Wenfeng Xia’s research while affiliated with Northwest Institute Of Textile Science And Technology and other places

A novel compact 4-way ultra-wideband short pulse power divider (PD) based on coaxial waveguide is proposed in this paper. A nylon conical shell is inserted to replace the original transformer oil with an air block at the resonant place of PD to widen the working bandwidth. The junction of all inner conductors is smoothed to increase the fidelity and power capacity. The proposed PD is fabricated and tested. The results show that return loss is better than 12 dB from 191 MHz to 1.33 GHz. The amplitude loss is less than 10% and fidelity is more than 0.95 when input by impulse with full width at half maximum (FWHM) of 1.24 ns.

Parameters governing forward and reverse pumping of a device mechanism have an important influence on the cutoff and output characteristics of a drift-step-recovery diode (DSRD). Therefore, we analyzed the driving circuit for the DSRD that was used to adjust pumping parameter values. With multiple modules in parallel, a driving method exploiting narrow-pulse pumping is proposed in developing a high-repetition-frequency DSRD pulse generator. In experiments and simulations, one key factor affecting the working stability of this pulse generator operating at repetition frequencies in the megahertz range was found that helped in further optimizing the parameter settings of our 2 kV DSRD driving circuit. From this insight, a 2 kV–5 MHz all-solid-state high-repetition-frequency pulse generator based on the DSRD was developed.