A method for passive compression of a frequency-swept wave packet propagating through helically corrugated waveguide as the dispersive medium has been developed. By 3D fully electromagnetic particle-in-cell (PIC) code, the dispersion of a helically corrugated waveguide and the ways for improving the pulse compression ratio were investigated. The power compression ratio was 6. 65 higher than previous simulation results after optimization. The simulation study demonstrates that a better compression result can be obtained by optimizing the frequency sweep mode of input microwave pulse, using improved elliptical waveguide and extending the length of the helical tapers.%研究了一种基于螺旋波纹波导特殊色散特性对输入微波脉冲进行压缩的新方法.利用3维全电磁粒子模拟软件对X波段螺旋波纹波导进行了建模,模拟分析了该波导的特殊色散特性及提高功率增益的方法,并将已有模型脉冲压缩增益提高了6.65.模拟结果表明:通过优化输入微波的频率调制特性,可以获得更加符合被动式脉冲压缩所需要的调频形式；采用改进后的椭圆波导,可以得到更有利于被动式脉冲压缩的本征模式；通过延长渐变段长度,可以减少规则段和渐变段之间不均匀性造成的微波反射,从而实现更高的脉冲压缩增益.
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