 Waveguides
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Linas
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Sun Jun 24 2012, 08:37AM
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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
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I have a task for calculating amplitudes in wave-guide, with triangle dialectic target inside.
Any one know how to do this ?
m0 n0 wave come from -Z (-inf) and hit that triangle inside waveguide
Here i have all projections for EM waves and all modes
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WaveRider
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Registered Member #29
Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
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This is not a trivial problem. If you have an incident TE10 wave (E is y-directed), then transmitted and reflected waves must be TEm0 type. This simplifies the analysis. However, the method I describe will work for any mode type. You can approximate the triangular dielectric interface as a stair-stepped interface. You find the pertinent modes of the dielectric loaded waveguide and represent every "step" as a short piece of waveguide where we "match modes" at the ports between one section and the next. This is done by enforcing continuity on the tangential (to the waveguide ports) E and H fields. This will require the computations of lots of inner-product integrals and the numerical solution of the resulting linear system of equations. It is VERY IMPORTANT to include evanescent modes in the analysis, otherwise the results will be wrong. Google "electromagnetic mode matching technique"..
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