Rectangular dielectric waveguide and its optimal transition to a metal waveguide

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Doctoral thesis (article-based)
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Helsinki University of Technology Radio Laboratory publications. Report S, 254
The purpose of this work was to study the rectangular dielectric waveguide and its transitions to metal waveguide at millimeter wavelengths. The thesis reviews different dielectric waveguiding structures, their analysis methods and their transitions to the metal waveguide. In this thesis work the analysis methods and transitions are further developed. The main results of this work are: It was shown that, after modifications, the Marcatili and Goell methods can be applied for calculating propagation constants of rectangular dielectric waveguide made of uniaxial anisotropic material with the optical axis oriented along the dielectric waveguide. Several tapering shapes were studied. It was shown that symmetrical E-tapering gives lower insertion losses and smaller reflections compared with the H-tapering. Different cross-sections and geometry of tapering were studied using Agilent HFSS program. The most appropriate dimensions were found. In the case of unsymmetrical tapering it was shown that better results are achieved when the axes of metal and dielectric waveguides do not coincide but differ by half of the tapering angle. Low insertion loss and small reflections were obtained with sapphire waveguide section. For a 100 mm sapphire waveguide section lower losses were obtained than for a 100 mm standard metal waveguide section. Characteristics of a dielectric rod antenna were measured.
dielectric waveguide, transition, millimeter wave, low-loss
Other note
  • V.V. Meriakri, M.P. Parkhomenko, S.N. Dudorov, Millimeter wave dielectric strip waveguides made of ferrites, and devices based on these waveguides, Proceedings of the XXVIII Moscow International Conference on Antenna Theory and Technology, 22-24 September, 1998, Moscow, pp. 493-495.
  • D. Lioubtchenko, S. Dudorov, J. Mallat, J. Tuovinen, A.V. Räisänen, Low Loss Sapphire Waveguides for 75-110 GHz Frequency Range, IEEE Microwave and Wireless Components Letters, vol. 11, no. 6, 2001, pp. 252-254.
  • S.N. Dudorov, D.V. Lioubtchenko, A.V. Räisänen, Modification of Marcatili's method for the calculation of anisotropic rectangular dielectric waveguides, IEEE Trans. on Microwave Theory and Techniques, vol. 50, no. 6, 2002.
  • S.N. Dudorov, D.V. Lioubtchenko, J.A. Mallat, A.V. Räisänen, Modified Goell method for the calculation of uniaxial anisotropic rectangular dielectric waveguides, Microwave and Optical Technology Letters, vol. 32, no. 5, 2002, pp. 373-376.
  • D.V. Lioubchenko, S.N. Dudorov, A.V. Räisänen. Development of rectangular open dielectric waveguide sections for the frequency range of 75-110 GHz, 31st European Microwave Conference, London 2001, pp. 201-204.
  • S. Dudorov, D. Lioubtchenko, J. Mallat, J. Tuovinen, A.V. Räisänen, Low loss dielectric waveguides at 75-110 GHz frequency range, Abstracts of the URSI XXV National Convention on Radio Science, Helsinki, Finland, September 2000, pp. 40-41.
  • S. Dudorov, D. Lioubtchenko, J. Mallat, A.V. Räisänen, Sapphire dielectric waveguide antenna, URSI XXVI National Convention on Radio Science, Tampere, Finland, October 2001, pp. 127-128.
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