超宽带螺旋线行波管的设计

The Design of Ultra-wideband Helix TWT

本文主要介绍了18-40GHz超宽带螺旋线行波管的设计。在设计的过程中,为了提高行波管的输出功率以及电子效率,我们采用了螺距跳变的技术对其进行优化设计。利用三维电磁仿真软件HFSS对螺旋线慢波结构的高频特性进行仿真计算,并用大信号互作用模拟仿真软件对行波管的注-波互作用过程进行模拟,计算结果表明:在18-40GHz的工作频率范围内,行波管的饱和输出功率超过了90W,饱和增益大于35d B,电子效率大于8%,二次谐波比值小于-6d B。

The article mainly introduced the design of ultra-wideband helix TWT within the range of 18 to 40 GHz. In order to improve the output power and electronic efficiency of the traveling wave tube, we adopted the step amplitude of helix pitches technology for optimization in the process of the design. We used 3D electromagnetic simulation software HFSS to simulate the high frequency characteristics of helix slow-wave structure, and simulated the beam-wave interaction by using the large signal interaction simulation software. The results showed that the saturated output power is more than 90 W, saturated gain is greater than 35 d B, electronic efficiency is over 8%, and the second harmonic ratio is below-6d B at frequencies from 18 to 40 GHz.