Transcription of Chapter 9: Electromagnetic Waves - MIT OpenCourseWare
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Chapter 9: Electromagnetic Waves Waves at planar boundaries at normal incidence Introduction Chapter 9 treats the propagation of plane Waves in vacuum and simple media, at planar boundaries, and in combinations confined between sets of planar boundaries, as in waveguides or cavity resonators. Chapter 10 then discusses how such Waves can be generated and received by antennas and antenna arrays. More specifically, Section explains how plane Waves are reflected from planar boundaries at normal incidence, and Section treats reflection and refraction when the Waves are incident at arbitrary angles. Section then explains how linear combinations of such Waves can satisfy all boundary conditions when they are confined within parallel plates or rectangular cylinders acting as waveguides.
o H (z,t )= yˆ (Eo ηo )cos (ωt −kz) ⎡⎣Am-1⎤⎦ (9.1.2) This unambiguously defines the source, and the boundary is similarly unambigous: = ∞ and σ therefore E =0 for z ≥0. This more complete problem definition is sufficient to yield a unique
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