提出了一种采用互补开口谐振环的缺陷地结构。根据结构的基本特性给出了等效电路图,设计了级联互补开口谐振环缺陷地结构且微带线加载对称性开路枝节的低通滤波器,通带性能良好,而且提高了带外抑制度。结果表明,通带内插入损耗小于1dB,带外抑制度优于40dB。 A defect structure using a complementary open-ended resonant ring is proposed. The equivalent circuit diagram is given according to the basic characteristics of the structure. A low-pass filter with cascaded open-ended resonant ring defect structure and microstrip line with symmetrical open-loop branches is designed. The passband performance is good and the out-of-band rejection . The results show that the insertion loss in the passband is less than 1dB and the out-of-band rejection is better than 40dB.