IEEE 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).

NATO K band

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The NATO K band is defined as frequency band between 20 and 40 GHz (7.5–15 mm).

Infrared astronomy K band

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Infrared astronomers refer to the infrared region around 2.2 micrometres wavelength (136 THz) as K-band.

Subdivisions

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The K band is conventionally divided into two sub-bands:

• K_a band: K-above band, 18–40 GHz for radar and general communications
• K_u band: K-under band, 12–18 GHz for satellite communications

Microwave bands