MIT
8 03 -
Vibrations and Waves
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Physics 8 03 Vibrations and Waves Lecture 15 EM waves meet conductors Transmission Lines Last time Radiation from accelerating charges Dipole approximation q a n t r c E rad r t 4 0 rc 2 1 B rad r t r E rad c 1 S rad r t E rad B rad 0 u c r d Last time oscillating dipole a r z t z0 cos t z a t 2 z0 cos t z a n t r c 2 z0 cos t kr sin x cos z sin Erad r t q a t sin 4 0rc q a t sin 2 2 qz cos t kr sin 0 x cos z sin 2 4 0rc 2 qz t kr cos sin 0 Brad r t y 3 3 4 0rc 4 0rc q2 z02 4 cos2 t kr sin2 q2a2 t sin2 r k S rad r t 2 2 3 2 2 3 16 0r c 16 0r c Dipole radiation contd Total power radiated Scattering EM waves near perfect conductors Boundary conditions Transmission lines
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