可调频高功率宽谱微波的产生和辐射
A frequency-tunable wideband high-power-microwave radiation system
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摘要: 设计了一种可调谐频率的高功率宽谱微波辐射装置，装置由可调谐长度的1/4波长低阻同轴谐振器、环形开关、电容耦合器和宽谱辐射天线组成，中心频率调谐为200～400 MHz。低阻传输线与环形开关构成1/4波长短路谐振器，它产生的宽谱微波振荡通过耦合器耦合到宽谱辐射天线上辐射，而耦合器由集中电容与分布电感组成，实现宽谱微波在频率调谐范围内以较为一致的耦合度提取微波能量。通过转动螺杆滑动安装在同轴谐振器内芯上的环形开关，达到改变谐振频率的目的。最后，将可调频宽谱辐射装置与输出电压为500 kV的Tesla变压器脉冲功率源联试，得到200～400 MHz宽谱微波辐射，辐射因子为95～130 kV,频谱百分比带宽为10%～30%。Abstract: A wideband radiation system with tunable center frequency is presented. The system is composed of a pulsed power source, a λ/4 coaxial transmission line oscillator, a ring switch, a coupler and a radiation antenna. The resonant frequency of the oscillator can be modified by sliding the ring switch on the inner transmission line. The coupler is designed with lumped capacitance and distributed inductance. The combined electric and magnetic dipoles antenna is designed in the range of 200 MHz to 400 MHz. And the wideband system is charged with a Tesla transformer whose output voltage is 500 kV on the 200 pF secondary capacitor. The range-normalized radiated E-field radiation factor is in the range of 95 kV to 130 kV and the FWHM of frequency spectrum is in the range of 10% to 30%.
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