Extension of steering angle in a square corrugated waveguide antenna

K. Ohkubo, S. Kubo, T. Shimozuma, H. Idei, Y. Yoshimura, T. Notake, W. Kasparek

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


A theoretical study of the square waveguide antenna with corrugated walls was carried out with reference to experimental results. When the length of the waveguide, to which the Gaussian beam is injected obliquely, is changed, a recursive Gaussian beam with high efficiency radiates from the waveguide exit in the asymmetric or symmetric direction with respect to a waveguide axis at almost the same interval. Because the optimum waveguide length for maximum efficiency decreases stepwise with increasing injection angle, adjustment of the waveguide length is not continuous but discrete. This method enables the injection angle, which is limited to 10° in a fixed waveguide length, to be increased by about two times. This is applicable to an antenna for an ITER-electron cyclotron heating/current drive and also to a launcher for a small machine with a narrow port where a steering mirror cannot be installed.

Original languageEnglish
Pages (from-to)657-672
Number of pages16
JournalFusion Engineering and Design
Issue number4
Publication statusPublished - Jul 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering


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