一种新型DGS微带带通滤波器的设计

Compact Stub Type Microstrip Bandpass Filter Using Defected Ground Plane

通常缺陷接地平面结构(DGS)只有一个响应频段,然而,在这里我们介绍一种DGS电路,并研制了中心工作频率为4.2GHZ的3阶微带带通滤波器(BPF)。这种BPF的带宽为38%,带内插入损失为0.6dB,在12GHZ处的衰减大于25dB。

Usually a defected ground plane structure （DGS） provides only a band-reject response. However,in this work we introduce a simple band-accept circuit element in the DGS and developeda microstrip stub type compact 3-pole bandpass filter （BPF） at 4.2 GHz. The BPF has bandwidth 38% and insertion loss 0.6 dB respectively. It has better than 25 dB rejection in the stopband up to 12 GHz.