Dual-frequency low-voltage subterahertz radial clinotron based on fan-shaped splitter

Abstract

To further improve the output power and tuning bandwidth of compact low-voltage subterahertz vacuum electron devices, a novel dual-frequency low-voltage subterahertz radial clinotron oscillator, in which two fan-shaped radial electron beams transmit inward along the axial direction and interact with two fan-shaped slow wave structures (SWSs) machined on the azimuthally symmetric planar plate individually, is studied in this paper. Compared to the clinotron where the planar SWS composed of the rectangular grooves is adopted, the dispersion curve of proposed fan-shaped radial SWSs is independent of radius and azimuthal coordinates. The particle-in-cell simulation results indicate that the designed clinotron can simultaneously produce the electromagnetic waves at 0.305 THz and 0.34 THz, the corresponding output powers are 9.1 W and 24 W, and the tuning range of bandwidth can be significantly broadened.