MIT
8 03 -
Vibrations and Waves
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Physics 8 03 Vibrations and Waves Lecture 16 EM waves meet conductors Waveguides Last time Dipole radiation Total power radiated Larmor formula Scattering charges accelerated by E E0 cos t Larmor formula radiated flux 4 EM waves near perfect conductors Boundary conditions s E and E 0 0 B 0 and B 0 J s Last time transmission lines Two conductors TEM modes Both E and B field are transverse to direction of propagation k Confine E and B in two dimensions Get wave propagation in third dimension V I L0 z t V I C0 t z V I L0C0 2 2 z t 2 2 I V L0C0 2 2 z t 2 2 L0 Z0 C0 Waveguides Single conductor TE or TM mode but not TEM Cutoff frequency
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