Demonstration of a High-Power and Wide-Bandwidth G-Band Traveling Wave Tube With Cascade Amplification
Wenxin Liu, Zhiqiang Zhang, Weihao Liu, Zhihao Jin, Kedong Zhao, Chao Zhao, Xin Guo, Zhaochuan Zhang, Shengyi Yin, Zhenxia Zhang
Abstract
We propose and experimentally demonstrate a high-power and wide-bandwidth terahertz travelling wave tube (TWT), which is with two cascade amplification sections: the output wave of the first TWT is used as the input of the second one. Using a 17 kV, 71 mA electron beam, the measured peak power is over 60 watt and the average output power is over 12 watts with 20% duty cycle at the frequency around 0.22 THz. The gain is about 30 dB and the bandwidth is over 6 GHz. The average power-bandwidth-gain product reaches record high in the designed spectral range. We envisage that this new developed terahertz TWT will have broad application prospects, such as in long-range radar and communication systems.