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An in-depth exploration of various aspects of wireless networks, focusing on antennas, propagation, and signal encoding. Topics covered include radiation patterns, types of antennas, antenna gain, sky wave propagation, line-of-sight propagation, impairments, and encoding techniques. Students will gain a solid understanding of the fundamental concepts and practical applications in this field.
What you will learn
Typology: Thesis
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o (^) Radiates power equally in all directions
o (^) Half-wave dipole antenna (or Hertz antenna) o (^) Quarter-wave vertical antenna (or Marconi antenna)
o (^) Used for terrestrial microwave and satellite applications o (^) Larger the diameter, the more tightly directional is the beam
o (^) Amateur radio o (^) CB radio
o (^) Satellite communication ā signal above 30 MHz not reflected by ionosphere o (^) Ground communication ā antennas within effective line of site due to refraction
o (^) Velocity of electromagnetic wave is a function of the density of the medium o When wave changes medium, speed changes o (^) Wave bends at the boundary between mediums
o (^) Received signal must have sufficient strength so that circuitry in the receiver can interpret the signal o (^) Signal must maintain a level sufficiently higher than noise to be received without error o (^) Attenuation is greater at higher frequencies, causing distortion
ā ā ā ā ā ā = = ļ¬ Ļ d P P L r t dB 4 10 log 20 log = ā 20 log ( Ī» )+ 20 log( d )+ 21. 98 dB 20 log ( ) 20 log( ) 147. 56 dB 4 20 log ā= + ā ā ā ā ā ā = f d c Ļ fd
4 = = = Ī» Ī» Ļ