In this article, a novel balanced-to-single-ended (BTSE) in-phase filtering power divider (FPD) based on circular patch resonator with good isolation and wide stopband is proposed. In this design, by carefully exploring the electric field distributions of the microstrip circular patch resonator modes, the common-mode can be well suppressed at the balanced ports, while in-phase output and good isolation can be attained at the single-ended ports. At the same time, filtering response is formed by coupling two circular patches through a circular aperture etched on the common ground. To verify the feasibility of this concept, a BTSE in-phase FPD operating at 4.2 GHz with 3-dB fractional bandwidth (FBW) of 19% is designed, manufactured, and tested. The consistency between the simulation results and the measurement results is good, indicating that this design has expected differential-mode response, nice common-mode suppression, significant single-ended output port isolation, as well as wide stopband.

中文翻译：

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基于圆形贴片谐振器的新型平衡到单端同相滤波功分器，具有良好的隔离和宽阻带

在本文中，提出了一种基于圆形贴片谐振器的具有良好隔离度和宽阻带的新型平衡单端 (BTSE) 同相滤波功率分配器 (FPD)。在本设计中，通过仔细探索微带圆形贴片谐振器模式的电场分布，可以在平衡端口很好地抑制共模，而在单端端口可以实现同相输出和良好的隔离。同时，通过在公共接地上蚀刻的圆形孔耦合两个圆形贴片，形成滤波响应。为了验证这个概念的可行性，设计、制造和测试了一个 BTSE 同相 FPD，工作频率为 4.2 GHz，3-dB 分数带宽 (FBW) 为 19%。仿真结果与测量结果一致性好，