宽阻带高选择性低通滤波器

A Compact Lowpass Filter with Wide Stopband and Good Selectivity

提出一种新型的阶梯结构周期性紧凑型微带谐振器单元(CMRC)低通滤波器.该结构通过在周期性CMRC单元结构两端引入阶梯结构,解决了传统的CMRC低通滤波器不能同时实现通带匹配和阻带抑制的弊病.实验结果表明:使用这种新型结构实现的低通滤波器,不仅能够同时实现通带匹配和阻带抑制,且具有结构紧凑、选择性好和宽阻带的优点.

A novel microstrip lowpass filter composed of a simple tapered periodical compact microstrip res- onant cell （CMRC） was proposed. In comparison to the conventional CMRC lowpss Silters, owing to the introduction of the tapered structure, the proposed structure has addressed simultaneously the problems of compactness, matching, selectivity, insertion loss, and the suppression of spurious frequency bands. Fi nally, a demonstration filter was designed, fabricated and tested to show the validity of the proposed structure.