提出一种新型的基片集成波导(substrate integrated waveguide, SIW)双通带滤波器. 该滤波器由2个不同中心频率、不同带宽的滤波器组成, 共用输入输出端口, 并采用矩形基片集成波导谐振腔结构, 通过在源与负载之间引入电耦合产生多个传输零点, 从而大大提高了滤波器的选择特性. 设计了一款工作在Ku波段的基片集成波导双通带滤波器, 两通带带宽分别为220和120 MHz. 利用Ansoft HFSS建立滤波器模型并进行全波仿真. 仿真结果表明, 该滤波器带外衰减陡峭, 结构紧凑. 实测结果与仿真结果吻合良好.
A novel dual-band filter based on the substrate integrated waveguide (SIW) is proposed. The filter is composed of two filters with different center frequencies and bandwidths. The two filters share the same input and output ports and use a rectangular substrate integrated waveguide cavity structure. Multi-transmission zeros have been obtained by electrical coupling between the source and the load, greatly improving the frequency-selective characteristics of the filter. A Ku-band substrate integrated waveguide dual-band filter is designed, with bandwidths of 220 and 120 MHz for the two pass-bands. A model with full-wave simulation is built with the Ansoft HFSS. Simulation results show that the filter has steep stopband attenuation and a compact structure. easurement results agree well with the simulation.
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