G形DMS结构高选择性低通滤波器的分析与设计  

Design and analysis of a G-shaped DMS lowpass filter with high selectivity

作　　者：曹海林[1,2] 管伟[1] 何思佳[1] 杨力生[1,2] 

机构地区：[1]重庆大学飞行器测控与通信教育部重点实验室,重庆400044 [2]重庆大学通信与测控中心,重庆400044

出　　处：《高技术通讯》2013年第3期313-317,共5页Chinese High Technology Letters

基　　金：国家自然科学基金(61001089);重庆市科委自然科学基金(2010BB2243)资助项目

摘　　要：提出一种新颖的G形缺陷微带结构(DMS)微带线,以G形DMS为结构单元,设计并实现了一种具有高选择性和宽阻带特性的微带低通滤波器。与传统的DMS结构相比,G形DMS具有更低的谐振频率和更宽的阻带抑制。对设计的滤波器进行了测试,实测结果表明:该滤波器3dB截止频率为3.17GHz,频率选择性达189dB/GHz,同时在3.4GHz^10GHz阻带内抑制度大于25dB,有效地抑制了二次和三次谐波。该滤波器占用大小仅为26mm×15mm,实测结果与仿真良好吻合,表明了该DMS的有效性及实用性。A novel G-shaped defected microstrip structure （DMS） was proposed, and a microstrip superior selectivity and wide stopband was designed and fabri Compared with the conventional DMS, the proposed G-shaped cated using the proposed DMS DMS exhibits a lower resonant lowpass filter with the as its structrual units. frequency and a wider stopband. The lowpass filter was tested and measured, and the results showed that its 3dB cutoff frequency was 3.17GHz, the frequency selectivity was 189dB/GHz, and the harmonic suppression was over 25dB in the stopband of 3.4GHz - 10GHz, so the second and third harmonics can be effectively suppressed. The dimension of this filter is as small as 26mm - 15mm. The measured and simulated results are in good agreement, validating the effectiveness and practicality of the DMS.

关 键 词：缺陷微带结构(DMS) G形 微带低通滤波器 选择性 宽阻带 

分 类 号：TN713.4[电子电信—电路与系统]