Beam waveguide reflector with integrated direction-finding antenna for in-situ alignment

W. Kasparek, H. Idei, S. Kubo, T. Notake

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


An in-situ alignment system for beam waveguides based on an interferometric direction-finding antenna was investigated numerically and experimentally. The system consists of a reflector with four off-central positioned waveguide couplers in two directions. By nulling the difference of the power signals as well as the mixing signal from each coupler pair, spatial and angular alignments of a beam impinging on the mirror can be performed. In this paper, the characteristics of such a mirror are presented, and the design of a prototype intended for use in an ECH transmission line at LHD is described. Low-power as well as high-power tests at a frequency of 82.7 GHz were carried out, and the results are discussed. The device shows a high performance in agreement with theory.

Original languageEnglish
Pages (from-to)451-472
Number of pages22
JournalInternational Journal of Infrared and Millimeter Waves
Issue number4
Publication statusPublished - Apr 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering


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