Electromagnetic frequencies ranging from 3 kHz to 300 GHz
This article is about the generic oscillation. For the radiation, see radio wave. For the spectrum, see radio spectrum. For the electronics, see radio-frequency engineering.
"RF" redirects here. For other uses, see RF (disambiguation).
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency[1] range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies, and also encompasses the microwave range, though other definitions treat microwaves as a separate band from RF.[2][3] These are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves, so they are used in radio technology, among other uses. Different sources specify different upper and lower bounds for the frequency range.
^Jessica Scarpati. "What is radio frequency (RF, rf)?". SearchNetworking. Retrieved 29 January 2021.
^"J. A. Fleming, The Principles of Electric Wave Telegraphy and Telephony, London: Longmans, Green & Co., 1919, p. 364". 1919.
^A. A. Ghirardi, Radio Physics Course, 2nd ed. New York: Rinehart Books, 1932, p. 249
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