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Definition of "filter" |
A circuit that is designed to pass signals with desired frequencies and reject or attenuate other frequencies. / A filter to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil. / (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. Abandpass 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. |
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