Circuit-slide-15

Circuit-slide-15 - Review of Boundary Conditions Consider...

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Review of Boundary Conditions Consider an electromagnetic field at the boundary between two materials with different properties. The tangent and the normal component of the fields must me examined separately, in order to understand the effects of the boundary.
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Tangential Magnetic Field Ampère’s law for the boundary region in the figure can be written as ( Phasor form )
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In terms of finite differences approximation for the derivatives If one lets the boundary region shrink, with a going to zero faster than b ,
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In the case of a perfect conductor , the electromagnetic fields go immediately to zero inside the material, because the conductivity is infinite and attenuates instantly the fields. The surface current is confined to an infinitesimally thin “skin”, and it accounts for the discontinuity of the tangential magnetic field, which becomes immediately zero inside the perfect conductor. For a
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This note was uploaded on 03/09/2012 for the course ECE 450 taught by Professor E.kudeki during the Spring '12 term at Illinois College.

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Circuit-slide-15 - Review of Boundary Conditions Consider...

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