利用相对论返波管 (RBWO)产生纳秒脉宽、千瓦量级功率的太赫兹脉冲辐射对太赫兹技术的应用具有积极意义。本文对 0.34 THz-RBWO进行了粒子模拟与设计，通过微精密加工得到了平均直径 6.8 mm，波纹深度 0.1 mm，周期 0.26 mm的正弦周期慢波结构，并对 0.34 THz-RBWO进行了初步的实验。文中对 0.34 THz脉冲信号脉宽、频率、功率参数的测量原理进行了研究。通过初步实验测试，0.34 THz-RBWO辐射波脉冲宽度 2.1 ns，频率范围 0.32 THz~0.36 THz，功率为 375 kW。

Terahertz pulse radiation with nanosecond width and kilowatt level power generated by Relativistic Backward-Wave Oscillator(RBWO) has positive significance in terahertz technology applications. The particle simulation and design of a 0.34 THz-RBWO is presented. The sinusoidal period slow wave structure with an average diameter of 6.8 mm, a corrugation depth of 0.1 mm, a period of 0.26 mm is manufactured by fine fabrication processes, and the preliminary experiment of the 0.34 THz-RBWO is performed. The principles of measurement on signal width, frequency, power of 0.34 THz pulse are studied. The 0.34 THz-RBWO pulse radiation with a pulse width of 2.1 ns, a frequency range of 0.32 THz-0.36 THz, and a power of 375 kW is measured through the preliminary experiment.