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An impedance boundary condition for the efficient matched termination of waveguides in FDTD simulations
Author(s) -
Pereda José A.,
Vegas Ángel,
Prieto Andrés,
Caño Oscar
Publication year - 2002
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.10400
Subject(s) - finite difference time domain method , microwave , reflection coefficient , waveguide , perfectly matched layer , wideband , electrical impedance , reflection (computer programming) , boundary value problem , boundary (topology) , optics , frequency band , physics , function (biology) , acoustics , engineering , electronic engineering , mathematical analysis , mathematics , electrical engineering , computer science , telecommunications , antenna (radio) , evolutionary biology , biology , programming language
This Letter introduces a novel impedance boundary condition (IBC) for the matched termination of waveguide ports in finite‐difference–time‐domain (FDTD) simulators. It is based on approximating the wave impedance by a rational function over the frequency band of interest. To show the validity of the proposed IBC, the reflection coefficient of a wideband matched 90° H‐plane corner in rectangular waveguide is computed. The results obtained, which are less than −45 dB over the whole waveguide band, are in good agreement with those obtained by a commercial finite‐element simulator. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 151–155, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10400
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