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      • Department of Electrical and Electronics Engineering
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      Signal-processing techniques to reduce the sinusoidal steady-state error in the FDTD method

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      Author(s)
      Gürel, Levent
      Uğur, O.
      Date
      2000-04
      Source Title
      IEEE Transactions on Antennas and Propagation
      Print ISSN
      0018–926X
      Publisher
      IEEE
      Volume
      48
      Issue
      4
      Pages
      585 - 593
      Language
      English
      Type
      Article
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      Abstract
      Techniques to improve the accuracy of the finite-difference time-domain (FDTD) solutions employing sinusoidal excitations are developed. The FDTD computational domain is considered as a sampled system and analyzed with respect to the aliasing error using the Nyquist sampling theorem. After a careful examination of how the high-frequency components in the excitation cause sinusoidal steady-state errors in the FDTD solutions, the use of smoothing windows and digital low-pass filters is suggested to reduce the error. The reduction in the error is demonstrated for various cases.
      Keywords
      Terms—Aliasing
      Digital filters
      Electromagnetic scattering
      Finite-difference time-domain
      Incident-field array
      Sampling
      Signal processing
      Smoothing windows
      Permalink
      http://hdl.handle.net/11693/48756
      Published Version (Please cite this version)
      https://doi.org/10.1109/8.843673
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      • Department of Electrical and Electronics Engineering 4011
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