Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 55, Issue 7, Pages 1963-1969Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2007.900258
Keywords
closed-form Green's functions; discrete complex image method (DCIM); quasi-static terms; rational function fitting method (RFFM)
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Closed-form Green's functions for unbounded planar stratified media are derived in terms of cylindrical and spherical waves. The methodology is based on a two-level approximation of the spectral-domain representation of Green's functions. This robust, efficient,,and fully numerical approach does not call for an analytical extraction of problematic behaviors, such as the quasi-static terms and the surface wave poles, prior to the spectrum fitting. Instead, the spatial-domain Green's, functions derived in this paper provide an accurate description of both the near-field singularity in the vicinity of the source and the far-field dominant behavior of the surface waves.
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