Curvilinear vector finite difference approach to the computation of waveguide modes
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We describe here a Vector Finite Difference approach to the evaluation of waveguide eigenvalues and modes for rectangular, circular and elliptical waveguides. The FD is applied using a 2D cartesian, polar and elliptical grid in the waveguide section. A suitable Taylor expansion of the vector mode function allows to take exactly into account the boundary condition. To prevent the raising of spurious modes, our FD approximation results in a constrained eigenvalue problem, that we solve using a decomposition method. This approach has been evaluated comparing our results to the analytical modes of rectangular and circula rwaveguide, and to known data for the elliptic case.
2018 ◽
Vol 14
(11)
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pp. 5969-5983
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2008 ◽
Vol 15
(3-4)
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pp. 229-253
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2004 ◽
Vol 158
(3)
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pp. 939-954
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2019 ◽
Vol 7
(1)
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pp. 1598835
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