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利用粒子模拟技术对Ka波段耦合腔行波管的非线性互作用现象进行了研究。互作用电路采用的是重入式双交错梯形线耦合腔慢波结构,设计了匹配良好的高频耦合系统,并建立了一个基于CPI的Ka波段耦合腔行波管的三维电路模型。粒子模拟结果表明,当采用和CPI管子相同的电气参数和色散特性时,该管能在28.3~30 GHz的频率范围内有大于550 W的饱和平均输出功率,瞬时带宽大于600 MHz,相应的饱和增益和电子效率分别大于33 dB和8.39%。上述结果与CPI的测试结果吻合良好,证明了设计方案的可行性以及粒子模拟能较准确地对耦合腔行波管的工作性能进行估计。
The phenomenon of nonlinear interaction of traveling wave tubes in a Ka-band coupled cavity was studied by means of particle simulation. The interaction circuit adopts a double-staggered trapezoidal line coupled cavity slow-wave structure, and a well-matched high-frequency coupling system is designed. A three-dimensional circuit model of a Ka-band coupled cavity TWT based on CPI is also established. The particle simulation results show that the tube can have a saturated average output power of more than 550 W at a frequency range of 28.3 to 30 GHz and an instantaneous bandwidth of more than 600 MHz when using the same electrical parameters and dispersion characteristics as the CPI tube. The corresponding saturation Gain and electronic efficiency are greater than 33 dB and 8.39% respectively. The above results are in good agreement with the CPI test results. It proves that the feasibility of the design scheme and the particle simulation can accurately estimate the working performance of the coupled cavity TWT.