一种新的三工器设计方法

提出了一种基于多项式综合的新的三工器设计方法．根据各个通道滤波器的指标，得到滤波器响应的特征多项式．推导出三工器响应特征多项式的计算公式，并计算得到其特征多项式．这些多项式中包含了各个通道滤波器的相互影响信息．对三工器的反射多项式的根进行重新排布，可以使三工器在3个频段均呈现出等波纹特性．利用这些根，可以方便计算出最终的滤波器特征多项式．最后，对这些滤波器多项式应用经典的综合方法，就可以得到各个滤波器的耦合系数和外部Q值等参数．为了验证理论的正确性，将理论计算的数据，代入到电路仿真软件MWO的模型中进行仿真，仿真结果与设计指标吻合得很好．

Design method for the triplexer based on polynomial synthesis

This paper presents a new design technique for the triplexer based on characteristic polynomial synthesis.According to the specifications of each filter,characteristic polynomials of each filter are computed.The characteristic polynomials of the triplexer is then deduced and computed.These polynomials include information on the mutual effects between filters.Roots of the reflective characteristic polynomial are rearranged to maintain the equal ripple characteristic of the triplexer.By making use of these ro...