Ka波段双注折叠波导行波管的研究  

Improvements of Two-Beam Ka Band Folded Waveguide of Traveling Wave Tube

作　　者：王书见[1,2] 薛谦忠[1] 王自成[1] 张世昌[1] 郭际[1,2] 

机构地区：[1]中国科学院电子学研究所中国科学院高功率微波源与技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《真空科学与技术学报》2014年第1期43-48,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：分析了单注折叠波导行波管增益和带宽的限制因素，提出了采用双注结构提高单位长度增益和拓宽带宽的方法。模拟结果表明，在工作电压和单注电流相同的情况下，采用同速双注（两电子注速度相同）可将高频互作用系统饱和输出功率提升至单注时的2．8倍，互作用效率提高了1．4倍，增益饱和长度缩短了5个几何周期；采用非同速双注可在更宽的频率范围内满足同步条件，展宽了带宽。设计了一工作频率为25～29．5GHz的宽带折叠波导行波管，3dB增益带宽可达到16．5％，约占冷带宽（12GHz，22—34GHz）的38％，输出功率在27GHz时达到最大为256W。另外，文中对由电路内部反射引起的增益不稳定性进行了分析，并给出了解决方法。A novel type of the two-beam Ka band folded waveguide of traveling wave tube（TWT）was developed to effectively relax the limitations on the gain and bandwidth. The conventional and newly-developed folded waveguide were modeled and simulated. The simulated results show that the two-beam folded waveguide outperforms the single beam fold- ed waveguide in several ways. For example,an increase of the saturated power of high-frequency interaction by 2.8 times, an increase of the interaction efficiency by 1.4 times, and a reduction of the saturation length by 5 geometrical periods. Besides,the two beams at different speeds are capable of widening the synchronization frequency range,significantly eas- ing the limitation on the bandwidth. We found that the saturated radiation power reached 256 W at 27 GHz. The 3 dB in- stantaneons bandwidth was 16.5% ,covering the 25 - 29.5 GHz range. The possible ways to remove the negative effects of the internal reflection on instability of gain were tentatively discussed.

关 键 词：双注折叠波导行波管 归一化相速度 耦合阻抗 增益不稳定性 

分 类 号：TN814[电子电信—信息与通信工程]