星型结多工器综合

Synthesis of Star-Junction Multiplexers

  • 摘要: 提出了一种利用线性变换综合星型结多工器的方法。该方法基于线性变换综合出多工器的每个信道滤波器S参数对应的特征多项式,利用文献中已有的技术综合出多工器的N阶耦合矩阵。给出了多工器N阶耦合矩阵的构造方法,并推导了多工器S参数和群时延与N阶耦合矩阵的关系。为了验证该方法,给出了一个五工器及一个双工器的综合实例,其中双工器被进一步设计、加工与测试,测试结果与综合结果相吻合,进一步验证了该方法的准确性。

     

    Abstract: This paper presents a method for synthesizing coupled resonator multiplexers with a star-junction (an extra resonant junction in addition to the channel filters). A linear frequency transformation is proposed for the evaluation of the characteristic polynomials of the each channel filter composed of star-junction multiplexers, and then coupling matrix of overall multiplexers can be obtained by using the proposed linear frequency transformation and well-established method. The evaluation of group delay in the physical frequency f domain and S-parameters based on coupling matrix are derived. To illustrate the validation of the method, two examples, including 25-poles multiplexers and 7-poles diplexer, have been synthesized, and the 7-poles diplexer has been further designed, manufactured and measured. The measured resuts are in good agreement with the synthetic results, which further verify the accuracy of the proposed method.

     

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