Ferrite beads are used as a passive low pass filter by converting rf energy to heat by design contrast this with inductors which by design minimize conversion of rf energy to heat offering a high impedance to rf.
Ferrite cable clamp filter.
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The geometry and electromagnetic properties of coiled wire over the ferrite bead result in an impedance for high frequency signals attenuating high frequency emi rfi.
Ferrite rings are a convenient way for a large cable to achieve multiple turns and high exposure to the ferrite material.
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Initial test results of ferrite rings showed poor performance compared to clamps when a single wire was passed through a ring.
As in the case of the previous test after winding the exclusive cable twice around the clamp filter noise was relatively reduced by 5 to 10 db.
Unfortunately ferrite beads also called a ferrite choke ferrite clamp ferrite collar emi filter bead or even a ferrite ring filter can be a bit of a mystery.
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This does not mean that ferrite rings are a poor choice.
Before mounting the clamp filter noise was emitted at a broad frequency band from 100 to 600 mhz.
0730 clamp filter connected to the power cable.
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The ferrite core function resembles that of an inductor but the ferrite frequency response deviates from this functionality at high frequencies.
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The measurement results are shown in figure 4.
Mouser offers inventory pricing datasheets for ferrite clamp on cores.
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