An FFT-accelerated fdtd scheme with exact absorbing conditions for characterizing axially symmetric resonant structures

Kostyantyn Sirenko, Vadim L. Pazynin, Yu K. Sirenko, Hakan Bagci

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

An accurate and efficient finite-difference time-domain (FDTD) method for characterizing transient waves interactions on axially symmetric structures is presented. The method achieves its accuracy and efficiency by employing localized and/or fast Fourier transform (FFT) accelerated exact absorbing conditions (EACs). The paper details the derivation of the EACs, discusses their implementation and discretization in an FDTD method, and proposes utilization of a blocked-FFT based algorithm for accelerating the computation of temporal convolutions present in nonlocal EACs. The proposed method allows transient analyses to be carried for long time intervals without any loss of accuracy and provides reliable numerical data pertinent to physical processes under resonant conditions. This renders the method highly useful in characterization of high-Q microwave radiators and energy compressors. Numerical results that demonstrate the accuracy and efficiency of the method are presented.
Original languageEnglish (US)
Pages (from-to)331-364
Number of pages34
JournalProgress in Electromagnetics Research
Volume111
DOIs
StatePublished - 2011

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

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