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(electronics) A point on the graph of some quantity in an antenna, network, or control system, versus frequency, distance, or some other variable at which the power is half that of a nearby point at which power is a maximum. half-power frequency
A frequency at which the power is 50% of maximum. This corresponds to 70.7% of maximum current or voltage.
The half power point of an electronic amplifier stage is that frequency at which the output power has dropped to half of its mid-band level.
This occurs when the output voltage has dropped by 3dB and the power has dropped by half. A bandpass amplifier will have 2 half power points, whilst a low pass amplifier will have only one. A high pass amplifier stage will have only the lower half power point.
The bandwidth of an amplifier is usually defined as the difference between the lower and upper half power points. This is therefore also known as the −3 dB bandwidth.
The half power point or 3dB point of an antenna beam is the angle off boresight at which the antenna gain has fallen 3dB below the peak.
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Electronics Dictionary. Copyright 2001 by Twysted Pair. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Half power point". Read more |
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