基于延迟差分馈电的时域脉冲电场幅-频双维调控方法

Dual-dimensional amplitude-frequency enhancement of time-domain pulsed electric fields based on delayed differential feeding method

  • 摘要: 基于瞬态电磁脉冲发生器的高能量输出需求,提出了一种基于延迟差分馈电的时域脉冲电场幅度-重复频率的双维调控方法。通过设置时间延迟,一组极性相反,幅度、脉宽相等的时域差分脉冲被用于同时或分时激励脉冲辐射器,实现时域脉冲辐射器的等效输入能量和重复频率的双维增强,进而提升时域脉冲辐射器的时域辐射性能。一个基于标准对拓Vivaldi时域天线设计的脉冲辐射器和一组±6.4 kV的时域差分脉冲源被设计加工,用于验证该方法的可行性。通过对单通道馈电、功率合成技术馈电和时域延迟差分馈电进行对照实验,所提出的馈电调控方法相比单通道馈电和功率合成技术馈电,实现109.6%和48.3%的辐射电场强度增强和100%的重复频率提升。所提出的延迟差分馈电调控方法避免了功率合成技术中宽带合路器带来的能量损耗和反射问题,减少了场合成技术、多端口馈电技术中多个小单元之间位置间距和耦合关系的设计复杂度,实现了时域脉冲电场幅度和重复频率的双维调控,为增强瞬态电磁脉冲发生器性能提供了一种简单的馈电方法。

     

    Abstract:
    Background Transient electromagnetic pulse generators are widely used in ground penetrating radar and through-wall radar.
    Purpose Improving the output energy efficiency and repetition frequency of pulse radiators has become an urgent problem to be solved. To solve these issues, this paper proposes a dual-dimensional control methodology based on delayed differential feeding.
    Methods By configuring time delay, differential pulses with opposite polarities, equal amplitude and pulse width are adopted to excite the radiator synchronously or in a time-shifted manner. A pulse radiator and ±6.4 kV pulse sources are manufactured for verification. Comparative experiments among single-channel feeding, power-combining feeding and the proposed scheme are conducted.
    Results Measurement results show that the radiated electric field strength increases by 109.6% against single-pulse feeding and 48.3% against power-combining feeding, and the repetition frequency is improved by 100%.
    Conclusions This method avoids energy loss and reflection in power synthesis, and relieves design challenges from element spacing and mutual coupling in field synthesis. It realizes independent control over pulse amplitude and repetition frequency, and provides a simple and effective feeding solution to enhance the performance of transient electromagnetic pulse generators.

     

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