一种新颖的开口环地面缺陷结构低通滤波器

A novel split-ring resonator defected ground structure lowpass filter

提出了一种新颖的具有陡峭边带和宽阻带的小型化低通滤波器。通过把开口谐振环地面缺陷结构(Split-Ring Resonator Defected Ground Structure,SRRDGS)与阶梯阻抗梳状谐振器结合,提高了滤波器的选择特性,同时获得了宽阻带。对所提出的结构作了加工并进行了实物测量,测试结果表明:滤波器选择特性大于160dB/GHz,在2.98GHz到8.2GHz范围内抑制度大于20dB,而占用面积仅为20×25mm2。

In this paper, a novel compact lowpass filer with sharp cutoff and widestopband is proposed. Combined split-ring resonator defected ground structure （SRR DGS）with step-impedance hairpin resonator, the selectivity of filter is improved significantly,and at the same time,wide stopband is achieved. The structure was fabricated and measured. The results show that the selectivity is better than 160 dB/GHz, and stopband attenuation level is more than 20 dB at the range of 2.98 to 8.2 GHz, but the occupied area is only 20×25 mm^2.