Ka band

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IEEE Ka band
Frequency range 26.5–40 GHz
Wavelength range 1.11 cm – 7.5 mm
Related bands K band (NATO) · SHF (ITU)
ITU Radio Band Numbers

1 2 3 4 5 6 7 8 9 10 11 12

ITU Radio Band Symbols

ELF SLF ULF VLF LF MF HF VHF UHF SHF EHF THF

NATO Radio bands

A B C D E F G H I J K L M

IEEE Radar bands

HF VHF UHF L S C X Ku K Ka V W mm

Television and radio bands

I II III IV V VI

The Ka band (Pronounced: "Kay-Ay Band") covers the frequencies of 26.5–40 GHz,[1] i.e. wavelengths from slightly over one centimeter down to 0.75 centimeters.[2] The Ka band is part of the K band of the microwave band of the electromagnetic spectrum. This symbol refers to "K-above" — in other words, the band directly above the K-band. The 30/20 GHz band is used in communications satellites, uplink in either the 27.5 GHz and 31 GHz bands,[3] and high-resolution, close-range targeting radars aboard military airplanes. Some frequencies in this radio band are used for vehicle speed detection by law enforcement.[4] Kepler Mission uses this frequency range to downlink the scientific data collected by the space telescope.

The designation "Ka-band" is from Kurz-above, which stems from the German word "kurz" meaning short.[5]

In satellite communications, the Ka band allows higher bandwidth communication, and is going to be used in the upcoming Newsat Jabiru,[6] Inmarsat I-5[7] and Iridium Next satellite series, for instance. Unlike the Ku and the C bands, however, it is far more susceptible to signal attenuation under rainy conditions.[8]

References[edit]

  1. ^ R. Ludwig, P. Bretchko, RF Circuit Design, Theory and Applications, Prentice Hall NJ, 2000.
  2. ^ "Basics of Space Flight: Electromagnetic Phenomena."
  3. ^ http://www.tech-faq.com/ka-band.shtml
  4. ^ http://hypertextbook.com/facts/2000/MaxLipkin.shtml
  5. ^ http://www.itwissen.info/definition/lexikon/K-Band-K-band.html (german)
  6. ^ http://www.newsat.com/Satellites/kaband.html
  7. ^ http://www.inmarsat.com/corporate/media-centre/press-releases/inmarsat-announces-1.2bn-investment-in-next-generation-ka-band-satellite-network
  8. ^ http://www.tele-satellite.com/TELE-satellite-0709/eng/feature.pdf