K Band (other)

	K Band (other) K band may refer to: * K band (IEEE), a radio frequency band from 18 to 27 GHz * K band (infrared), an atmospheric transmission window centred on 2.2 μm * K band (NATO) The NATO K band is the obsolete designation given to the radio frequencies from 20 to 40 GHz (equivalent to wavelengths between 1.5 and 0.75 cm) during the cold war period. Since 1992 frequency allocations, allotment and assignments are in l ..., a radio frequency band from 20 to 40 GHz See also * , a radio frequency band from 26.5 to 40 GHz * , a radio frequency band from 12 to 18 GHz {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	K Band (IEEE) The IEEE K-band is a portion of the radio spectrum in the microwave range of frequencies from 18 to 27-Gigahertz (GHz). The range of frequencies in the center of the K-band between 18- and 26.5-GHz is absorbed by water vapor in the atmosphere due to its resonance peak at 22.24-GHz, . Therefore these frequencies experience high atmospheric attenuation and cannot be used for long distance applications. For this reason the original K-band has been split into three bands, Ka-band, K-band, and Ku-band as detailed below. The K stands for Kurz which stems from the German word for short. Subdivisions Because of the water vapor absorption peak in the center of the band, the IEEE K-band is conventionally divided into three sub-bands: * Ku-band: K-under band, 12–18-GHz, mainly used for satellite communications, direct-broadcast satellite television, terrestrial microwave communications, and radar, especially police traffic-speed detectors. * K-band 18–27-GHz: Due to the 22-GHz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	K Band (infrared) In infrared astronomy, the K band is an atmospheric transmission window centered on 2.2 μm The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Unit ... (in the near-infrared 136 THz range). HgCdTe-based detectors are typically preferred for observing in this band. See also * Absolute magnitude * UBV photometric system References Electromagnetic spectrum Infrared imaging {{physics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]