In view of the large design deviation caused by the current discontinuity of step impedance bandpass filter,the fractal thought was introduced.By changing the shape of step impedance resonance,the SIR bandpass filter was made as close as possible to the actual performance of the design goals based on the 3 GHZ step imped-ance based on fractal bandpass filter design and simulation.Simulation results showed that the optimized SIR bandpass filter performance within the passband fully met the actual requirements,but also ensured the harmon-ic suppression,besides,it could reduce the processing difficulty.%针对阶跃阻抗带通滤波器由于微带线电流出现不连续性问题，而造成使用经典设计方法设计的滤波器出现较大设计偏差问题，引入分形思想，通过改变阶跃阻抗谐振器形状的方法，使 SIR带通滤波器的实际性能尽可能接近设计目标，通过对3 GHz基于分形技术的阶跃阻抗带通滤波器进行设计仿真表明，经分形技术优化后的SIR带通滤波器不仅通带内性能完全符合实际要求，而且保证了对谐波的抑制，同时还能降低加工难度。
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