Abstract
Recently, a new algorithm for wide-angle beam propagation was reported
that allowed grid points to move in an arbitrary fashion between propagation
planes and was thus capable of modeling waveguides whose widths or centerlines
varied with propagation distance. That algorithm was accurate and stable for
TE polarization but unstable for wide-angle TM propagation. This deficiency
has been found to result from an omission in one of the wide-angle terms in
the derivation of the finite-difference equation and is remedied here, resulting
in a complete algorithm accurate for both polarizations.
© 2009 IEEE
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