Radio frequency

Radio frequency (RF) is electromagnetic radiation conventionally spanning 3 kHz to 300 GHz. It carries signals in radio communication and includes frequencies used by broadcasting, radar, and wireless networks.

Electromagnetic wave: A disturbance of electric and magnetic fields that propagates through space and carries energy. RF is the part of the electromagnetic spectrum whose waves are used for communication.
Radio broadcasting: The one-to-many transmission of audio or audiovisual programming by radio waves. Broadcast services occupy assigned RF bands to reach many receivers at once.
Frequency: The number of repeating cycles of a periodic process per unit time. Frequency specifies where an RF signal lies within the radio spectrum.
Microwave: The electromagnetic region commonly associated with frequencies from about 300 MHz to 300 GHz. Microwave frequencies form the upper part of the conventional RF range.
Spectrum allocation: The designation of frequency ranges for particular radio services or uses. Allocation coordinates competing RF services and limits harmful interference.
Modulation: The process of varying a carrier signal to encode information. RF communication conveys information by changing a carrier’s amplitude, frequency, or phase.
Wi-Fi: A family of wireless local-area networking standards based on IEEE 802.11. Wi-Fi carries data over RF bands shared with other wireless devices.
Wavelength: The distance between corresponding points on successive cycles of a wave. An RF wave’s wavelength depends on its frequency and sets antenna dimensions.
Terahertz radiation: Electromagnetic radiation between the microwave and infrared regions, typically around 0.1–10 THz. Terahertz radiation lies mostly above the conventional 300 GHz upper RF boundary.
Electromagnetic interference: Disruption of an electronic system caused by unwanted electromagnetic energy. RF devices can interfere when emissions overlap or couple into sensitive equipment.

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