This paper presents a novel ultracompact narrow bandpass filter with high selectivity. The proposed filter is composed of cascading two basic cells. Each cell is basically a microstrip line loaded with a quasiplanar resonator and series gaps which can be fabricated using a standard multilayer printed circuit board technology. The structure is analyzed through an equivalent circuit and full-wave simulations. The simulation results are compared with experimental measurements demonstrating a good agreement between them. The measurement indicates that the realized bandpass filter at the center frequency of 1 GHz has a fractional bandwidth of 2.2%. Most importantly, in comparison with other similar recent works, it is shown that the proposed filter has the smallest size.

中文翻译：

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使用双负拟平面细胞的新型超紧凑窄带通微带滤波器

本文提出了一种具有高选择性的新型超紧凑窄带通滤波器。所提出的滤波器由级联两个基本单元组成。每个单元基本上是一条微带线，上面装有准平面谐振器和串联间隙，可以使用标准的多层印刷电路板技术制造。通过等效电路和全波仿真对结构进行分析。将模拟结果与实验测量结果进行比较，证明它们之间具有良好的一致性。测量表明，在1 GHz中心频率处实现的带通滤波器具有2.2％的分数带宽。最重要的是，与其他类似的近期工作相比，表明所提出的滤波器具有最小的尺寸。