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Horn Antennas Presentation

Horn Antennas Presentation. Michelle Seale Eric Day Ryan Perry. History. Invented in 1897 by J.C. Bose A.B. Crawford Proved Big Bang Theory in 1959 Accurate measurements of low levels of weak background radiation. Horn Antenna. High Gain 15 dBi – 17.5 dBi Directionality

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Horn Antennas Presentation

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  1. Horn Antennas Presentation • Michelle Seale • Eric Day • Ryan Perry

  2. History • Invented in 1897 by J.C. Bose • A.B. Crawford Proved Big Bang Theory in 1959 • Accurate measurements of low levels of weak background radiation

  3. Horn Antenna • High Gain • 15 dBi – 17.5 dBi • Directionality • function of aperture • Impedance • flare matches waveguide to free space http://whatis.techtarget.com/definition/0,,sid9_gci214327,00.htmlWhatis

  4. Examples of Horn Antennas Pyramidal Conical

  5. Construction • Lc = λ Fcutoff = 2h • LO = λ open space • LG = λ in guide • (1/sqrt(1/Lo^2-1/Lc^2) http://users.skynet.be/chricat/horn/horn-javascript.html

  6. H & E Field Planes Direct H field & broad E field Direct E field & broad H field

  7. Radiation Pattern Electric Field Pattern http://web.mit.edu/mwpstr/www/foto/mwpspatr.htm http://www.ugastro.berkeley.edu/radiolab/antenna/horn_beampat.html

  8. Specifications http://www.tmeg.com/tutorials/antennas/antennas.htm

  9. 3 dB Beamwidth in Degrees 56 Aeλ: Aperture dimension in wavelengths in the Eplane Eplane = degrees Aeλ 67 Ahλ: Aperture dimension in wavelengths in the Hplane Hplane = degrees Ahλ Gain G ≈ 10 log10 (4.5*Aeλ*Ahλ) [dB over dipole] http://www.qsl.net/n1bwt/chap2.pdf

  10. Highway Patrol’s Radar Detectors • Microwave Communications • Feeds for Reflector Antennas • Arrays of Horn Antennas can be used to closely control Radiation Patterns. • WiFi 802.11b Applications http://whatis.techtarget.com/definition/0,,sid9_gci214327,00.htm “Microwave Horns and Feeds,” by Olver, Clarricoats, Kishk, and Shafail

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