lecture34 - 1 ECE 303 Fall 2007 Farhan Rana Cornell...

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Unformatted text preview: 1 ECE 303 Fall 2007 Farhan Rana Cornell University Lecture 34 Electromagnetic Scattering In this lecture you will learn: Scattering of electromagnetic waves from objects Rayleigh Scattering Why the sky is blue Radar range equation ECE 303 Fall 2007 Farhan Rana Cornell University Scattering of Electromagnetic Waves from a Plane Interface z =0 z z k k i = r E i H i Incident, transmitted, and reflected waves are all plane waves The reflected and transmitted waves can also be called the scattered waves z k k i = r E r H r z k k t = r E t H t o o o t x 2 ECE 303 Fall 2007 Farhan Rana Cornell University Scattering of Electromagnetic Waves from Objects Incident plane wave: Scattered wave: ( ) r E i r r ( ) r E s r r o 1 Questions: How does one find the scattered field? How much power from the incident field goes into the scattered field? In which direction(s) does the scattered power go? phase fronts ECE 303 Fall 2007 Farhan Rana Cornell University Scattering of Electromagnetic Waves From Spherical Particles Incident plane wave: ( ) r E i r r o Assumption: Assume that the particle radius is much smaller than the wavelength of the incident wave, i.e.: 1 << ka- When the above condition holds the scattering is called Rayleigh Scattering- When the above condition does not hold the scattering is called Mie Scattering When ka << 1, the particle sees a uniform E-field that is slowly oscillating in time 1 a 2 3...
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This note was uploaded on 02/02/2008 for the course ECE 3030 taught by Professor Rana during the Fall '06 term at Cornell University (Engineering School).

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lecture34 - 1 ECE 303 Fall 2007 Farhan Rana Cornell...

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