Summary
International Symposium on Antennas and Propagation
2013
Session Number:TP-P
Session:
Number:TP-P-17
An Efficient Modal Series Representation of Green's Function of Planar Layered Media for All Ranges of Distances from Source Using CGF-PML-RFFM
A. Torabi, A. A. Shishegar,
pp.-
Publication Date:2013/10/22
Online ISSN:2188-5079
Summary:
A closed-form series representation for spatial Green's function of planar layered media for all distances from source, is presented. By terminating the structure by perfectly matched layer (PML) that is backed by perfect electric conductor (PEC) in semi-infinite layer at the top and/or bottom, the discreet set of surface wave (SW) poles is complemented by eigenmodes of the closed structure by PML which construct the continuous spectrum contribution of the original structure. Then applying characteristic Green's function (CGF) technique, a closed-form representation of spatial Green's function is derived. Very close to the source, where the large number of modes must be considered, the method is become inefficient. By combining CGF technique and rational function fitting method (RFFM), Green's function of very near field would be efficiently constructed with few number of poles extracted in modified VECTFIT algorithm in similar form of CGF-PML result. In this way, an efficient modal series representation is derived by using CGF-PML and CGF-RFFM for far from and close to the source respectively. The main advantage of this representation is that for desired accuracy the number of required modes is controllable. Excellent agreements with direct numerical integration of the spectral integral are shown in several examples.