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 this issue, this paper presents a dual-dimensional control method based on delayed differential feeding.
Methods By configuring a time delay, differential pulses with opposite polarities, equal amplitude and pulse width were adopted to excite the radiator synchronously or with a time shift. A pulse radiator and ±6.4 kV pulse sources were manufactured for verification. Comparative experiments among single-channel feeding, power-combining feeding and the proposed scheme were 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 increases by 100%.
Conclusions This method avoids energy loss and reflection in power synthesis, and reduces 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.