Two novel wideband bandpass filtering balun power dividers using modified Schiffman phase shifter are proposed in this article. Two types of wideband Wilkinson power dividers are adopted, respectively, in the two structures for wide passband. The Schiffman phase shifters are used in the structures for realizing 180° phase shift between output ports modified by connecting each of them with a short‐ended stub for weak coupling coefficient. In addition, two transmission zeros are realized by an open‐ended stub connected in parallel at the input port to realize the filtering characteristic. To verify the proposed structures, two wideband bandpass filtering balun power dividers (εr = 3.66，h = 0.762 mm, tanδ = 0.004) centering at 2GHz are designed and fabricated. The simulated and measured results are discussed.

中文翻译：

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使用改进的Schiffman移相器的宽带滤波巴伦功率分配器

本文提出了两种使用改进的希夫曼移相器的宽带带通滤波巴伦功率分配器。在两种用于宽通带的结构中，分别采用了两种类型的宽带威尔金森功率分配器。Schiffman移相器用于结构中，以实现输出端口之间180°的相移，该输出端口通过将每个端口与一个短端短截线连接以修正弱耦合系数而进行修改。此外，通过在输入端口处并联连接的开放式短截线实现两个传输零，以实现滤波特性。为了验证所提出的结构中，两个宽带带通滤波平衡-不平衡变换器的功率分配器（ε R = 3.66，H ^ =0.762毫米，tanδ的= 0.004）以2GHz为中心进行设计和制造。讨论了仿真和测量结果。