In telecommunications, the term cutoff frequency (fc) has the following meanings:
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 V2 is proportional to low frequency cutoff for helix antennas power P. This happens to be close to −3 decibels, and the rl cutoff frequency cutoff cutoff frequency frequency is frequently referred matlab fspecial rectangular filter cutoff frequency to as the −3 dB point. cutoff frequency of low pass filter 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 waveguide cutoff frequency 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.
See also
- Low-pass filter
- High-pass filter
- Time constant
- Angular frequency
External links
- Calculation of the center frequency with geometric mean and comparison to the arithmetic mean solution
- Conversion of cutoff frequency fc and time constant τ
Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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