Main Page | See live article | Alphabetical index 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 V-band.......40 to 75Ghz W-band.......75 to 110GHz See also: Radio propagation This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.