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 应用科技  2018, Vol. 45 Issue (2): 34-37  DOI: 10.11991/yykj.201705005 0

### 引用本文

WEI Yu, CHEN Xiaojie, LIU Zhenlong, et al. Synthesis of coherent power of microwave magnetrons based on two-way 15 kW continuous wave[J]. Applied Science and Technology, 2018, 45(2), 34-37. DOI: 10.11991/yykj.201705005.

### 基金项目

973计划项目(2013CB328902)

### 文章历史

Synthesis of coherent power of microwave magnetrons based on two-way 15 kW continuous wave
WEI Yu, CHEN Xiaojie, LIU Zhenlong, LIU Changjun
School of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
Abstract: It is necessary to overcome the phase drift existing when the injection frequency locking magnetron works in order to improve the synthesis efficiency of coherent powers of large-power microwave magnetrons and realize a long-term stable output. On basis of LabVIEW, the closed-loop phase control on the coherent power synthesis system of two-way S-waveband 15 kW injection frequency locking magnetrons was realized. By carrying out the phase control with 1.8 degrees of phase shift precision for the injection frequency locking magnetrons, the maximum efficiency of the coherent power synthesis can reach 93.6%, in addition, the stability of the coherent power synthesis system can be assured. The closed-loop phase control based on LabVIEW is a key technology for the coherent power synthesis system of a microwave magnetron to obtain large power and high efficiency, it is able to promote the application of injection frequency locking magnetron in the field of microwave energy.
Key words: microwave magnetron    coherent power synthesis    phase controlling    injection frequency locking    virtual instrument technology    microwave energy    synthesis efficiency    LabVIEW

1 注入锁频磁控管系统

S波段15 kW注入锁频磁控管如图1所示，注入锁频磁控管可以看作一个整体，是在普通磁控管的基础上加入注入锁频模块来改善磁控管的输出特性。注入锁频磁控管由两部分组成：功率输出部分（矩形框所示）当开启高压直流电源后磁控管正常起振，其阳极电压达到12.5 kV，阳极电流达到2.2 A，输出微波功率达到15 kW左右，经四端口环行器和双定向耦合器后被大功率水负载吸收。注入锁频部分（圆角矩形框所示）通过外部固态信号源产生稳定且与磁控管自由振荡频率相近的微波信号，经功率放大器和环行器注入到磁控管内部，注入信号会将磁控管的输出频率牵引至注入信号的频率，输出微波的相位与注入信号的相位差保持恒定，从而实现对磁控管注入锁相[4]

2 两路注入锁频磁控管相干功率合成

 $\eta = \frac{{{P_{ out}}}}{{{P_1} + {P_2}}} = \frac{{{k^2} + 2k\cos \Delta \theta + 1}}{{2{k^2} + 2}}$

 $\eta = \left( {\frac{k}{{{k^2} + 1}} + \frac{1}{2}} \right) \times 100\%$

 $\eta = \left( {\frac{1}{2}\cos \Delta \theta + \frac{1}{2}} \right) \times 100\%$

3 LabVIEW平台下控制磁控管移相

4 相干功率合成的实验验证