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, 1.35 cm. 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.

IEEE K band
Frequency range
18 – 27 GHz
Wavelength range
1.67 – 1.11 cm
Related bands


Because of the water vapor absorption peak in the center of the band,[1] the IEEE K band is conventionally divided into three sub-bands:

  • Ka band: K-above band, 26.5–40 GHz, mainly used for radar and experimental communications. NASA's Kepler spacecraft is the first NASA mission to use Ka band DSN communications.[2]
  • K-band 18–27 GHz: Due to the 22 GHz water vapor absorption line this band has high atmospheric attenuation and is only useful for short range applications.
  • 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.

Amateur radio

The Radio Regulations of the International Telecommunication Union allow amateur radio and amateur satellite operations in the frequency range 24.000 GHz to 24.250 GHz, which is known as the 1.2-centimeter band. It is also referred to as the K band by AMSAT.

See also


  1. ^ du Preez, Jaco; Sinha, Saurabh (2016). Millimeter-Wave Antennas: Configurations and Applications. Springer. p. 3. ISBN 3319350684.
  2. ^ http://www.nasa.gov/mission_pages/kepler/news/keplerm-20110617.html#.VK7w_SeE0fo
Index of physics articles (K)

The index of physics articles is split into multiple pages due to its size.

To navigate by individual letter use the table of contents below.

K band

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), a radio frequency band from 20 to 40 GHz


Nimiq-4 is a Canadian geosynchronous communications satellite. It was launched aboard a Proton-M/Briz-M carrier rocket at 21:47 GMT on 19 September 2008. It was positioned at 82ºW longitude, and operated by Telesat Canada.

The satellite was constructed by EADS Astrium, using a Eurostar-3000S bus. It is powered by two solar arrays, with a span of 39 metres (128 ft), producing 12 kW of power. The launch mass of the satellite is 4.8 tonnes (4.7 long tons). It carries 40 transponders, 32 of which operate in the NATO J band (IEEE Ku band), and 8 which operate in the NATO K band (IEEE Ka band).

Visible (optical)
Wavelength types

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.