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J band can refer to two different regions of the electromagnetic spectrum, in the radio and near-infrared.
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Radio
The J band is the range of radio frequencies from 10 GHz to 20 GHz in the electromagnetic spectrum. This is equal to wave lengths between 3 and 1.5 centimetres (1.2 and 0.59 in). The J band is in the SHF range of the radio spectrum.
The I band intersects with the X band and K band of the older classification system. The Ku band is within the J band.
Infrared astronomy
In infrared astronomy, the J band refers to an atmospheric transmission window centred on 1.25 microns (in the near-infrared).
Uses
The J band is used for satellite communications and radar.
See also
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