filter

circuit filter (filter circuit) is a series that is designed only to allow a certain frequency range has a value of damping (attenuation) is small (referred to as the 'Pass Bands'), while in other frequency ranges have a very large damping values ​​(referred to as 'Attenuation Band' or 'Stop Bands').
A filter circuit can consist only of passive components and is commonly referred to as a passive filter circuit (Passive Filter Network). There is also a series of filters that use active components and commonly referred to as a series active filter (Filter Active Network). In this article will only discuss a series of passive filters only, while the active filter circuit will be discussed in a separate article.

For the purposes of filters that do not require a narrow bandwidth (not to SSB filter), use ceramic filter. Ceramic filters used in radio for the IF filter.
Ceramic filter is actually also have the ability as an oscillator or SSB filter, but the author does not recommend to use it as a SSB filter therefore a very wide bandwidth, far exceeding the permitted bandwidth in radio regulation.

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