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Optimized absorbing boundary conditions for the analysis of planar circuits using the finite difference time domain method

Research output: Contribution to journalArticle

  • CJ Railton
  • EM Daniel
  • DL Paul
  • JP McGeehan
Original languageEnglish
Pages (from-to)290 - 297
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
DatePublished - Feb 1993


It is shown that the description of absorbing boundary condition algorithms (ABCs) in terms of single incident plane waves does not provide sufficient information for choosing the best ABC for planar waveguide termination. A technique for optimizing the ABCs that results in a return loss from a wideband pulse less than -50 dB is demonstrated. This technique reduces the risk of loss of accuracy due to mode conversion at the boundary. The use of these optimized ABCs considerably improves analysis results for an important category of microstrip components. For boundaries transverse to the direction of propagation, it is shown that inaccuracy and late time instability can result if the boundary is placed in regions of high field strength.

Additional information

Publisher: IEEE Rose publication type: Journal article Terms of use: Copyright © 1993 IEEE. Reprinted from IEEE Transactions on Microwave Theory and Techniques. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

    Research areas

  • finite difference time-domain analysis, microstrip components

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