频变耦合双工器的快速综合方法

A fast synthesis method of frequency variant coupled diplexer

为了解决频变耦合双工器的快速综合问题,提出了一种耦合矩阵优化综合方法.该方法分通道滤波器综合和优化两个阶段.首先应用推导的双工器特征多项式迭代求解出各通道滤波器的特征多项式,并应用耦合矩阵综合法计算出各通道滤波器的规范耦合矩阵.然后,根据指定的频变耦合拓扑结构,优化逼近规范耦合矩阵.最后,反归一化双工器的频变耦合矩阵得到最终设计参数.电路仿真结果与理论综合结果一致,表明了所提方法的正确性和有效性.该频变耦合双工器快速综合方法保持了较好的通带等波纹特性,且可以根据设计需要,任意指定各通道滤波器的频变耦合拓扑结构.

In order to solve the problem of fast synthesis of frequency variant coupled diplexers,a coupling matrix optimization synthesis method is proposed.The method is divided into two stages which are channel filter synthesis and optimization.Firstly,the characteristic polynomials of each channel filter are obtained iteratively by using the derived diplexer characteristic polynomials,and the normalized coupling matrices of each channel filter are calculated by using the coupling matrix synthesis method.Then,according to the specified coupling topology,the approximation of the canonical coupling matrix is optimized.Finally,the final design parameters are obtained through denormalization process.The simulation results agrees well with the theoretical synthesis results,which shows the correctness and effectiveness of the method.The proposed method shows that the passband of the diplexer maintains better equiripple characteristics and the coupling topology of each channel filter can be arbitrarily specified according to the specifications.