In this article, design of a high-order-mode (TE ₂₀ -mode) staggered double vane (SDV) traveling wave tube amplifier (TWTA) with two pencil electron beams is presented. Since, the dimensions are larger when compared to fundamental mode TWTAs, the high-power capacity can be achieved. Meanwhile, several ways to suppress the fundamental mode competition and improve the stability of our high-order-mode TWTA are studied thoroughly, such as limiting the gain of each stage and using metal or wave-absorbing material columns. A three-stage TE ₂₀ -mode SDV TWTA with aluminum nitride column at the center of vanes is simulated to get an over 145-W peak power with a corresponding gain of 32.5 dB. The frequency spectrum is pure at 220 GHz and the output signal is a stable TE ₂₀ -mode signal. The bandwidth reaches about 38 GHz. The results show that high-order-mode operation can develop the high-power capacity vacuum electron devices at terahertz band.

中文翻译：

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高阶模态交错双叶片行波管的设计与稳定性分析，该管具有两根G波段铅笔梁

在本文中，介绍了 具有两个笔形电子束的高阶模式（TE ₂₀模式）交错双叶片 (SDV) 行波管放大器 (TWTA) 的设计。由于与基模 TWTA 相比尺寸更大，因此可以实现高功率容量。同时，深入研究了几种抑制基模竞争和提高高阶模TWTA稳定性的方法，例如限制各级增益和使用金属或吸波材料柱。 模拟了在叶片中心具有氮化铝柱的三级 TE ₂₀模式 SDV TWTA，以获得超过 145 W 的峰值功率，相应的增益为 32.5 dB。频谱在 220 GHz 时纯净，输出信号为稳定的 TE ₂₀ -模式信号。带宽达到约 38 GHz。结果表明，高阶模式操作可以开发出太赫兹波段的高功率容量真空电子器件。