Dielectric-supported Rhombus-shaped Meander-line Slow-wave Structure for a V-band Dual-sheet Beam Traveling Wave Tube

Abstract

A novel dual-beam rhombus-shaped meander line slow wave structure (DS-RSML SWS) is proposed in this paper, which is suitable for low-voltage operation and device miniaturization. The planar SWS is supported by two dielectric rods from both sides, making it suitable for dual-beam operation. The high frequency and transmission characteristics of the SWS are investigated. The input-output couplers connect the SWS with the standard waveguide by adopting step waveguide. The backward-wave oscillation is effectively suppressed by negative pitch tapering. Particle-in-cell (PIC) simulation results show that the output power of the rhombus-shaped SWS can reach 83 W at 58 GHz, under the conditions of a dual-sheet beam (7.7kV, 0.1 A) and input power of 0.1 W, with gain and electron efficiency of 29 dB and 10.8%, respectively.