K band 558333 210166035 2008-05-04T19:56:37Z Wiher 2658370 +pl {{MWband}} ==NATO K band== The '''[[NATO]] K band''' is defined as a frequency band between 20 and 40&nbsp;GHz (7.5–15&nbsp;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&nbsp;[[GHz]]. K band between 18 and 26.5&nbsp;GHz is absorbed easily by [[water vapor]] (H<sub>2</sub>O resonance peak at 22.24&nbsp;GHz, 1.35&nbsp;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&ndash;40&nbsp;GHz, mainly used for radar and experimental communications. *K-band 18-27 GHz *[[Ku band|K<sub>u</sub> band]]: K-under band, 12&ndash;18&nbsp;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&nbsp;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]]