Radio frequency
Radio Frequency
Radio frequency (RF) is a rate of oscillation in the range of about 20 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals. RF usually refers to electrical rather than mechanical oscillations, although mechanical RF systems do exist.
Pronunciation
Radio Frequency: /ˈreɪdi.oʊ ˈfriːkwənsi/
Etymology
The term "radio frequency" and its abbreviation "RF" are derived from the radio wave phenomenon, which was first theorized by James Clerk Maxwell and later observed and studied by Heinrich Hertz. The term frequency refers to the number of oscillations or cycles per unit of time.
Related Terms
- Electromagnetic spectrum: The range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
- Radio wave: A type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
- Alternating current: An electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.
- Oscillation: A repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.
See Also
External links
- Medical encyclopedia article on Radio frequency
- Wikipedia's article - Radio frequency
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