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<p>Open resonators formed by coupling a circular cavity with a top mirror are studied in the 70–80 GHz frequency range. Configurations with spherical and cylindrical top mirrors are considered. It is shown that, under a specific mirror-matching condition, the open-resonator spectrum becomes very sparse and a single mode with a spatially extended RF field distribution is excited over the entire 70–80 GHz band. Such resonators are promising for efficient mode selection in THz gyrotrons and for precise dielectric permittivity measurements.</p>

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Highly Selective Two-Mirror Open Resonators Containing a Circular Cavity

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • E. Khutoryan,
  • I. Kuzmychov,
  • O. Lukash,
  • B. Muzychishin,
  • O. Kuleshov

摘要

Open resonators formed by coupling a circular cavity with a top mirror are studied in the 70–80 GHz frequency range. Configurations with spherical and cylindrical top mirrors are considered. It is shown that, under a specific mirror-matching condition, the open-resonator spectrum becomes very sparse and a single mode with a spatially extended RF field distribution is excited over the entire 70–80 GHz band. Such resonators are promising for efficient mode selection in THz gyrotrons and for precise dielectric permittivity measurements.