Half-power point

The half-power point is the point at which the output power has dropped to half of its peak value; that is, at a level of approximately -3 dB.[1][a]

In filters, optical filters, and electronic amplifiers,[2] the half-power point is also known as half-power bandwidth and is a commonly used definition for the cutoff frequency.

In the characterization of antennas the half-power point is also known as half-power beamwidth and relates to measurement position as an angle and describes directionality.

  1. ^ "Power bandwidth - MATLAB powerbw". uk.mathworks.com. Retrieved 5 August 2017.
  2. ^ Schlessinger, Monroe (1995). Infrared technology fundamentals (2nd ed., rev. and expanded. ed.). New York: M. Dekker. ISBN 0824792599.


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