基于SIW的5G FR2频段窄带滤波器设计

Design of 5G FR2 Narrowband Filter Based on SIW

通过提取谐振腔谐振频率与腔体尺寸的关系、谐振腔耦合系数与耦合窗口尺寸关系、外部品质因数与输入输出结构的关系,采用耦合矩阵综合法设计了位于5G FR2频段、中心频率为25GHz、相对带宽为4%的基片集成波导窄带滤波器。滤波器通带内插入损耗小于1dB,回波损耗大于15dB,在25GHz±3GHz处的带外抑制大于35dB。该款滤波器总体性能良好,在5G FR2频段具备一定的应用前景。

By extracting the relationship between resonant frequency and cavity size,the relationship between coupling coefficient and coupling window size,and the relationship between external quality factor and input/output structure,a substrate integrated waveguide narrow-band filter with 5G FR2 band,25GHz center frequency and 4%relative bandwidth is designed by coupling matrix synthesis method.The insertion loss is less than 1dB and the return loss is more than 15dB in the passband of the filter,and the out-of-band rejection at 25GHz±3GHz is greater than 35dB.The overall performance of this filter is good,and it has a certain application prospect in the 5G FR2 band.