A Highly Overmoded Structure for Hundred-Kilowatt-Class <italic>Ka</italic>-Band Extended Interaction Klystron

Yifan Zu, Xuesong Yuan, Xiaotao Xu, Hailong Li, Qingyun Chen, Matthew Thomas Cole, Lin Meng, Yang Yan

Research output: Contribution to journalArticlepeer-review

32 Downloads (Pure)


Here, we report on the development of highly overmoded structure for a millimeter-wave (MMW) extended interaction klystron (EIK). To enhance electron beam loading, a new method for designing an oversized beam tunnel in a large cavity by concentrating the axial field is demonstrated. The transmission and oscillation characteristics of the interaction circuit operating in the quasi-TM04 mode are tested by the developed mode conversion circuit. Results suggest that a five-cavity EIK based on this highly overmoded structure can achieve an output power of 289 kW at 32.92 GHz with a saturated gain of 51.6 dB by injecting a 3.3-mm-diameter electron beam with a current of 18 A. The output power exceeds 100 kW at a bandwidth of 100 MHz.

Original languageEnglish
Number of pages7
JournalIEEE Transactions on Electron Devices
Early online date29 Aug 2023
Publication statusPublished - 14 Sept 2023


  • Circular waveguides
  • Couplings
  • Electric fields
  • Electromagnetic waveguides
  • Electron beams
  • Extended interaction klystron (EIK)
  • highly overmoded structure
  • Ka-band
  • Periodic structures
  • Rectangular waveguides
  • vacuum electronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


Dive into the research topics of 'A Highly Overmoded Structure for Hundred-Kilowatt-Class <italic>Ka</italic>-Band Extended Interaction Klystron'. Together they form a unique fingerprint.

Cite this