Design and Simulation of 10-GHz Bandwidth Phase-Velocity Tapers Folded Waveguide for 108-GHz Continuous-Wave Traveling-Wave Tube
Design and Simulation of 10-GHz Bandwidth Phase-Velocity Tapers Folded Waveguide for 108-GHz Continuous-Wave Traveling-Wave Tube
复制标题
用于 108 GHz 连续波行波管的 10 GHz 带宽相速锥形折叠波导的设计和仿真
DOI：
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发表时间：
2021
影响因子：
1.5
通讯作者：
Ou Y
中科院分区：
文献类型：
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作者：
Zhao ZY;Jin ZH;Liu WX;Yang LL;Ou Y
折叠波导行波管（FW）是一种典型的真空电子器件（VED），具有高频、大功率、带宽适中等特点，广泛应用于雷达、通信、电子对抗等领域，在频率超过100 GHz、连续波功率为15 W的海洋通信演示中，设计了工作频率为108 GHz、连续波功率为50 W的行波管。通过详细的理论分析和粒子模拟，对该行波管的色散特性和结构参数进行了优化。为了通过提高输出功率来改善通信质量，采用了一种新的相位速度渐变（PVT）FW慢波结构（SWS）。与传统的FWSWS相比，该方案的输出功率提高了1.5倍。此外，电子束速度的角度和动力学扩展对输出功率的影响首次使用PIC模拟研究。另一方面，为了获得最佳的信号传输，提出了一种锥形和修改的药盒窗口作为传输结构，这是宽带和低衰减的传输特性。在优化参数的帮助下，连续波行波管工作在108 GHz，最大输出功率、增益和带宽分别为78.6 W、31.9 dB和11 GHz。优化结果对连续波行波管的研制具有指导意义。
Folded waveguide (FW) traveling-wave tubes (TWT) is a typical kind of vacuum electron device (VED) with some unique characteristics of high frequency, high power, and moderate bandwidth, which are widely used in radars, communication systems, electronic countermeasure, and so on. For the application to the demonstrations of ocean communication with the frequency of over 100 GHz and continuous-wave power with 15 W, an FWTWT operating at the frequency of 108 GHz and the CW power with 50 W is designed. The optimizations of dispersion characteristics and structural parameters of this FWTWT are optimized through a detailed theoretical analysis and a particle-in-cell (PIC) simulation, respectively. For the improvements of communication quality by the increase of output power, a novel method of phase-velocity tapered (PVT) FW slow wave structure (SWS) is used. Comparing with the conventional FWSWS, the output power with the proposed scheme is enhanced 1.5 times. Moreover, the effects of angle and kinetic spreads of electron beam velocity on output power are first investigated using PIC simulations. On the other hand, for obtaining the optimum signal transmission, a tapered and modified pill-box window is presented and used as the transmission structure, which is the characteristics of the broad bandwidth and low attenuation of transmission. With the help of optimized parameters, the CW FWTWT operates at the frequency of 108 GHz, and the maximum output power, gain, and bandwidth are obtained at 78.6 W, 31.9 dB, and 11 GHz, respectively. The optimum results are beneficial to the development of CW FWTWT.