You’ve probably noticed it before: the small plastic cylinder that can be found on most laptop charging cables. It is a so-called interference filter. You can find out what function it fulfills here.
Chargers for computers are now available in a wide variety of designs and with a wide variety of functions. Many charging cables have a small plastic cylinder, the so-called interference filter or standing wave filter.
The purpose of the filter is to ensure that the functionality of other electronic devices is not impaired. This is because devices such as a laptop generate electromagnetic waves when they are started up. These are in turn forwarded by the charging cable and released to the environment. This can interfere with other technical devices due to the so-called standing waves. Among other things, this can also interfere with the WLAN if it transmits on the same wavelength or on the same frequency.
The small cylinder on the PC charging cable: noise filter absorbs electromagnetic waves
The function of the noise filter is to prevent electromagnetic waves from spreading. With a ferrite core built into it, it ensures that the electromagnetic waves are canceled, because ferrite is a material that is not or hardly electrically conductive. The charging cable runs through the ferrite core, thus absorbing the electromagnetic waves and thus ensuring interference suppression.
If you have the impression that the WiFi speed leaves a lot to be desired in your own four walls or you have general problems in your home network, you should carry out a network analysis.