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Advances in Radio Science An open-access journal of the U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V.
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Volume 6
Adv. Radio Sci., 6, 9–17, 2008
https://doi.org/10.5194/ars-6-9-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Adv. Radio Sci., 6, 9–17, 2008
https://doi.org/10.5194/ars-6-9-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  26 May 2008

26 May 2008

Compact mode-matched excitation structures for radar distance measurements in overmoded circular waveguides

G. Armbrecht1, E. Denicke1, I. Rolfes1, N. Pohl2, T. Musch3, and B. Schiek3 G. Armbrecht et al.
  • 1Inst. für Hochfrequenztechnik und Funksysteme, Leibniz Universität Hannover, Appelstraße 9A, 30167 Hannover, Germany
  • 2Lehrstuhl für Integrierte Systeme, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
  • 3Institut für Hochfrequenztechnik, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany

Abstract. This contribution deals with guided radar level measurements of liquid materials in large metal tubes, so-called stilling wells, bypass or still pipes. In the RF domain these tubes function as overmoded circular waveguides and mode-matched excitation structures like waveguide tapers are needed to avoid higher order waveguide modes. Especially for high-precision radar measurements the multimode propagation effects need to be minimized to achieve submillimeter accuracy. Therefore, a still pipe simulator is introduced with the purpose to fundamentally analyze the modal effects. Furthermore, a generalized design criterion is derived for the spurious mode suppression of compact circular waveguide transitions under the constraint of specified accuracy levels. According to the obtained results, a promising waveguide taper concept will finally be presented.

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