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PIER Letters  2010 

Efficient Excitation of Waveguides in Crank-Nicolson FDTD

DOI: 10.2528/PIERL10072008

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Abstract:

In this paper, we present a procedure to calculate the discrete modes propagated with Crank-Nicolson FDTD in metallic waveguides. This procedure enables the correct excitation of this kind of waveguides at any resolution. The problem is reduced to solving an eigenvalue equation, which is performed, both in a closed form, for the usual rectangular waveguide, and numerically in the most general case, validated here with a ridged rectangular waveguide.

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