K band
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2008-05-04T19:56:37Z
Wiher
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+pl
{{MWband}}
==NATO K band==
The '''[[NATO]] K band''' is defined as a frequency band between 20 and 40 GHz (7.5–15 mm).
==IEEE K band==
The '''[[IEEE]] K band''' is a portion of the [[electromagnetic spectrum]] in the [[microwave]] range of frequencies ranging between 18 and 27 [[GHz]]. K band between 18 and 26.5 GHz is absorbed easily by [[water vapor]] (H<sub>2</sub>O resonance peak at 22.24 GHz, 1.35 cm).
===Subdivisions===
The IEEE K band is conventionally divided into three sub-bands:
*[[Ka band|K<sub>a</sub> band]]: K-above band, 26.5–40 GHz, mainly used for radar and experimental communications.
*K-band 18-27 GHz
*[[Ku band|K<sub>u</sub> band]]: K-under band, 12–18 GHz, mainly used for satellite communications, terrestrial microwave communications, and radar, especially police traffic-speed detectors.
==Infrared astronomy K band==
[[Infrared astronomy|Infrared astronomers]] refer to the infrared region around 2.2 micrometres wavelength (136 THz) as ''K-band''.
==Name==
The designation "K-band" stems from the German word "kurz" meaning ''short''.{{Fact|date=April 2008}}
==See also==
{{Radio spectrum}}
{{EMSpectrum}}
[[Category:Microwave bands]]
[[pl:Pasmo K]]