That is why cables have a plastic cylinder at the end
Many cables, for example laptop charging cables, have a plastic cylinder at the end. This is a so-called interference filter or jacket wave filter. In this article we explain what this filter is for and how it works.
Plastic cylinder at the end of the charging cable: the interference filter is used for this
- A device, such as a notebook, generates electromagnetic waves. These waves are passed on by the charging cable and released into the environment. The cable works very similar to a radio antenna.
- These so-called jacket waves interfere with other electronic devices or even the WLAN if it is radioed at the same frequency (wavelength).
- This is where the interference filter comes in: it picks up the electromagnetic waves before they can be amplified via the cable. You can read how this works in the next paragraph.
How does a jacket wave filter work?
- In the simplest case, a jacket wave filter consists of a ferrite core. Ferrite is a non-conductive or hardly electrically conductive material.
- The cable is guided through this ferrite core. The ferrite absorbs the electromagnetic waves and thus ensures interference suppression.
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On the next page we explain how a radio works.