[1] [1] MEHDI I,SILES J V,LEE C,et al. THz diode technology:status,prospects,and applications[J]. Proceedings of the IEEE, 2017, 105(6):990-1007. doi:10.1109/JPROC.2017.2650235.

[2] [2] SONG Xubo,LIANG Shixiong,LYU Yuanjie,et al. GaN-based frequencydoublerwith pulsed output power over 1 W at 216 GHz [J]. IEEE Electron Device Letters, 2021,42(12):1739-1742. doi:10.1109/LED.2021.3119391.

[4] [4] YANG Yilin,ZHANG Bo,WANG Yiwei,et al. Development of highpower220GHz frequency triplers based on Schottky diodes[J]. IEEE Access, 2020(8):74401-74412. doi:10.1109/ACCESS.2020.2988454.

[5] [5] DENG Jianqin,YANG Yintang,ZHU Zhangming,et al. A 140~220 GHz balanced doubler with 8.7%~12.7% efficiency[J]. IEEE Microwave and Wireless Components Letters, 2018,28(6):515-517. doi:10.1109/LMWC.2018.2823006.

[6] [6] MORO-MELGAR D, COJOCARI O, OPREA I. High power high efficiency 270~320 GHz source based on discrete Schottky diodes[C]// 2018 The 48th European Microwave Conference(EuMC). Madrid, Spain: IEEE, 2018: 1357-1360. doi: 10.23919/ EuMC.2018.8541364.

[7] [7] SILES J V,COOPER K B,LEE C,et al. A new generation of room-temperature frequency-multiplied sources with up to 10× higher output power in the 160 GHz~1.6 THz range[J]. IEEE Transactions on Terahertz Science and Technology, 2018,8(6):596-604. doi:10.1109/TTHZ.2018.2876620.

[8] [8] HE Yue,LI Li,LIU Ge,et al. A 1 THz Schottky transceiver front-end based on 5 μm GaAs monolithic membrane[J]. Microwave and Optical Technology Letters, 2022,64(12):2143-2150. doi:10.1002/mop.33424.

[9] [9] SILES J V, LEE C, LIN R, et al. A high-power 105~120 GHz broadband on-chip power-combined frequency tripler[J]. IEEE Microwave and Wireless Components Letters, 2015,25(3):157-159. doi:10.1109/LMWC.2015.2390539.

[11] [11] ACST. High-efficiency 200~235 GHz frequency tripler[EB/OL]. [2022-09-22]. https://acst. de/wp-content/uploads/2023/04/ 211005_ACST_200-%E2%80%93-235GHz_Tripler213A_Datasheet_V2.2.pdf. http://opticsjournal.net/Articles/abstract?aid=OJa6daea5af9c57a6d

[12] [12] TIAN Yaoling,HUANG Kun,HE Yue,et al. A novel balanced frequency tripler with improved power capacity for submillimeter-wave application[J]. IEEE Microwave and Wireless Components Letters, 2021,31(8):925-928. doi:10.1109/LMWC.2021.3084622.