双层基片集成波导双通带滤波器设计

Design of dual-passband filter with double-layer substrate integrated waveguide

根据频率变换法的双通带滤波器综合理论,采用矩形基片集成波导谐振腔作为基本谐振单元,通过谐振器之间直接耦合设计了一种双层结构的双通带基片集成波导滤波器,利用Ansoft HFSS建立滤波器模型并进行全波仿真。仿真结果表明,两个通带内回波损耗均大于20 dB,插入损耗小于0.5 dB,通带之间的阻带衰减特性良好,同时其尺寸压缩了约50%,较好地实现了滤波器的小型化,满足了工程需要的技术指标。

Based on the synthesis theory of dual-passband filters with frequency transformation method, a dual-passband substrate integrated waveguide （SIW） filter with a two-layer structure was designed by using a rectangular substrate integrated waveguide cavity as the basic resonant unit through direct coupling between the resonators. The proposed filter model with full-wave simulation was built in Ansoft HFSS. The simulation results show that both return losses of two pass-bands are higher than 20 dB, while the insertion loss is less than 0.5 dB with its good attenuation characteristic between two pass-bands. The dimensions are reduced almost 50%, where filter miniaturization is achieved. The filter meets the needs of engineering technical simultaneously.