Design and test of a compact wideband high power microwave source
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摘要: 设计了一款体积紧凑、工作在特高频波段的宽带高功率微波源，系统利用24 V蓄电池供电，Marx 发生器作为驱动源，采用四分之一波长开关振荡器调制产生宽带电磁脉冲，激励高功率微带平板天线辐射，测试结果显示系统工作中心频率为425 MHz，远场辐射场强-距离积峰峰值为91.5 kV@1 m，该微波源体积尺寸为871 mm×370 mm×330 mm，含电池质量小于43 kg，拓展了宽带高功率微波技术在无人机、机器人等平台的应用前景。Abstract: Wideband high power microwave is one of the main development directions of high power microwave in recent years. A wideband high power microwave system with small volume, working in UHF band is developed. The system powered by a 24V battery uses a Marx generator as the driving source. The wideband high power microwave is generated with a quarter wavelength switching oscillator and radiated with a high power microstrip flat plate antenna. The electromagnetic simulation model is established and the key factors are simulated and calculated. The test results show that the center frequency of the wideband high power microwave is 425 MHz, and the peak-to-peak value of the electric field radiation factor is 92kV@1m. The radiation waveform is basically consistent with the simulation results. The application prospect of wideband high power microwave in drone, robot and other platforms is expanded.
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图 2 开关位置和自触发式快前沿Marx发生器结构示意图
Figure 2. Switch position and structure of self-triggering fast Marx generator
图 4 高功率微带平板天线S11参数、方向图及内部电场仿真结果
Figure 4. S11, pattern and internal electric field of the high power microstrip antenna
图 5 四分之一波长开关谐振器与天线失配工作电路原理图
Figure 5. Schematic diagram of the λ/4 switching oscillator with mismatched antenna
图 6 基于环形短路开关和耦合电容器的宽带脉冲调制器结构示意
Figure 6. Structure of wideband pulse modulator based on ring chopping switch and coupling capacitor
图 7 1/4波长开关振荡器电路仿真模型及计算结果
Figure 7. Simulation model and results of the λ/4 switching oscillator
图 9 高功率微波源主要指标测试布局示意图
Figure 9. Test layout for main parameters of high power microwave source
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