K band
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K band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging between 12 and 93 GHz. K band between 18 and 26.5 GHz is absorbed easily by water vapor (H2O resonance peak at 22.24 GHz, 1.35 cm).
The NATO K band is defined as frequency band between 20 and 40 GHz (7.5–15 mm).
Infrared astronomers refer to the infrared region around 2.2 micrometres wavelength (136 THz) as K-band.
Subdivisions
The K band is conventionally divided into two sub-bands:
- Ka band: K-above band, 18–40 GHz for radar and general communications
- Ku band: K-under band, 12–18 GHz for satellite communications
| Electromagnetic Spectrum Sorted by wavelength, short to long Gamma ray | X-ray | Ultraviolet | Optical spectrum | Infrared | Terahertz radiation | Microwave | Radio waves | Visible (optical) spectrum: Violet | Blue | Green | Yellow | Orange | Red | Microwave spectrum: V band | K band: Ka band, Ku band | X band | C band | S band | L band | Radio spectrum: EHF | SHF | UHF | VHF | HF/Shortwave | Mediumwave | Longwave | VLF | ULF |SLF | ELF |