Smart meters use low-energy radio frequency waves to transmit information across distances. Radio frequency (RF) waves are a form of electromagnetic energy. They move through space at the speed of light and can be man-made or occur naturally. They move through space at the speed of light and can be man-made or occur naturally.
RF itself has become synonymous with wireless and high-frequency signals, describing anything from AM radio between 535 kilohertz (kHz) and 1605 kHz to computer local area networks (LANs) at 2.4 gigahertz (GHz). However, RF has traditionally defined frequencies from a few kHz to roughly 1 GHz. If one considers microwave frequencies as RF, this range extends to 300 GHz.
RF and wireless have been around for over a century with Alexander Popov and Sir Oliver Lodge laying the groundwork for Guglielmo Marconi's wireless radio developments in the early 20th century.