一种基于DGS结构的新型双模双通带滤波器

提出了一种新颖的基于缺陷地结构(DGS)的双模双通带滤波器.该滤波器由印制板顶面的一个方形谐振单元和另一个巧妙嵌入在印制板底面DGS中的方形谐振单元并联构成,具有结构紧凑、易于加工的特点.每个谐振单元都具有双模单通带传输特性,可通过公共馈线同时激励实现双模双通带滤波.两个谐振单元的谐振频率相对可调,提高了设计上的灵活性.为减少辐射损耗并改善高频通带插损,使用准共面波导缺陷地结构对底面谐振单元进行了改进.最后,实验制作了两种双模双通带滤波器,测试结果与仿真结果吻合较好.

A Novel Dual Mode Dual Band Bandpass Filter Based on DGS

A novel dual-mode dual-band bandpass filter with simple defected ground structure(DGS) is proposed.A dual-mode dual-band bandpass filter is obtained by combining a microstrip square loop resonator on the top layer and another square loop constructed with DGS on the bottom layer,which achieve dual-mode single-band bandpass characteristic,respectively.Excited with common feed lines,the proposed filter is compact and easy fabrication.The resonance frequencies of these two loops are relatively independent so the design is flexible.Furthermore,an improved resonance unit with quasi CPW-DGS is presented to reduce the filter insertion loss by decreasing the radiation loss on the bottom layer.The design is confirmed by simulation and experiment results with good agreement.