SYSC5606-2 - SYSC 5606 - 2 Copyright 1995-2009 by R.H.M....

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Unformatted text preview: SYSC 5606 - 2 Copyright 1995-2009 by R.H.M. Hafez 1 Principles of Radio Wave Propagation Principles of Radio Wave Propagation 1. Antennas 2. Free Space Propagation 3. Path Attenuation 4. Propagation Models 5. Fading and Shadowing 6. Delay Spread 7. Classes of Fading Channels SYSC 5606 - 2 Copyright 1995-2009 by R.H.M. Hafez 2 Antennas Antennas current metal Magnetic field Electric field Electromagnetic energy flows as an interaction of magnetic and electric fields ( ) 2 * / m W H E S = E = Electric Field H = Magnetic Field S = Electromagnetic Power Density The EM energy travels at the speed of light It travels in a direction perpendicular to the E-H plane SYSC 5606 - 2 Copyright 1995-2009 by R.H.M. Hafez 3 Things That Radiate Things That Radiate The EM energy could be: Guided (cables, wires, wave-guides or fibre); or Unguided ( antennas and stray energy) In the case of guided energy, the E and H fields are contained within the transmission line Some conductor objects have structures that cannot hold on to the energy. Those object Radiate SYSC 5606 - 2 Copyright 1995-2009 by R.H.M. Hafez 4 Antenna Terms Antenna Terms = elevation angle = azimuth angle Antenna Observer 1. Radiation Intensity U( , ) = Time average power per unit solid angle S R ) , ( U 2 = 2. Directive Gain G d ( , ) = Ratio of radiation intensity in a given direction ( , ) to the average radiation intensity over all directions average d U / ) , ( U ) , ( G = 3. Directivity D = Maximum directive gain average d U max/ U ) , ( G = SYSC 5606 - 2 Copyright 1995-2009 by R.H.M. Hafez 5 Antenna Terms (cont.) Antenna Terms (cont.) 4. Power gain G p = Ratio of maximum radiation intensity to radiation intensity of an isotropic radiator isotropic max d U / U 4 ) , ( G = Isotropic...
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SYSC5606-2 - SYSC 5606 - 2 Copyright 1995-2009 by R.H.M....

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