中文摘要：

提出一种新型的折线形哑铃缺陷地结构（FDGS）。该FDGS对普通哑铃形DGS进行了改进，加入折线结构，从而在不增加蚀刻面积的情况下，大大增加其等效并联电容，获得较低的谐振频率。仿真结果显示，当某一特定尺寸的普通DGS的谐振频率位于4．7GHz时，同样大小的FDGS的谐振频率只有2，25GHz。制作了一个由三个相同的FDGS级联构成的带阻滤波器。结果表明：该带阻滤波器在1．8—2．78GHz之间，对信号的抑制从-26dB到-41dB。

英文摘要：

A novel folding dumb-bell defected ground structure （FDGS） was presented. The FDGS applied folding structure to the general dumb-bell FDGS in order to improve the performances. The equivalent capacitance of the FDGS was enhanced efficiently by the folding structure thus lower resonance frequency was achieved. Simulating results show the resonance frequency of the FDGS is 2.25 GHz, general dumb-bell DGS is 4,7 GHz with the same area. A band-reject filter built by three cascade FDGS and measured. The results show that the filter rejects signals from -26 to - 41 dB in 1.8 GHz - 2.78 GHz.