一种新型双通带滤波器的设计

Design of a Novel Dual-Band Bandpass Filter

本文提出了一种新型的双通带滤波器,采用金属孔接地的等边三角形谐振器,可以产生两种不同的谐振峰值,两个中心频率为2.4 GHZ和5.8 GHZ,相应的3 dB带宽分别是230 MHZ和920 MHZ。通过引入接地结构和短截线,改善了频率选择性,滚降最大可以达到109 dB/GHz,在阻带的衰减达到60 dB。该滤波器仿真结果良好。

A novel equilateral triangular resonator with a metalized via-hole connecting to ground plane is presented,which can produce two different resonant peaks.Two center frequencies of the proposed dual-bandpass filter are2.4 and 5.8 GHz,and the 3dB bandwidths are 230 and 920MHz,respectively.By introducing the technology of defected ground structure(DGS)and stub,the proposed dual-band bandpass filter has great improvement in frequency selectivity,the maximum sharp skirt can reach to 109dB/GHz,and in stopband the attenuation approaches to 60dB.The simulation results of the filter are good.