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中文摘要：
翼片加载折叠波导电路是一种改进型的行波管互作用电路。与原始结构相比,它具有提高的耦合阻抗、扩展的横向尺寸以及更加灵活的设计能力,因此适合工作在太赫兹频段。首先采用理论模型设计了工作频率0.22THz的慢波结构;然后采用三维粒子模拟技术对翼片加载折叠波导行波管放大器的非线性性能进行了研究。结果显示,新型结构具有高的互作用效率和宽频带放大的能力。在中心工作频率220GHz处,2mW的驱动功率下可以得到4W的饱和输出功率,对应的电子效率和增益分别为2.47%和33dB（考虑了电路的导体损耗）;恒定功率下扫频模拟显示,放大器的瞬时3dB带宽可达13.6,频率范围覆盖205～235GHz。
英文摘要：
The vane-loaded folded waveguide slow-wave circuit is an improved TWT interaction circuit. It offers advantages in increasing interaction impedance, extending transverse dimension and flexible design capacity. Thus such a circuit is especially suitable for THz applications. In this paper the slow-wave circuit operating at 0.22 THz band is designed based on theoretical model. Then the PIC simulations were used to investigate the nonlinear performance of the travelling-wave tube amplifier. Simulation results show that the novel circuit is capable of wideband amplification with high interaction efficiency. At the center frequency of 220 GHz, a saturated output value of 4 W of can be achieved with an input power of 2 mW. The corresponding electron efficiency and gain are respectively 2. 47% and 33 dB. Simulations of sweep frequency with constant input power show that the instantaneous 3 dB bandwidth can be up to 13.6%, covering frequency range 205-235 GHz.
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