Abstract
A novel implementation of discrete complex image method (DCIM) based on the Sommmerfeld branch cut is proposed to accurately capture the far-field behavior of the layered medium Green's function as a complement to the traditional DCIM. By contour deformation, the Green's function can be naturally decomposed into branch-cut integration (radiation modes) and pole contributions (guided modes). For branch-cut integration, matrix pencil method is applied, and the alternative Sommerfeld identity in terms of kz integration is utilized to get a closed-form solution. The guided modes are accounted for with a pole-searching algorithm. Both one-branch-cut and two-branch-cut cases are studied. Several numerical results are presented to validate this method.
Original language | English (US) |
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Article number | 5765649 |
Pages (from-to) | 419-422 |
Number of pages | 4 |
Journal | IEEE Antennas and Wireless Propagation Letters |
Volume | 10 |
DOIs | |
State | Published - 2011 |
Externally published | Yes |
Keywords
- Branch cut
- Green's function
- discrete complex image method (DCIM)
- layered medium
- pole
ASJC Scopus subject areas
- Electrical and Electronic Engineering