Radio frequencies
Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. Such frequencies account for the following parts of the spectrum:
- Extremely low frequency (ELF): Below 3 kHz
- Very low frequency (VLF): 3-30 kHz
- Low frequency (LF): 30-300 kHz
- Medium frequency (MF): 300-3000 kHz
- High frequency (HF): 3-30 MHz
- Very high frequency (VHF): 30-300 MHz
- Ultra high frequency (UHF): 300-3000 MHz
- Super high frequency (SHF): 3-30 GHz
- Extremely high frequency (EHF): 30-300 GHz
Note: above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque to higher frequencies of electromagnetic radiation, until the atmosphere becomes transparent again in the so-called infrared and optical window freqency ranges.
The VLF band overlaps the AF (audio frequency) spectrum, which is approximately 20-20,000 Hz.
Electrical connectors designed to work at radio frequencies are known as RF connectors. RF is also the name of a standard audio/video connector, also called BNC (BayoNet Connector).
Named Frequency Bands
Microwave (US)
See also:
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