A Sub-THz High-Order Mode Backward Wave Oscillator Driven by Pseudospark Sourced Multiple Sheet Electron Beams

• Published in: IEEE transactions on electron devices Vol. 69; no. 9; pp. 5216 - 5222
• Main Authors: Shu, Guoxiang, Liao, Jiacai, He, Jingcong, Ren, Junchen, Lin, Jujian, Lin, Guangxin, Li, Qi, Ruan, Cunjun, He, Wenlong
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Backward wave oscillator (BWO); Backward waves; Circuit design; Conductors; Couplings; Dispersion; Electron beams; high-order mode (HOM); Integrated circuit modeling; Oscillators; Permittivity; Plasmas; pseudospark (PS)-sourced multiple-sheet-electron-beams; terahertz radiation; Wave interaction
• ISSN: 0018-9383; 1557-9646
• DOI: 10.1109/TED.2022.3190259

A novel concept of combining the advantages of pseudospark (PS)-sourced electron beam (high beam current density), multiple-sheet-electron-beams (large total beam cross-sectional area), and high-order mode (HOM) slow wave structure (SWS) (high power capacity) to produce high-power terahertz signals is presented in this article. As an example, a sub-terahertz backward wave oscillator (BEO) driven by PS-sourced dual-sheet-electron-beams is designed. Measured results of the interaction circuit, including transmission/reflection coefficients and the dispersion relation, were in good agreement with simulation predictions. Beam-wave interaction simulations having considered the plasma effect and conductor loss predicted stable output signals with radiation power of 167.4-255.4 W over a tunable bandwidth of 234.4-241.0 GHz.