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Circuit-slide-24 - Dielectric Wave Guide A dielectric...

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Unformatted text preview: Dielectric Wave Guide A dielectric waveguide is a structure which exploits total reflection at dielectric interfaces to guide electromagnetic radiation. The simplest case is the symmetric dielectric slab wave guide For guidance one must have Similarly to the parallel plate waveguide, we assume propagation along the z- direction and uniform conditions along the y- direction . Guided waves are launched with angle of incidence larger than the critical angle , so that total (internal) reflection takes place. Waves launched at smaller angles suffer partial refraction into the cladding and eventually the power in the core region will disappear for sufficiently long wave guides. We consider again TE and TM modes. Only certain angles of incidence are allowed, but here the reflection coefficient for total reflection is a complex quantity, introducing a phase shift in the reflected field, which depends on the angle of incidence. In the case of metal plates, instead, there is always a phase shift of 180...
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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-24 - Dielectric Wave Guide A dielectric...

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