This letter presents a novel impedance transformer that can transform two unequal frequency‐dependent complex loads (FDCLs) to a resistive load at two diverse bands. The proposed transformer contains four sections of transmission lines and one shunt stub. The design parameters of the transformer are obtained from the analytical formulas. The feasibility analysis of the transformer is discussed and an example based on microstrip technology is implemented and measured for verification. The good agreement between the simulated results and measured results proves the validity of the proposed configuration and design method. Compared with the reported works, the transformer not only features single shunt stub and shorter total electrical length at transmission direction, but also provides simpler analytic design equations and less likely to use the very high‐ or low‐impedance transmission lines.

中文翻译：

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具有单并联支路的双频带阻抗变压器，用于复杂的阻抗负载

这封信提出了一种新颖的阻抗变压器，可以将两个不相等的频率相关复数负载（FDCL）转换为两个不同频带上的阻性负载。拟议的变压器包含四段传输线和一个并联支线。变压器的设计参数由解析公式得出。讨论了变压器的可行性分析，并以微带技术为例，进行了实测和验证。仿真结果与实测结果吻合良好，证明了所提出的配置与设计方法的有效性。与报道的作品相比，该变压器不仅具有单并联支路，而且在传输方向上的总电气长度更短，