lecture13 - Lecture 13 Electromagnetic Waves in Free Space...

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1 ECE 303 – Fall 2007 – Farhan Rana – Cornell University Lecture 13 Electromagnetic Waves in Free Space In this lecture you will learn: • Electromagnetic wave equation in free space • Uniform plane wave solutions of the wave equation • Energy and power of electromagnetic waves ECE 303 – Fall 2007 – Farhan Rana – Cornell University Basic Wave Motion v λ x Consider a wave moving in the + x -direction: The wave travels a distance equal to one wavelength in one time period Basic relation for wave motion: v f = λ v = velocity of wave propagation λ = wavelength of the wave f = frequency of the wave T = period = 1/ f 1-D wave equation: ( ) ( ) 2 2 2 2 2 , 1 , t t x a v x t x a = ( ) t x a , λ λ f T v = = = = time distance velocity
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