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由于传统的威尔金森功分器需要通过多级传输线的级联来拓展其工作带宽,增加了电路设计的复杂度。因此本文提出了一种基于耦合三线的宽带功分器结构。通过在四分之一波长传输线的两端分别引入一节耦合三线,使功分器实现了宽带特性。采用三线耦合器与阻抗变换理论,对影响功分器工作带宽、输入输出端口匹配度和隔离度参数进行了理论分析,并设计制造了基于此结构的宽带功分器。测试结果表明该功分器具有很好的端口匹配、传输损耗和端口隔离特性。
Due to the traditional Wilkinson power divider needs to be cascaded through multilevel transmission lines to expand its working bandwidth, increasing the complexity of circuit design. Therefore, this paper presents a structure based on coupled three-wire broadband power divider. By introducing a three-wire coupling at each end of a quarter-wavelength transmission line, the power divider achieves broadband characteristics. Using the three-wire coupler and impedance transformation theory, theoretical analysis is made on the working bandwidth, input-output port matching degree and isolation parameter that affect the power divider, and a broadband power divider based on the structure is designed and manufactured. The test results show that the power divider has good port matching, transmission loss and port isolation.