Efficient excitation of waveguides in Crank-Nicolson FDTD
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AuthorGonzález García, Salvador; Costen, Fumie; Fernández Pantoja, Mario; Díaz Angulo, Luis Manuel; Álvarez González, Jesús
Crank-NicolsonMetallic waveguidesFinite Difference Time Domain (FDTD) methodsaveguide excitationEigenvaluesEigenfunctions
González García, S.; et al. Efficient excitation of waveguides in Crank-Nicolson FDTD. Progress In Electromagnetics Research Letters, 17: 27–38 (2010). [http://hdl.handle.net/10481/35446]
SponsorshipThe work described in this paper and the research leading to these results has received funding from the European Community's Seventh Framework Programme FP7/2007-2013, under grant agreement no 205294 (HIRF SE project), and from the Spanish National Projects TEC2010-20841-C04-04, TEC2007-66698-C04-02, CSD2008- 00068, DEX-530000-2008-105, and the Junta de Andalucia Projects TIC1541 and P09-TIC-5327.
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.