简易的超宽带亚周期微波脉冲产生方法

A Simple Ultra-wideband Sub-cycle Microwave Pulse Generation Method

提出了一种简易的超宽带亚周期微波脉冲电路设计方案,该方案利用阶跃恢复二极管的阶跃特性和肖特基二极管正向压降小且恢复时间短的特性,产生单极性、亚周期的微波脉冲,其电路结构简单、体积小巧、设计制造成本低廉、调试方便。实验结果表明,采用该方案设计的微波脉冲发生器可以产生半高宽为150 ps的超宽带亚周期微波脉冲,且脉冲拖尾现象很小。在脉冲的重复率为85 MHz时,产生的脉冲幅值最大,约为3.7 V,且波形拖尾现象最小。提出的设计适用于各类超宽带系统中的窄脉冲发生电路。

A highly simplified method of ultra-wideband （UWB） microwave pulse generation is presented, in which the specific recovery characteristics of the step recovery diode and the small voltage drop and short recovery time of the Schot- tky diode are utilized. Microwave pulse generators following this design generate unipolar sub-cycle pulses with circuits that take advantage of their simple structure, small size, low cost in designing and manufacturing, and ease of tuning. Experi- ments with such pulse generators are able to produce UWB sub-cycle microwave pulses of 150 ps width （ FWHM）, with weak ringing effects. The amplitude of the pulse is maximum when the repetition rate of the pulse train is set at 85 MHz, and the ringing effects are at minimum. The presented design is suitable in UWB systems of various purposes.