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Electromagnetic Radiation & Satellites

Electromagnetic Radiation & Satellites. Antenna Design Pete Arvedson California Science Conference October 26, 2013. Hosted by Satellite Educators Association Lesson plan development supported by a grant from NOAA-CREST West. Session Objectives. Relate wavelength and frequency

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Electromagnetic Radiation & Satellites

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  1. Electromagnetic Radiation & Satellites Antenna Design Pete Arvedson California Science Conference October 26, 2013 Hosted by Satellite Educators Association Lesson plan development supported by a grant from NOAA-CREST West

  2. Session Objectives Relate wavelength and frequency Construct 1/10th scale model wave Calculate antenna length Apply to 5-element Yagi antenna design Build 1/10th scale antenna California Science Conference 2013

  3. Solar radiation reaches Earth surface California Science Conference 2013

  4.  Surface features reflect solar radiation to remote sensors California Science Conference 2013

  5.   Satellite sends radio signal from remote sensors to Earth station California Science Conference 2013

  6. crest trough Wave Properties wavelength, λ (meters) amplitude How many waves pass a point each second = frequency, ν (1/sec or Hertz) California Science Conference 2013

  7. Electromagnetic Spectrum California Science Conference 2013

  8. c ν λ Wave Properties c = λν λ = c / ν ν = c / λ c = speed of light = 299,792,458 m/s -in vacuum ~ 300 x 106 m/s -in metal = 280.225 x 106 m/s California Science Conference 2013

  9. Wavelength from Frequency POES WEFAX frequency = 137.50 MHz λ = c / ν λ = California Science Conference 2013

  10. Build Wave Model: 1/10 Scale wavelength: λ= 2.18 m 1/10 scale model wave: λ= 21.8 cm California Science Conference 2013

  11. Antenna Size – First Look • Antenna length should match radio signal wavelength • Wavelength for 137.5MHz = 2.18 m • ½ or ¼ wavelength is best! • 2.18 / 2 = 1.09 m EMR energy resonates in antenna metal wire producing current California Science Conference 2013

  12. Antenna Size - Actual 2.182 m 2.038 m ½ wavelength = 1.019 m 10.19 cm 1/10 scale model antenna length = California Science Conference 2013

  13. Yagi Antenna 1926 HidetsuguYagi & SintaroUdaTohoku Imperial University, Japan Driven element; parasitic directors & reflector Highly directional & wavelength selective California Science Conference 2013

  14. Brent Stirton, http://ngm.nationalgeographic.com California Science Conference 2013

  15. Design Your Antenna 87.4 cm 8.74 cm 3.0 cm 92.0 cm 9.20 cm 96.8 cm 9.68 cm 18.3 cm 10.19 cm 4.1 cm 112.1 cm 11.21 cm California Science Conference 2013

  16. Extension Build scale models other antenna types Calculate antenna length for 1693 MHz Build several real antennas & determine which is best for satellite reception Compare/Contrast crossed Yagi with QHA Build chicken wire parabolic reflector California Science Conference 2013

  17. CA Science Standards • Grades 9-12: Physics • Waves have characteristic properties that do not depend on the type of wave (a, c, e) • Electric and magnetic phenomena are related and have many practical applications (e, f, h) • Grades 9-12: I & E • Scientific progress is made by asking meaningful questions and conducting careful investigations (a, d, g) California Science Conference 2013

  18. Contact Information Pete Arvedson - arvedson@aol.com Check out lesson plans in Satellite Educators Association (SEA) monthly Newsletter… http://www.SatEd.org More opportunities to involve students doing research:SEA’s M.Y. S.P.A.C.E.* Program - an international high school collaborative environmental research program using satellite-based data… http://www.calstatela.edu/programs/crest/ *(Multinational Youth Studying Practical Applications of Climatic Events) California Science Conference 2013

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