The effect of dielectric loss in FDTD simulations of microstrip structures

David C. Wittwer, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The importance of dielectric losses in planar microstrip structures is evaluated with the finite-difference time-domain (FDTD) method. This analysis was previously not possible in many FDTD simulators due to a lack of absorbing boundary conditions (ABCs), which appropriately terminate air/dielectric interfaces for which the dielectric is lossy. The newly proposed lossy two-time derivative Lorentzian material (L2TDLM) model ABC allows for these terminations and is presented and implemented here for three-dimensional FDTD simulations. The effect of dielectric losses on several well-known planar microstrip structures is evaluated. It is shown that the inclusion of these losses in FDTD simulations, which is facilitated by the L2TDLM ABC, is, in fact, important to predict the performance of resonant structure on lossy dielectric substrates.

Original languageEnglish (US)
Pages (from-to)250-262
Number of pages13
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
StatePublished - 2001


  • Finite-difference methods
  • Microwave circuits
  • Microwave measurements
  • Numerical analysis

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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