中文摘要：

提出了一种新的三工器有理模型的提取方法．该方法基于改进的柯西法，能够准确快速地求得三工器的有理模型，从而为三工器的计算机辅助设计、调试奠定了基础．利用文中提出的方法提取三工器的有理模型，所提取的有理模型响应与仿真响应吻合良好，证明了该方法的有效性．

英文摘要：

In recent years, a great deal of effort has been made on computer-aided design and tuning for microwave filters. However, there is little literature on the triplexer. The rational model of the triplexer is the key condition for computer-aided design and tuning. A new method based on the improved Cauchy method to extract the rational model of the triplexer is presented in this paper. A triplexer＇s rational model is extracted by the new method. The extracted rational model response agrees with the simulated response well, which shows the validity of the new method well.