Definition of radio frequency

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Photonics Dictionary

radio frequency: Radio frequency (RF) refers to the range of electromagnetic waves used for wireless transmission of signals, typically spanning frequencies from about 3 kHz to 300 GHz. In RF communications, information is carried by modulating the amplitude, frequency, or phase of radio waves, which can propagate through air, space, or various materials. RF technology supports many systems, including broadcast radio and television, radar, satellite links, mobile communications, and wireless networking.

RF signals travel much longer distances through the atmosphere than optical signals and can penetrate obstacles such as walls, clouds, and buildings, making them ideal for wide-area and mobile communications. While RF offers lower bandwidth and data rates compared to optical systems, it remains essential for applications requiring wireless connectivity, broad coverage, and reliable transmission in non-line-of-sight environments. Advances in RF engineering, including millimeter-wave and terahertz technologies, are expanding the capabilities of modern wireless communication systems.

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