一种使用开路并联线的改进型螺旋微带谐振单元

摘要

提出了一种改进型螺旋微带谐振单元(SCMRC)的结构.该改进型螺旋微带谐振单元具有微带并联开路线,在低频通带内通过设计达到50Ω的端口阻抗.同时,并联的微带开路线在SCMRC结构的禁带中谐振,来实现更强的慢波效应和更宽的禁带.实际设计、制作和测试了该改进型螺旋微带谐振单元,该滤波器在低频通带内具有低插入损耗、改善的回波损耗,以及在较小面积下的宽禁带.%An improved spiral compact microstrip resonant cell (SCMRC) was presented. The improved SCMRC with microstrip open stub lines was designed to achieve 50Ω port impedance in the low-pass band. Also, the microstrip open stub liens are resonant at the stop-band of the SCMRC resulting in the stronger slow-wave effect and wider stop-band. The proposed improved SCMRC was designed, fabricated, and measured. It shows the lower insertion loss, improved return loss in the low-pass band, and wider stop-band with compact size.