A direct discrete complex image method from the closed-form green's functions in multilayered media

Mengtao Yuan, Tapan K. Sarkar, Magdalena Salazar-Palma

Research output: Contribution to journalArticlepeer-review

109 Scopus citations


Sommerfeld integration is introduced to calculate the spatial-domain Green's functions (GF) for the method of moments in multilayered media. To avoid time-consuming numerical integration, the discrete complex image method (DCIM) was introduced by approximating the spectral-domain GF by a sum of exponentials. However, traditional DCIM is not accurate in the far- and/or near-field region. Quasi-static and surface-wave terms need to be extracted before the approximation and it is complicated to extract the surface-wave terms. In this paper, some features of the matrix pencil method (MPM) are clarified. A new direct DCIM without any quasi-static and surface-wave extraction is introduced. Instead of avoiding large variations of the spectral kernel, we introduce a novel path to include more variation before we apply the MPM. The spatial-domain GF obtained by the new DCIM is accurate both in the near- and far-field regions. The CPU time used to perform the new DCIM is less than 1 s for computing the fields with a horizontal source-field separation from 1.6 × 10 -4λ to 16λ. The new DCIM can be even accurate up to 160λ provided the variation of the spectral kernel is large enough and we have accounted for a sufficient number of complex images.

Original languageEnglish (US)
Pages (from-to)1025-1031
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number3
StatePublished - Mar 2006


  • Discrete complex image method (DCIM)
  • Matrix pencil method
  • Method of moments (MoM)
  • Multilayered media
  • Sommerfeld integration (SI)

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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