ECEN 5264 Lecture 08

ECEN 5264 Lecture 08 - ECEN 5264 lectromagnetic Absorption...

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Unformatted text preview: ECEN 5264 lectromagnetic Absorption Electromagnetic Absorption, Scattering, and Propagation (Propagation Effects on Satellite Communications) Professor Albin J. Gasiewski Lecture #8 February 3, 2011 COT 246 ECOT 246 303-492-9688 (O) al.gasiewski@colorado.edu 1 Classes: ECCS 1B14 TR 9:30-10:45 AM University of Colorado at Boulder Spring 2011 ECEN 5264 EM Absorption, Scattering, & Propagation Administration Reading: EASP slides EASP text (available on CULearn) Additional ionospheric references: Budden, Radio Waves in the Ionosphere (1966) Bremmer, Terrestrial Radio Waves (1949) S Dept of Commerce Ionospheric Radio U.S. Dept. of Commerce, Ionospheric Radio Wave Propagation (NBS, 1965) 2 University of Colorado at Boulder Spring 2011 ECEN 5264 EM Absorption, Scattering, & Propagation Last Lecture Doppler broadening Quantum transition types Zeeman splitting & anisotropic fractivity refractivity 3 University of Colorado at Boulder Spring 2011 ECEN 5264 EM Absorption, Scattering, & Propagation Todays Lecture Atmospheric dispersion and path delay nospheric tructure Ionospheric structure Propagation in plasmas 4 University of Colorado at Boulder Spring 2011 ECEN 5264 EM Absorption, Scattering, & Propagation Atmospheric Dispersion and Path Delay 5 Phase Velocity v p Consider CW propagating wave in z- direction: z To maintain same carrier phase: 6 Group Velocity v g Consider sum of two CW signals of approximately z the same frequency: Use trigonometric identity: 7 Group Velocity v g Consider sum of two CW signals of approximately z the same frequency: 8 Group Velocity v g To maintain same envelope hase: z phase: 9 Group & Phase Velocities for Gases 10 Phase Velocity for Gases 11 Group Velocity for Gases 12 Group Velocity for Gases 13 Group & Phase Velocities for Gases 14 Microwave Refractivity Spectrum...
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ECEN 5264 Lecture 08 - ECEN 5264 lectromagnetic Absorption...

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