What is a ferrite? [Ferrites
For Cell Phone Headset Wire Suppression]
Ferrites are a chemical
composition of various metallic oxides, e.g., nonmetals. The word, ferrite,
derives from the Latin, "ferrum," meaning iron, and iron oxide is
the major constituent in all ferrites. The history
of using ferrites dates back thousands of years,
Ferrites derive their usefulness from a combination of
two principal characteristics:
- High magnetic permeability which concentrates and
reinforces the magnetic field
- High electrical resistivity, which limits the amount of
flow of electrical current in the ferrite. This is in contrast to some
metals, such as iron, which, although they possess ferromagnetic
characteristics similar to ferrites, are highly conductive, permitting large
amounts of current to flow in the metal core.
The flow of electrical energy in the core, known as
"eddy" current, runs counter to the desired flow and is converted
into heat, resulting in overheating and lowered efficiency of the
component.
Ferrites, because of their unique combination of the two
above-described characteristics, enjoy low energy losses, are highly
efficient, and function at high frequencies. (approximately 1 kHz to 2GHz)
These characteristics make the manufacture of miniaturized high frequency
electronic components more practical an easy to control EMI interference.
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