Achieving Ultra-Wide Band Operation of the High-Power Sheet Beam TWT by Using Novel Double-Ridge Staggered Vane Structure

To break limitation in the bandwidth of traditional SB-TWTs at high power of its operation, an innovative Double-Ridge Staggered Vane (DRSV) Structure is proposed and verified as an effective solution for ultra-wideband high-power TWT in the millimeter wave and terahertz. DRSV is based on the staggered double-vane slow-wave structure (SDV-SWS) and introduces side slots on both sides, which changes the circuit characteristics. This novel SWS allows for a significant expansion in operating bandwidth while maintaining high power output. In addition, combined with an all-period phase velocity tapering optimization method, the bandwidth and efficiency can be further improved.The ultra-wideband amplification characteristics were verified using particle in-cell (PIC) simulations at Ka-band. Additionally, experimental validation was performed on the dispersion properties. The results demonstrate that the 3-dB bandwidth surpasses 13.5 GHz, ranging from 20 to 33.5 GHz, corresponding to a relative bandwidth of 50.5%.