基于光子晶体单向传输波导,设计了一种三端口和两种四端口结构的通道下路滤波器.为取得100%的通道下路效率,运用实时耦合模理论对这三种结构进行了分析.理论分析表明该通道下路滤波器比利用光子晶体普通介质波导设计的通道下路滤波器具有更简单的结构,降低了器件制作难度.用有限元方法对滤波器结构进行了数值仿真分析,仿真计算结果表明所设计的三种结构具有超过90%的通道下路效率,与理论分析结果相符合. Based on the one-way photonic crystal waveguide, a three-port and two-port four-port channel filter was designed. To obtain 100% channel efficiency, the three structures were analyzed using real-time coupled mode theory The theoretical analysis shows that the channel filter has a simpler structure than the channel filter with photonic crystal waveguide, which reduces the difficulty of device fabrication.The finite element method is used to simulate the filter structure, The simulation results show that the designed three structures have more than 90% of the tunneling efficiency, which is consistent with the theoretical analysis.