National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, No. 2006 Xiyuan Avenue, High-Tech District (West District), Chengdu 611731, China.
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
Sensors (Basel). 2023 May 15;23(10):4762. doi: 10.3390/s23104762.
In this paper, a novel staggered double-segmented grating slow-wave structure (SDSG-SWS) is developed for wide-band high-power submillimeter wave traveling-wave tubes (TWTs). The SDSG-SWS can be considered as a combination of the sine waveguide (SW) SWS and the staggered double-grating (SDG) SWS; that is, it is obtained by introducing the rectangular geometric ridges of the SDG-SWS into the SW-SWS. Thus, the SDSG-SWS has the advantages of the wide operating band, high interaction impedance, low ohmic loss, low reflection, and ease of fabrication. The analysis for high-frequency characteristics shows that, compared with the SW-SWS, the SDSG-SWS has higher interaction impedance when their dispersions are at the same level, while the ohmic loss for the two SWSs remains basically unchanged. Furthermore, the calculation results of beam-wave interaction show that the output power is above 16.4 W for the TWT using the SDSG-SWS in the range of 316 GHz-405 GHz with a maximum power of 32.8 W occurring at 340 GHz, whose corresponding maximum electron efficiency is 2.84%, when the operating voltage is 19.2 kV and the current is 60 mA.
本文提出了一种新颖的交错双分段光栅慢波结构(SDSG-SWS)，用于宽带高功率亚毫米波行波管(TWT)。SDSG-SWS 可以看作是正弦波导(SW) SWS 和交错双光栅(SDG) SWS 的组合;也就是说，它是通过将 SDG-SWS 的矩形几何脊引入 SW-SWS 而得到的。因此，SDSG-SWS 具有工作带宽宽、互作用阻抗高、欧姆损耗低、反射低、易于制造等优点。高频特性分析表明，与 SW-SWS 相比，当它们的色散处于同一水平时，SDSG-SWS 具有更高的互作用阻抗，而两种 SWS 的欧姆损耗基本保持不变。此外，基于电磁场的注波互作用计算结果表明，在工作电压为 19.2kV、电流为 60mA 的情况下，采用 SDSG-SWS 的 TWT 在 316GHz-405GHz 频率范围内输出功率大于 16.4W，在 340GHz 时输出功率最大为 32.8W，对应的最大电子效率为 2.84%。
