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In Electronics , cutoff frequency (''f''c) is the Frequency either above which or below which the power Output of a Circuit , such as a Line , amplifier, or Filter , is reduced to 1/2 of the Passband power; the '''half-power point'''. This is equivalent to a voltage (or Amplitude ) reduction to 70.7% of the passband, because Voltage ''V''2 is proportional to Power ''P''. This happens to be close to −3 Decibel s, and the cutoff frequency is frequently referred to as the '''−3 dB point'''. Also called the '''knee frequency''', due to a Frequency Response curve's physical appearance. A Bandpass circuit has two cutoff frequencies and their Geometric Mean is the Center Frequency . The term cutoff frequency can also mean the frequency below which a Radio Wave fails to penetrate a Layer of the Ionosphere at the incidence angle required for Transmission between two specified points by Reflection from the layer. In Physics , the term cutoff frequency will often refer to the Plasma Frequency , or can refer to some concepts related to Renormalization in Quantum Field Theory . SEE ALSO EXTERNAL LINKS
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