A high-performance planar bandstop filter with extended upper passbands and improved pass-band return loss is proposed in this article. In this proposed bandstop filter, a novel three-section stepped-impedance structure is suggested to improve the pass-band reflections without affecting the desired band-stop and extended upper passband performances. The analysis and design considerations of this filter are provided while the proposed design approach is verified by full-wave simulation, microstrip implementation and accurate measurement of a typical fabricated filter operating at 1 GHz(fo). Compared to the conventional one, the proposed bandstop filter has main and obvious advantages of simple single-layer structure, perfect band-stop filtering performance (Suppression of better than 20 dB), excellent low/high pass-band return loss (Reflection of lower than -17 dB) in the extended upper passbands(Larger than 5.96 fo), and flat group-delay transmission (Variations of smaller than 0.22 ns).
展开▼
机译：本文提出了一种具有扩展的较高通带和改善的通带回波损耗的高性能平面带阻滤波器。在该拟议的带阻滤波器中，提出了一种新颖的三段式步进阻抗结构，以改善通带反射，而不影响所需的带阻和扩展的上通带性能。提供了该滤波器的分析和设计注意事项，同时通过全波仿真，微带实现和对工作在1 GHz（f o ）的典型制造滤波器的准确测量来验证所提出的设计方法。与传统的带阻滤波器相比，提出的带阻滤波器具有以下主要和明显的优势：简单的单层结构，完美的带阻滤波性能（抑制优于20 dB），出色的低/高通带回波损耗（反射率更低）。扩展的较高通带（大于5.96 f o ）具有小于-17 dB）和平坦的群时延传输（变化小于0.22 ns）。
展开▼
