Electromagnetic Radiation. Powerpoint Templates. Hertz (1857-1894). 1887 (22 years after Maxwell equations) discovered radio waves. Maxwell Equations. Constitutive Equations. Vacuum D = ε o E B = μ o H Conductors J = σ E. Linear media D = ε E B = μ H. Non linear media.
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1887 (22 years after Maxwell equations) discovered radio waves
D = εo E
B = μo H
J = σ E
D = ε E
B = μ H
Non linear media
P = χ(1)E + χ(2)E2 + χ(3)E3 + …
D = εo(E + χ(1)E + χ(2)E2 + χ(3)E3 + …)
D = εo(E + P)
Isotropic media => Spherical field
Nº of field lines entering a volume must be equal to the nº of lines living the volume (no magnetic charge accumulation allowed). => Field lines are closed loops.
Possible solution: Plane waves
Refraction & Reflection
Law of reflection: θi = θr
Snell’s law: n1sinθi = n2sinθt
Brewster's angle: 56.4º
Total reflection: 42º