[4] [4] YAO Shisen, CHENG Yujian, BAI Hang, et al. W-band high-efficiency waveguide slot array antenna with low sidelobe levels based on silicon micromachining technology[J]. Chinese Journal of Electronics, 2022, 31(4): 665-673. doi: 10.1049/cje. 2020. 00.315.

[5] [5] ZHANG Xiaoqing, FENG Jinjun, CAI Jun, et al. Power enhancement in W-band pulsed folded waveguide TWT[J]. IEEE Transactions on Electron Devices, 2021,68(5):2504-2508. doi:10.1109/TED.2021.3068692.

[6] [6] ZHANG Xiaoqing,FENG Jinjun,CAI Jun,et al. High-efficiency W-band pulsed TWT with three-stage depressed collector[J]. IEEE Microwave and Wireless Components Letters, 2022,32(2):121-124. doi:10.1109/LMWC.2021.3122124.

[7] [7] DU Yinghua,CAI Jun,ZHANG Xiaoqing,et al. A substantially lowered-voltage high-power W-band pulsed traveling wave tube[J]. IEEE Microwave and Wireless Components Letters, 2021,31(6):590-592. doi:10.1109/LMWC.2021.3070637.

[8] [8] COOK A M,WRIGHT E L,NGUYEN K T,et al. Demonstration of a W-band traveling-wave tube power amplifier with 10 GHz bandwidth[J]. IEEE Transactions on Electron Devices, 2021,68(5):2492-2498. doi:10.1109/TED.2021.3068926.

[9] [9] KOWALCZYK R,ZUBYK A,MEADOWS C,et al. A 100 W W-band MPM TWT[C]// 2013 IEEE The 14th International Vacuum Electronics Conference(IVEC). Paris,France:IEEE, 2013:1-2. doi:10.1109/IVEC.2013.6571123.

[10] [10] CHEN Ji,WANG Zhigang,WANG Fengyan,et al. Demonstration of a broadband W-band microwave power module with improved gain flatness[J]. IEEE Electron Device Letters, 2022,43(8):1335-1338. doi:10.1109/LED.2022.3185157.

[11] [11] CAI Jun,FENG Jinjun,WU Xianping. Folded waveguide slow wave structure with modified circular bends[J]. IEEE Transactions on Electron Devices, 2014,61(10):3534-3538. doi:10.1109/TED.2014.2349651.