Radio frequency (RF) is a rate of oscillation in the range of about 3 kHz to 300 Gigahertz|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 (see mechanical filter and RF MEMS).
Although radio frequency is a rate of oscillation, the term radio frequency or its acronym RF are also used as a synonym for radio – i.e. to describe the use of wireless communication, as opposed to communication via electric wires. Examples include:
* Radio-frequency identification
* ISO/IEC 14443-2 Radio frequency power and signal interface