设计了一个基于交错双光栅的双路并联慢波结构，该结构采用两注电子及均匀恒磁场聚焦系统，具有平面二维结构。对该慢波结构的色散等冷测特性进行了详细研究，采用功分器和传输变换结构构成高频互作用电路，输出口为WR-2.8 标准波导口，在305 GHz~335 GHz 获得较好的传输特性，反射系数S ₁₁＜?15 dB，传输系数S ₂₁＞?4.4 dB。利用三维粒子模拟计算的方法，分析比较了单路及双路行波管放大特性。在电流密度53.57 A/cm² 情况下增益达到14.586 dB，是一种极具发展潜力的太赫兹器件。

A novel slow wave structure with dual-gratings in parallel based on staggered double channels is proposed. The structure formed by double beams and a focusing system has a two-dimensional structure. Dispersion characteristics of slow-wave structure are simulated and analyzed in detail. The high frequency structure consists of power dividers and transmissions, and its output ports are standard waveguide named WR-2.8. The transmission losses of the whole RF structure S ₂₁＞?4.4 dB and the reflection parameter S ₁₁＜?15 dB are achieved. The beam-wave interaction properties of single channel and double channels are also simulated, and the gain can reach 14.586 dB with a current density of 53.57 A/cm². Because of lower current density and simple structure, the RF system shows the application potential for terahertz Traveling Wave Tube(TWT).