Quadruple Folded Groove-Guide Slow Wave Structure With Power Synthesis Circuit for Terahertz TWT

In this letter, a novel power synthesis scheme is proposed for high-power terahertz (THz) traveling-wave tube (TWT), which features a quadruple folded groove-guide (Q-FGG) slow wave structure (SWS) and a power synthesis circuit. Numerical simulations validate the high-frequency characteristics of Q-FGG-SWS. Particle-In-Cell (PIC) simulations predict that, driven by four 125mA electron beams at 28.4kV, the Q-FGG-TWT is expected to achieve possibility of output power of approximately 177.3W at 316GHz. The Q-FGG-SWSs were fabricated using high-precision computer numerical control (CNC) milling technology. The dispersion characteristics of Q-FGG-SWS and transmission characteristics of the Q-FGG-SWSs based on the compact multi-stage groove-T coupler were experimentally verified. Therefore, the Q-FGG-SWS with a compact power synthesis circuit offers a promising approach for enhancing the power output of THz-TWTs.