Design and analysis of moderate band radiation system based on differential switched oscillator
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摘要: 设计了一种差分开关振荡器，能够产生中心频率300 MHz的差分衰减振荡信号，并研制了基于差分开关振荡器和螺旋天线的辐射系统。首先将相同中心频率的差分开关振荡器与单端开关振荡器对比，表明差分开关振荡器的耐压和输出电压是单端开关振荡器的两倍；然后介绍了差分开关振荡器的设计方案，对其阻抗特性和静电场分布进行了分析，仿真了其瞬态工作过程；之后根据差分开关振荡器的输出形式，研制了一种差分注入的螺旋天线，作为系统的辐射天线；最后介绍了该差分型辐射系统在不同辐射距离，不同充气气压下的实验结果，并与单端型辐射系统进行了对比。结果表明，该辐射系统能够产生中心频率300 MHz，百分比带宽约20%的高功率宽带电磁脉冲，最大辐射场强约18 kV/m，有效电势约110 kV，场强与单端型辐射系统相比近似提高了1倍。Abstract: A new differential switched oscillator is designed to generate a differential damped sinusoidal signal with a center frequency of 300 MHz. Besides, a radiation system based on a differential switched oscillator and associated helical antenna is designed and analyzed. Firstly, the differential switched oscillator with the same central frequency is compared with the single-ended switched oscillator, which shows that the withstand voltage and output voltage of the differential switched oscillator are twice that of the single-ended switched oscillator. Secondly, the design of a differential switched oscillator is introduced. The characteristic impedance and the static electric field distribution of the oscillator are analyzed. The transient performance of the oscillator is simulated. Thirdly, a differential helical antenna is designed as the radiation antenna, in order to match the output form of the differential switched oscillator. Finally, the experimental result with different nitrogen pressure at different radiation distances is introduced. The radiation systems based on single-ended switched oscillator and differential switched oscillator are compared. It is shown that the radiation system can generate a high power mesoband EMP with a center frequency of 300 MHz and a percent bandwidth of about 20%. The maximum intensity of electric field is about 18 kV/m and the radiation factor is about 110 kV. The electric field intensity of the differential radiation system is twice that of the single-ended radiation system.
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图 3 差分开关振荡器特征阻抗分布
Figure 3. Characteristic varistion distribution of the radial transmission line
图 4 差分开关振荡器静态电场分布
Figure 4. Static electric field distribution inside the differential switched oscillator
图 10 基于差分开关振荡器的高功率宽带电磁脉冲辐射系统
Figure 10. High power mesoband radiation system based on differential switched oscillator
图 11 不同距离处辐射场波形
Figure 11. Waveform of the radiated electric field at different distances
图 13 不同充气气压下辐射场博波形
Figure 13. Waveform of the radiated electric field with different nitrogen pressure
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