radio frequency wikipedia - EAS
- 0 Hz to 3,000 GHz (3 THz)The radio spectrum is the part of the electromagnetic spectrum with frequencies from 0 Hz to 3,000 GHz(3 THz). Electromagnetic
Hertz
The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.Electromagnetic radiation
Electromagnetic radiation (EM radiation or EMR) is the radiant energy released by certain electromagnetic processes. Visible light is one type of electromagnetic radiation; other familiar forms are invisible electromagnetic radiations, such as radio waves, infrared light and X rays.
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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 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 … See more
Electric currents that oscillate at radio frequencies (RF currents) have special properties not shared by direct current or lower audio frequency alternating current, such as the 50 or 60 Hz current used in electrical power distribution See more
Test apparatus for radio frequencies can include standard instruments at the lower end of the range, but at higher frequencies, the test equipment becomes more specialized. See more
The radio spectrum of frequencies is divided into bands with conventional names designated by the International Telecommunication Union See more
Communications
Radio frequencies are used in communication devices such as transmitters See moreWhile RF usually refers to electrical oscillations, mechanical RF systems are not uncommon: see mechanical filter and RF MEMS See more
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Radio frequency - Wikipedia
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