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.

IEEE K band
Frequency range
18 – 27 GHz
Wavelength range
1.67 – 1.11 cm
Related bands
Radio bands
ITU
1 (ELF) 2 (SLF) 3 (ULF) 4 (VLF)
5 (LF) 6 (MF) 7 (HF) 8 (VHF)
9 (UHF) 10 (SHF) 11 (EHF) 12 (THF)
EU / NATO / US ECM
IEEE
Other TV and radio

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,[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.

gollark: No, it has an uncountably infinite number.
gollark: We use version numbers to clearly delineate support.
gollark: No, feature updates.
gollark: Anomalous apiomathics v1.5.
gollark: We are also 12 steps behind you, 124+8i steps to the left, and 4+44444i to the right; in other words, we enclose UCorp™ in step-space on all sides.

See also

References
  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
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.