In this letter, a wideband balanced bandpass filter (BPF) with the feature of common-mode (CM) noise absorption (CMNA) is presented. The whole circuit is realized with the double-sided parallel-strip line (DSPSL). The resistors placed at the two sides of the circuit work only when the CM signals are excited. The even/odd-mode equivalent circuits of the proposed BPF are analyzed and a systematic design method is introduced to guide the design. Finally, a practical BPF with CMNA is designed and fabricated. A good performance and the consistency between the simulation and the measured results verify the design theory.

中文翻译：

---

使用双面平行带状线的具有共模噪声吸收功能的宽带平衡带通滤波器

在这封信中，介绍了一种具有共模 (CM) 噪声吸收 (CMNA) 特性的宽带平衡带通滤波器 (BPF)。整个电路采用双面平行带状线（DSPSL）实现。放置在电路两侧的电阻只有在共模信号被激发时才工作。分析了所提出的 BPF 的偶/奇模等效电路，并引入了系统的设计方法来指导设计。最后，设计并制造了具有 CMNA 的实用 BPF。良好的性能以及仿真与实测结果的一致性验证了设计理论。