S波段大功率固态放大器及径向波导功率合成器研究

【作者】 李良朝；

【导师】 李家胤；

【作者基本信息】 电子科技大学 ， 电子科学与技术， 2007， 硕士

【摘要】 本论文重点研制千瓦级S波段高功率微波固态功率放大器系统，工作频率2.0～2.3GHz，通过径向波导合成器合成6路200W固态功率放大器模块输出1KW功率。为实现该固态功率源，本论文对高功率微波固态功放的关键技术如宽带匹配技术、功率合成技术进行了讨论分析；对千瓦级微波固态放大器控制系统做出了详细的分析，给出了测量驻波、增益、温度、电流、功率等的电路图，设计了基于DSP的控制系统，为千瓦级系统成功构建打下坚实基础；利用场匹配理论推导了径向波导功率合成器的场表达式，导出了散射系数的矩阵方程，导出了导纳表达式，通过导纳转换即可获得S参数，为利用Matlab编程计算反射系数、传输系数、隔离度等奠定了基础；采用理论分析与仿真软件相结合的方法，设计出一个基于径向波导的功率合成器，CST软件仿真结果表明该合成器在驻波比小于1.1情况下，工作频率1.3～3.3GHz，合成效率达到96％，隔离度优于-6dB，功率容量1.5KW左右；调试了200W功率放大器，调试结果表明该放大器工作频率为2.0～2.3GHz，增益达到(14.2±0.5)dB，饱和输出功率达200W，最大功率附加效率达60％；加工测试了一个6路径向波导功率合成器，测试结果表明该合成器与仿真结果比较吻合，下一步改进加工工艺、减小装配误差后可以用于合成6路200W固态功率模块。更多还原

【Abstract】 We place emphasis on KW class S-band high power SSPA design in this thesis, Thefrenquency is from 2.0 to 2.3GHz, the output power is 1KW through combining six200W PA modules by a 6-way radial-waveguide power combiner.The main work is following: we have studied some key issues such as wide-bandmatching and high power combining techniques to implement S-band hectowatt-levelCW SSPA; we also designed control-circuit for 200 watt PA module using DSP,provided the circuit measuring VSWR, Gain, temperature, current, power and so on; wealso place emphasis on KW S-band high power radial-waveguide power combiner, wehave analyzed the fields in the cavity with one central probe and N equispaced identicalperipheral probes; through theoretical analysis and simulation, we have designed aradial-waveguide power combiner, the CST simulation results show that this combinerachieves broad operating band, which cover 1.3-3.3GHz, with a VSWR less than 1.1across the passband, a high combining efficiency reaches 96％, and a isolation greaterthan -6dB; the tuning result shows the designed 200 Watt final-stage PA has a PldB oflarger than 52dBm, associated with a PAE of 45％in the 2.0 to 2.3GHz frequency band.In the small signal condition, PA gain is (14.2±0.5) dB, saturation output power is up to200W with a efficiency of 60％.更多还原