Circuit-slide-23

# Circuit-slide-23 - Oblique incidence Interface between...

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Oblique incidence: Interface between dielectric media Consider a planar interface between two dielectric media. A plane wave is incident at an angle from medium 1. The interface plane defines the boundary between the media. The plane of incidence contains the propagation vector and is both perpendicular to the interface plane and to the phase planes of the wave

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There are two elementary orientations ( polarizations ) for the electromagnetic fields: Perpendicular Polarization The electric field is perpendicular to the plane of incidence and the magnetic field is parallel to the plane of incidence. The fields are configured as in the Transverse Electric ( TE ) modes. Parallel Polarization The magnetic field is perpendicular to the plane of incidence and the electric field is parallel to the plane of incidence. The fields are configured as in the Transverse Magnetic ( TM ) modes. Any plane wave with general field orientation can be obtained by superposition of two waves with perpendicular and parallel polarization.

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The electric field phasors for the perpendicular polarization , with reference to the system of coordinates in the figure, are given by The propagation vector components in medium 1 are expressed as
The propagation vector components in medium 2 are expressed as The magnetic field components can be obtained as

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Assuming that the amplitude of the incident electric field is given, to completely specify the problem we need to find the amplitude of reflected and transmitted electric field. The
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Circuit-slide-23 - Oblique incidence Interface between...

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