高功率全固态微波纳秒级脉冲源的设计与应用

The Design of High-power Nanosecond Pulser Based on Microwave PCB and Its Application

基于雪崩三极管雪崩效应,研制出了一种数千伏、纳秒级脉冲源。其为全固态微波PCB电路结构形式,利用数字电路产生可控重频触发信号,脉冲全底宽度400ps～2ns可调,重频1k～1000kHz可调,脉冲幅度360～2600V可调,峰值功率可达135kW。详细讲述了电路设计、器件选择以及重要电路结构。针对高压窄脉冲引起的特殊问题,提出了新颖的欠电荷充电法以及有效的梳状PCB(印刷电路板)结构。电路性能优良、稳定可靠,已投入超宽带目标探测实验系统应用。

Based on the avalanche effect, a kind of kilo-volt nanosecond pulsers has been designed, by using microwave PCB (printed circuit board). Its trigger signal with tunable repetition rate is given by a digital circuit. The full width of the pulse is tunable between 400ps and 2ns. Its voltage ranges from 360 to 2600V. And the peak power reaches 135kW. The design of these pulsers is discussed in detail, including the circuit design, the component selection, and the important physical layout. A novel method, called deficit-charge method, and a comb PCB layout are brought forward, aiming at solving the special problems caused by the high-power butultra-narrow pulser. Being used in the impulse radar test system, the circuit performance is excellent and stable.