signal is good of through, and can is good of inhibit high frequency interference signal of through, and cost low.