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本文介绍了一种基于缺陷地结构(DGS)的微带岔线型宽带带通滤波器的设计过程。此滤波器以四分之一波长的开路枝节型带通滤波器为原型进行设计和改进,引入了微带岔线和DGS结构,在增加通带带宽和阻带带宽的同时,使滤波器的带外谐波抑制和带内回波损耗得到了很大的改善。采用HFSS三维场仿真软件进行S参数的仿真,从仿真结果可以看出,所设计的带通滤波器中心频率为11.5GHz,其3dB相对带宽大于50%,带内插损小于0.3dB。此外,在1-6GHz的第一阻带内,滤波器的带外抑制大于20dB,最大抑制度为52dB;在15-24GHz的第二阻带内滤波器的带外抑制大于20dB,最大抑制度为46dB。整个滤波器尺寸仅为12mm×16mm。
This article describes the design of a microstrip branch-line wideband band-pass filter based on a defective structure (DGS). The filter is designed and improved by taking the quarter-wavelength open-stub band-pass filter as the prototype, introducing the microstrip branch line and the DGS structure. While increasing the passband bandwidth and the stopband bandwidth, the filter Out-of-band harmonic suppression and in-band return loss have been greatly improved. The simulation of S-parameter with HFSS three-dimensional field simulation software shows that the designed center frequency of the band-pass filter is 11.5GHz, the relative bandwidth of 3dB is more than 50% and the insertion loss of the band is less than 0.3dB. In addition, in the first stopband of 1-6GHz, the out-of-band rejection of the filter is greater than 20dB and the maximum rejection is 52dB; the out-of-band rejection of the filter within the second stopband of 15-24GHz is greater than 20dB and the maximum rejection Is 46dB. The entire filter size is only 12mm × 16mm.