Electronic Filter
1. An electronic filter is a circuit that passes certain frequencies and rejects other frequencies.
2. Electronic filters are four-terminal devices that serve to transfer electrical current between the source and load in a certain frequency range.
Electronic filters are used in radio applications and consist of capacitors, inductances and sometimes resistors. In high frequency applications the active part of the inductances and capacitances is usually neglected. The principal of filter construction is depicted on the figures below.
There is a term that exists called k-filters. These filters consist of a combination of the repeating section of filter units (depicted on the figures above), and as shown on further figure below. The load resistance should be matched to the filter resistance. The electrical filters are characterised with better quality if their attenuation is large in the attenuation frequency range.
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