中文摘要：

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。

英文摘要：

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.