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This lecture presents a modern approach for the computation of
Mathieu functions. These functions find application in boundary
value analysis such as electromagnetic scattering from elliptic
cylinders and flat strips, as well as the analogous acoustic and
optical problems, and many other applications in science and
engineering. The authors review the traditional approach used for
these functions, show its limitations, and provide an alternative
"tuned" approach enabling improved accuracy and convergence. The
performance of this approach is investigated for a wide range of
parameters and machine precision. Examples from electromagnetic
scattering are provided for illustration and to show the
convergence of the typical series that employ Mathieu functions for
boundary value analysis.
This lecture provides a tutorial introduction to the Nystroem and
locally-corrected Nystroem methods when used for the numerical
solutions of the common integral equations of two-dimensional
electromagnetic fields. These equations exhibit kernel
singularities that complicate their numerical solution. Classical
and generalized Gaussian quadrature rules are reviewed. The
traditional Nystroem method is summarized, and applied to the
magnetic field equation for illustration. To obtain high order
accuracy in the numerical results, the locally-corrected Nystroem
method is developed and applied to both the electric field and
magnetic field equations. In the presence of target edges, where
current or charge density singularities occur, the method must be
extended through the use of appropriate singular basis functions
and special quadrature rules. This extension is also described.
Table of Contents: Introduction / Classical Quadrature Rules / The
Classical Nystroem Method / The Locally-Corrected Nystroem Method /
Generalized Gaussian Quadrature / LCN Treatment of Edge
Singularities
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