Filter
Filter (1) a network, usually composed of inductors and capacitors (for lumped circuit), or transmission lines of varying length and characteristic impedance (for distributed circuit), that passes ac signals over a certain frequency range while blocking signals at other frequencies. A bandpass filter passes signals over a specified range (flow to fhi), and rejects frequencies outside this range. For example, for a dbs receiver that is to receive satellite transmitted microwave signals in a frequency range of 11 ghz to 12 ghz, a band-pass filter (bpf) would allow signals in this frequency range to pass through with minimum signal loss, while blocking all other frequencies. A low-pass filter (lpf) would allow signals to pass with minimum signal loss as long as their frequency was less than a certain “cutoff frequency” above which significant signal blocking occurs.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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