This article encompasses the design of compact ultra-wideband (UWB) bandpass filter with low insertion loss and high selectivity using circular open-circuited stubs (COSs). Low insertion loss from two COSs and Multiple Mode Resonator (MMR) from three pairs of parallel-coupled lines are constituted to obtain the UWB band. The proposed filter has multiple resonant frequencies in the passband and two transmission zeros perceived at stop band/passband transition edges. It has a 3-dB fractional bandwidth of 110% and it covers the entire UWB band of 3.1–10.6 GHz. The measured passband insertion loss and group delay are 0.35 dB and 0.42 ns, respectively. Moreover, the presented filter is a single-layered structure since it is more comfortable to be integrated into a printed circuit board (PCB). The simulated and measured performance of the presented filter is in good agreement. The filter finds its application in low power handling single-layered PCBs, unlicensed short and medium distance communications.

本文包括使用圆形开路短截线 (COS) 设计具有低插入损耗和高选择性的紧凑型超宽带 (UWB) 带通滤波器。两个 COS 的低插入损耗和三对平行耦合线路的多模谐振器 (MMR) 构成以获得 UWB 频段。所提出的滤波器在通带中具有多个谐振频率，并且在阻带/通带过渡边缘处具有两个传输零点。它具有 110% 的 3 dB 小数带宽，覆盖 3.1–10.6 GHz 的整个 UWB 频带。测得的通带插入损耗和群延迟分别为 0.35 dB 和 0.42 ns。此外，所提出的滤波器是单层结构，因为它更容易集成到印刷电路板 (PCB) 中。所提供滤波器的模拟和测量性能非常吻合。该滤波器可用于低功率处理单层 PCB、免许可短距离和中距离通信。