Radio Frequency - RF Spectrum

Radio signals are transmitted through electromagnetic waves, also called radio waves, in radio communication system. The radio waves have a wide frequency range starting from a few ten kiloHertz (kHz) to several thousand Mega Hertz (MHz). This wide range frequencies is called the radio spectrum or RF spectrum.

The RF spectrum is classified according to the applications of the spectrum in different service areas. The classification of the RF spectrum is given in below table along with the associated applications in communication systems.

Classification of the Radio Frequency Spectrum

Radio frequency rangeWavelength (meters) MassClassApplicintions
10-30 kHz3 x 104 - 104Very Low Frequency (VLF)Point-to-point communication (long Distance)
30-300 kHz104 - 103Low Frequency (LF)Point-to-point communication (Long Distance) and Navigation
    
300-3000 kHz103 - 102Medium Frequency (MF)Radio broadcasting
3-30 MHz102 - 10High Frequency (HF)Overseas radio broadcasting,Point to Point Radio Telegraphy and Telephony
30-300 MHz10 - 1.0Very High Frequency (VHF)FM brOadcast, television, and Radar
300-3000 MHz1.0 - 0.1Ultra heigh Frequency (UHF)Television and navigation
3000-30,000 MHz0.1 - 0.01Super High Frequency (SHF)Radar navigation and radio relays