ABSTRACT This work presents two wideband coplanar-waveguide bandpass filters using open-circuited stubs (Design 1) and short-circuited stubs (Design 2), respectively. The electrical lengths of stubs were accurately determined by a phase comparison method. In Design 1, a spurious resonance was found at the high band edge of the passband. The problem was solved by introducing oblique air bridges to ruin the undesired resonance path for the suppression of the spurious resonance. Design 1 achieves bandwidth of 38.1% and low insertion loss of 0.7 dB. Another CPW filter, Design 2, was constructed with short-circuited stubs for compact size, which can achieve a very wide bandwidth of 70.8% and insertion loss of 0.9 dB.

中文翻译：

---

使用相位比较法和斜空桥设计宽带CPW带通滤波器

摘要 这项工作提出了两个宽带共面波导带通滤波器，分别使用开路短截线（设计 1）和短路短截线（设计 2）。短截线的电气长度是通过相位比较方法准确确定的。在设计 1 中，在通带的高频带边缘发现了寄生谐振。该问题通过引入倾斜的空气桥来破坏不需要的谐振路径以抑制杂散谐振来解决。设计 1 实现了 38.1% 的带宽和 0.7 dB 的低插入损耗。另一种 CPW 滤波器，设计 2，采用短路短截线构造，​​尺寸紧凑，可实现 70.8% 的非常宽的带宽和 0.9 dB 的插入损耗。