A novel method to analyze electromagnetic scattering of complex objects

Korada Umashankar, Allen Taflove

Research output: Contribution to journalArticlepeer-review

431 Scopus citations


The finite-difference time-domain (FD-TD) method is proposed as a means of accurately computing electromagnetic scattering by arbitrary-shaped extremely complex metal or dielectric objects excited by an external plane wave. In the proposed method, one first uses the FD-TD method to compute the near total fields within a rectangular volume which fully encloses the object. Then, an electromagnetic-field equivalence principle is invoked at a virtual surface of this rectangular volume to transform the tangential near scattered fields to the far field. To verify the feasibility of this method, the surface currents, near scattered fields, far scattered fields, and radar cross section of two canonical two-dimensional objects are presented. For these cases, it is shown that the FD-TD method provides magnitude of current and field predictions which are within ±2.5 percent and further phase values within ±3° of values predicted by the method of moments (MOM) at virtually every point including in shadow regions.

Original languageEnglish (US)
Pages (from-to)397-405
Number of pages9
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number4
StatePublished - Nov 1982


  • Electromagnetic scattering
  • complex objects
  • equivalence principle
  • far fields
  • finite-difference time-domain method
  • near scattered fields
  • radar cross section
  • surface current

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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