A W-band folded waveguide traveling wave tube (FWTWT) with lowered 19.4-kV operation voltage and improved gain flatness was investigated and developed. In this article, design methodology, fabrication, and test results were presented and discussed. Two kinds of slow-wave circuits with the positive and negative period stepping were chosen to carry out the contrastive study. A folded waveguide automatic measurement code was independently developed, and the FWTWT was fabricated by LIGA method. The test results showed that a saturated output power was greater than 87 W in the frequency range of 93–100 GHz and greater than 102 W in the frequency range of 95–98.3 GHz with the maximum output power of 123 W at 96.9 GHz. Within the frequency range of 93–100 GHz, saturated gains were higher than 30.05 dB, and gain fluctuation was 3.47 dB with the maximum gain of 33.52 dB at 96.9 GHz. The maximum electronic efficiency of 7.04% and the maximum total efficiency of 13.52% were obtained.

中文翻译：

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开发工作电压更低、增益平坦度更高的W波段折叠波导TWT

研究和开发了一种具有降低的 19.4 kV 工作电压和改进的增益平坦度的 W 波段折叠波导行波管 (FWTWT)。在本文中，介绍并讨论了设计方法、制造和测试结果。选取正负周期步进两种慢波电路进行对比研究。自主开发折叠波导自动测量程序，采用LIGA法制作FWTWT。测试结果表明，93-100 GHz频率范围内饱和输出功率大于87 W，95-98.3 GHz频率范围内饱和输出功率大于102 W，96.9 GHz时最大输出功率为123 W。在 93-100 GHz 频率范围内，饱和增益高于 30.05 dB，增益波动为 3。47 dB，在 96.9 GHz 时最大增益为 33.52 dB。获得了7.04%的最大电子效率和13.52%的最大总效率。