基于分形理论的高低阻抗线低通滤波器  

Fractal-shaped Hi-Lo microstrip low-pass filters

作　　者：陈文灵[1] 王光明[1] 齐谊娜[2] 赵然[3] 梁建刚[1] 

机构地区：[1]空军工程大学导弹学院,陕西三原713800 [2]中国人民解放军95865部队,北京102218 [3]空军装备研究院科技部,北京100085

出　　处：《电波科学学报》2008年第3期506-509,共4页Chinese Journal of Radio Science

基　　金：国家高科技发展计划资助项目(2003AA005044)

摘　　要：提出了具有分形形状的高低阻抗线低通滤波器,仿真结果表明,与传统的高低阻抗线低通滤波器相比,其通带性能得到了巨大的改善,其良好的通带性能是由于分形形状微带线的宽度阶梯渐变减弱了其电流不连续性。为了验证所提出方法的有效性,设计、加工、测量了一组不同迭代次数的分形高低阻抗线低通滤波器,结果表明,高低阻抗线低通滤波器通带内反射损耗的最大值由-17.8 dB降低到-28.6dB,而其它性能并不因此而改变。Hi-Lo microstrip low-pass filters using Koch fractal shape are proposed in this paper. By constructing the low-impedance microstripline in Koch-shaped geometry, the passband performance of the Hi-Lo microstrip low-pass filter is enhanced greatly. The excellent passband performance is mainly from the gradual changes of the steps of the fractal-shaped microstripline, and weak current discontinuity is kept. A set of LPF prototype with different iteration orders are designed, fabricated and measured, the measurement results show the maximal sidelobe level of the passband return loss is reduced from -17.8dB to -28.6dB.

关 键 词：分形 高低阻抗线 低通滤波器 低反射损耗 

分 类 号：TN713[电子电信—电路与系统]