The influence of unmatched antenna load on resonance characters of quarter wavelength coaxial oscillator, which determines the output pulse spectrum, was analyzed. Based on cascading dual-port microwave network model, the relationship between load reflectance and the spectrum of output pulse was derived by involving the reflectance of unmatched load into thequivalence coupler reflectance. Numerical simulation of the generator, which contains oscillator, coupler and antenna, was performed,showing consistent results with theoretical predictions. As predicted by theory, the spectrum of the radiation pulse creates two secondary peaks around the major peak, which was also observed in the high power experiment performed.%宽带脉冲产生器的谐振特性决定了产生电磁脉冲的频谱,分析了带耦合器的同轴1/4波长谐振器在负载为非完全匹配天线时,天线反射对谐振特性的影响.通过建立级联二端口微波网络分析模型,将非匹配负载的反射系数计入等效耦合器反射系数中,得到了输出脉冲及辐射场频谱与负载反射系数的关系式.数值模拟了包括谐振器、耦合器和天线在内的整个宽带脉冲辐射系统,得到的辐射场频谱与理论预期相符.由于负载反射的影响,在中心频率两侧产生了两个副峰,在高功率实验中也观察到了该现象.
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