Radiofrekvensenergi

Radiofrekvensenergi is the Swedish term for radiofrequency energy, referring to electromagnetic waves whose frequencies fall between the upper limits of audio and the lower limits of microwave radiation, roughly from 3 kHz to 30 GHz. These waves propagate through the atmosphere and are utilized for various forms of wireless communication such as radio broadcasting, television transmission, mobile phone networks, radar, and satellite links. Radiofrequency energy is generated by oscillating electric currents in transmitters, which convert electrical energy into time‑varying electric and magnetic fields that travel at the speed of light.

The interaction of radiofrequency energy with matter is governed by the electromagnetic spectrum’s relevant absorption and scattering properties. In biological tissues, radiofrequency exposure can cause heating of cells due to dielectric losses, which is the principle behind microwave ovens and some medical therapies. Non‑thermal effects are a subject of ongoing research, with studies examining potential influences on cell signaling and the opening of neuronal membranes.

Regulatory agencies worldwide set limits on human exposure to radiofrequency energy to ensure safety. These limits are based on specific absorption rate (SAR) measurements, which quantify the rate at which energy is absorbed per unit mass of tissue. Radiofrekvensenergi remains a cornerstone of modern technology, enabling global communications, navigation systems, and scientific instrumentation.