Notes 14 Spring 2005

Notes 14 Spring 2005 - Notes 14 Spring 2005.doc Example: An...

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Notes 14 Spring 2005.doc Example: An EM wave with circular, right-hand polarization is normally incident from air onto a semi- infinite slab of plexiglass ( 0 , 45 . 3 ) r r = ε′ = ε′ . Calculate the percentages of the incident power that are reflected and transmitted. Also, describe the polarizations of the refl cted and transmitted waves. e Answer: Recall the power equations: ( ) i 2 t i 2 r P 1 P and P P Γ = Γ = The percentage of incident power that is reflected is given by 100 100 P P 2 i r × Γ = × . Find : Γ ° = = + = ε + ε η ε ε η = ε ε µ + ε ε µ ε ε µ ε ε µ = η + η η η = Γ 180 3 . 0 3 . 0 1 1 45 . 3 1 1 1 45 . 3 1 1 1 1 1 1 r 2 r o 1 r 2 r o 1 r o o 2 r o o 1 r o o 2 r o o 1 2 1 2 09 . 0 3 . 0 2 2 = = Γ and the percentage of the incident power that is reflected is 9%. Similarly, ( ) () 91 100 09 . 0 1 100 1 100 P P 2 i t = × = × Γ = × % is the percentage of the incident power that is transmitted. Note the conservation of power. Also, since the transmitted wave will have the same polarization sense of rotation as the incident wave

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This note was uploaded on 01/20/2012 for the course EE 4460 taught by Professor Czarnecki during the Fall '10 term at LSU.

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Notes 14 Spring 2005 - Notes 14 Spring 2005.doc Example: An...

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