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 wavelength In physics and mathematics, wavelength or spatial period of a wave or periodic function is the distance over which the wave' ..., 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] [Amazon]
	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 are 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 , 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon]
	K Band (infrared) In infrared astronomy, the K band is an atmospheric transmission window centered on 2.2 μm (in the near-infrared 136 THz range). HgCdTe-based detectors are typically preferred for observing in this band. Photometric system In astronomy, a photometric system is a set of well-defined passbands (or optical filters), with a known sensitivity to incident radiation. The sensitivity usually depends on the optical system, detectors and filters used. For each photometric s ...s used in astronomy are sets of filters or detectors that have well-defined windows of absorption, based around a central peak detection frequency and where the edges of the detection window are typically reported where sensitivity drops below 50% of peak. Various organizations have defined systems with various peak frequencies and cutoffs in the K band, including , and KS, and Kdark. Table 1., Filter sets used at Mauna Kea and the South Pole. See also * Absolute magnitude References Electromagn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon]