Radio frequency

Radio frequency, or RF, is a carrier, or alternating current with or without
a signal, at a frequency that can radiate, or propagate, if not shielded.
Such frequencies account for the following parts of the electromagnetic
spectrum:

     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.

Analog signals that are not RF include IF (intermediate frequency) and AF
(audio frequency, 20-20000 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

   * Band III - 174-245 MHz
   * ISM band......specific frequencies vary

Microwave (US)

   * L-band........1 to 2GHz
   * S-band........2 to 4GHz
   * C-band........4 to 8GHz
   * X-band........8 to 12GHz
   * Ku-band......12 to 18GHz
   * K-band.......18 to 26GHz
   * Ka-band......26 to 40GHz

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