【摘要】 采用矩形波导加载光栅的慢波结构作为太赫兹返波管的高频结构,通过理论分析和电磁仿真研究了该慢波结构的色散特性和互作用阻抗,理论分析结果和仿真结果能很好地吻合.在理论分析的基础上,设计了一个中心频率为340 GHz的返波管,经粒子模拟软件计算,在较低电流密度的情况下该返波管输出功率达100mW且可调带宽约30 GHz.更多还原

【Abstract】 A slow-wave structure( SWS) composed of a grating inside a rectangular waveguide is adopted as the circuit of the backward wave oscillator( BWO) in terahertz regime in this paper. Its dispersion curves and interaction impedance are presented by an analytical method and three-dimensional( 3-D) electromagnetic software. The results by analysis and simulation agree well. By optimization,a BWO with the SWS at a central frequency 340 GHz is fully verified by 3-D particle-in-cell( PIC) code. The BWO is demonstrated with more than 100 mW output power at very low current density and 30 GHz tuning bandwidth.更多还原