The Ka band (pronounced as either "kay-ay band" or "ka band") is a portion of the microwave part of the electromagnetic spectrum defined as frequencies in the range 26.5–40 gigahertz (GHz),[1] i.e. wavelengths from slightly over one centimeter down to 7.5 millimeters.[2] The band is called Ka, short for "K-above" because it is the upper part of the original NATO K band, which was split into three bands because of the presence of the atmospheric water vapor resonance peak at 22.24 GHz (1.35 cm), which made the center unusable for long range transmission. The 30/20 GHz band is used in communications satelliteuplinks 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] The Kepler Mission used this frequency range to downlink the scientific data collected by the space telescope.
Planned future satellite projects using Ka-band include Amazon's Project Kuipersatellite internet constellation in LEO,[13]SES's multi-orbit satellite internet system of the SES-17 satellite in GEO (launched in October 2021; in position and fully operational in June 2022)[14] and O3b mPOWER constellation in MEO (first two satellites launched December 2022, nine more 2023-2024, and starting service in Q3 2023).[15][16][17]
band, band, pronounced, either, band, band, portion, microwave, part, electromagnetic, spectrum, defined, frequencies, range, gigahertz, wavelengths, from, slightly, over, centimeter, down, millimeters, band, called, short, above, because, upper, part, origina. The Ka band pronounced as either kay ay band or ka band is a portion of the microwave part of the electromagnetic spectrum defined as frequencies in the range 26 5 40 gigahertz GHz 1 i e wavelengths from slightly over one centimeter down to 7 5 millimeters 2 The band is called Ka short for K above because it is the upper part of the original NATO K band which was split into three bands because of the presence of the atmospheric water vapor resonance peak at 22 24 GHz 1 35 cm which made the center unusable for long range transmission The 30 20 GHz band is used in communications satellite uplinks 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 The Kepler Mission used this frequency range to downlink the scientific data collected by the space telescope IEEE Ka bandFrequency range27 40 GHzWavelength range11 1 7 5 mmRelated bandsK NATO SHF ITU 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 6 It was first used in the experimental ACTS Gigabit Satellite Network and is currently used for high throughput satellite Internet access in geostationary orbit GEO by the Inmarsat I 5 system 7 and Kacific K 1 satellite 8 in low Earth orbit LEO by the SpaceX Starlink system 9 and the Iridium Next satellite series 10 it is also use in medium Earth orbit MEO by the SES O3b system 11 and the James Webb Space Telescope 12 Planned future satellite projects using Ka band include Amazon s Project Kuiper satellite internet constellation in LEO 13 SES s multi orbit satellite internet system of the SES 17 satellite in GEO launched in October 2021 in position and fully operational in June 2022 14 and O3b mPOWER constellation in MEO first two satellites launched December 2022 nine more 2023 2024 and starting service in Q3 2023 15 16 17 The Ka band is more susceptible to rain attenuation than is the Ku band which in turn is more susceptible than the C band 18 The frequency is commonly used by cosmic microwave background experiments The 5th generation mobile networks will also partially overlap with Ka band 28 38 and 60 GHz citation needed See also EditSaorsat Ireland satellite television on Ka bandReferences Edit R Ludwig P Bretchko RF Circuit Design Theory and Applications Prentice Hall NJ 2000 Basics of Space Flight Section I The Environment of Space Ka Band 6 April 2019 Elert Glenn Frequency of a Police Radar Gun http www itwissen info definition lexikon K Band K band html german L Ku Ka band satellites what does it all mean Get Connected 11 September 2017 Accessed 27 April 2021 Inmarsat Inmarsat Announces 1 2bn Investment in Next Generation Ka Band Satellite Network Press Release Archived from the original on May 11 2013 Retrieved August 6 2013 Kacific Reveals Plans for Second Satellite Via Satellite 30 October 2020 Accessed 28 April 2021 SpaceX seeks FCC permission for operating all first gen Starlink in lower orbit SpaceNews com 2020 04 21 Retrieved 2020 04 23 Iridium NEXT Gunter s Space Page Accessed 28 April 2021 Four New Satellites Ride Into Space To Join Growing SES Constellation Space com 4 April 2019 Accessed 28 April 2021 James Webb Space Telescope User Documentation JWST Communications Subsystem Space Terlescope Science Institute Accessed 28 April 2021 Foust Jeff 15 December 2020 Amazon unveils flat panel customer terminal for Kuiper constellation SpaceNews Retrieved 29 December 2020 SES 17 Ka Band Satellite is Now Operational Via Satellite 16 June 2022 Accessed 27 June 2022 SES Satellites Agility Achieved With ARC and Kythera Space Solutions SatNews 24 November 2020 Accessed 28 April 2021 SES YTD 2021 Results PDF SES S A 4 November 2021 p 4 Retrieved 27 January 2022 SpaceX launches first pair of O3b mPower satellites SpaceNews 16 December 2022 Accessed 27 December 2022 Miller Peter Ka Band the future of satellite communication PDF Retrieved 2016 07 06 This electromagnetism related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Ka band amp oldid 1130205813, wikipedia, wiki, book, books, library,
