激振线超快脉冲产生机理和模型

 根据脉冲波前压缩原理，建立了激振线电路模型，推导出脉冲前沿压缩计算公式。激振线是一个近连续线的高阻抗微带传输线，反偏压的变容二极管以相同的小间隔加载到传输线，输入激励是一个下降沿的负脉冲。随着输入脉冲在传输线上的传播，变容二极管的电容随反偏压增大而减小，导致每个节点传播延迟的变化，从而压缩脉冲波前，产生前沿可达1 ps的超快脉冲。

Principle and model of ultrafast pulse generation based on shock line

According to the principle of pulse wavefront compression,the model of a shock line circuit is proposed and the computing formulas of wavefront compression are deduced.The shock line is a nearly continuous high-impedance transmission line loaded at the same small spacings by reverse-biased varactor diodes.With the propagation of the input negative-falltime pulse along the transmission line,the capacitance of varactor diodes is decreased by the increase of reverse bias voltage,and the variation in propagation delay at the nodes results in the compression of negative-going wavefronts during propagation.So the wavefront of ultrafast pulses generated by the shock line can be 1 ps.