olemus
helisagedusest kõrgemate ja infrapunasagedusest
madalamate sagedusalade kogum,
mille täpsem määratlus sõltub kohaldatavast standardist
= a set of frequency bands above the audio frequency and below the infrared frequency, the precise definition of which depends on the applicable standard

näiteid
ISO/IEC 14776, ISO/IEEE 11073-30300:
10 kHz -- 100000 MHz

IEC 600050-713, ISO/IEC 19762:
30 Hz -- 3 GHz

ülevaateid
https://www.techopedia.com/definition/5083/radio-frequency-rf

https://en.wikipedia.org/wiki/Radio_frequency