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

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.