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在传统微带线结构基础上利用阶跃阻抗并联短截线SISS(Step-Impedance Shunt Stubs)的带阻及慢波抑制特性,提出了一种新的基于SISS缺陷微带线结构S-DMS(SISS Defected Microstrip Structure),利用该结构设计制作了具有谐波抑制功能的双通带滤波器。采用HFSS进行仿真优化,在此基础上进行了实物加工,获得了通带中心频率为3.5 GHz,8.5 GHz,插入损耗分别为0.45 d B,2.7 d B,3 d B带宽分别是550 MHz,260 MHz,带外最大抑制小于-40 d B的实测结果,与仿真结果相当吻合。结果表明该双通带滤波器具有良好的谐波抑制能力、小带内衰减和宽且深的阻带特性。
Based on the traditional microstrip line structure, the strip resistance and slow-wave suppression characteristics of Step-Impedance Shunt Stubs (SISS) are proposed. Based on the SISS defect microstrip line structure S-DMS SISS Defected Microstrip Structure), the use of the structure designed and manufactured with harmonic suppression dual passband filter. The HFSS is used for the simulation optimization. Based on this, the center-of-pass band is obtained at 3.5 GHz and 8.5 GHz with insertion loss of 0.45 d B and 2.7 d B respectively. The bandwidth of 3 d B is 550 MHz and 260 respectively MHz, the maximum out-of-band suppression is less than -40 d B, which is in good agreement with the simulation results. The results show that the double-pass filter has good harmonic rejection, small-band attenuation and wide and deep stop-band characteristics.