Abstract

The development results of new waveguide planar filters with high selectivity are presented in this article. New bandpass filters (BPF) based on folded metal structures have poles of attenuation characteristics near the filter passband and they are focused on selectivity improvement. Filters are designed in a fully symmetrical topology, which improves performance reproducibility, manufacturability, and reduces manufacturing cost. The proposed BPFs on metal-dielectric structures are based on stepped impedance resonators (SIR) with preservation of the “in-line” topology. They allow us to expand the stopband to the boundaries of the waveguide operating passband and significantly increase the insertion loss level in comparison with the original filters based on homogeneous resonators. In this case, the typical filter linear dimension reduction is about of 30%. Also we show, that the proposed filters form the attenuation characteristic pole far from the filter passband, which makes it possible to achieve a high rejection level with a small number of resonators. The measured characteristics of the filter prototypes are in good agreement with simulation results.

中文翻译：

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波导平面电子平面滤波器的阻带特性改善

摘要

本文介绍了具有高选择性的新型波导平面滤波器的开发结果。基于折叠金属结构的新型带通滤波器（BPF）在滤波器通带附近具有衰减特性极点，它们致力于提高选择性。滤波器以完全对称的拓扑结构设计，从而提高了性能可重复性，可制造性并降低了制造成本。在金属电介质结构上提出的BPF基于步进阻抗谐振器（SIR），并保留了“在线”拓扑。与基于同质谐振器的原始滤波器相比，它们使我们能够将阻带扩展到波导工作通带的边界，并显着提高插入损耗水平。在这种情况下，典型的过滤器线性尺寸减小约30％。我们还表明，所提出的滤波器形成了远离滤波器通带的衰减特性极点，这使得可以使用少量谐振器实现高抑制水平。滤波器原型的测量特性与仿真结果非常吻合。