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DATA COMMUNICATION NETWORKS

DATA COMMUNICATION NETWORKS. MIRZA IRFAN BAIG Asst Prof Department of Information Technology Balaji Institute of Technology & Sciences Laknepally, Narsampet zissiar2@yahoo.com +91-9985287172. Electromagnetic Wave Propagation. EM Wave Plane and Spherical waves Isotropic source

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DATA COMMUNICATION NETWORKS

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  1. DATA COMMUNICATION NETWORKS MIRZA IRFAN BAIG Asst Prof Department of Information Technology Balaji Institute of Technology & Sciences Laknepally, Narsampet zissiar2@yahoo.com +91-9985287172

  2. Electromagnetic Wave Propagation • EM Wave • Plane and Spherical waves • Isotropic source • EM wave attenuation • Refraction and Reflection • Huygens principle • Interference • Propagation of EM Waves; sky, ground, space, duct • Free space path loss

  3. Rays and Wavefronts: Plane wave http://www.phy.ntnu.edu.tw/java/emWave/emWave.html

  4. Rays and Wavefronts: Spherical wave http://physics.nad.ru/Physics/English/1wa_tmp.htm

  5. Rays and Wavefronts: Isotropic source P = power density Prad = total power radiated [W] R = radius of the sphere

  6. EM Wave Attenuation and Absorption Attenuation is due to spherical spreading of the wave, non of the radiated power is lost Absorption is due to energy transfer from the EM-wave to the atoms and molecules of the atmosphere

  7. Properties of Radio Waves: Refraction n1 = refractive index material 1 n2 = refractive index material 2 1= angle of incidence 2= angle of refraction

  8. Refraction in a gradient medium

  9. Properties of Radio Waves: Reflection

  10. Diffraction: Huygen’s principle for a plane wave http://id.mind.net/~zona/mstm/physics/waves/propagation/huygens3.html

  11. Diffraction: Huygen’s principle slot edge http://physics.nad.ru/Physics/English/1wd_tmp.htm http://www.rit.edu/~visualiz/projects/diffraction.html

  12. Interference http://physics.nad.ru/Physics/English/2wa_tmp.htm

  13. Terrestrial propagation of EM Waves

  14. Surface wave propagation

  15. Space wave propagation

  16. Radio Horizon

  17. Duct propagation

  18. Sky wave propagation Ionosphere

  19. Sky wave Higher RF frequencies are less refracted

  20. Virtual height

  21. Sky wave: Skip Distance

  22. Sky wave: daytime vs. nighttime propagation

  23. Free-space path loss (spreading loss) Lp= free-space path loss D = distance (kilometers) f = frequency (hertz) = wavelength (meters) c = velocity of light in free space

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